CN206092566U - Direct action type 2D electro -hydraulic pressure servo valve - Google Patents

Abstract

The utility model relates to a direct action type 2D electro -hydraulic pressure servo valve. Its characterized in that comprises valve body module, electromechanical converter module, drive mechanism module and displacement sensor module, and the displacement sensor module cooperatees with the valve body module, and the electromechanical converter module cooperatees through drive mechanism module and valve body module, the displacement of 2D piston and the rotary electromagnet signal of telecommunication of electromechanical converter module constitute the closed loop feedback in the displacement sensor module real -time supervision valve body module. The utility model discloses a control rotary electromagnet's deflection angle changes the axial displacement distance of case, and then the size that changes the spring force comes adjustment system's pressure, has structurally simplified original two -stage or multiple -order structural style greatly, accords with the simple compact requirement of trade.

Description

Direct Action Type 2D Electric hydraulic pressure servo valve

Technical field

The utility model belongs to Fluid-transmission and the electrohydraulic servo valve in control field, more particularly to a kind of Direct Action Type 2D electricity Hydraulic coupling servo valve.

Background technology

Electro-hydraulic servo control technology has organically combined the advantage of Fluid-transmission control technology and information electronic technology, with work( The advantages of rate amplifies continuous double-direction control that is high, responding little fast, dead band, achievable output flow and pressure, in Aero-Space, point The important national strategy army industrial circles such as end weapon, iron and steel, power generation are used widely.Electric hydraulic pressure servo valve is An important and preferable servoelement in Force control system, it is to receive analog quantity electric control signal, and output pressure is with automatically controlled The hydraulic control valve of signal magnitude processed and change in polarity and quick response, with small volume, inertia is little, response is fast, sensitivity is high Etc. advantage, should in Material Testing Machine, fatigue test of structure machine, aircraft hydraulic control system of vehicle and ship steering engine control system With extensive.

At present Electric hydraulic pressure servo valve is mainly based on nozzle baffle type and jet pipe type pressure servo valve two types, but Technology mostly is external monopolization；The widest pressure servo valve of domestic application is mainly two-stage or three-level Electric hydraulic pressure servo valve, this The function admirable of a little servo valves, but it is extremely complex in structure, and manufacture is difficult, and use condition is also rather harsh, to fluid Cleannes requirement is higher, and fault rate is higher.

Due to the various deficiencies of pressure servo valve, the not high occasion of required precision in actual production, usually electricity consumption liquor ratio Example pressure control valve, such as electro-hydraulic proportional reducing valve, overflow valve, using Linear displacement transducer（LVDT）Spool position is entered Row measurement and closed-loop control, constitute electric feedback-type direct acting proportional pressure control valve, can to a great extent improve determining for valve element The control accuracy of position rigidity and power output, for replacing Electric hydraulic pressure servo valve to realize the control to system force, but control accuracy Slightly show inferior.

Utility model content

For problems of the prior art, the purpose of this utility model is to provide a kind of Direct Action Type 2D electro-hydraulic pressure The technical scheme of servo valve, by the axial movement distance for controlling the deflection angle of rotary magnet to change 2D pistons, and then Change the size of spring force to adjust the pressure of system, original two-stage or multistage structure shape are enormously simplify in structure Formula, meets the simple compact requirement of industry.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that by valve body module, electromechanical transducer module, pass Dynamic mechanism module and displacement sensor module are constituted, and displacement sensor module is engaged with valve body module, electromechanical transducer Module is engaged by transmission mechanism module with valve body module；2D lives in institute's displacement sensor modules real-time monitoring valve body module The displacement of plug constitutes closed loop feedback with the rotary magnet electric signal of electromechanical transducer module.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the valve body module includes valve element, 2D pistons, bullet Spring and valve body, 2D pistons are arranged on the right side of valve body, and valve element is arranged on the left side of valve body, 2D pistons have in valve body rotation and Slide axially two directions of motion；2D piston one ends are provided with shoulder, coordinate on shoulder and are provided with a pair of pressure holes and a pair of low pressure Hole, a pair of pressure holes are communicated with oil-feed P mouths, and a pair of low pressure holes are communicated with fuel-displaced T mouths；Inner hole of cylinder wall in valve body is symmetrically opened up There are be engaged with the shoulder of 2D pistons a pair of a damping skewed slots, the shoulder of 2D pistons and cylinder barrel and be arranged on same on the right side of 2D pistons Left sensitive cavity and right sensitive cavity are formed between thimble, 2D pistons are installed in cylinder barrel, a pair of pressure holes on the shoulder of 2D pistons Four small aperture areas flowed friction half-bridge in series, control are crossed to form with a pair of low pressure holes and a pair of damping skewed slots Left sensitive cavity pressure change, right sensitive cavity connection oil-feed P mouths are the pressure controlled in hydraulic pressure of high pressure, left sensitive cavity and right sensitive cavity Resistance half-bridge, produced pressure differential drives 2D piston axially-movables；Valve element be provided with left part shoulder, right part shoulder and in Portion's shoulder, the left part shoulder correspondence oil-feed P mouths of valve element, middle part shoulder correspondence control A mouths, the fuel-displaced T mouths of right part shoulder correspondence, Left part shoulder, right part shoulder and middle part shoulder and valve body inner bore seal slidingly against cooperation；Set between valve element and 2D pistons Left pad and right pad are equipped with, spring is arranged between left pad and right pad, valve element right-hand member is contacted by steel ball with right pad Coordinate, 2D pistons left end is engaged by steel ball with left pad, and the axially-movable of 2D pistons can be converted to valve by spring The axially-movable of core.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the electromechanical transducer module includes phase interworking The rotary magnet of conjunction, connecting plate and electromagnet protective cover；The transmission mechanism module includes spring holding rod, electromagnet zero-bit Spring, spring shim, spring retainer, upper driving lever and lower shift fork, spring retainer is kept to be arranged on connecting plate, spring keeps The spring holding rod is set on frame, and socket on spring holding rod arranges electromagnet zero-bit and keeps spring and spring shim, upper to dial Bar one end connects the rotary shaft of rotary magnet, and upper driving lever other end clamping is arranged on spring holding rod and is located at spring shim Between spring retainer, upper driving lever can slide on spring holding rod；The one of upper driving lever connection rotary magnet rotary shaft End is set to oval outline, and the upper end of lower shift fork is engaged by clamping with oval outline, the lower end connection valve body of lower shift fork The 2D pistons of module.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that institute's displacement sensor modules include LVDT displacements Sensor, the sensor mandrel of LVDT displacement transducers is threaded connection bar and is connected with the 2D pistons of valve body module.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the valve body left end arranges a valve pocket, valve element peace Loaded in valve pocket, the spacer pin of one restriction valve element radial rotating is installed using interference fit in valve element right-hand member, spacer pin is in valve Slide in the U-type groove of set.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the valve body side arranges end cap, valve body is another Side arranges lid.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the valve element left side is set to collar plate shape structure, Squeeze film is formed when valve element is left and right mobile between the collar plate shape structure and valve body and valve pocket of valve element.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the upper end of the lower shift fork is the U of opening upwards Shape is pitched, and U-shaped fork is engaged by clamping with oval outline.

Described Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that the LVDT displacement transducers are arranged on sensor On support.

The beneficial effects of the utility model are mainly manifested in：

1st, for the deficiency of existing Electric hydraulic pressure servo valve contamination resistance difference, 2D spiral servos and pressure servo are controlled Technology combines, and constitutes the advanced Direct Action Type 2D Electric hydraulic pressure servo valve of compact conformation, principle, simplifies the knot of pressure servo valve Structure, improves its contamination resistance；

2nd, buffer theory to design its valve core structure using squeeze film（Valve element left end sets up collar plate shape structure as damping Module）, during valve element is moved left and right, it is possible to increase system viscous damping, by improving system damping ratio stablizing for valve is ensured Performance；

3rd, using the axial displacement of LVDT displacement transducer real-time monitoring 2D pistons, with single direction rotation electromagnet electric signal shape Into closed loop feedback, the overall control precision and dynamic response capability of valve are improved；

4th, contacted by spring between 2D pistons and valve element, can both realize the transmission of power, can prevent pressure excessive again, Make the Force control system will not " locking ".

Description of the drawings

Fig. 1 is the structural representation of Direct Action Type 2D Electric hydraulic pressure servo valve；

Fig. 2 is the sectional view of valve body；

Fig. 3 is the structural representation of 2D pistons；

Fig. 4 is the valve core structure schematic diagram with damping disc buffer；

Fig. 5 is the side schematic view of connecting plate；

Fig. 6 is Direct Action Type 2D Electric hydraulic pressure servo valve operation principle schematic diagram.

Specific embodiment

The utility model is described further with reference to Figure of description：

A kind of reference picture 1- Fig. 6, Direct Action Type 2D Electric hydraulic pressure servo valve includes the first screw 1, the second screw 4, the 3rd spiral shell The 6, the 4th screw 12 of nail, the 5th screw 13, the 6th screw 14, the 7th screw 18, the 8th screw 21 and the 9th screw 25, an O Type sealing ring 2, the second O-ring seal 27, the 3rd O-ring seal 29, valve body 3, rotary magnet 5, connecting plate 7, spring keep Bar 8, electromagnet zero-bit keep spring 9, spring shim 10, spring retainer 11, upper driving lever 15, fastening steel ball 16, aviation socket 17th, lower shift fork 19, whorl brace rod 20, sensor mandrel 22, LVDT displacement transducers 23, sensor stand 24, lid 26, same Thimble 28, cylinder barrel 30,2D pistons 31, right pad 32, the first steel ball 33, the second steel ball 36, spring 34, left pad 35, spacer pin 37th, valve pocket 38, valve element 39, end cap 40.

Wherein, the connection end cap of the first screw 1 and valve body, the connection electromagnet protective cover of the second screw 4 and connecting plate 7, the 3rd Screw 6 connects rotary magnet and connecting plate 7, the connecting spring retainer 11 of the 4th screw 12 and connecting plate, and the 5th screw 13 connects Lid 26 and electromagnet protective cover are connect, the upper driving lever 15 of the locking of the 6th screw 14, the 7th screw 18 is used to be connected to aviation socket 7 On lid 26, the 8th screw 21 is used to lock lower shift fork 19, the connection lid of the 9th screw 25 and connecting plate；First O-ring seal 2 For end cover and valve body, the second O-ring seal 27 is used to sealing 2D pistons 31 and connecting plate 7, the 3rd O-ring seal 29, For sealed valve body 3 and connecting plate 7.These settings are conventional setting, will not be described here.

Direct Action Type 2D Electric hydraulic pressure servo valve of the present utility model, by valve body module, electromechanical transducer module, driver Structure module and displacement sensor module are constituted, and displacement sensor module is engaged the displacement of monitoring 2D pistons with valve body module, Electromechanical transducer module is engaged by transmission mechanism module with valve body module, and to 2D pistons rotation process is carried out；Displacement is passed The single direction rotation electromagnet telecommunications of the displacement of 2D pistons and electromechanical transducer module in sensor module real-time monitoring valve body module Number constitute closed loop feedback.

Valve body module includes valve element, 2D pistons, spring and valve body, and 2D pistons are arranged on the right side of valve body, and valve element is arranged on The left side of valve body, 2D pistons have rotation and two directions of motion that slide axially in valve body；2D piston one ends are provided with shoulder, On shoulder coordinate be provided with a pair of pressure hole b and a pair of low pressure holes c, a pair of pressure holes are communicated with oil-feed P mouths, a pair of low pressure holes with go out Oily T mouths are communicated, and wherein oil-feed P mouths are oil-ins, and pressure is system pressure at this, and fuel-displaced T mouths are oil return openings；Cylinder barrel in valve body Inner hole wall symmetrically offers a pair of damping skewed slots being engaged with the shoulder of 2D pistons（）, the shoulder and cylinder of 2D pistons Left sensitive cavity f and right sensitive cavity g are formed between cylinder and the concentric ring that is arranged on the right side of 2D pistons, 2D pistons are installed in cylinder barrel, A pair of pressure holes and a pair of low pressure holes on the shoulder of 2D pistons are crossed to form four small opening surfaces with a pair of damping skewed slots Product flowed friction half-bridge in series, controls left sensitive cavity pressure change, and right sensitive cavity connects oil-feed P mouths for high pressure, left sensitivity Chamber and right sensitive cavity it is pressure controlled in flowed friction half-bridge, produced pressure differential drives 2D piston axially-movables；On valve element It is provided with left part shoulder, right part shoulder and middle part shoulder, the left part shoulder correspondence oil-feed P mouths of valve element, middle part shoulder correspondence Control A mouths, the fuel-displaced T mouths of right part shoulder correspondence, left part shoulder, right part shoulder and middle part shoulder and valve body inner bore are slidably Ground sealing coordinates；When 2D pistons are rotated clockwise（Eye left from transmission mechanism side）, pressure hole intersects with damping skewed slot Area reduces, and trough intersects area increase with damping skewed slot, and now left sensitive cavity pressure reduces, and right sensitive cavity pressure is not Become, 2D pistons are moved to left.During moving to left, pressure hole intersects area increase, trough and damping skewed slot with damping skewed slot Intersecting area reduces, and 2D pistons are finally stablized in a certain position, now both sides width between pressure hole, low pressure hole and damping skewed slot Unequal, 2D pistons produce a power to the left, and the power is acted on spring, is compressed spring.The spring force finally with The power that control A mouth pressure is acted on the left of valve element balances each other.

Cylinder barrel 30 is abutted against at the shoulder inside valve body 3, and fastening steel ball 16 is pressed on cylinder barrel by valve inner chute Valve inner, and prevent it from producing radial rotating；Left pad and right pad are provided between valve element and 2D pistons, spring is arranged on Between left pad and right pad, valve element right-hand member is engaged by the second steel ball 36 and right pad, and 2D pistons left end passes through first Steel ball 33 is engaged with left pad, and the axially-movable of 2D pistons can be converted to the axially-movable of valve element by spring.

Initial time, the right-hand member of right pad 32 is close on cylinder barrel 30, and the left end of right pad 32 contacts with spring 34；Valve Set 38 is installed on the left end of valve body 3 using interference fit, and valve element 39 is installed in valve pocket 38, is pacified using interference fit in valve element right-hand member A spacer pin 37 is filled, spacer pin slides in the U-type groove of valve pocket, limit valve element radial rotating, reduced because mismachining tolerance causes Pressure oscillation.

As shown in figure 4, the left side of valve element 39 is set to collar plate shape structure, and when valve element is left and right mobile, the collar plate shape knot of valve element Squeeze film is formed between structure and valve body and valve pocket, its effect is, in order to introduce squeeze film damped coefficient, to increase system viscosity Damping, improving damping ratio makes the effect of system stability.

As shown in figure 5, transmission mechanism module includes that spring holding rod, electromagnet zero-bit keep spring, spring shim, spring Retainer, upper driving lever and lower shift fork, spring retainer is arranged on connecting plate, the spring is arranged on spring retainer and is kept Bar, socket on spring holding rod arranges electromagnet zero-bit and keeps spring and spring shim, upper driving lever one end connection rotary magnet Rotary shaft, upper driving lever other end clamping be arranged on spring holding rod and be located between spring shim and spring retainer, on Driving lever can slide on spring holding rod.One end of upper driving lever connection rotary magnet rotary shaft is set to oval foreign steamer Exterior feature, the upper end of lower shift fork is engaged by clamping with oval outline, the 2D pistons of the lower end connection valve module of lower shift fork.

Specifically, the shifting block ovalize of upper driving lever lower half, the first half of lower shift fork is the U-shaped fork of opening upwards, on The shifting block of driving lever is plugged in the U-shaped of lower shift fork fork, and the rotary shaft of rotary magnet is fixedly connected with upper driving lever, is dialled with driving Bar drives lower shift fork to rotate, the 2D pistons of the lower end connection valve module of lower shift fork, to drive 2D piston synchronous to rotate；Upper driving lever Top be slidably disposed on spring holding rod, and one end of spring holding rod be arranged with by upper driving lever incline be pushed against down Electromagnet zero-bit in shift fork keeps spring.In order to improve the job stability of Direct Action Type 2D Electric hydraulic pressure servo valve, balance is used Property power, need to be by the center superposition of the center of gravity of the screw 14 of upper driving lever 15 and the 6th and the rotary shaft of rotary magnet 5, and 2D pistons 31 center overlaps with the center of gravity of the screw 21 of lower shift fork 19 and the 8th.

Electromechanical transducer module includes rotary magnet, connecting plate and the electromagnet protective cover for cooperating, electric rotating Magnet is located at the upper end of valve body 3, and rotary magnet is connected by the 3rd screw 6 with connecting plate 7, and electromagnet protective cover passes through second Screw 4 is connected with connecting plate 7, while lid 26 is connected on electromagnet protective cover by the 5th screw 13.

Displacement sensor module includes LVDT displacement transducers, and its function is the axial displacement of real-time monitoring 2D piston, and Closed loop feedback is formed with rotary magnet electric signal.The sensor mandrel 22 of LVDT displacement transducers be threaded connection bar 20 with 2D pistons 31 are connected, and are maintained at the centre position of the endoporus of LVDT displacement transducers 23, improve its accuracy.Sensor stand 24 It is arranged on connecting plate, between LVDT displacement transducers 23 and sensor stand 24 interference fit is adopted, in case pressure servo valve Produce between transport or vibrating state lower sensor and sensor stand and slide axially, affect its displacement detection precision.

The implementation principle of this example is：As shown in fig. 6, when 5 no power of rotary magnet, with turning for rotary magnet The upper end of upper driving lever 15 that moving axis is connected firmly abuts against at the shoulder of spring holding rod 8 in the presence of electromagnet zero-bit keeps spring 9, The remains stationary of lower shift fork 19, makes 2D pistons 31 be in zero-bit（Two sensitive cavities of 2D pistons or so are in stress balance state）.Just Begin the moment, oil-feed P mouths and control A mouths are obstructed at the shoulder of valve element left part, if P is communicated with A, then pressure oil enters valve element The sensitive cavity that internal gutter is further entered on the left of valve element, produces the power for promoting valve element to move right, now P mouths and A mouths Passage be closed, valve element all the time be in right position.When single direction rotation electromagnet 5 leads to forward current, upper driving lever 15 receives moment of face Rotate counterclockwise（See from right to left along connecting plate）, drive lower shift fork 19 to turn clockwise, while driving 2D piston dextrorotations Turn, so that low pressure hole c becomes big with damping skewed slot overlapping area, pressure hole b diminishes with damping skewed slot overlapping area, left sensitive cavity F pressure diminishes therewith, and right sensitive cavity pressure is constant, 2D pistons 31 under the sensitive cavity differential pressure action of left and right to left movement, to the left In mobile process, low pressure hole c is set to diminish with damping skewed slot overlapping area, pressure hole b becomes big with damping skewed slot overlapping area, left Sensitive cavity pressure gradually rises, and after in addition spring 34 is pressurized, a reaction force to the right is produced to 2D pistons 31, and 2D pistons stop A new equilbrium position；Power produced by after spring 34 is pressurized acts directly on the right-hand member of valve element 39, moves to left valve element, now P mouths are connected with A mouths, and A mouths are also what is connected with T mouths, are understood by changing the opening between P and A by Flow continuity equation Amount can just control A mouth pressure changes；The axial displacement of LVDT displacement transducer real-time monitorings 2D piston 31, and feed back to unidirectional rotation Turn electromagnet, form closed loop feedback, the displacement of precise control 2D piston 31, so as to the displacement of real-time adjustment valve element 39, reaches control A mouths The constant purpose of pressure.

Above-mentioned specific embodiment is used for explaining the utility model, rather than the utility model is limited, in this reality With any modifications and changes in new spirit and scope of the claims, made to the utility model, this is both fallen within The protection domain of utility model.

Claims (9)

1. Direct Action Type 2D Electric hydraulic pressure servo valve, it is characterised in that by valve body module, electromechanical transducer module, transmission mechanism mould Block and displacement sensor module are constituted, and displacement sensor module is engaged with valve body module, and electromechanical transducer module passes through Transmission mechanism module is engaged with valve body module；The displacement of 2D pistons in institute's displacement sensor modules real-time monitoring valve body module Closed loop feedback is constituted with the rotary magnet electric signal of electromechanical transducer module.

2. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 1, it is characterised in that the valve body module includes valve Core, 2D pistons, spring and valve body, 2D pistons are arranged on the right side of valve body, and valve element is arranged on the left side of valve body, and 2D pistons are in valve body In have rotation and two directions of motion that slide axially；2D piston one ends are provided with shoulder, coordinate on shoulder and are provided with a pair of high pressure Hole and a pair of low pressure holes, a pair of pressure holes are communicated with oil-feed P mouths, and a pair of low pressure holes are communicated with fuel-displaced T mouths；In cylinder barrel in valve body Hole wall symmetrically offers be engaged with the shoulder of 2D pistons a pair of damping skewed slots, the shoulder of 2D pistons and cylinder barrel and is arranged on 2D Left sensitive cavity and right sensitive cavity are formed between concentric ring on the right side of piston, 2D pistons are installed in cylinder barrel, on the shoulder of 2D pistons A pair of pressure holes and a pair of low pressure holes and a pair of damping skewed slots be crossed to form four small aperture areas hydraulic pressure in series Resistance half-bridge, controls left sensitive cavity pressure change, and right sensitive cavity connection oil-feed P mouths are high pressure, left sensitive cavity and right sensitive cavity It is pressure controlled in flowed friction half-bridge, produced pressure differential drives 2D piston axially-movables；Valve element be provided with left part shoulder, Right part shoulder and middle part shoulder, the left part shoulder correspondence oil-feed P mouths of valve element, middle part shoulder correspondence control A mouths, right part platform The fuel-displaced T mouths of shoulder correspondence, left part shoulder, right part shoulder and middle part shoulder and valve body inner bore seal slidingly against cooperation；Valve element Left pad and right pad are provided with and 2D pistons between, spring is arranged between left pad and right pad, valve element right-hand member passes through steel Ball is engaged with right pad, and 2D pistons left end is engaged by steel ball with left pad, and the axially-movable of 2D pistons can lead to Cross the axially-movable that spring is converted to valve element.

3. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 1, it is characterised in that the electromechanical transducer mould Block includes rotary magnet, connecting plate and the electromagnet protective cover for cooperating；The transmission mechanism module keeps including spring Bar, electromagnet zero-bit keep spring, spring shim, spring retainer, upper driving lever and lower shift fork, spring retainer to be arranged on connection On plate, the spring holding rod is set on spring retainer, on spring holding rod socket arrange electromagnet zero-bit keep spring and Spring shim, upper driving lever one end connects the rotary shaft of rotary magnet, and upper driving lever other end clamping is arranged on spring holding rod And between spring shim and spring retainer, upper driving lever can slide on spring holding rod；Upper driving lever connects electric rotating One end of magnet rotors axle is set to oval outline, and the upper end of lower shift fork is engaged by clamping with oval outline, lower shift fork Lower end connection valve module 2D pistons.

4. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 1, it is characterised in that institute's displacement sensor modules Including LVDT displacement transducers, the sensor mandrel of LVDT displacement transducers is threaded connection the 2D pistons of bar and valve body module It is connected.

5. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 2, it is characterised in that the valve body left end arranges Valve pocket, valve element is installed in valve pocket, and the spacer pin of a restriction valve element radial rotating is installed using interference fit in valve element right-hand member, Spacer pin slides in the U-type groove of valve pocket.

6. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 2, it is characterised in that the valve body side arranges end Lid, valve body opposite side arranges lid.

7. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 5, it is characterised in that the valve element left side is set to Collar plate shape structure, squeeze film is formed when valve element is left and right mobile between the collar plate shape structure and valve body and valve pocket of valve element.

8. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 3, it is characterised in that the upper end of the lower shift fork is The U-shaped fork of opening upwards, U-shaped fork is engaged by clamping with oval outline.

9. Direct Action Type 2D Electric hydraulic pressure servo valve according to claim 4, it is characterised in that the LVDT displacement transducers On sensor stand.