CN103090070A - Piloted type pressure reducing valve - Google Patents

Piloted type pressure reducing valve Download PDF

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Publication number
CN103090070A
CN103090070A CN2011103409825A CN201110340982A CN103090070A CN 103090070 A CN103090070 A CN 103090070A CN 2011103409825 A CN2011103409825 A CN 2011103409825A CN 201110340982 A CN201110340982 A CN 201110340982A CN 103090070 A CN103090070 A CN 103090070A
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CN
China
Prior art keywords
valve
pilot valve
guide
cavity volume
pilot
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CN2011103409825A
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Chinese (zh)
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CN103090070B (en
Inventor
俞传芬
李群华
林建荣
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广西柳工机械股份有限公司
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Priority to CN201110340982.5A priority Critical patent/CN103090070B/en
Publication of CN103090070A publication Critical patent/CN103090070A/en
Application granted granted Critical
Publication of CN103090070B publication Critical patent/CN103090070B/en

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Abstract

The invention discloses a piloted type pressure reducing valve and solves the problem that a pilot valve of an existing piloted type pressure reducing valve is easy to damage due to impact and large in noise. A differential type pilot valve is adopted in the piloted type pressure reducing valve, a first cavity communicated with an oil inlet is arranged on the inner side of the pilot valve, a second cavity communicated with a throttle hole is arranged on the outer side of the pilot valve, a pilot valve spool is arranged in a pilot valve seat, a conical portion of the pilot valve spool is arranged in the first cavity and connected with a buffering spring, a pressure regulating spring is arranged on the second cavity side and connected with the pilot valve seat, and a pilot valve gap, a radial through hole and an oil outlet channel between the pilot valve seat and the pilot valve spool form an opened oil discharging channel of the pilot valve. Via the differential type pilot valve, the inverted pilot valve spool, the buffering spring and the pilot valve seat which is capable of moving axially, and via damping effect of the pilot valve spool and the pilot valve throttle hole, impact force when the pilot valve is closed is reduced, the pilot valve is enabled to be always in stable state, so that the piloted type pressure reducing valve has the advantages of small impact, long service life, stability and low noise.

Description

Piloted reducer

Technical field

The present invention relates to the piloted reducer in the hydrovalve of hydraulic system, particularly hydraulic system.

Technical background

Reduction valve is pressure control valve commonly used in hydraulic system, is a kind of pressure regulator valve, is commonly used for and stablizes the oil circuit working pressure.Existing reduction valve is different with working principle by structure, can be divided into direct acting pressure and piloted reducer.And the piloted reducer use is especially extensive.

In existing piloted reducer, guide valve seat is fixed, pilot valve cone (also claiming guide valve core) withstands on guide valve seat by pressure adjusting spring, the filler opening of pilot valve is communicated with the Returnning spring chamber of reduction valve main valve plug, the low pressure oil outlet port of Returnning spring chamber and reduction valve is communicated with by throttle orifice, and the pressure adjusting spring chamber of pilot valve is and the hydraulic oil container circuit communication.When the pressure in reduction valve low pressure oil outlet port during lower than the set pressure of pressure adjusting spring, pilot valve is in closed condition, the pressure in low pressure oil outlet port equals the pressure in the Returnning spring chamber, main valve plug move under the elastic force effect of Returnning spring and the high pressure oil entrance that increases reduction valve to the oil circuit valve port opening in low pressure oil outlet port, improve the flow of the hydraulic oil that enters into the low pressure oil outlet port and improve the pressure in low pressure oil outlet port; When the pressure in low pressure oil outlet port during higher than the set pressure of pilot valve pressure adjusting spring, pilot valve is opened the pressure in Returnning spring chamber is reduced rapidly, main valve plug is at the effect lower compression Returnning spring of high pressure oil and move, reduce from the high pressure oil ingress to the valve port opening of the oil circuit in low pressure oil outlet port, and then reduce the flow that enters into the low pressure oil outlet port and reduce the pressure in low pressure oil outlet port.

Owing to there being a plurality of hydraulic actuators in hydraulic system, whether the work of these hydraulic actuators can cause the fluctuation of system pressure, and pilot valve is the also open and close continually along with the fluctuation of system liquid pressure pressure of pressure at stabilizing low voltage oil export place.And in existing piloted reducer, guide valve seat is fixed, when pilot valve cuts out, the pilot valve cone can impact guide valve seat under the promotion of pressure adjusting spring, and pilot valve opens and closes continually, makes also to exist frequently between pilot valve cone and guide valve seat to impact, guide valve seat and pilot valve cone are also fragile because impacting frequently, cause the life-span of reduction valve low, when pilot valve was opened simultaneously, the pilot valve cone was in vacant state, easy and valve seat collides and causes very large noise, has increased the noise radiation of machine.

Summary of the invention

The object of the invention is to pilot valve for existing reduction valve and be hit large and fragile and the large shortcoming of noise and provide a kind of simple in structure during work, good stability, noise is little, the piloted reducer of long service life.

technological scheme of the present invention is achieved in that a kind of piloted reducer of structure, comprise valve body, valve body is provided with high pressure oil entrance and low pressure oil outlet, be provided with valve pocket in valve body, be provided with main valve plug in valve pocket, main valve plug is along with it moves and change valve port opening from the high pressure oil entrance to the low pressure oil outlet port along its axial direction in valve pocket, also be slidably equipped with pilot valve in valve pocket, it is the first cavity volume between pilot valve and main valve plug, the opposite side of pilot valve has the second cavity volume, in the first cavity volume, the axially loaded area of liquid effects on pilot valve is greater than the axially loaded area of liquid effects in the second cavity volume on pilot valve, be provided with the main valve throttle orifice that is communicated with low pressure oil outlet and the first cavity volume on main valve plug, pilot valve is provided with the pilot valve throttle orifice that is communicated with the first cavity volume and the second cavity volume, pilot valve comprises guide valve seat and guide valve core, in the second cavity volume if guide valve core to the shift motion of the second cavity volume direction less than the limit stoper of guide valve seat to the second cavity volume direction sliding stroke, guide valve seat is provided with one and axially connects the pilot valve hole of guide valve seat, guide valve seat and valve pocket chamber wall sliding fit, guide valve core comprises that guide portion, the afterbody of head are used for and the tactile tapering that seals, the joint that is connected guide portion and tapering of forming of pilot valve hole point edge joint, the tapering is positioned at the first cavity volume, guide portion and pilot valve hole sliding fit, has the pilot valve gap between joint and pilot valve hole, when the tapering disengages with point limit, pilot valve hole, the pilot valve gap is communicated with the first cavity volume, guide valve seat is provided with the radial direction through hole that is communicated with the pilot valve gap, and valve body is provided with the oil discharge passage that is communicated with radial direction through hole and leads to the valve body outside, establish damping spring in the first cavity volume, one end of damping spring is connected with the contact of the tapering of guide valve core, the contact of the other end and main valve plug is connected, is provided with pressure adjusting spring in the second cavity volume side of pilot valve, and pressure adjusting spring contacts with guide valve seat and is connected and guide valve seat is applied to the elastic force of the first cavity volume direction.

the working procedure of this reduction valve is as follows: at first hydraulic oil enter the first cavity volume by the main valve throttle orifice, when the pressure in low pressure oil outlet port during lower than the set pressure of pressure adjusting spring, pressure in the first cavity volume is identical with the pressure in low pressure oil outlet port, main valve plug moves under the promotion of Returnning spring and increases the valve port opening of reduction valve, increases the flow that enters into the low pressure oil outlet port and the pressure that promotes the low pressure oil outlet port, when the pressure in low pressure oil outlet port during higher than the set pressure of pressure adjusting spring, hydraulic oil in the first cavity volume and damping spring to the active force of pilot valve greater than hydraulic oil and the pressure adjusting spring active force to pilot valve in the second cavity volume, make pilot valve move (hydraulic oil of the second cavity volume also flows to the first cavity volume by the pilot valve throttle orifice) to the second cavity volume direction, when guide valve core contacts with limit stoper, guide valve core stops mobile, guide valve seat continues mobile, this moment, the point limit, pilot valve hole of guide valve core tapering and guide valve seat disengaged, the first cavity volume is communicated with the pilot valve gap, hydraulic oil in the first cavity volume is by the pilot valve gap, radial direction through hole, oil discharge passage flow valves external body is to hydraulic oil container, pressure in the first cavity volume is reduced rapidly, main valve plug pilot valve direction moves under the pressure-acting of high pressure oil ingress hydraulic oil, high pressure oil entrance to the valve port opening in low pressure oil outlet port is reduced, reduce the hydraulic fluid flow rate that enters the low pressure oil outlet port, thereby also just reduced the pressure in low pressure oil outlet port.When the pressure decreased in the first cavity volume during to certain value, hydraulic oil in the first cavity volume and damping spring to the axial force of pilot valve less than hydraulic oil and the pressure adjusting spring axial force to pilot valve in the second cavity volume, guide valve seat moves to the main valve plug direction under the effect of pressure adjusting spring, the point limit, pilot valve hole of guide valve seat is contacted with the tapering of guide valve core, disconnection is from the oil circuit in the first cavity volume and pilot valve gap, make the boost in pressure of the first cavity volume, the main valve plug both sides again reach stress balance and keep motionless straight, thereby keep the pressure stability at low pressure oil outlet place constant.

In the present invention, guide valve core is slidedly arranged in the pilot valve hole of guide valve seat, the sliding fit in the guide portion by guide valve core and pilot valve hole only can endwisely slip along guide's valve opening it, pilot valve is in unlatching or closed condition is all to belong to steady state, can not produce skew radially, even do not utter long and high-pitched sounds so can not produce vibration, can not increase the noise radiation of machine.the open and close of pilot valve are also by adopting control that pressure adjusting spring carries out on the basis of the hydraulic difference of pilot valve two ends the first cavity volume and the second cavity volume, the rigidity of pressure adjusting spring and pilot valve are at the first cavity volume, axially loaded area difference in the second cavity volume is relevant, when this difference more hour, the rigidity requirement of pressure adjusting spring is just less, therefore the present invention can act on axially loaded area on pilot valve less than hydraulic oil in the first cavity volume slightly by the axially loaded area difference that design acts on pilot valve hydraulic oil in the second cavity volume, thereby can select the very little pressure adjusting spring of a rigidity.Little rigidity pressure adjusting spring moves when closing pilot valve promoting guide valve seat, and the impact of guide valve core and guide valve seat is just little, and guide valve core by the less damping spring connection of rigidity, plays buffer function when guide valve seat contacts with guide valve core simultaneously.In the process that pilot valve cuts out, pressure adjusting spring promotes guide valve seat and moves, the volume of the second cavity volume increases, hydraulic oil enters the second cavity volume by the oil circuit that is communicated with in the first cavity volume and the second cavity volume, owing to being provided with the pilot valve throttle orifice on this oil circuit, the fluid of this oil circuit of flowing through is had damping function, thereby slow down the travelling speed of guide valve seat, impact when the reduction guide valve seat contacts with guide valve core further reduces and impacts, thereby increased the working life of reduction valve.

In the present invention, limit stoper is limited post, and the one end is fixedly connected with valve body, and the other end is the positive stop end that is connected for the guide valve core contact.Valve body comprises valve pocket and bonnet, and bonnet is threaded mutually with valve pocket, and limited post and bonnet can be integrative-structures, also can be provided with in the inboard of bonnet the endoporus with limited post socket, limited post be fixedly connected with endoporus by screw thread or the drive fit sleeve in endoporus; Can also be provided with locking cap in addition in bonnet, the center of locking cap is provided with the limited post fixed hole, the limited post sleeve forms a fixed connection in fixed hole, the outer side surface of locking cap and the inner side surface of bonnet are connected, one end of pressure adjusting spring is connected with the contact of the shade of locking cap, establish the pressure regulation pad between pressure adjusting spring and locking cap, the elastic force of Regulation spring.

In the present invention, the pilot valve throttle orifice can be arranged on guide valve seat, also can be arranged on guide valve core, in the time of on being arranged on guide valve core, the positive stop end end face of limited post is provided with from the logical oily passage that end face flows into, flow out the side, and logical oily passage is communicated with the oil circuit that is communicated with the first cavity volume and the second cavity volume when guide valve core is connected with the spacing end contact of limited post.Logical oily passage can be that the perforation of the connection counterbore that arranges of the side by the counterbore that arranges on the positive stop end end face, positive stop end consists of, and logical oily passage can be the groove that arranges on the positive stop end end face.

In the present invention, guide valve seat can with the inwall sliding fit of valve pocket, pilot valve and valve body form the second cavity volume at pilot valve with respect to the opposite side of the first cavity volume, are provided with the first seal groove on guide valve seat and outer side surface that valve pocket coordinates, and the first seal groove is embedded with the first seal ring.Valve body can comprise valve seat, valve pocket, bonnet in addition, and an end of valve seat and valve pocket socket-connects, the other end of valve pocket and bonnet bolt, and main valve plug is slidedly arranged in valve seat, and oil discharge passage is to be arranged on socket-connect oil groove on part surface of valve seat and valve pocket.Guide valve seat is slidedly arranged in valve seat near the sections of the first cavity volume, sections near the second cavity volume is slidedly arranged in valve pocket, or seal sleeve is set in valve pocket, the madial wall of seal sleeve and guide valve seat are near the sections sliding fit of the second cavity volume, one end of seal sleeve is connected with the bonnet contact, and the other end is connected with the valve seat contact.Seal sleeve is set and guide valve seat is sealed and matched, easily guarantees the coaxality of inner side surface and the guide valve seat of seal sleeve, make the guide valve seat free sliding smooth and easy.

Can be also that guide valve seat arranges cavity near on the end face of limited post in addition, the sidewall of cavity coordinates with the limited post outer side surface, forms sliding fit, and guide valve seat and limited post consist of the second cavity volume.Be provided with the second seal groove on limited post and side that guide valve seat matches, the second seal groove is embedded with the second seal ring.

The present invention compared with prior art has following beneficial effect:

1, the present invention designs namely by differential type and makes pilot valve be subjected to the lifting surface area of hydraulic oil axial action in the second cavity volume to be slightly less than the lifting surface area that pilot valve is subjected to hydraulic oil axial action in the first cavity volume by design, thereby select the less pressure adjusting spring of a rigidity, the impact of guide valve seat and guide valve core when reducing the pilot valve open and close, close when contacting at guide valve seat and guide valve core, the damping spring that contacts with guide valve core can cushion guide valve seat to the impact of guide valve core, when pilot valve cuts out in addition, the pilot valve throttle orifice plays damping function, impact when the reduction pilot valve cuts out between guide valve seat and guide valve core, thereby can extend the working life of pilot valve, also namely extend the working life of reduction valve.

2, in the present invention, guide valve core is slidedly arranged in the pilot valve hole of guide valve seat, rely on guide portion and the pilot valve hole sliding fit of its head to carry out radial location, it only can endwisely slipped along the pilot valve hole, and no matter pilot valve is in is closed or opening state, can not produce in the radial direction skew and vibration; Under the elastic force effect of damping spring, when pilot valve cuts out, guide valve core contacts with guide valve seat, contacts with limit stoper when pilot valve is opened, so in the axial direction also all the time for steady state.Therefore reduction valve of the present invention pilot valve friction, noise when work is little, can not increase the noise radiation of machine.

Description of drawings

Fig. 1 is the structural representation sketch of reduction valve in the embodiment of the present invention 1;

Fig. 2 is the pilot valve of executing reduction valve in example 1 structural representation when contacting with limit stoper;

Fig. 3 is the structural representation of cartridge pressure reduction valve in the embodiment of the present invention 2;

Fig. 4 is the structural representation of plug-in overflow valve in the embodiment of the present invention 3;

Fig. 5 is the structural representation of plug-in overflow valve in the embodiment of the present invention 4.

Component title and sequence number in figure:

plug screw 1, low pressure oil outlet 2, main valve plug circular groove 3, main valve plug 4, damping spring 5, the first cavity volume 6, guide valve core 7, guide valve seat 8, pilot valve oil outlet 9, valve pocket 10, limited post 11, the second cavity volume 12, pressure adjusting spring 13, pressure regulation pad 14, bonnet 15, main valve throttle orifice 16, high pressure oil entrance 17, main valve plug annular boss 18, the first seal groove 19, the first seal ring 20, radial direction through hole 21, counterbore 22, radially penetration hole 23, guide portion 24, joint 25, pilot valve gap 26, tapering 27, pilot valve throttle orifice 28, valve piece 19, high-pressure oil passage 30, tank oiling channel oil 31, locking cap 32, low pressure oil way 33, valve seat 34, seal sleeve 35, oil groove 36, guide valve core mesopore 37, the second seal groove 38, the second seal ring 39.

Embodiment

Below in conjunction with drawings and Examples, Differential Relief Valve of the present invention is described.

Embodiment 1:

As shown in Figure 2 in Fig. 1, the valve body of piloted reducer comprises valve pocket 10, the plug screw 11 and the bonnet 15 that are spirally connected respectively at valve pocket 10 two ends, be provided with high pressure oil entrance 17 and low pressure oil outlet 2 on valve body, be provided with valve pocket at valve inner, be provided with main valve plug 4, pilot valve in valve pocket.The chamber wall sliding fit of main valve plug 4, pilot valve and valve pocket forms the first cavity volume 6, the first cavity volumes 6 and is communicated with low pressure oil outlet 2 by oil circuit and main valve throttle orifice 16 between pilot valve and main valve plug 4, an other side of pilot valve is the second cavity volume 12.pilot valve comprises guide valve core 7 and guide valve seat 8, the pilot valve hole is established at the center of guide valve seat 8, the pilot valve hole is axial penetration hole, guide valve core 7 comprises the guide portion 24 of head, the tapering 27 of afterbody, the joint 25 that connects guide portion and tapering, wherein guide portion 24 is slidedly arranged in the pilot valve hole and forms sealed sliding with valve opening and coordinates, pilot valve gap 26 is arranged between the inwall in joint 25 and pilot valve hole, tapering 27 is positioned at the first cavity volume 6, when tapering 27 disengages with point limit, pilot valve hole, the first cavity volume 6 is communicated with pilot valve gap 26, when touch with the sharp edge joint in pilot valve hole in tapering 27, the first cavity volume 6 is closed with the oil circuit in pilot valve gap 26, guide valve core 7 is provided with the pilot valve throttle orifice 28 that is communicated with the first cavity volume 6 and the second cavity volume 12.Be provided with radial direction through hole 21 on guide valve seat 8, radial direction through hole 21 is communicated with pilot valve gap 26.Be provided with the pilot valve oil outlet 9 that is communicated with radial direction through hole 21 on valve pocket 10.The external diameter that guide valve seat 8 closes on the side section of the first cavity volume 6 closes on the external diameter of the second cavity volume 12 side sections greater than guide valve seat 8, make hydraulic oil in the first cavity volume 6 act on pilot valve axially effectively lifting surface area act on axially effective lifting surface area on pilot valve greater than the second interior hydraulic oil of cavity volume 12.Between guide valve core 7 and main valve plug 4, damping spring 5 is set.Be provided with pressure adjusting spring 13 in the second cavity volume 12, an end of pressure adjusting spring 13 withstands guide valve seat 8,15 contacts of the other end and bonnet is connected and and bonnet 15 between pressure regulation pad 14 is set with the elastic force of adjusting pressure adjusting spring 13.Be provided with limited post 11 in the second cavity volume 12, limited post 11 is to be structure as a whole with bonnet 14, its termination is the positive stop end that contacts for the termination of the guide portion 24 of guide valve core 7, and when pilot valve was moved to the second cavity volume 12 directions, the sliding stroke of guide valve core 7 was less than the stroke of guide valve seat 8.Be provided with counterbore 22, side and be provided with the radially penetration hole 23 that is communicated with counterbore 22 on the spacing end face of limited post 11, during the spacing end contact of guide valve core 7 and limited post 11, the second cavity volume 12 is by radially penetration hole 23, counterbore 22 are communicated with pilot valve throttle orifice 28.Be provided with the first interior seal ring 20 that arranges of seal groove 19, the first seal grooves 19 on guide valve seat 8 size diameter sections and side that valve pocket coordinates.

in the piloted reducer of the present embodiment, when the pressure at low pressure oil outlet 2 places equaled the set pressure of pressure adjusting spring 13, main valve plug 4 was in steady state under the impetus of damping spring 5, keep stable aperture, when the pressure at low pressure oil outlet 2 places during lower than the set pressure of pressure adjusting spring 13, the direction of pilot valve of main valve plug 4 supporting or opposing under the promotion of damping spring 5 moves, space between main valve plug annular boss 18 and valve pocket 10 chamber walls increases, the aperture of the valve port of outlet 2 increases from main valve plug circular groove 3 to low pressure oil, also namely improve the hydraulic fluid flow rate that enters into low pressure oil outlet 2 places from high pressure oil entrance 17, improve the pressure at low pressure oil outlet 2 places, when the pressure at low pressure oil outlet 2 places during higher than the set pressure of pressure adjusting spring 13, pressure in the first cavity volume 6 equals the pressure at low pressure oil outlet 2 places, hydraulic oil in the first cavity volume 6 and the active force of 5 pairs of pilot valves of damping spring are greater than the active force of the second interior hydraulic oil of cavity volume 12 and 13 pairs of pilot valves of pressure adjusting spring, hydraulic oil in the first cavity volume 6 promotes guide valve seat 8 and together moves with guide valve core 7 and compress pressure adjusting spring 13, after the spacing end contact of guide valve core 7 and limited post 11, guide valve core 7 no longer moves, guide valve seat 8 continues mobile, when guide valve seat 8 continues to move, the tapering 27 of guide valve core 7 disengages with the sharp limit in pilot valve hole, hydraulic oil in the first cavity volume 6 is by pilot valve gap 26, radial direction through hole 21, pilot valve oil outlet 9 flows to the hydraulic oil container of hydraulic system, cause the pressure in the first cavity volume 6 to reduce rapidly, make the direction of main valve plug 4 pilot valves move, reduce the aperture of valve port, also namely reduce the flow that high pressure oil entrance 17 places flow to low pressure oil outlet 2 places, make the pressure decreased at low pressure oil outlet 2 places.when the pressure decreased in the first cavity volume 6 during to certain value, hydraulic oil in the first cavity volume 6 and the active force of 5 pairs of pilot valves of damping spring are less than the active force of the second interior hydraulic oil of cavity volume 12 and 13 pairs of pilot valves of pressure adjusting spring, guide valve seat 8 moves to the direction of main valve plug 4 under the promotion of pressure adjusting spring 13, the sharp limit of the valve opening of guide valve seat 8 contacts with the tapering 27 of guide valve core 7 and forms sealing, close the first cavity volume 6 to the pilot valve gap 26 oil circuit, make the boost in pressure in the first cavity volume 6 and stop deciding the movement of main valve plug 4, make main valve plug 4 keep current apertures and the pressure at stabilizing low voltage oil export 2 places.when the valve opening of guide valve seat 8 point limit contacts with the tapering of guide valve core 7, guide valve core 7 compression damping springs 5 move to the main valve plug direction, damping spring 5 plays buffer function, reduce the percussion of 8 pairs of guide valve cores 7 of guide valve seat, in addition in the process that guide valve seat 8 moves, the volume of the second cavity volume 12 increases, hydraulic oil enters into the second cavity volume 12 by pilot valve throttle orifice 28, but the damping function due to pilot valve throttle orifice 28, slow down hydraulic oil and enter into the second cavity volume 12, also namely slowed down the travelling speed of guide valve seat 8, further reduce the impact force of 8 pairs of guide valve cores 7 of guide valve seat, improve the working life of pilot valve.

Embodiment 2:

As shown in Figure 3, in the present embodiment, reduction valve is cartridge pressure reduction valve, be provided with screw thread on valve pocket 10, when carrying out plug-in mounting with valve piece 29 and valve piece 29 bolts, high pressure oil entrance 17 on valve pocket and low pressure oil outlet 2 is communicated with high-pressure oil passage 30 and low pressure oil way 33 on valve piece 29 respectively, and the pilot valve oil outlet 9 on valve pocket 10 is communicated with tank oiling channel oil 31 on valve piece 29.This enforcement is compared with the first embodiment, its structure main difference point is the means of fixation of limited post 11, in the present embodiment, valve body is included in the locking cap 32 of bonnet 15 interior settings, the center of locking cap 32 is provided with the fixedly fixed hole of limited post 11, limited post 11 sleeves are fixedly connected with locking cap 32 in fixed hole, the outer of locking cap 32 coordinates with the madial wall of bonnet 15, pressure adjusting spring 13 withstands on locking cap 32 bottom of bonnet 15, between pressure adjusting spring 13 and locking cap 32, pressure regulation pad 14 is set.

Embodiment 3:

as shown in Figure 4, in the present embodiment, reduction valve is cartridge pressure reduction valve, compare the valve body that its difference is the reduction valve in the present embodiment with embodiment 2 and comprise valve seat 34, valve pocket 10, bonnet 15, valve pocket 10 is socketed on an end of valve seat 34, the outside, termination that valve pocket 10 is socketed on valve seat is provided with the screw thread that is threaded for valve piece 29, bonnet 15 is bolted in the other end of valve pocket 10, main valve plug 4 is slidedly arranged in valve seat, high pressure oil entrance 17 is arranged on the side of valve seat 34, low pressure oil outlet 2 is arranged on the end face of valve seat 34, the circular groove 3 of main valve plug is communicated with the main valve plug mesopore 37 of main valve plug core, hydraulic oil is from the circular groove 3 of high pressure oil entrance 17 through main valve plug 4 sides, main valve plug mesopore 37 flows out from low pressure oil outlet 2, wherein main valve plug 4 moving axially in valve seat 34 can change valve port opening from high pressure oil entrance 17 to main valve plug side circular groove 3 with the hydraulic fluid flow rate that changes the outlet 2 from high pressure oil entrance 17 to the low pressure oil pressure with regulating and controlling low pressure oil outlet 2, be arranged with seal sleeve 35 in valve pocket 10, one end of seal sleeve 35 is connected with valve seat 34 contacts, the other end is connected with bonnet 15 contacts, the enlarged diameter section of guide valve seat 8 is slidedly arranged in valve seat 34, reduced diameter section is slidedly arranged in seal sleeve 35.The outside of the part that socket-connects at valve seat 34 and valve pocket 10 is provided with oil groove 36, and an end of oil groove 36 is communicated with radial direction through hole 21 by the gap of valve seat end face, and the other end communicates with tank oiling channel oil 31 on valve piece 29 and forms the pilot valve oil outlet.

Embodiment 4:

As shown in Figure 5, compare with embodiment 3, its difference is on end face that the contact of guide valve seat 8 and pressure adjusting spring is connected, a cavity is arranged, the outer side wall sliding fit of the sidewall of cavity and limited post 11, consist of the second cavity volume 12 between pilot valve and limited post 11, the diameter of limited post 11 and the pilot valve cavity chamber wall section of cooperation is less than the diameter of guide valve seat 8 with valve seat 34 sections of cooperation, be provided with the second seal groove 38 on limited post 11 and side that guide valve seat 8 matches, be embedded in seal ring 39 at seal groove 38, limited post 11 is fixedly connected with bonnet by locking cap 32.

Claims (10)

1. piloted reducer, comprise valve body, described valve body is provided with high pressure oil entrance (17) and low pressure oil outlet (2), be provided with valve pocket in valve body, be provided with main valve plug (4) in valve pocket, described main valve plug (4) is along with it moves and change from high pressure oil entrance (17) to low pressure oil the valve port opening of outlet (2) along its axial direction in valve pocket, it is characterized in that also being slidably equipped with pilot valve in valve pocket, be the first cavity volume (6) between described pilot valve and main valve plug (4), the opposite side of pilot valve has the second cavity volume (12), the axially loaded area of the interior liquid effects of the first cavity volume (6) on pilot valve is greater than the axially loaded area of liquid effects on pilot valve in the second cavity volume (12), be provided with the main valve throttle orifice (16) that is communicated with low pressure oil outlet (2) and the first cavity volume (6) on main valve plug (), pilot valve is provided with the pilot valve throttle orifice (28) that is communicated with the first cavity volume (6) and the second cavity volume (12), described pilot valve comprises guide valve seat (8) and guide valve core (7), in the second cavity volume (12) if guide valve core (7) to the shift motion of the second cavity volume (12) direction less than the limit stoper of guide valve seat (8) to the second cavity volume (12) sliding stroke, guide valve seat (8) is provided with one and axially connects the pilot valve hole of guide valve seat, guide valve seat (8) and valve pocket chamber wall sliding fit, described guide valve core (7) comprises the guide portion (24) of head, afterbody is used for and the tactile tapering (27) that forms sealing of point edge joint, pilot valve hole, the joint (25) that connects guide portion (24) and tapering (27), described tapering (27) is positioned at the first cavity volume (6), described guide portion (24) and described pilot valve hole sliding fit, has pilot valve gap (26) between described joint (25) and pilot valve hole, when tapering (27) disengages with point limit, pilot valve hole, pilot valve gap (26) are communicated with the first cavity volume (6), guide valve seat (8) is provided with the radial direction through hole (21) that is communicated with pilot valve gap (26), valve body is provided with the oil discharge passage (9) that is communicated with radial direction through hole (21) and leads to the valve body outside, establish damping spring (5) in the first cavity volume (6), one end of damping spring (5) is connected with tapering (27) contact of guide valve core (7), the other end is connected with main valve plug (4) contact, the second cavity volume (12) side at pilot valve is provided with pressure adjusting spring (13), and pressure adjusting spring (13) is connected and guide valve seat is applied to the elastic force of the first cavity volume (6) direction with guide valve seat (8) contact.
2. piloted reducer according to claim 1, is characterized in that, described limit stoper is limited post (11), and the one end is fixedly connected with valve body (10), and the other end is the positive stop end that is connected for guide valve core (7) contact.
3. piloted reducer according to claim 2, it is characterized in that, pilot valve throttle orifice (28) is arranged on described guide valve core (7), the positive stop end end face of described limited post (11) is provided with from the logical oily passage that end face flows into, flow out the side, and described logical oily passage second cavity volume (12) when guide valve core (7) is connected with the positive stop end end contact is communicated with the first cavity volume (6) with pilot valve throttle orifice (28) by logical oily passage.
4. piloted reducer according to claim 2, it is characterized in that, described valve body comprises valve pocket (10) and bonnet (15), described bonnet (15) and valve pocket (10) bolt, and described limited post (11) is fixedly connected with described bonnet (15).
5. piloted reducer according to claim 4, it is characterized in that, be provided with locking cap (32) in described bonnet (15), the center of described locking cap (32) is provided with the limited post fixed hole, limited post (11) sleeve is in fixed hole, the inner side surface of the outer side surface of described locking cap (32) and described bonnet (15) is connected, and an end of described pressure adjusting spring (13) is connected and provides the elastic force of guide valve seat (8) dorsad to locking cap with locking cap (32) contact.
6. the described piloted reducer of any one according to claim 2 to 5, it is characterized in that, the end face of the contiguous limited post of described guide valve seat (8) (11) is provided with a cavity, and the side sliding fit of the chamber wall of described cavity and limited post (11) connects and composes described the second cavity volume (12).
7. the described piloted reducer of any one according to claim 1 to 5, it is characterized in that, be provided with the first seal groove (19) on described guide valve seat (8) and outer side surface that valve pocket chamber wall coordinates, described the first seal groove (19) is embedded with the first seal ring (20).
8. piloted reducer according to claim 7, it is characterized in that, be provided with the second seal groove (38) on described limited post (11) and side that guide valve seat (8) matches, described the second seal groove is embedded with the second seal ring (39).
9. the described piloted reducer of any one according to claim 1 to 3, it is characterized in that, described valve body comprises valve seat (34), valve pocket (10), bonnet (15), described valve seat (34) socket-connects with an end of valve pocket (10), the other end of valve pocket (10) and bonnet (15) bolt, described main valve plug (4) is slidedly arranged in valve seat (34), and described oil discharge passage is for being arranged on socket-connect oil groove (36) on part surface of valve seat (34) and valve pocket (10).
10. piloted reducer according to claim 9, it is characterized in that, described guide valve seat has seal sleeve (35) near the arranged outside of the sections of the second cavity volume (12), the madial wall of described seal sleeve (35) and guide valve seat (8) sliding fit, one end of seal sleeve (35) is connected with bonnet (15) contact, and the other end is connected with valve seat (34) contact.
CN201110340982.5A 2011-11-02 2011-11-02 Piloted reducer CN103090070B (en)

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Publication number Priority date Publication date Assignee Title
CN103122880A (en) * 2011-11-18 2013-05-29 广西柳工机械股份有限公司 Adjustable pilot reducing valve
CN103470562A (en) * 2013-09-06 2013-12-25 鞍钢股份有限公司 High-frequency counterbalance valve and counterbalancing method thereof
CN104455472A (en) * 2014-10-24 2015-03-25 中国工程物理研究院化工材料研究所 Charging-discharging valve
CN105605254A (en) * 2016-03-18 2016-05-25 中国船舶重工集团公司第七0四研究所 Supplement load type high-pressure air safety valve with buffering on-off function
CN106122152A (en) * 2016-08-31 2016-11-16 山东泰丰液压股份有限公司 Ultra high pressure control valve

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CN201269336Y (en) * 2008-07-18 2009-07-08 宁波星箭航天机械厂 Gas pressure reducing valve
CN201284857Y (en) * 2008-10-31 2009-08-05 徐州重型机械有限公司 Balance valve
CN201288869Y (en) * 2008-10-28 2009-08-12 上海立新液压有限公司 Balance control valve
CN201747984U (en) * 2010-06-25 2011-02-16 徐州徐工挖掘机械有限公司 Throttling and reducing integrated valve

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SU612091A1 (en) * 1977-01-18 1978-06-25 Пензенский Политехнический Институт Safety reducing valve
DE3239931A1 (en) * 1982-10-28 1984-05-03 Rexroth Mannesmann Gmbh Pressure valve, especially a pressure-limiting valve, pressure-reducing valve or the like
US7225830B1 (en) * 2005-02-09 2007-06-05 Kershaw Charles H Fluid control valve
CN1699808A (en) * 2005-06-20 2005-11-23 浙江大学 Slide valve type pilot ultra-high pressure pneumatic proportional pressure-reducing valve
CN201269336Y (en) * 2008-07-18 2009-07-08 宁波星箭航天机械厂 Gas pressure reducing valve
CN201288869Y (en) * 2008-10-28 2009-08-12 上海立新液压有限公司 Balance control valve
CN201284857Y (en) * 2008-10-31 2009-08-05 徐州重型机械有限公司 Balance valve
CN201747984U (en) * 2010-06-25 2011-02-16 徐州徐工挖掘机械有限公司 Throttling and reducing integrated valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103122880A (en) * 2011-11-18 2013-05-29 广西柳工机械股份有限公司 Adjustable pilot reducing valve
CN103122880B (en) * 2011-11-18 2016-05-04 广西柳工机械股份有限公司 Adjustable pilot-operated pressure-reducing valve
CN103470562A (en) * 2013-09-06 2013-12-25 鞍钢股份有限公司 High-frequency counterbalance valve and counterbalancing method thereof
CN104455472A (en) * 2014-10-24 2015-03-25 中国工程物理研究院化工材料研究所 Charging-discharging valve
CN105605254A (en) * 2016-03-18 2016-05-25 中国船舶重工集团公司第七0四研究所 Supplement load type high-pressure air safety valve with buffering on-off function
CN106122152A (en) * 2016-08-31 2016-11-16 山东泰丰液压股份有限公司 Ultra high pressure control valve

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