CN108386216A - Check valve is replaced in double cross - Google Patents

Abstract

The invention discloses a kind of double crosses to replace check valve, including valve body, the first core assembly and the second core assembly, it is the first swivel nut being threadedly coupled that the first core assembly, which includes with valve body, is the first valve pocket being threadedly coupled, the first one-way valve seat, the first valve seat and the first spool inside the first valve pocket with the first swivel nut；It is the second swivel nut being threadedly coupled that second core assembly, which includes with valve body, is the second valve pocket being threadedly coupled, the second one-way valve seat, the second valve seat and the second spool inside the second valve pocket with the second swivel nut.Check valve is replaced in the double cross of the present invention, valve seat, valve pocket and swivel nut link into an integrated entity, form two core assemblies of plug-in, two core assemblies are structure as a whole, so that entire double cross is higher for the level of integrated system of check valve, convenient for double cross for check valve assembly and follow-up maintenance, that is, install it is simple, easy to maintenance, directly by replace cartridge valve core assembly can repair the double cross replace check valve.

Description

Check valve is replaced in double cross

Technical field

The invention belongs to coal mine fully-mechanized mining hydraulic supports, specifically, the present invention relates to a kind of double crosses to replace check valve.

Background technology

Double cross is one of widely used Hydraulic Elements in hydraulic bracket control system for check valve, in hydraulic support Hydraulic system in, double cross for check valve be mainly used for the jack in hydraulic system release and withdrawal control and realize thousand The differential action on jin top.Existing double cross for check valve part it is more, can cause to assemble it is cumbersome, and can cause repair not side Just, service life is low, is easy to influence production.

Invention content

The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention provides a kind of pair Alternately check valve, it is therefore an objective to improve integrated level, convenient for assembly and maintenance.

To achieve the goals above, the technical solution that the present invention takes is：Check valve, including valve body, the first valve are replaced in double cross Core assembly and the second core assembly, the axis perpendicular of the axis of the first core assembly and the second core assembly, first valve It is the first swivel nut being threadedly coupled that core assembly, which includes with valve body, with the first swivel nut is the first valve pocket being threadedly coupled and the first valve It covers the first one-way valve seat connected, the first valve seat inside the first swivel nut and is set inside the first valve pocket and to be removable The first spool set, the first spool is between the first one-way valve seat and the first valve seat；Second core assembly includes and valve Body is the second swivel nut being threadedly coupled, with the second swivel nut is the second valve pocket being threadedly coupled, second connect with the second valve pocket list The second valve seat to valve seat, inside the second swivel nut and the second spool inside the second valve pocket and to be movably arranged, Second spool is between the second one-way valve seat and the second valve seat.

First valve pocket is sheathed on first one-way valve seat and the first one-way valve seat passes through the first screw and first Valve pocket connects, and the first valve pocket has the internal thread hole for allowing the first screw to be inserted into, and the first one-way valve seat, which has, allows the first screw to be inserted into The first lock groove.

First lock groove is the annular groove that entirely circumferentially extends of periphery upper edge in first one-way valve seat, It is to be uniformly distributed circumferentially that multiple and multiple first screws, which are arranged, in first screw.

First one-way valve seat is connect with one end of first valve pocket, and first valve seat is another with the first valve pocket It holds end face contact and the first valve seat is clamped by the first valve pocket and first swivel nut, first spool has for described the The primary sealing area and secondary sealing area for being contacted with first valve seat of one one-way valve seat contact, primary sealing area and the Two sealing surfaces are circular conical surface.

First valve pocket have allow liquid by the first liquid pass hole and the second liquid pass hole, the valve body, which has, allows liquid By third working hole, third working hole is connected to the first liquid pass hole and the second liquid pass hole；In first core assembly In axial direction, between second liquid pass hole and first one-way valve seat, the second liquid pass hole is located at first liquid pass hole Between first liquid pass hole and first valve seat, the distance between the first liquid pass hole and the second liquid pass hole be less than the first liquid pass hole with The distance between first one-way valve seat, the distance between the first liquid pass hole and the second liquid pass hole are less than the second liquid pass hole and the first valve The distance between seat.

Second valve pocket is sheathed on second one-way valve seat and the second one-way valve seat passes through the second screw and second Valve pocket connects, and the second valve pocket has the internal thread hole for allowing the second screw to be inserted into, and the second one-way valve seat, which has, allows the second screw to be inserted into The second lock groove.

Second lock groove is the annular groove that entirely circumferentially extends of periphery upper edge in second one-way valve seat, It is to be uniformly distributed circumferentially that multiple and multiple second screws, which are arranged, in second screw.

Second one-way valve seat is connect with one end of second valve pocket, and second valve seat is another with the second valve pocket It holds end face contact and the second valve seat is clamped by the second valve pocket and second swivel nut, second spool has for described the The third sealing surface and the 4th sealing surface for being contacted with second valve seat of two one-way valve seats contact, third sealing surface and the Four sealing surfaces are circular conical surface.

Second valve pocket have allow liquid by third liquid pass hole and the 4th liquid pass hole, the valve body, which has, allows liquid Second drainage hole of outflow, the second drainage hole are connected to third liquid pass hole and the 4th liquid pass hole.

In the axial direction of second core assembly, the third liquid pass hole is located at the 4th liquid pass hole and described second Between one-way valve seat, the 4th liquid pass hole is located between third liquid pass hole and second valve seat, and third liquid pass hole and the 4th crosses liquid The distance between hole is less than the distance between third liquid pass hole and the second one-way valve seat, between third liquid pass hole and the 4th liquid pass hole Distance be less than the distance between the 4th liquid pass hole and second valve seat.

The double cross of the present invention replaces check valve, valve seat, valve pocket and swivel nut to link into an integrated entity, and forms two spool groups of plug-in Part, two core assemblies are structure as a whole so that entire double cross is higher for the level of integrated system of check valve, convenient for double cross for unidirectional The assembly of valve and follow-up maintenance, that is, install it is simple, easy to maintenance, directly by replace cartridge valve core assembly can repair this pair Alternately check valve.

Description of the drawings

This specification includes the following drawings, and shown content is respectively：

Fig. 1 is the sectional view that check valve is replaced in double cross of the present invention；

Fig. 2 is the sectional view of the first core assembly；

Fig. 3 is the sectional view of valve body；

Fig. 4 is the sectional view of the first valve pocket；

Fig. 5 is the sectional view of the first spool；

Fig. 6 is the sectional view of the first swivel nut；

Fig. 7 is the sectional view of the second core assembly；

Fig. 8 is the sectional view of the second valve pocket；

Fig. 9 is the sectional view of the second spool；

Figure 10 is the sectional view of the second swivel nut；

Figure 11 is the principle schematic that check valve is replaced in double cross of the present invention；

In figure label for：1, the first screw；2, valve body；201, the first working hole；202, the first valve chamber；203, third works Mouthful；204, the second valve chamber；205, the 5th working hole；3, the first one-way valve seat；4, the first valve seat；5, the first valve pocket；501, first Interconnecting piece；502, the first guide part；503, the first liquid pass hole；504, the second liquid pass hole；505, internal thread hole；6, the first swivel nut； 601, second connecting portion；602, third interconnecting piece；603, the second working hole；604, limiting section；7, the first spool；701, first is close Cover；702, secondary sealing area；8, resetting spring；9, the second one-way valve seat；10, the second valve seat；11, the second valve pocket；1101, Four interconnecting pieces；1102, the second guide part；1103, third liquid pass hole；1104, the 4th liquid pass hole；1105, internal thread hole；12, Two swivel nuts；1201, the 5th interconnecting piece；1202, the 6th interconnecting piece；1203, the 4th working hole；13, the second spool；1301, third Sealing surface；1302, the 4th sealing surface；14, the second screw.

Specific implementation mode

Below against attached drawing, by the description of the embodiment, making to the specific implementation mode of the present invention further details of Explanation, it is therefore an objective to those skilled in the art be helped to have more complete, accurate and deep reason to the design of the present invention, technical solution Solution, and contribute to its implementation.

As shown in Figures 1 to 6, the present invention provides a kind of double cross replace check valve, including valve body 2, the first core assembly and Second core assembly, the axis perpendicular of the axis of the first core assembly and the second core assembly.First core assembly include with Valve body 2 is the first swivel nut 6 being threadedly coupled, is the first valve pocket 5 being threadedly coupled with the first swivel nut 6, is connect with the first valve pocket 5 First one-way valve seat 3, the resetting spring 8 inside the first valve pocket 5, the first valve seat 4 inside the first swivel nut 6 and it is located at The first spool 7 inside first valve pocket 5 and to be movably arranged, the first spool 7 are located at the first one-way valve seat 3 and the first valve seat 4 Between.It is the second swivel nut 12 being threadedly coupled that second core assembly, which includes with valve body 2, is be threadedly coupled with the second swivel nut 12 Two valve pockets 11, the second one-way valve seat 9 being connect with the second valve pocket 11, the second valve seat 10 inside the second swivel nut 12 and it is located at The second spool inside second valve pocket 11 and to be movably arranged, the second spool are located at the second one-way valve seat 9 and the second valve seat 10 Between.

Specifically, as depicted in figs. 1 and 2, the first valve pocket 5, the first spool 7, the first one-way valve seat 3, the first valve seat 4, Resetting spring 8 and the first swivel nut 6 constitute the first core assembly of plug-in, and the first core assembly is structure as a whole.First valve Core 7 and resetting spring 8 are located at the inside of the first valve pocket 5, and one end of the first valve pocket 5 is fixedly connected with the first one-way valve seat 3, and first The other end of valve pocket 5 is fixedly connected with the first swivel nut 6, and resetting spring 8 is clipped between the first spool 7 and the first swivel nut 6, and first is single It is positioned opposite, the first valve pocket 5, the first spool 7, the first one-way valve seat 3, the first valve seat 4 and the to valve seat 3 and the first valve seat 4 One swivel nut 6 is coaxial arrangement.Resetting spring 8 is used to make it move axially towards at the first one-way valve seat 3 application of first spool 7 Dynamic active force, to realize the reset of the first spool 7.Double cross has first medium channel and second medium channel for check valve, First spool 7 is for optionally making first medium channel and second medium channel in the conduction state.First spool 7 and One one-way valve seat 3 matches, the break-make for controlling first medium channel.First spool 7 is arranged to exist with the first one-way valve seat 3 It is switched between contact condition and discrete state, when the first spool 7 and the first one-way valve seat 3 are in contact condition, first Medium channel is interrupted, and second medium channel is switched on, and liquid cannot be flowed through first medium channel, and liquid can at this time It is flowed through second medium channel；When the first spool 7 and the first one-way valve seat 3 are in discrete state, first medium channel It is switched on, second medium channel is interrupted, and double cross is in open state for check valve, and liquid can be flowed through first medium channel It is dynamic.First spool 7 is matched with the first valve seat 4, the break-make for controlling second medium channel.First spool 7 is arranged to and the One valve seat 4 switches between contact condition and discrete state, when the first spool 7 and the first valve seat 4 are in contact condition, Second medium channel is interrupted, and first medium channel is switched on, and liquid cannot be flowed through second medium channel, and liquid passes through It is flowed in first medium channel；When the first spool 7 and the first valve seat 4 are in discrete state, second medium channel is switched on, First medium channel is interrupted, and liquid can be flowed through second medium channel.

As shown in Figure 1 and Figure 7, the second valve pocket 11, the second spool, the second one-way valve seat 9, the second valve seat 10 and the second swivel nut 12 constitute the second core assembly (the second core assembly does not have resetting spring) of plug-in, and the second core assembly is integrated knot Structure.Second spool is located at the inside of the second valve pocket 11, and one end of the second valve pocket 11 is fixedly connected with the second one-way valve seat 9, and second The other end of valve pocket 11 is fixedly connected with the second swivel nut 12, and the second one-way valve seat 9 and the second valve seat 10 are positioned opposite, the second valve It is coaxial arrangement, the axis of the second swivel nut 12 to cover the 11, second spool, the second one-way valve seat 9, the second valve seat 10 and the second swivel nut 12 With the axis perpendicular of the first swivel nut.Double cross for check valve there is third medium channel and the 4th medium channel, the second spool to use In optionally making third medium channel and the 4th medium channel in the conduction state.Second spool and the second one-way valve seat 9 It matches, the break-make for controlling third medium channel.Second spool be arranged to the second one-way valve seat 9 contact condition and point It is switched between state, when the second spool and the second one-way valve seat 9 are in contact condition, third medium channel is by Disconnected, the 4th medium channel is switched on, and liquid cannot be flowed through third medium channel, and liquid can be logical through the 4th medium at this time It is flowed in road；When the second spool and the second one-way valve seat 9 are in discrete state, third medium channel is switched on and third is situated between Matter channel is connected to first medium channel, and the 4th medium channel is interrupted, and double cross is in open state for check valve, and liquid can be through Third medium channel and first medium channel are flowed.Second spool is matched with the second valve seat 10, is situated between for controlling the 4th The break-make in matter channel.Second spool is arranged to switch between contact condition and discrete state with the second valve seat 10, when When two spools and the second valve seat 10 are in contact condition, the 4th medium channel is interrupted, and third medium channel is switched on, and liquid is not It can be flowed through the 4th medium channel, and liquid flows to first medium channel through third medium channel；When the second spool and When two valve seats 10 are in discrete state, the 4th medium channel is switched on, and third medium channel is interrupted, and liquid can be through the 4th medium It is flowed in channel.

As shown in figures 1 and 3, the inside of valve body 2 have accommodate the first core assembly the first valve chamber, the first valve chamber be The circular cavity that the first end end face of valve body 2 is formed initially towards the internal stretch of valve body 2, the first swivel nut 6 are inserted into the of valve body 2 In one valve chamber and the first swivel nut 6 is threadedly coupled with valve body 2, realizes fixation of first core assembly on valve body 2, and first is unidirectional Valve seat 3 and the first valve pocket 5 also are located in the first valve chamber of valve body 2.The inside tool of valve body 2 there are one the first working hole 201 (namely A mouths in Fig. 1 and Figure 11) and a third working hole 203 (namely E mouths in Fig. 1), valve body 2 is at the first working hole 201 It is attached by oil pipe and reversal valve, oil connection is inserted into the first working hole 201, the first working hole 201 and third work Mouthfuls 203 be the axis perpendicular of circular hole and the axis and third working hole 203 of the first working hole 201, the first working hole 201 and First valve chamber is coaxial arrangement, and the first working hole 201 is the internal stretch initially towards valve body 2 from the second end end face of valve body 2 And the circular hole at the first valve chamber is extended to, the diameter of the first working hole 201 is less than the diameter of the first valve chamber, the first end of valve body 2 It is both ends opposite on valve body 2 with second end, the end face of first end and the end face of second end are parallel.Third working hole 203 is Initially towards the internal stretch of valve body 2 and the circular hole from the first valve chamber, third working hole are extended to from the third end end face of valve body 2 203 be located at the first valve chamber radially and third working hole 203 is connected to the first valve chamber, the end face at the third end of valve body 2 and the The end face of one end and the end face of second end is perpendicular and the end face at third end be located at first end end face and second end end face it Between, the liquid in the first valve chamber flows out valve body 2 through third working hole 203.Valve body 2 is to pass through oil pipe at third working hole 203 It is attached with the rodless cavity of jack, oil connection is inserted into third working hole 203.Jack is a kind of single-piston rod hydraulic pressure Cylinder, jack can be extended and be shunk.

As shown in Figure 1, Figure 2 and Figure 4, the first valve pocket 5 is sheathed on the first one-way valve seat 3 and the first one-way valve seat 3 passes through First screw 1 is connect with the first valve pocket 5, and the first valve pocket 5 has the internal thread hole for allowing the first screw 1 to be inserted into, the first one-way valve seat 3 With the first lock groove for allowing the first screw 1 to be inserted into.First one-way valve seat 3 is fixed on by the first screw 1 on the first valve pocket 5, One end of first one-way valve seat 3 and the inside for being inserted into the first valve pocket 5, the other end of the first one-way valve seat 3 are located at the first of valve body 2 In valve chamber.First one-way valve seat 3 and the first valve pocket 5 are linked into an integrated entity structure by the first screw 1, and the first one-way valve seat 3 is opposite It can be rotated in the first valve pocket 5 and around its axis, the first one-way valve seat 3 and the first valve pocket 5 realized by the first screw 1 Connection, in the axial direction, the first one-way valve seat 3 are relatively fixed with the holding of the first valve pocket 5, and the first one-way valve seat 3 is not in fall off The problem of, the reliability connected between the first one-way valve seat 3 and the first swivel nut 6 is improved, and improve when core assembly dismounts Operating efficiency.

As shown in Figure 1, Figure 2 and Figure 4, the first lock groove entirely circumferentially prolongs for the periphery upper edge in the first one-way valve seat 3 The annular groove stretched, it is to be uniformly distributed circumferentially on the first valve pocket 5 that multiple and all first screws 1, which are arranged, in the first screw 1.The The quantity for the internal thread hole 505 being arranged on one valve pocket 5 is identical as the quantity of the first screw 1, and each first screw 1 is respectively embedded into one In a internal thread hole 505, the axis perpendicular of the axis of internal thread hole 505 and the first valve pocket 5, internal thread hole 505 and for the The through-hole of setting is extended radially through on the side wall of one valve pocket 5.First lock groove is set to the first valve of insertion of the first one-way valve seat 3 On the periphery of end inside set 5, all first screws 1 are distributed in the surrounding of the first lock groove, a part for the first screw 1 It is inserted into internal thread hole 505, another part of the first screw 1 is inserted into the first lock groove, to which the first screw 1 can be in axial direction On position-limiting action is played to the first one-way valve seat 3 so that the first valve pocket 5 links into an integrated entity with the first one-way valve seat 3, while first Screw 1 can also circumferentially be slided in the first lock groove so that the first one-way valve seat 3 can be relative to the first valve pocket 5 It is rotated, when in the first valve chamber that core assembly is mounted on valve body 2 or when being dismantled from the first valve chamber, first can be rotated One-way valve seat 3 and make in 3 rotary course of the first one-way valve seat the first valve pocket 5 remain to and the first one-way valve seat 3 keep connection shape State will not detach between the first valve pocket 5 and the first one-way valve seat 3.

As shown in Figure 1 to Figure 3, the first one-way valve seat 3 is cirque structure and the first one-way valve seat 3 is with the first spool 7 Coaxial arrangement is to allow the centre bore of 7 partial insertion of the first spool, the centre bore and valve body 2 at the center of the first one-way valve seat 3 First working hole 201 is in connected state and centre bore and the first working hole 201 are coaxial, and the largest outer diameter of the first spool 7 is big In the diameter of centre bore.The centre bore of first one-way valve seat 3, the first working hole 201, the first valve chamber and third working hole 203 are The part in first medium channel, when the first spool 7 and the first one-way valve seat 3 are in discrete state, the first working hole 201 with Third working hole 203 is connected to, the first working hole 201, the centre bore of the first one-way valve seat 3, the first liquid pass hole 503, the first valve chamber First medium channel is formed with third working hole 203, first medium channel is in the conduction state at this time, the liquid from reversal valve Third working hole is flowed to through the first working hole 201, the centre bore of the first one-way valve seat 3, the first liquid pass hole 503 and the first valve chamber 203, final liquid enters in the rodless cavity of jack, realizes the jacking of jack.When the first spool 7 and the first one-way valve seat 3 When in contact condition, the first working hole 201 is not connected to third working hole 203, and first medium channel is interrupted, jack Liquid cannot be entered in rodless cavity.

As shown in Figure 1 to Figure 3, in the axial direction of the first core assembly, the first one-way valve seat 3 is located at the first working hole 201 And first between spool 7, the first valve seat 4 is between the second working hole 603 and the first spool 7.First one-way valve seat 3 and first One end of valve pocket 5 connects, the first valve seat 4 contacted with the other end face of the first valve pocket 5 and the first valve seat 4 by the first valve pocket 5 and First swivel nut 6 clamps.First one-way valve seat 3 and the first valve seat 4 are cirque structure, the first spool 7, the first one-way valve seat 3 Metal material being all made of with the first valve seat 4 to be made, the first spool 7 is identical as the material of the first one-way valve seat 3 and the first valve seat 4, The hardness of first one-way valve seat 3 and the first valve seat 4 is less than the hardness of the first spool 7, the first spool 7 and the first one-way valve seat 3 and First valve seat 4 is hard sealed connection, enhances sealing performance.First spool 7, the first one-way valve seat 3 and the first valve seat 4 are using gold Belong to material to be made, and to use vacuum hardening technology, refined again after quenching, hardness is high, hard close relative to the sealing of softwood matter Seal not only good seal performance, moreover it is possible to which resistance to super-pressure, double cross are long for the service life of check valve.And first spool 7 need to pass through it is true Empty quenching treatment in the ranges of HRC40~43, obtains high rigidity metal surface to Rockwell hardness, and the first spool 7 and first is unidirectional Sealing effect between valve seat 3 and the first valve seat 4 is good, improves the sealing performance that check valve is replaced in double cross.First spool 7 and first Hard sealing is formed between one-way valve seat 3 and the first valve seat 4, since valve body 2 is no longer directly connected and sealed with the first spool 7, Therefore valve body 2 and/or the first swivel nut 6 in order to meet hard seal request also there is no need to carry out corresponding heat treatment process, only Heat treatment process need to be carried out to the first one-way valve seat 3 and the first valve seat 4, therefore the knot of valve body 2 and the first swivel nut 6 can be simplified Structure simplifies processing technology, improves production efficiency.Preferably, the material of valve rod, the first one-way valve seat 3 and the first valve seat 4 is equal For 3Cr13, relative to the sealing of softwood matter, using hard sealing, shut-off valve not only good seal performance, moreover it is possible to which resistance to super-pressure uses Long lifespan.

As shown in Figure 1, Figure 2 and Figure 4, the first valve pocket 5 is both ends open and the cylinder of inner hollow, the first valve pocket 5 tool Have allow liquid by the first liquid pass hole 503 and the second liquid pass hole 504, valve body 2 have allow liquid flow out third working hole 203, third working hole 203 is connected to the first liquid pass hole 503 and the second liquid pass hole 504.First valve pocket 5 includes setting successively in an axial direction It sets and the first connecting portion 501 being connected and the first guide part 502, first connecting portion 501 and the first guide part 502 are annulus Shape structure and first connecting portion 501 and the coaxial arrangement of the first guide part 502, the interior diameter of first connecting portion 501 are led more than first To the interior diameter in portion 502, the overall diameter of first connecting portion 501 is more than the overall diameter of the first guide part 502, the first guide part 502 Length be more than first connecting portion 501 length, the first one-way valve seat 3 be inserted into first connecting portion 501 inner chamber body in and first One-way valve seat 3 is connect by the first screw 1 with first connecting portion 501, and internal thread hole 505 is the outer circle from first connecting portion 501 Start the through-hole on the inner headed face for extending radially to first connecting portion 501 of first connecting portion 501 on face.First spool 7 In the inner chamber body of the first guide part 502, the first guide part 502 plays guiding role to the first spool 7, and the first spool 7 is Axial direction in the inner chamber body of one guide part 502 along the first guide part 502 is moved, the largest outer diameter of the first spool 7 and the The interior diameter size of one guide part 502 is identical, and the length of the first spool 7 is less than the length of the first guide part 502.First liquid pass hole 503 and second liquid pass hole 504 be set on the first guide part 502, the first liquid pass hole 503 and the second liquid pass hole 504 are from first Start on the periphery of guide part 502 logical on the inner headed face for extending radially to the first guide part 502 of the first guide part 502 Hole, the first liquid pass hole 503 and the second liquid pass hole 504 are the axis phase of circular hole and the first liquid pass hole 503 and the second liquid pass hole 504 Parallel, in the axial direction of the first valve pocket 5, the first liquid pass hole 503 is located between first connecting portion 501 and the second liquid pass hole 504, the Two liquid pass holes 504 are between the first valve seat 4 and the first liquid pass hole 503.First liquid pass hole 503 is arranged more on the first valve pocket 5 A and all first liquid pass holes 503 are to be uniformly distributed circumferentially on the first valve pocket 5, and the second liquid pass hole 504 is on the first valve pocket 5 It is to be uniformly distributed circumferentially on the first valve pocket 5 that multiple and all second liquid pass holes 504, which are arranged,.First liquid pass hole 503 and second Liquid pass hole 504 is arranged to switch between opening state and closed state, and the first spool 7 is arranged to optionally make First liquid pass hole 503 and the second liquid pass hole 504 are in the open state.First liquid pass hole 503 is the part in first medium channel, When the first spool 7 and the first one-way valve seat 3 are in discrete state, the first liquid pass hole 503 is in the open state, the first spool 7 The second liquid pass hole 504 is covered, the second liquid pass hole 504 is closed, and the first working hole 201 passes through the first one-way valve seat 3 Centre bore, the inner chamber body of the first guide part 502, the first liquid pass hole 503 and the first valve chamber are connected to third working hole 203, and first Working hole 201, the centre bore of the first one-way valve seat 3, the inner chamber body of the first guide part 502, the first liquid pass hole 503, the first valve chamber First medium channel is formed with third working hole 203, first medium channel is in the conduction state at this time, in the first working hole 201 Centre bore of the liquid through the first one-way valve seat 3, the first guide part 502 inner chamber body, the first liquid pass hole 503 and the first valve chamber stream To third working hole 203, final liquid enters in the rodless cavity of jack.It is connect when the first spool 7 is in the first one-way valve seat 3 When the state of touching, the first spool 7 covers the first liquid pass hole 503, and the first liquid pass hole 503 is closed, the first working hole 201 with Third working hole 203 is not connected to, and first medium channel is interrupted, and the second liquid pass hole 504 is in the open state, at this time second medium Channel is in the conduction state, and the liquid in the rodless cavity of jack can be discharged into through second medium channel in fuel tank, and jack is realized It shrinks.

As shown in Figure 1, Figure 2 and Figure 4, the first liquid pass hole 503 is identical with the diameter of the second liquid pass hole 504, first In the axial direction of core assembly, the first liquid pass hole 503 is between the second liquid pass hole 504 and the first one-way valve seat 3, the second liquid pass hole 504 between liquid pass hole and the first valve seat 4, and the distance between the first liquid pass hole 503 and the second liquid pass hole 504 are less than the first mistake The distance between fluid apertures 503 and the first one-way valve seat 3, the distance between the first liquid pass hole 503 and the second liquid pass hole 504 are less than the The distance between two liquid pass holes 504 and the first valve seat 4.The axis of third working hole 203 be located at the first liquid pass hole 503 axis and Between the axis of second liquid pass hole 504, vertical range and second between the first liquid pass hole 503 and the first one-way valve seat 3 cross liquid Vertical range size between hole 504 and the first valve seat 4 is identical, and the length of the first spool is slightly larger than the first liquid pass hole 503 and the Vertical range between one one-way valve seat 3, the axial distance between the first liquid pass hole 503 and the second liquid pass hole 504 is smaller, and first The middle position of liquid pass hole 503 and 504 concentrated setting of the second liquid pass hole on the length direction of the first guide part 502, first Spool need to only select to close the first liquid pass hole 503 or the second liquid pass hole 504 every time so that the length of the first spool can be arranged It is shorter, save material, facilitate processing, reduce cost, and make double cross for the overall volume reduction of check valve, structure is tight It gathers.

As shown in Figure 1, Figure 2 and Figure 4, all first liquid pass holes 503 circumferentially uniformly divide on the first guide part 502 Cloth, all second liquid pass holes 504 are also to be uniformly distributed circumferentially on the first guide part 502.

As shown in figs. 1,2 and 6, the first swivel nut 6 is the cylinder of both ends open and inner hollow, the first valve pocket 5 One end is inserted into the inside of the first swivel nut 6 and is to be threadedly coupled with the first swivel nut 6, and one end of the first swivel nut 6 is inserted into the first of valve body 2 In valve chamber and the first swivel nut 6 is threadedly coupled with valve body 2, correspondingly, the first swivel nut 6 is equipped with external screw thread and internal thread, the first spiral shell The other end of set 6 extend out to the outside of valve body 2, convenient for the oil connection grafting with outside.There are one the second works for first swivel nut 6 tool Make mouth 603 (namely D mouths in Fig. 1 and Figure 11), the second working hole 603 is the axis and third of circular hole and the second working hole 603 The axis perpendicular of working hole 203, the second working hole 603 and the first working hole 201 are coaxial arrangement, and the second working hole 603 is Along first swivel nut 6 of being axially facing of the first swivel nut 6 since the end end face of the outside for extending out to valve body 2 of the first swivel nut 6 The circular hole that internal stretch is formed.Second working hole 603 is liquid return hole, and the first swivel nut 6 is to pass through oil pipe at the second working hole 603 It is attached with fuel tank, oil connection is inserted into the second working hole 603, and fuel tank is for recycling and providing fluid.First swivel nut 6 wraps The second connecting portion 601 and third interconnecting piece 602 that set gradually and be connected in an axial direction are included, second connecting portion 601 and third connect Socket part 602 is that cirque structure and second connecting portion 601 and third interconnecting piece 602 are coaxially disposed, second connecting portion 601 it is interior Diameter is more than the interior diameter of third interconnecting piece 602, and the length of third interconnecting piece 602 is more than the length of second connecting portion 601, and first In the inner chamber body of the insertion second connecting portion 601 of interconnecting piece 501 and first connecting portion 501 is threadedly coupled with second connecting portion 601, The periphery of first connecting portion 501 is equipped with external screw thread, and the inner headed face of second connecting portion 601 is equipped with internal thread.Second connection The overall diameter in portion 601 is identical as the diameter of the first valve chamber, and a part for third interconnecting piece 602 is inserted into the first valve chamber and the Three interconnecting pieces 602 are to be threadedly coupled with valve body 2, and the periphery of third interconnecting piece 602 is equipped with external screw thread, third interconnecting piece 602 Another part extend out to the outside of valve body 2.The inner chamber body of third interconnecting piece 602 is the second working hole 603, the first valve seat 4 In the inner chamber body of second connecting portion 601 and the interior diameter size phase of the overall diameter of the first valve seat 4 and second connecting portion 601 Together, it the first valve seat 4 and is clipped between the first valve pocket 5 and third interconnecting piece 602.

As shown in figs. 1,2 and 6, it with the first spool is coaxially to set that the first valve seat 4, which is cirque structure and the first valve seat 4, It sets, is to allow the centre bore of the first spool partial insertion at the center of the first valve seat 4, second work of the centre bore and the first swivel nut 6 The inner chamber body for making mouth 603 and the first guide part 502 is in connected state and centre bore and the second working hole 603 are coaxial, the first valve The largest outer diameter of core is more than the diameter of centre bore.The centre bore of second liquid pass hole 504 and the first valve seat 4 is second medium channel A part, when the first spool and the first valve seat 4 are in discrete state, the second liquid pass hole 504 is in the open state, the first valve Core covers the first liquid pass hole 503, and the first liquid pass hole 503 is closed, and the second working hole 603 passes through in the first valve seat 4 Heart hole, the inner chamber body of the first guide part 502, the second liquid pass hole 504 and the first valve chamber are connected to third working hole 203, the second work Make mouth 603, the centre bore of the first valve seat 4, the inner chamber body of the first guide part 502, the second liquid pass hole 504, the first valve chamber and third Working hole 203 forms second medium channel, and second medium channel is in the conduction state at this time, the liquid in the rodless cavity of jack It can be followed by third working hole 203, the first valve chamber, the second liquid pass hole 504, the inner chamber body of the first guide part 502, the first valve seat 4 centre bore and the second working hole 603, final liquid flow into fuel tank.When the first spool and the first valve seat 4 are in contact condition When, the first spool covers the second liquid pass hole 504, and the second liquid pass hole 504 is closed, the second working hole 603 and third work Make mouth 203 not to be connected to, second medium channel is interrupted, and the first liquid pass hole 503 is in the open state, at this time at first medium channel In conducting state.

As shown in Figure 1, Figure 2 and shown in Fig. 5, the first spool has the primary sealing area 701 for being contacted with the first one-way valve seat 3 With the secondary sealing area 702 for being contacted with the first valve seat 4.Primary sealing area 701 is located at the first sealed end of the first spool, the Two sealing surfaces 702 are located at the second sealed end of the first spool, the first sealed end and the second sealed end in the axial direction of the first spool Ends, the first sealed end and the second sealed end are frustum structure, and the structure of the first spool is simpler, and double cross is for unidirectional The more compact structure of valve entirety.Primary sealing area 701 and secondary sealing area 702 are circular conical surface and primary sealing area 701 and The taper size of two sealing surfaces 702 is identical, and primary sealing area 701 and secondary sealing area 702 are coaxial arrangement and primary sealing area 701 and secondary sealing area 702 axis be the first spool axis.First sealed end is for being inserted into the first one-way valve seat 3 To realize that the break-make in first medium channel controls in heart hole, the second sealed end is for being inserted into the centre bore of the first valve seat 4 with reality The break-make control in existing second medium channel.First one-way valve seat 3 has the first cooperation for being contacted with primary sealing area 701 Face, the first valve seat 4 have the second mating surface for being contacted with secondary sealing area 702, and the first mating surface and the second mating surface are equal For arc surface, sealing effect is good.

As shown in Figure 1, Figure 2, shown in Fig. 5 and Fig. 6, the first spool 7 is the cylinder of one end open and inner hollow, the first spool 7 open end is inserted into towards the first valve seat 4, resetting spring 8 in the inner chamber body of the first spool 7.First swivel nut 6 further includes being set to Limiting section 604 in the inner chamber body of third interconnecting piece 602, limiting section 604 are small for the interior diameter of cirque structure and limiting section 604 In the diameter of the second working hole 603, limiting section 604 is fixedly connected with the inner headed face of third interconnecting piece 602, limiting section 604 and Three interconnecting pieces 602 are coaxially disposed, and the second working hole 603 is connected by the centre bore of limiting section 604 and the centre bore of the first valve seat 4 It is logical.Resetting spring 8 is clipped between limiting section 604 and the first spool 7, resetting spring 8 and the centre bore across the first valve seat 4.It is multiple Position spring 8 is helical spring, and it is from limiting section 604 that limiting section 604, which has the location hole for allowing resetting spring 8 to be inserted into, location hole, The circular hole that the end face of the first spool 7 is formed initially towards the internal stretch of limiting section 604 is faced, one end of resetting spring 8 is inserted into In the inner chamber body of first spool 7, the other end of resetting spring 8 is inserted into location hole, and resetting spring 8 applies edge to the first spool 7 Axial active force, the first spool 7 match the positioning for realizing resetting spring 8 with limiting section 604, and resetting spring 8 is radially There are gap between the inner headed face of the first valve pocket 5, resetting spring 8 is not easy stuck or flexural deformation, improves reliability.

As shown in figures 1 and 3, the inside of valve body 2 have accommodate the second core assembly the second valve chamber, the second valve chamber be The circular cavity that 4th end end face of valve body 2 is formed initially towards the internal stretch of valve body 2, the axis of the second valve chamber and the first valve The axis perpendicular of chamber and the second valve chamber is located at the first valve chamber radially, the second swivel nut 12 are inserted into the second valve chamber of valve body 2 And second swivel nut 12 and valve body 2 be is threadedly coupled, fixation of the second core assembly of realization on valve body 2,9 He of the second one-way valve seat Second valve pocket 11 also is located in the second valve chamber of valve body 2.The inside of valve body 2 also has that there are one the 5th working hole 205 (namely Fig. 1 With the C mouths in Figure 11), the 5th working hole 205 is circular hole and the axis of the 5th working hole 205 mutually hangs down with the axis of the second valve chamber Directly, the 5th working hole 205 is initially towards the internal stretch of valve body 2 and to extend to the second valve chamber from the first end end face of valve body 2 The circular hole at place, the 5th working hole 205 be located at the second valve chamber radially and the 5th working hole 205 is connected to the second valve chamber, valve body 2 Third end and the 4th end be two opposite ends, the second valve chamber and third working hole 203 are coaxial arrangement, the first valve chamber position Between the second valve chamber and third working hole 203.The end face at the third end of valve body 2 and the end face at the 4th end are parallel, the second valve Liquid in chamber flows out valve body 2 through the 5th working hole 205.Valve body 2 is at the 5th working hole 205 by oil pipe and jack Rod chamber is attached, and oil connection is inserted into the 5th working hole 205.

As shown in Fig. 1, Fig. 7 and Fig. 8, the second valve pocket 11 is sheathed on the second one-way valve seat 9 and the second one-way valve seat 9 passes through Second screw 14 is connect with the second valve pocket 11, and the second valve pocket 11 has the internal thread hole for allowing the second screw 14 to be inserted into, and second is unidirectional Valve seat 9 has the second lock groove for allowing the second screw 14 to be inserted into.Second one-way valve seat 9 is fixed on the second valve by the second screw 14 On set 11, one end of the second one-way valve seat 9 and the inside for being inserted into the second valve pocket 11, the other end of the second one-way valve seat 9 are located at valve In second valve chamber of body 2.Second one-way valve seat 9 and the second valve pocket 11 are linked into an integrated entity structure by the second screw 14, and second is single It can be rotated to valve seat 9 relative to the second valve pocket 11 and around its axis, the second one-way valve seat 9 realized by the second screw 14 With the connection of the second valve pocket 11, in the axial direction, the second one-way valve seat 9 is relatively fixed with the holding of the second valve pocket 11, the second check valve Seat 9 is not in improve the reliability connected between the second one-way valve seat 9 and the second swivel nut 12, and improve the problem of falling off Operating efficiency when core assembly dismounts.

As shown in Fig. 1, Fig. 7 and Fig. 8, the second lock groove entirely circumferentially prolongs for the periphery upper edge in the second one-way valve seat 9 The annular groove stretched, it is circumferentially uniform point that multiple and all second screws 14, which are arranged, on the second valve pocket 11 in the second screw 14 Cloth.The quantity for the internal thread hole 1105 being arranged on second valve pocket 11 is identical as the quantity of the second screw 14, each second screw 14 It is respectively embedded into an internal thread hole 1105, the axis perpendicular of the axis of internal thread hole 1105 and the second valve pocket 11, internal thread Hole 1105 and to extend radially through the through-hole of setting on the side wall of the second valve pocket 11.Second lock groove is set to the second check valve On the periphery of end inside the second valve pocket of insertion 11 of seat 9, all second screws 14 are distributed in the surrounding of the second lock groove, A part for second screw 14 is inserted into internal thread hole 1105, and another part of the second screw 14 is inserted into the second lock groove, from And the second screw 14 can play position-limiting action to the second one-way valve seat 9 in the axial direction so that the second valve pocket 11 and second is unidirectional Valve seat 9 links into an integrated entity, while the second screw 14 can also circumferentially be slided in the second lock groove so that second is unidirectional Valve seat 9 can be rotated relative to the second valve pocket 11, when in the second valve chamber that core assembly is mounted on valve body 2 or from second When being dismantled in valve chamber, the second one-way valve seat 9 can be rotated and so that the second valve pocket 11 is remained in 9 rotary course of the second one-way valve seat Connection status is kept with the second one-way valve seat 9, will not be detached between the second valve pocket 11 and the second one-way valve seat 9.

As shown in Fig. 1, Fig. 7 and Fig. 8, the second one-way valve seat 9 is cirque structure and the second one-way valve seat 9 and the second spool It is to allow the centre bore of the second spool partial insertion, the centre bore and valve body 2 at the center of the second one-way valve seat 9 for coaxial arrangement The first valve chamber be in connected state and centre bore and third working hole 203 and the second valve chamber are coaxial, the maximum of the second spool is outer Diameter is more than the diameter of the centre bore of the second one-way valve seat 9.In the axial direction of the second valve chamber, the first liquid pass hole and the second liquid pass hole Between third working hole 203 and the second one-way valve seat 9.Centre bore, the second valve chamber and the 5th work of second one-way valve seat 9 Mouthfuls 205 form a part for third medium channels, when the second spool and the second one-way valve seat 9 are in discrete state, the first valve Chamber, the second one-way valve seat 9 centre bore be connected to the 5th working hole 205, first medium channel and third medium channel are equal at this time In the conduction state and first medium channel is connected to third medium channel, and the body in the rod chamber of jack is through the 5th working hole 205, the second valve chamber, the second one-way valve seat 9 centre bore flow to first medium channel, final liquid enters the rodless cavity of jack In, jack is jacked, and realizes the differential of jack.When the second spool and the second one-way valve seat 9 are in contact condition, the One valve chamber is not connected to the 5th working hole 205, and third medium channel is interrupted, and the liquid in the rod chamber of jack cannot enter Rodless cavity.

As shown in Fig. 1, Fig. 7 and Figure 10, in the axial direction of the second core assembly, the second one-way valve seat 9 is located at the first spool Between component and the second spool, the second valve seat 10 is located at the 4th working hole 1203 (the B mouths i.e. in Fig. 1 and Figure 11) and the second spool Between.Second one-way valve seat 9 is connect with one end of the second valve pocket 11, and the other end face of the second valve seat 10 and the second valve pocket 11 connects It touches and the second valve seat 10 is clamped by the second valve pocket 11 and the second swivel nut 12.Second one-way valve seat 9 and the second valve seat 10 are annulus Shape structure, the second spool, the second one-way valve seat 9 and the second valve seat 10 are all made of metal material and are made, the second spool and the second list Identical with the material of the second valve seat 10 to valve seat 9, the hardness of the second one-way valve seat 9 and the second valve seat 10 is less than the hard of the second spool Degree, the second spool and the second one-way valve seat 9 and the second valve seat 10 are hard sealed connection, enhance sealing performance.Second spool, Two one-way valve seats 9 and the second valve seat 10 are made of metal material, and to use vacuum hardening technology, are refined again after quenching, Hardness is high, hard to seal not only good seal performance relative to the sealing of softwood matter, moreover it is possible to which resistance to super-pressure, double cross make for check valve Use long lifespan.And second spool need to be handled by vacuum hardening to Rockwell hardness in the ranges of HRC40~43, obtain high rigidity Metal surface, the sealing effect between the second spool and the second one-way valve seat 9 and the second valve seat 10 is good, improves double cross for unidirectional The sealing performance of valve.Hard sealing is formed between second spool and the second one-way valve seat 9 and the second valve seat 10, no longer due to valve body 2 It is directly connected and sealed with the second spool, therefore also there is no need to be wanted to meet hard sealing for valve body 2 and/or the second swivel nut 12 It asks and carries out corresponding heat treatment process, need to only carry out heat treatment process to the second one-way valve seat 9 and the second valve seat 10, therefore can To simplify the structure of valve body 2 and the second swivel nut 12, simplify processing technology, improves production efficiency.Preferably, valve rod, second The material of one-way valve seat 9 and the second valve seat 10 is 3Cr13, and relative to the sealing of softwood matter, using hard sealing, shut-off valve is not only Good seal performance, moreover it is possible to which resistance to super-pressure, service life are long.

As shown in Fig. 1, Fig. 7 and Fig. 8, the second valve pocket 11 is both ends open and the cylinder of inner hollow, the second valve pocket 11 With allow liquid by third liquid pass hole 1103 and the 4th liquid pass hole 1104, valve body 2 have allows liquid flow out the 5th work Mouth 205, the 5th working hole 205 is connected to third liquid pass hole 1103 and the 4th liquid pass hole 1104.Second valve pocket 11 includes in an axial direction The 4th interconnecting piece 1101 and the second guide part 1102 for setting gradually and being connected, the 4th interconnecting piece 1101 and the second guide part 1102 be that cirque structure and the 4th interconnecting piece 1101 and the second guide part 1102 are coaxially disposed, the 4th interconnecting piece 1101 it is interior Diameter is more than the interior diameter of the second guide part 1102, and the overall diameter of the 4th interconnecting piece 1101 is more than the outer straight of the second guide part 1102 Diameter, the length of the second guide part 1102 are more than the length of the 4th interconnecting piece 1101, and the second one-way valve seat 9 is inserted into the 4th interconnecting piece In 1101 inner chamber body and the second one-way valve seat 9 is connect by the second screw 14 with the 4th interconnecting piece 1101, internal thread hole 1105 For the 4th interconnecting piece 1101 that extends radially to along the 4th interconnecting piece 1101 since on the periphery of the 4th interconnecting piece 1101 Through-hole on inner headed face.Second spool is located in the inner chamber body of the second guide part 1102, and the second guide part 1102 is to the second spool Guiding role is played, axial direction of second spool along the second guide part 1102 in the inner chamber body of the second guide part 1102 is moved Dynamic, the largest outer diameter of the second spool is identical with the interior diameter size of the second guide part 1102, and the length of the second spool is less than the The length of two guide parts 1102.Third liquid pass hole 1103 and the 4th liquid pass hole 1104 are set on the second guide part 1102, third Liquid pass hole 1103 and the 4th liquid pass hole 1104 are since on the periphery of the second guide part 1102 along the second guide part 1102 The through-hole on the inner headed face of the second guide part 1102 is extended radially to, third liquid pass hole 1103 and the 4th liquid pass hole 1104 are circle The hole and axis of third liquid pass hole 1103 and the 4th liquid pass hole 1104 is parallel, in the axial direction of the second valve pocket 11, third crosses liquid Between the 4th interconnecting piece 1101 and the 4th liquid pass hole 1104, the 4th liquid pass hole 1104 is located at the second valve seat 10 and in hole 1103 Between three liquid pass holes 1103.Third liquid pass hole 1103 be arranged on the second valve pocket 11 multiple and all third liquid pass holes 1103 be It is uniformly distributed circumferentially on second valve pocket 11, multiple and all 4th mistake liquid are arranged in the 4th liquid pass hole 1104 on the second valve pocket 11 Hole 1104 is to be uniformly distributed circumferentially on the second valve pocket 11.Third liquid pass hole 1103 and the 4th liquid pass hole 1104 are arranged to can be It is switched between opening state and closed state, the second spool is arranged to optionally make third liquid pass hole 1103 and the 4th Liquid pass hole 1104 is in the open state.Third liquid pass hole 1103 is a part for third medium channel, when the second spool and second When one-way valve seat 9 is in discrete state, third liquid pass hole 1103 is in the open state, and the second spool covers the 4th liquid pass hole 1104, the 4th liquid pass hole 1104 is closed, and third medium channel is in the conduction state at this time and third medium channel energy It is enough to be connected to first medium channel.When the second spool and the second one-way valve seat 9 are in contact condition, the second spool covers third Liquid pass hole 1103, third liquid pass hole 1103 are closed, and the first valve chamber is not connected to the 5th working hole 205, third medium Channel is interrupted, and the 4th liquid pass hole 1104 is in the open state, and the 4th medium channel is in the conduction state at this time, comes from reversal valve Liquid by the 4th medium channel flow into jack rod chamber in, jack realize shrink.

As shown in Fig. 1, Fig. 7 and Fig. 8, third liquid pass hole 1103 is identical with the diameter of the 4th liquid pass hole 1104, In the axial direction of two core assemblies, third liquid pass hole 1103 is between the 4th liquid pass hole 1104 and the second one-way valve seat 9, the 4th mistake Fluid apertures 1104 is located between liquid pass hole and the second valve seat 10, and the distance between third liquid pass hole 1103 and the 4th liquid pass hole 1104 are small In the distance between third liquid pass hole 1103 and the second one-way valve seat 9, between third liquid pass hole 1103 and the 4th liquid pass hole 1104 Distance be less than the distance between the 4th liquid pass hole 1104 and the second valve seat 10.The axis of 5th working hole 205 is located at third mistake Between the axis of fluid apertures 1103 and the axis of the 4th liquid pass hole 1104, between third liquid pass hole 1103 and the second one-way valve seat 9 Vertical range size between vertical range and the 4th liquid pass hole 1104 and the second valve seat 10 is identical, and the length of the first spool is bigger Vertical range between third liquid pass hole 1103 and the second one-way valve seat 9, third liquid pass hole 1103 and the 4th liquid pass hole 1104 Between axial distance it is smaller, the length of third liquid pass hole 1103 and 1104 concentrated setting of the 4th liquid pass hole in the second guide part 1102 The middle position on direction is spent, the second spool need to only select to close third liquid pass hole 1103 or the 4th liquid pass hole 1104 every time It closes so that the length of the second spool can be arranged shorter, save material, facilitate processing, reduce cost, and double cross is replaced The overall volume of check valve reduces, compact-sized.

As shown in Fig. 1, Fig. 7 and Fig. 8, all third liquid pass holes 1103 circumferentially uniformly divide on the second guide part 1102 Cloth, all 4th liquid pass holes 1104 are also to be uniformly distributed circumferentially on the second guide part 1102.

As shown in Fig. 1, Fig. 7 and Figure 10, the second swivel nut 12 is both ends open and the cylinder of inner hollow, the second valve pocket 11 One end be inserted into the inside of the second swivel nut 12 and be is threadedly coupled with the second swivel nut 12, one end of the second swivel nut 12 insertion valve body 2 The second valve chamber in and the second swivel nut 12 and valve body 2 be is threadedly coupled, correspondingly, the second swivel nut 12 is equipped with external screw thread and interior spiral shell The other end of line, the second swivel nut 12 extend out to the outside of valve body 2, convenient for the oil connection grafting with outside.Second swivel nut 12 has There are one the 4th working hole 1203 (namely B mouths in Fig. 1 and Figure 11), the 4th working hole 1203 is circular hole and the 4th working hole The axis perpendicular of 1203 axis and the 5th working hole 205, the 4th working hole 1203 are coaxial set with third working hole 203 It sets, the 4th working hole 1203 is since the end end face of the outside for extending out to valve body 2 of the second swivel nut 12 along the second swivel nut 12 Be axially facing the second swivel nut 12 internal stretch formed circular hole.Second swivel nut 12 is to pass through oil at the 4th working hole 1203 Pipe is attached with reversal valve, and oil connection is inserted into the 4th working hole 1203.Second swivel nut 12 includes setting gradually in an axial direction And the 5th interconnecting piece 1201 being connected and the 6th interconnecting piece 1202, the 5th interconnecting piece 1201 and the 6th interconnecting piece 1202 are circle Loop configuration and the 5th interconnecting piece 1201 and the 6th interconnecting piece 1202 are coaxially disposed, and the interior diameter of the 5th interconnecting piece 1201 is more than the The interior diameter of six interconnecting pieces 1202, the length of the 6th interconnecting piece 1202 are more than the length of the 5th interconnecting piece 1201, the 4th interconnecting piece In the inner chamber body of 1101 the 5th interconnecting pieces 1201 of insertion and the 4th interconnecting piece 1101 is threadedly coupled with the 5th interconnecting piece 1201, the The periphery of four interconnecting pieces 1101 is equipped with external screw thread, and the inner headed face of the 5th interconnecting piece 1201 is equipped with internal thread.5th connection The overall diameter in portion 1201 is identical as the diameter of the second valve chamber, the 6th interconnecting piece 1202 a part be inserted into the second valve chamber in and 6th interconnecting piece 1202 is to be threadedly coupled with valve body 2, and the periphery of the 6th interconnecting piece 1202 is equipped with external screw thread, the 6th interconnecting piece 1202 another part extend out to the outside of valve body 2.The inner chamber body of 6th interconnecting piece 1202 is the 4th working hole 1203, and second Valve seat 10 be located in the inner chamber body of the 5th interconnecting piece 1201 and the overall diameter of the second valve seat 10 and the 5th interconnecting piece 1201 it is interior straight Diameter size is identical, and the second valve seat 10 is simultaneously clipped between the second valve pocket 11 and the 6th interconnecting piece 1202.

As shown in Fig. 1, Fig. 7 and Figure 10, the second valve seat 10 is cirque structure and the second valve seat 10 and the second spool is same Axis is arranged, and is to allow the centre bore of the second spool partial insertion at the center of the second valve seat 10, the centre bore and the second swivel nut 12 The inner chamber body of 4th working hole 1203 and the second guide part 1102 is in connected state and centre bore and the 4th working hole 1203 is same Axis, the largest outer diameter of the second spool are more than the diameter of centre bore.The centre bore of 4th liquid pass hole 1104 and the second valve seat 10 is A part for 4th medium channel, when the second spool and the second valve seat 10 are in discrete state, the 4th liquid pass hole 1104 is in Opening state, the second spool cover third liquid pass hole 1103, and third liquid pass hole 1103 is closed, the 4th working hole 1203 Pass through the centre bore of the second valve seat 10, the inner chamber body of the second guide part 1102, the 4th liquid pass hole 1104 and the second valve chamber and the 5th Working hole 205 is connected to, the 4th working hole 1203, the centre bore of the second valve seat 10, the inner chamber body of the second guide part 1102, the 4th mistake Fluid apertures 1104, the second valve chamber and the 5th working hole 205 form the 4th medium channel, and the 4th medium channel is on shape at this time State, the liquid from reversal valve can be followed by the 4th working hole 1203, the centre bore of the second valve seat 10, the second guide parts 1102 Inner chamber body, the 4th liquid pass hole 1104, the second valve chamber and the 5th working hole 205, final liquid flows into the rod chamber of jack. When the second spool and the second valve seat 10 are in contact condition, the second spool covers the 4th liquid pass hole 1104, the 4th liquid pass hole 1104 are closed, and the 4th working hole 1203 is not connected to the 5th working hole 205, and the 4th medium channel is interrupted, third Liquid pass hole 1103 is in the open state, and third medium channel is in the conduction state at this time.

As shown in Fig. 1, Fig. 7 and Fig. 9, the second spool has the third sealing surface for being contacted with the second one-way valve seat 9 1301 and the 4th sealing surface 1302 for being contacted with the second valve seat 10.The third that third sealing surface 1301 is located at the second spool is close Sealing end, the 4th sealing surface 1302 are located at the 4th sealed end of the second spool, and third sealed end and the 4th sealed end are the second spool Axial direction on ends, third sealed end and the 4th sealed end are frustum structure, and the structure of the second spool is simpler, double The alternately more compact structure of check valve entirety.Third sealing surface 1301 and the 4th sealing surface 1302 are circular conical surface and third seals Face 1301 is identical with the taper size of the 4th sealing surface 1302, and third sealing surface 1301 and the 4th sealing surface 1302 are coaxial arrangement And the axis that the axis of third sealing surface 1301 and the 4th sealing surface 1302 is the second spool.Third sealed end is for being inserted into second To realize that the break-make of third medium channel controls in the centre bore of one-way valve seat 9, the 4th sealed end is for being inserted into the second valve seat 10 Centre bore in realize the 4th medium channel break-make control.Second one-way valve seat 9 have for third sealing surface 1301 First mating surface of contact, the second valve seat 10 have the second mating surface for being contacted with the 4th sealing surface 1302, the first cooperation Face and the second mating surface are arc surface, and sealing effect is good.

As shown in Fig. 1, Fig. 3 and Figure 11, double cross of the present invention for check valve A mouths (i.e. the first working hole 201) and B mouthfuls (i.e. 4th working hole 1203) connection reversal valve, C mouthfuls (i.e. the 5th working hole 205) connects the rod chamber of jack, E mouthfuls of (i.e. third works Make mouth 203) connection jack rodless cavity, D mouthful (i.e. the second working hole 603) be liquid return hole, D mouthfuls connect fuel tanks.A mouthfuls of feed liquors When, the first spool and the second spool are respectively under the action of fluid pressure by D mouthfuls and B mouthfuls closings, and A mouthfuls are connected to E mouthfuls, jack Rodless cavity feed liquor, while the liquid in the rod chamber of jack enters the rodless cavity of jack, realization through C mouthfuls and E mouthful successively It is differential；If when B mouthfuls of feed liquors, first direction closes A mouthfuls under the action of resetting spring, effect of second spool in fluid pressure The lower port by between C mouthfuls and E mouthfuls is closed, the rod chamber that the liquid from reversal valve enters jack through B mouthfuls and C mouthfuls successively In, while the liquid in the rodless cavity of jack is successively through E mouthfuls and D mouthfuls inflow fuel tanks.

The present invention is exemplarily described above in association with attached drawing.Obviously, present invention specific implementation is not by above-mentioned side The limitation of formula.As long as using the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention Within.

Claims (10)

1. check valve is replaced in double cross, including valve body, the first core assembly and the second core assembly, the axis of the first core assembly and the The axis perpendicular of two core assemblies, it is characterised in that：It is first be threadedly coupled that first core assembly, which includes with valve body, Swivel nut with the first swivel nut is the first valve pocket being threadedly coupled, the first one-way valve seat being connect with the first valve pocket, positioned at the first swivel nut The first internal valve seat and the first spool inside the first valve pocket and to be movably arranged, it is unidirectional that the first spool is located at first Between valve seat and the first valve seat；It is the second swivel nut being threadedly coupled and the second swivel nut that second core assembly, which includes with valve body, For the second valve pocket of threaded connection, the second one-way valve seat being connect with the second valve pocket, the second valve seat inside the second swivel nut With the second spool inside the second valve pocket and to be movably arranged, the second spool is located at the second one-way valve seat and the second valve seat Between.

2. check valve is replaced in double cross according to claim 1, it is characterised in that：It is single that first valve pocket is sheathed on described first To on valve seat and the first one-way valve seat is connect by the first screw with the first valve pocket, the first valve pocket have allow the first screw be inserted into Internal thread hole, the first one-way valve seat have the first lock groove for allowing the first screw to be inserted into.

3. check valve is replaced in double cross according to claim 2, it is characterised in that：First lock groove is single described first The annular groove entirely circumferentially extended to the periphery upper edge of valve seat, first screw are arranged multiple and multiple first screws and are It is uniformly distributed circumferentially.

4. check valve is replaced in double cross according to any one of claims 1 to 3, it is characterised in that：First one-way valve seat and institute One end connection of the first valve pocket is stated, first valve seat is contacted with the other end face of the first valve pocket and the first valve seat is by the first valve Set is clamped with first swivel nut, first spool have primary sealing area for being contacted with first one-way valve seat and Secondary sealing area for being contacted with first valve seat, primary sealing area and secondary sealing area are circular conical surface.

5. check valve is replaced in double cross according to any one of claims 1 to 4, it is characterised in that：First valve pocket, which has, allows liquid Body by the first liquid pass hole and the second liquid pass hole, the valve body have allow liquid by third working hole, third working hole It is connected to the first liquid pass hole and the second liquid pass hole；In the axial direction of first core assembly, first liquid pass hole is located at institute State between the second liquid pass hole and first one-way valve seat, the second liquid pass hole be located at the first liquid pass hole and first valve seat it Between, the distance between the first liquid pass hole and the second liquid pass hole are less than the distance between the first liquid pass hole and the first one-way valve seat, the The distance between one liquid pass hole and the second liquid pass hole are less than the distance between the second liquid pass hole and the first valve seat.

6. check valve is replaced in double cross according to any one of claims 1 to 5, it is characterised in that：Second valve pocket is sheathed on institute It states on the second one-way valve seat and the second one-way valve seat is connect by the second screw with the second valve pocket, the second valve pocket, which has, allows the second spiral shell The internal thread hole being inserted into is followed closely, the second one-way valve seat has the second lock groove for allowing the second screw to be inserted into.

7. check valve is replaced in double cross according to claim 6, it is characterised in that：Second lock groove is single described second The annular groove entirely circumferentially extended to the periphery upper edge of valve seat, second screw are arranged multiple and multiple second screws and are It is uniformly distributed circumferentially.

8. check valve is replaced in double cross according to any one of claims 1 to 7, it is characterised in that：Second one-way valve seat and institute One end connection of the second valve pocket is stated, second valve seat is contacted with the other end face of the second valve pocket and the second valve seat is by the second valve Set is clamped with second swivel nut, second spool have third sealing surface for being contacted with second one-way valve seat and The 4th sealing surface for being contacted with second valve seat, third sealing surface and the 4th sealing surface are circular conical surface.

9. check valve is replaced in double cross according to any one of claims 1 to 8, it is characterised in that：Second valve pocket, which has, allows liquid Body by third liquid pass hole and the 4th liquid pass hole, the valve body have allow liquid flow out the second drainage hole, the second drainage hole It is connected to third liquid pass hole and the 4th liquid pass hole.

10. check valve is replaced in double cross according to claim 9, it is characterised in that：In the axial direction of second core assembly, Between the 4th liquid pass hole and second one-way valve seat, the 4th liquid pass hole is located at third and crosses liquid the third liquid pass hole Between hole and second valve seat, the distance between third liquid pass hole and the 4th liquid pass hole are less than third liquid pass hole and second unidirectionally The distance between valve seat, the distance between third liquid pass hole and the 4th liquid pass hole are less than between the 4th liquid pass hole and the second valve seat Distance.