CN2283160Y

CN2283160Y - Electric or hydraulic operated change valve

Info

Publication number: CN2283160Y
Application number: CN 96239258
Authority: CN
Inventors: 闫学富
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-28
Filing date: 1996-11-28
Publication date: 1998-06-03
Anticipated expiration: 2006-11-28

Abstract

The utility model comprises a valve body 1, electromagnets 2 and 2', two pilot valves 3 and 3', a hydraulic operated slide valve 5, and a hydraulic control one-way valve 4. The utility model has the technical proposal that the pilot valves 3 and 3' are composed of two-position three-way Y-shaped normally closed ball valve reversing valves, a control oil chamber 3A of the two pilot valves 3 and 3' is communicated with control oil chambers 5A and 5A' at both ends of the hydraulic operated slide valve 5, and electrohydraulic operated control of the slide valve is carried out. A pilot control oil duct of the utility model is independently composed of two-position three-way Y-shaped ball valves, the structure is not provided with needle valves or orifices, and thus the utility model has the advantage of little possibility of clogging, fast reversing response speed, and small leakage quantity.

Description

Electro-hydraulic directional valve

The utility model relates to the electro-hydraulic directional valve device, particularly be applied to the electro-hydraulic directional valve sheet of electromagnetism multiple directional control valve.

Selector valve (the 3POSITION of the MC34X type 3-position 4-way leading type band Pilot operated check valve that U.S. CONTROL CONCEPTS company produces, 4WILOT OPERATED SPOOL VALVE WITH PILOT OPERATED CHECKS), it is a kind of electro-hydraulic directional valve sheet of 3-position 4-way band Pilot operated check valve, its structure constitutes as shown in Figure 1, by valve body, electromagnet, two pilot valve a, guiding valve b surges, double hydraulic control one-way valve c constitutes, electromagnet is a wet type pulling force valve control electromagnet, two pilot valve a are normal close type 2/2-way needle-valves, its needle is contained on the armature, be subjected to spring thrust needle point sealing valve port, its valve seat is contained in the valve of electromagnet magnetic conductive tube lower end and valve body, the needle valve seat epicoele communicates with high pressure oilhole P, and the needle valve seat cavity of resorption communicates with the control chamber of guiding valve b one end that surges.As the guiding valve b that surges of main valve is the 3-position 4-way guiding valve that surges, the guiding valve b spool that surges aligns the neutral position by two return springs and locating stop piece, when the guiding valve b that surges is in the neutral position, the control oil pocket and the high-voltage oil cavity on the pilot valve at guiding valve b spool two ends of surging sealed by pilot valve a, the high-voltage oil cavity that surges on the guiding valve b spool is in sealing, two oil back chambers of its both sides communicate with the oil return inlet T on the valve body, two oil back chambers communicate by the oil pocket of the oil transportation hole on the valve body with double hydraulic control one-way valve c plunger two ends, and the two ends of the guiding valve b spool that surges respectively are provided with a very little throttle orifice b1 makes the control chamber of its end communicate with spill port; Its throttle orifice b1 and pilot valve a constitute guide's control oil channel jointly, when two pilot valve a seal when two electromagnet all do not have electricity, throttle orifice b1 communicates the guiding valve b two ends control oil pocket that surges with oil return inlet T, make the guiding valve b spool pressure at two ends balance of surging guarantee centering; When getting as the left end electromagnet that left end pilot valve a needle platform plays conducting when electric, pressure oil p enters the guiding valve b left end control oil pocket that surges, the promotion guiding valve b spool that surges moves right, and right-hand member pilot valve a is sealing the guiding valve b right-hand member control oil pocket that surges, and this moment, throttle orifice b1 was the unique passage of control oil pocket oil extraction of guiding valve b right-hand member of surging.The promptly two hydraulic lock of double hydraulic control one-way valve c are made up of hydraulic control plunger and two one-way valves, the valve seat of its one-way valve is that conical surface cooperates with spool, two output oil ports of guiding valve b of surging communicate with the oil pocket at the hydraulic control plunger two ends of double hydraulic control one-way valve c respectively, in all communicate again with oil return inlet T immediately, hydraulic control plunger pressure at two ends balance, the hydraulic control plunger floats, the working position of two one-way valves sealing locking hydraulic jack K.The shortcoming of this electro-hydraulic directional valve sheet is a complex structure, processing technology is big than component difficulty, the requirement on machining accuracy height, because it structurally has very little needle-valve in duct and throttle orifice, so guaranteeing to guarantee its proper functioning under the very clean situation of fluid, if oil cleanliness is not enough, be easy to produce obstruction, particularly the throttle orifice b1 on the plugging fluid movable pulley b, and make valve malfunctioning.In addition, so because very little its of throttle orifice influences the commutating speed of guiding valve b, and speed of response is slower, and throttle orifice increased the leakage rate of the guiding valve b that surges greatly, and when working pressure was 21MPa, leakage rate reached 164CC/min, so prior art is not into to think.

The purpose of this utility model is to improve at the shortcoming deficiency of prior art, provides a kind of simple in structure, and production technology is good, and volume is little, functional reliability height, the strong electro-hydraulic directional valve of anti-hydraulic oil liquid pollution capacity.

The utility model includes valve body, electromagnet, two pilot valves, surge guiding valve and Pilot operated check valve constitutes, its major technology solution is that pilot valve is to be made of two-position three way Y type normally-closed ball valve selector valve, this two-position three way Y type normally-closed ball valve formula pilot valve is the two-position three way Y type normally-closed ball valve formula selector valve that is made of two steel balls by this thimble rod transmission interlock that place thimble rod two ends, the inboard cavity of two ball correspondences is the control oil pocket, outside cavity is respectively high pressure oil suction chamber and low pressure oil back chamber, the high-voltage oil cavity of two-position three way normally-closed ball valve selector valve is normally closed by ball valve, oil back chamber is often linked up with the control oil pocket, the control oil pocket of two two-position three way normally-closed ball valve formula pilot valves is promptly controlled oil pocket with the oil pocket at the guiding valve two ends of surging respectively and is interlinked, guide's control oil channel of Gou Chenging like this, when electromagnet does not have electricity, the control oil pocket at the guiding valve two ends of surging is all directly linked up with oil return, the surge pressure at two ends balance of valve core of the spool valve, the valve core of the spool valve that surges is in initial position or neutral position.This guide's control oil channel independently is made of two-position three way Y type ball valve, does not have needle-valve on the structure, does not also have throttle orifice, stops up so be not easy to produce, and the commutation speed of response is fast, and leakage rate is little.

Fig. 1 is a prior art U.S. MC34X electromagnetic valve structure schematic representation.

Fig. 2 is the hydraulic pressure graphic symbol of Fig. 1.

Fig. 3, the 4th, the utility model embodiment hydraulic work schematic diagram.

Fig. 5 is the utility model example structure schematic representation.

Fig. 6 is the I enlarged view of Fig. 5, promptly is two-position three way normally-closed ball valve formula pilot valve 3 structural representations.

Fig. 7 is the hydraulic pressure graphic symbol of Fig. 5.

Fig. 8 is the utility model example structure schematic diagram.

Fig. 9 is the hydraulic pressure graphic symbol of Fig. 8.

Figure 10 is the utility model example structure schematic diagram.

Figure 11 is the hydraulic pressure graphic symbol of Figure 10.

The utility model is described in further detail below in conjunction with accompanying drawing.

The utility model includes valve body 1, electromagnet 2,2 ', two pilot valves 3,3 ', surge guiding valve 5 and Pilot operated check valve 4 constitutes, technical characteristics is that pilot valve 3/3 ' is to be made of two-position three way Y type normally-closed ball valve selector valve, this two-position three way Y type normally-closed ball valve formula pilot valve 3/3 ' is by two balls 32 by this thimble rod 35 transmissions interlock that place a thimble rod 35 two ends, the 33 two-position three way Y type normally-closed ball valve formula selector valves that constitute, two ball valve steel balls 32, the inboard cavity of 33 correspondences is control oil pocket 3A, outside cavity is respectively high pressure oil suction chamber 3P and low pressure oil back chamber 3T, high pressure oil suction chamber 3P and low pressure oil back chamber 3T respectively with valve body 1 on the high pressure oilhole P and the spill port T that offer interlink, two-position three way normally-closed ball valve selector valve 3,3 ' high-voltage oil cavity 3P is normally closed by ball valve 33, oil back chamber 3T opens normal open with the ball valve 32 of control oil pocket 3A, two two-position three way normally-closed ball valve formula pilot valves 3,3 ' control oil pocket 3A is the oil transportation hole C1 by offering on the valve body 1 respectively "; C2 is " with the control oil pocket 5A at guiding valve 5 two ends of surging, 5A ' interlinks, guide's control oil channel of Gou Chenging like this, when two electromagnet 2,2 ' does not all have when electric, the control oil pocket 5A at spool 50 two ends of guiding valve 5 surges, 5A ' communicates with oil return T, the surge pressure at two ends balance of valve core of the spool valve 50, the valve core of the spool valve 50 that surges is in the neutral position; When the electromagnet 2 in left side when electric the high-voltage oil cavity 3P ball valve 33 of its corresponding two-position three way normally-closed ball valve formula pilot valve 3 be opened, high-voltage oil cavity 3P communicates with control oil pocket 3A, oil back chamber 3T ball valve 32 is closed simultaneously, control oil pocket 3A and oil back chamber 3T cut off, high pressure oil is by the control oil pocket 3A and the oil transportation hole C1 of two-position three way normally-closed ball valve formula pilot valve 3 " to be entered in the control oil pocket 5A of guiding valve 5 spools 50 left ends that surge; the valve core of the spool valve 50 that promotes to surge moves right; the guiding valve 5 that surges carries out the oil circuit commutation work that himself is controlled, and the fluid among the control oil pocket 5A ' of valve core of the spool valve 50 right-hand members that surge simultaneously is by oil transportation hole C2 " with the control oil pocket 3A of another pilot valve 3 ', oil back chamber 3T carries out oil return; When another electromagnet 2 ' when electric, working procedure commutates with above-mentioned working procedure symmetry.

Shown in accompanying drawing 6, the utility model two-position three way normally-closed ball valve formula pilot valve 3/3 ' is by spool 31,

steel ball

32,33, ball seat 34, thimble rod 35, spring 36 and push rod 38 constitute, spool 31 shapes are trapezoidal, be inserted in the plug-in opening of offering in the valve body 1, be provided with seal ring on the spool 31 and between valve body 1 plug-in mounting hole wall---

rubber seal

37,37 ', 37 "; the end of the exterior edge face of the promptly close valve body 1 in the upper end of spool 31 connects with valve body 1 plug-in opening screw-thread fit; thimble rod 35 is slidingly installed with spool 31 on the central position in spool 31 bodies; the two end part of corresponding thimble rod 35 offer control oil pocket 3A on spool 1; two-part of this control oil pocket 3A are interlinked by the through hole 3A ' that offers on the spool 31; ball

valve steel ball

32,33 place the two end part of thimble rod 35 respectively, the port of control oil pocket 3A, and cooperate with the port of control oil pocket 3A, corresponding ball valve steel ball 32 is offered oil back chamber 3T on spool 31, the spill port T that offers on this oil back chamber 3T and the valve body 1 interlinks, and carry out valve with control oil pocket 3A by steel ball 32 and cut off, it promptly also is in the high-voltage oil cavity 3P that ball seat 34 and spring 36 place the bottom outlet portion of lower end valve body 1 plug-in opening of spool 31, the high pressure oilhole P that offers on high-voltage oil cavity 3P and the valve body 1 interlinks, steel ball 36 promptly illustrates lower end mouth by ball seat 34 and spring 36 supporting roof pressures with the another port of control oil pocket 3A and cooperates, to control oil pocket 3A and high-voltage oil cavity 3P normal closed gate cuts off, steel ball 33 ejection thimble rods 35 are opened steel ball 32 ball valves simultaneously, control oil pocket 3A is linked up mutually with oil back chamber 3T, electromagnet 2,2 ' the corresponding two-position three way normally-closed ball valve selector valve 3,3 ' is fixedly connected is installed on the valve body 1, its armature promotes steel ball 32 by push rod 33 controls that are slidingly mounted in spool 1 sliding sleeve 31 ', thimble rod 35, steel ball 33 interlocks, when electromagnet does not have electricity, control chamber 3A and oil back chamber 3T are often linked up, control chamber 3A and high-voltage oil cavity 3P are normally closed, when electromagnet gets when electric, armature promotes steel ball 32 by push rod 38, thimble rod 35, steel ball 33 interlocks, control chamber 3A and oil back chamber 3T are closed, and control chamber 3A and high-voltage oil cavity 3P are open-minded.

Shown in implementing referring to accompanying

drawing

3,4,5,7, its guiding valve 5 that surges of the utility model is the 3-position 4-way y-function guiding valve that surges, and can have double hydraulic control one-way valve 4; Two two-position three way normally-closed ball valve formula pilot valves 3,3 ' control oil pocket 3A control oil pocket 5A, the 5A ' at the oil transportation hole C1 by offering on the valve body 1 ", C2 " and guiding valve 5 two ends of surging respectively interlink; The 3-position 4-way y-function surge the functional structure of guiding valve 5 be determine known, two oil back chamber 5T on guiding valve 5 spools 50 surge, the spill port T that offers on 5T ' and the valve body 1 interlinks, when being in the neutral position, guiding valve 5 spools 50 that surge work as electromagnet 2,2 ' all do not have the electricity operating mode the time, the high-voltage oil cavity 5P that the high pressure oil inlet hole P with on the valve body 1 that the valve core of the spool valve 50 that surges seals its middle part interlinks, the oil pocket 40 ' at hydraulic control plunger 40 two ends of double hydraulic control one-

way valve

4,40 " respectively with two oil back chamber 5T of the valve core of the spool valve 50 that surges; the oil transportation hole C1 ' of 5T ' by offering on the valve body 1; C2 ' interlinks; make the oil pocket 40 ' at hydraulic control plunger 40 two ends of double hydraulic control one-way valve 4; 40 is " respectively through oil transportation hole C1 ', C2 ', two oil back chamber 5T of guiding valve 5 spools 50 surge, 5T ' links up spill port T, the pressure at two ends balance of the hydraulic control plunger 40 of double hydraulic control one-way valve 4, double hydraulic control one-way valve plunger 40 also is in the neutral position, the oil transportation hole C1 of two logical hydraulic jack K of double hydraulic control one-way valve 4, C2 is by the one-way valve 47 at hydraulic control plunger 40 two ends, 47 ' sealing makes the hydraulic jack K can not oil return and be in blocked halted state; When left side electromagnet 2 when electric, its corresponding two-position three way normally-closed ball valve formula pilot valve 3 high-voltage oil cavity 3P ball valves 33 are opened, high pressure oil is by the control oil pocket 3A of pilot valve 3, in oil transportation hole C1 " enters in the control oil pocket 5A ' of guiding valve 5 spools 50 left ends that surge; the valve core of the spool valve 50 that promotes to surge moves right; the oil back chamber 5T ' of valve core of the spool valve 50 right-hand members that surge and its oil transportation hole, right side C2 ' are cut off; the high-voltage oil cavity 5P at valve core of the spool valve 50 middle parts of surging and oil transportation hole C2 ' connect; pressure oil enters the oil pocket 40 of double hydraulic control one-way valve 4 hydraulic control plungers 40 right-hand members ", back down fluid-control one-way 47 ' and enter hydraulic jack K through oil transportation hole C2, the double hydraulic control of pressure oil promotion simultaneously one-way valve plunger 40 is moved to the left the Pilot operated check valve 47 that backs down the other end makes the fluid in another chamber of hydraulic jack K through oil transportation hole C1 ', the oil back chamber 5T of valve core of the spool valve 50 left ends of surging carries out oil return; When right side electromagnet 2 ' when electric, working procedure commutates with above-mentioned symmetry.The selector valve of this function is applicable to the occasion use that requires hydraulic jack K to float when not having double hydraulic control one-way valve 4, be applicable to when having double hydraulic control one-way valve 4 to require the motionless occasion of locking to use to the oil cylinder working position.Double hydraulic control one-way valve 4 is ball-valve type double hydraulic control one-way valve preferably, promptly is by hydraulic control plunger 40, push rod 49,49 ', valve seat 48,48 ', steel ball 47,47 ', ball seat 46,46 ', spring 45,45 ' pressure cap 44,44 ' the ball-valve type double hydraulic control one-way valve that constitutes.If the utility model blocks the oil transportation mouth C1/C2 of double hydraulic control one-way valve 4 one ends, this valve block then becomes 3-position-3-way electromagnetism Reversing valve plate with lock, and it is used to control single oil cylinder is piston type cylinder.

Its guiding valve 5 of surging is the 3-position 4-way O type function guiding valve that surges referring to the utility model shown in attached 8,9 embodiments of figure, and two two-position three way normally-closed ball valve formula pilot valves 3,3 ' control oil pocket 3A divide then by the oil transportation hole C1 that offers on the valve body 1 ", C2 " and control oil pocket 5A, the 5A ' at guiding valve 5 two ends of surging and interlink; The functional structure of 3-position 4-way O type function hydraulic efficiency slide valve 5 is known fixed structures really, omit its functional structure formation and working procedure description at this, when electromagnet 2,2 ' did not all have the operating mode of electricity, valve core of the spool valve 50 its all oilholes of sealing that surge were high pressure, two oil returns, two working oil chambers when guiding valve 5 spools 50 that surge are in the neutral position for it.The selector valve of this function is applicable to the undemanding occasion of hydraulic jack Location accuracy.

Its guiding valve 5 guiding valve that surges that surges referring to the utility model shown in accompanying drawing 10,11 embodiments for bi-bit bi-pass band location function, the steel ball locate mode bi-bit bi-pass guiding valve that surges particularly, two two-position three way normally-closed ball valve formula pilot valves 3,3 ' control oil pocket 3A control oil pocket 5A, the 5A ' at the oil transportation hole C1 by offering on the valve body 1 ", C2 " and guiding valve 5 two ends of surging respectively interlink; The functional structure of bi-bit bi-pass hydraulic efficiency slide valve 5 is known fixed structures really, omit its functional structure at this and constitute description, when it does not all have the operating mode of electricity when electromagnet 2,2 ', guiding valve 5 spools 50 that surge are in the position that left end or right-hand member are positioned, when a certain electromagnet gets when electric, guiding valve 5 spools 50 that surge move commutation to the other end, moving commutation back electromagnetism electricity can cut off the power supply, spool 50 can keep locating motionless, and the switch selector valve of this function is applicable to controls application to long oil hydraulic motor of operating time.

Its guiding valve 5 also guiding valve that surges of other functional structure type certainly that surges of the utility model.

The utility model structure is the plug-in mounting connecting structure, two-position three way normally-closed ball valve selector valve 3,3 ' spool 31 structures are trapezoidal and are convenient to processing, assembling and boring and offer each oil duct lumen pore, can be according to the system pressure size, change push rod 38 length adjustment electromagnet shafts to mobile space, guarantee electromagnet thrust

The utility model, not being only applicable to machine tool hydraulic controls automatically, and can be applicable to that especially outdoor mobile working machinery such as engineering machinery equipment uses, its advantage is that volume is little, simple in structure, process easyly, do not have very little needle-valve in duct and throttle orifice on the structure, so under the not really clean situation of hydraulic oil liquid, also can guarantee its proper functioning, as long as oil pump energy proper functioning, this valve is the energy reliable operation just, and anti-hydraulic oil liquid pollution capacity is stronger, be not easy to produce and stop up, the functional reliability height, the life-span is long, and because electromagnet directly promotes two-position three way normally-closed ball valve selector valve 3,3 ' steel ball commutation, the stroke of steel ball and electromagnet is very little, electromagnet thrust is big, reliable in action, and speed of response is fast.

Claims

1, electro-hydraulic directional valve includes valve body (1), electromagnet (2,2 '), two pilot valves (3,3 '), surge guiding valve (5) and Pilot operated check valve (4) constitutes, it is characterized in that: pilot valve (3/3 ') is to be made of two-position three way Y type normally-closed ball valve selector valve, this two-position three way Y type normally-closed ball valve formula pilot valve (3/3 ') is by two steel balls (32 by this thimble rod (35) transmission interlock that place a thimble rod (35) two ends, 33) the two-position three way Y type normally-closed ball valve formula selector valve of Gou Chenging, two ball valve steel balls (32,33) Dui Ying inboard cavity is control oil pocket (3A), outside cavity is respectively high pressure oil suction chamber (3P) and low pressure oil back chamber (3T), high pressure oil suction chamber (3P) and low pressure oil back chamber (3T) respectively with valve body (1) on high pressure oilhole (P) and the spill port (T) offered interlink, two-position three way normally-closed ball valve selector valve (3,3 ') high-voltage oil cavity (3P) normally closed by ball valve (33), oil back chamber (3T) is opened normal open, two two-position three way normally-closed ball valve formula pilot valves (3 with the ball valve (32) of control oil pocket (3A), 3 ') control oil pocket (3A) respectively the oil transportation hole by offering on the valve body (1) (C1 "; the control oil pocket (5A at C2 ") and guiding valve (5) two ends of surging, 5A ') interlinks.

2, the described electro-hydraulic directional valve of root a tree name claim 1 is characterized in that: two-position three way Y type normally-closed ball valve formula pilot valve (3/3 ') is to be made of spool (31), steel ball (32,33), ball seat (34), thimble rod (35), spring (36) and push rod (38); Spool (31) shape is trapezoidal, be inserted in the plug-in opening of offering in the valve body (1), upward and between valve body (1) plug-in mounting hole wall be provided with seal ring at spool (31)---rubber seal (37,37 ', 37 "); the upper end of spool (31) promptly connects with valve body (1) plug-in opening screw-thread fit near the end of the exterior edge face of valve body (1); thimble rod (35) is slidingly installed with spool (31) on the central position in spool (31) body; the two end part of corresponding thimble rod (35) interlink offering the through hole (3A ') that two-part of controlling this control oil pocket (3A) of oil pocket (3A) offer on by spool (31) on the spool (1); ball valve steel ball (32; 33) places the two end part of thimble rod (35) respectively, the port of control oil pocket (3A), and with control oil pocket (3A) port cooperate, corresponding ball valve steel ball (32) is offered oil back chamber (3T) on spool (31), the spill port of offering on this oil back chamber (3T) and the valve body (1) (T) interlinks, and carry out valve with control oil pocket (3A) by steel ball (32) and cut off, it promptly also is in the high-voltage oil cavity (3P) that ball seat (34) and spring (36) place the bottom outlet portion of lower end valve body (1) plug-in opening of spool (31), the high pressure oilhole of offering on high-voltage oil cavity (3P) and the valve body (1) (P) interlinks, steel ball (33) is cooperated with the another port of control oil pocket (3A) by ball seat (34) and spring (36) supporting roof pressure, to control oil pocket (3A) cuts off with high-voltage oil cavity (3P) normal closed gate, steel ball (33) ejection thimble rod (35) is opened steel ball (32) ball valve simultaneously, and control oil pocket (3A) is linked up mutually with oil back chamber (3T); The corresponding two-position three way normally-closed ball valve selector valve (3 of electromagnet (2,2 '), 3 ') being fixedly connected is installed on the valve body (1), its armature promotes steel ball (32), thimble rod (35), steel ball (33) interlock by push rod (38) control that is slidingly mounted in spool (1) sliding sleeve (31 ').

3, root a tree name claim 1 or 2 described electro-hydraulic directional valves, it is characterized in that: the guiding valve that surges (5) is the 3-position 4-way y-function guiding valve that surges, and the control oil pocket (3A) of two two-position three way normally-closed ball valve formula pilot valves (3,3 ') the control oil pocket (5A, 5A ') at the oil transportation hole by offering on the valve body (1) (C1 ", C2 ") and guiding valve (5) two ends of surging respectively interlinks.

4, root a tree name claim 1 or 2 described electro-hydraulic directional valves is characterized in that: the guiding valve that surges (5) is the 3-position 4-way y-function guiding valve that surges, and has double hydraulic control one-way valve (4); The control oil pocket (3A) of two two-position three way normally-closed ball valve formula pilot valves (3,3 ') the control oil pocket (5A, 5A ') at the oil transportation hole by offering on the valve body (1) (C1 ", C2 ") and guiding valve (5) two ends of surging respectively interlinks, the oil pocket at hydraulic control plunger (40) two ends of double hydraulic control one-way valve (4) (40 ', 40 ") interlink with oil transportation hole by offering on the valve body 1 of two oil back chambers (5T, 5T ') of the valve core of the spool valve that surges (50) (C1 ', C2 ') respectively; Double hydraulic control one-way valve (4) is a ball-valve type double hydraulic control one-way valve, promptly is the ball-valve type double hydraulic control one-way valve that is made of hydraulic control plunger (40), push rod (49,49 '), valve seat (48,48 '), steel ball (47,47 '), ball seat (46,46 '), spring (45,45 '), pressure cap (44,44 ').

5, root a tree name claim 1 or 2 described electro-hydraulic directional valves, it is characterized in that: the guiding valve that surges (5) is the 3-position 4-way O type function guiding valve that surges, and the control oil pocket (3A) of two two-position three way normally-closed ball valve formula pilot valves (3,3 ') the oil transportation hole by offering on the valve body (1) (C1 ", C2 ") and the control oil pocket (5A, 5A ') at guiding valve (5) two ends of surging respectively interlinks.

6, root a tree name claim 1 or 2 described electro-hydraulic directional valves, it is characterized in that: the guiding valve that surges (5) is the guiding valve that surges of bi-bit bi-pass band location function, the steel ball locate mode bi-bit bi-pass guiding valve that surges particularly, the control oil pocket (3A) of two two-position three way normally-closed ball valve formula pilot valves (3,3 ') the control oil pocket (5A, 5A ') at the oil transportation hole by offering on the valve body (1) (C1 ", C2 ") and guiding valve (5) two ends of surging respectively interlink.