CN1141406A - Sliding type force-aid valve - Google Patents

Abstract

The present invention provides a sliding cylinder type booster valve which can make the switching force free from restraint of pipeline fluid pressure and can use the pipeline fluid pressure to make valve keep closed tendency. It is mainly characterized by that the sliding cylinder is used as switching component, and under the pressure of the fluid, the force borne by the sliding cylinder can be fully balanced, and the closing force of the sealing surface can be optionally designed. Said invention is applicable to fields of power and petrochemistry, in particular, under the conditions of high-temp. high-pressure and large bore can be used for switching and regulating operation. Said invention is simple in structure, easy to operate, low in flow resistance, non-leakage and has no need of casting process.

Description

Sliding type force-aid valve

The present invention proposes a kind of valve, and specifically a kind of switch force that can make is not retrained by the pipeline hydrodynamic pressure, can utilize pipeline fluid pressure to make valve keep the sliding type force-aid valve of the trend of closing again.

At present at high pressure, the valve of working under the environmental conditions of high temperature and high liquid speed and big latus rectum has gate valve, stop valve, telescopic modulating valve, these three kinds of valve mechanisms are three flange bodies, complex-shaped, need cast form, casting defect causes certain reject rate, machining also has more highly difficult, need concentricity and perpendicularity between each axis of assurance, often need the special purpose machine tool apparatus processing, wherein gate valve and stop valve valve plate or flap when opening just bearing huge hydrodynamic pressure, quite high contact stress causes between them and is inevitably pulled between valve plate or flap and the valve seat, scratch, let out thereby destroy to seal to cause in the valve, the switch force of gate valve and stop valve is directly proportional with valve inner fluid pressure medium, hydrodynamic pressure is high more, switch force is just big more, difficulty has just appearred in the manual control switch of valve when working pressure surpasses 8kg/cm2, have to adopt machinery, hydraulic pressure or power driving mechanism, gate valve, stop valve does not allow to regulate, know from experience serious erosion valve seat in the half-open position high speed flow, flap, telescopic modulating valve mostly is angle valve, have influence on that pipeline is installed and the size of valve fluid resistance, how undesirable close sealability.

The present invention seeks to propose a kind of valve that can under the environmental conditions of high pressure, high temperature, high liquid speed and big latus rectum, work, it is simple in structure, replacing foundry goods with drawn and rolled tube or forging is raw material, processing easily, but the stressed complete equilibrium of switch member slide cartridge under hydrodynamic pressure, the big I that sealing surface is closed power designs arbitrarily, and is easy to operate, the fluid resistance coefficient is less, promptly can work as switch valve and also can do the modulating valve use.

The present invention seeks to realize like this: it mainly comprises inlet flange, outlet(discharge) flange, spool, preceding slide cartridge, back slide cartridge, valve body, metallic seal piston ring, slide cartridge driving mechanism, because the ring cavity structure that slide cartridge and spool form, can make the ring cavity fluid pressure that the switch member slide cartridge is produced pressure balance, so just can under the condition that is not subjected to pipeline pressure influence, control slide cartridge and endwisely slip, finish the switch motion of valve.Below in conjunction with Fig. 1, Fig. 2 elaborates theory structure of the present invention: spool 3 is by partition, inlet duct, outer pipe and seal ring are welded to form, wherein cut off by two streamline hemispherical Shells on the metallic packing ring in the middle of being welded in, the inlet duct outer pipe is cylindrical shape, inlet duct is enclosed within on hemispherical Shell external welding seal ring one end, outer pipe is enclosed within on the other end of another hemispherical Shell external welding seal ring, nearly partition place inlet duct has the fluid passage window, nearly partition place outer pipe has the fluid flow regulation window, seal ring is a toroidal, sealing cone is slide cartridge 4 one sides after relatively, preceding slide cartridge 5 is one section thin one a section thick reducing drum, the reducing place is a taper barrel, and it is poor that the interior circle of the preceding slide cartridge 5 thin diameter section cylinders ring groove of having got on the bus, metallic seal piston ring 8 are put into piston ring, outside the inlet duct of preceding slide cartridge 5 thin diameter sections cover cartridge spool 3, there are two screws at symmetry place, preceding slide cartridge 5 wide section cylinders middle part, is used to install two slide cartridge thrust pin wheels 7, and preceding slide cartridge one week of 5 wide section cylinder end is uniform to be to connect the screw that the back slide cartridge is used, back slide cartridge 4 is a drum, back slide cartridge one end is the plane, and the other end is conical sealing surface, and back 4 outer one weeks of dome of slide cartridge are uniform for connecting the circular hole that preceding slide cartridge is used, the outer pipe cylindrical of spool 3 ring groove of having got on the bus, it is poor that metallic seal piston ring 8 is put into piston ring, and back slide cartridge 4 is sleeved on outside the outer pipe of spool 3, and the cylinder of preceding slide cartridge 5 is than butt end and slide cartridge 4 usefulness round platform rank, back overlap joint, locating stud is fixed, sealed with sealing gasket and bolt, preceding like this slide cartridge 5 and back slide cartridge 4 form the slide cartridge of entities, preceding slide cartridge 5, back slide cartridge 4 separates with extraneous sealing with the ring cavity that spool 3 forms, during valve working, the window of fluid on spool 3 inlet ducts enters ring cavity, flowed out from the adjusting window on spool 3 outer pipes by ring cavity again, and preceding slide cartridge 5 does not hide the inlet window of spool 3 upper inlet pipes all the time, slide cartridge can be free to slide at spool 3, when slide cartridge was in axial sliding, back slide cartridge 4 hid or opens the outlet regulating window, so just plays the function of regulating flow and pressure, back slide cartridge 4 is when its female cone wall of front slide touches spool 3 and cuts off seal ring on the outer rims, the outlet passage window is fully closed, and greater than back slide cartridge 4 interior edge face areas, the pressure difference of fluid pressure action on both ends of the surface can make valve keep the trend of closing so as slide cartridge 5 interior edge face areas before making in the ring cavity when designing, the slide cartridge driving mechanism is that worm gear adds cam rotating cylinder mechanism, be by limited roller, slide cartridge thrust pin, the worm gear rotating cylinder, worm screw, the worm screw case, sealing case, handle is formed, and worm gear rotating cylinder 9 be a drum, and the one end has the protruding outer round platform position-limiting action that contacted with limited roller 6, be milled with two tangential cam paths near symmetry on the outer round platform cylindrical, the tangent line of the central axis of two tangential cam paths and rotating cylinder 9 cylinder cylindricals is angled, and worm gear is directly processed on the other end cylindrical of rotating cylinder 9, and rotating cylinder 9 is sleeved on the cylindrical of preceding slide cartridge 5, inlet flange 12 and outlet(discharge) flange 1 are the flange plate shape, their inboard mesopore places are the step circular hole, are used for making the inlet duct the other end of spool 3 to inject welding one in the circular hole of inlet flange 12 inboards, and the outer pipe the other end of spool 3 injects welding one in the circular hole of outlet(discharge) flange 1 inboard, valve body 2 is a cylindrical shape, valve body 2 middle part symmetries are milled with two axial 1 grooves, and valve body 2 is sleeved on outside inlet flange 12 and outlet(discharge) flange 1 outer rim, and welded seal, with preceding slide cartridge 5, back slide cartridge 4, spool 3, worm gear rotating cylinder 9 is sealed in the valve body 2, inlet flange is inboard to also have a ring-type convex, is used for radial support worm gear rotating cylinder 9, and limited roller 6 is by axle bed, position-limited shaft, roller and snap ring are formed, two limited roller 6 symmetries are installed in valve body cylindrical middle part, one end of the contacts side surfaces worm gear rotating cylinder 9 of roller is with 9 axial motions of restriction worm gear rotating cylinder, and the other end of worm gear rotating cylinder 9 is subjected to the axial restraint of inlet flange, and two slide cartridge thrust pins 7 are smooth cylindrical body, one end car has screw thread, valve body 2 cylindricals middle part symmetry is milled with the axial elongated slot of two two semicircles and is separated by uniformly with limited roller 6 positions, respectively two slide cartridge thrust pins, 7 threaded ends is passed two axial elongated slots on the valve body 2 during installation, passes two tangential cam paths of worm gear rotating cylinder 9 symmetries again, be screwed in two screws of preceding slide cartridge 5, use bolt again, sealing gasket and cover plate be two on the valve body 2 axial elongated slots sealings, and the edge high-temperature high-pressure glass is as eyeglass in one of them cover plate belt length groove, and two slide cartridge thrust pins 7 are subjected to the double constraints of axial elongated slot of two symmetries of tangential cam path and valve body 2 middle parts of 9 two symmetries of worm gear rotating cylinder simultaneously, because valve body 2 is fixed, when worm gear rotating cylinder 9 rotated outside preceding slide cartridge 5, slide cartridge was subjected to two slide cartridge thrust pins 7 to promote and can only be in axial sliding, and square hole welding worm screw case 11 is opened in valve body 2 nearly inlet ends, worm screw case 11 is the semicircle cylindrical shell, have counterbore to be used as worm screw 10 axle head seats in the left end cap, right end cap has circular hole, worm screw 10 meshes with worm gear 9 in circular hole is packed worm screw case 11 into, and sealing case 13 is by Stuffing box, filler, gland is formed, the Stuffing box body is as the circular hole sealing of worm screw case 11 right end caps and the support axle bed effect of worm screw 10, appear in the worm screw selfsealings box 13 and connect handle 14, the inlet flange 12 of valve is connected the Outer Tube system with outlet(discharge) flange 1, during work, handle with sleeve 14 drives worm screw 10 and rotates, worm gear rotating cylinder 9 with its engagement is rotated, and worm gear rotating cylinder 9 promotes two slide cartridge thrust pins 7 by its cam path and endwisely slips, and two slide cartridge thrust pins 7 can not be rotated by the constraint of valve body 2 axial elongated slots, two slide cartridge thrust pins 7 drive slide cartridge and are in axial sliding, thereby realize the function of valve switch.

Second kind of embodiment of the present invention is to adopt pipeline self liquid control system to realize as the slide cartridge driving mechanism, in conjunction with Fig. 3, Fig. 4 can see, connect 15 with the pressure lumen, preceding lumen connects 16, back lumen connects 17, eyeglass 18, pilot-actuated valve 19 substitutes limited roller 6, slide cartridge thrust pin 7, worm gear rotating cylinder 9, worm screw 10, worm screw case 11, sealing case 13, handle 14, at back slide cartridge 4, the cylindrical car of preceding slide cartridge 5 goes out two metallic seal ring grooves, respectively two metallic seal piston rings are put into groove, and form the metal hermetically-sealed construction of the piston ring between valve body 2 inwalls, preceding slide cartridge 5, inlet flange 12 forms airtight ante-chamber with valve body 2, back slide cartridge 4, outlet(discharge) flange 1 forms airtight back cavity with valve body 2, that is to say, the slide cartridge stuffing box gland is contained in the outside of spool 3 and the inside of valve body 2, the slide cartridge body can be free to slide in the outside of spool 3 and valve body 2 inwalls, when slide cartridge is in axial sliding, back slide cartridge 4 hides and opens the adjusting window, the function that so just plays switch and regulate flow pressure, when back slide cartridge 4 touches seal ring on the spool 3 forward, bands window is fully closed, the pressure lumen connects 15, preceding lumen connects 16, back lumen connects 17 and is little latus rectum pipe, the one end is that high-voltage tube connects, the other end is a light pipe, the entry end that a deep hole is communicated with inlet flange 12 is opened in the appropriate location on inlet flange 12, the pressure lumen connects 15 light pipes, one end and is inserted in deep hole mouth on the inlet flange 12, and welding is fixing, open a hole at valve body 2 near the ante-chamber position of inlet flange 12, preceding lumen connects 16 light pipes, one end and injects the aperture, and welding is fixing, open a hole at valve body 2 near the back cavity position of outlet(discharge) flange 1, back lumen connects 17 light pipes, one end and injects the aperture, and welding is fixing, the axial elongated slot of two semicircle is opened in valve body 2 intermediate portions, eyeglass 18 is by base, high pressure-temperature observation glass, the sealing lid is formed, eyeglass 18 bases are welded on the axial elongated slot of valve body 2, eyeglass is installed on the base, can see the change in location of slide cartridge by eyeglass.The fluid control mode is to realize like this, meeting 16 A that connect 3-position 4-way pilot-actuated valve 19 with reference to lumen before shown in Figure 4 holds, back lumen meets 17 B that connect control valve 19 and holds, the pressure lumen meets 15 C that connect control valve 19 and holds, the D termination of control valve 19 is led to other low-pressure pipeline, perhaps when fluid was harmless medium, the D of control valve 19 end also can directly lead to airborne release.The intact control valve 19 of leading moves and can carry out pressure change to ante-chamber and back cavity, slide cartridge is done endwisely slipped.During the valve proper functioning, 3-position 4-way pilot-actuated valve 19 often places the closed center position, at this moment it is consistent with loine pressure that valve ring cavity, ante-chamber and back cavity are pressed Fang Jun, and slide cartridge 4,5 is subjected to ante-chamber and the back cavity axial pressure is in the balance state of rest, when desire is transferred large outlet flow or pressure, make the logical C end of A termination of control valve 19 earlier, the logical D end of B termination, ante-chamber cut-in pressure lumen road at this moment, back cavity is connected low pressure line or logical atmosphere, because preceding cavity pressure is greater than back cavity pressure, valve open.When desiring to turn down rate of discharge or pressure, make the logical D end of A termination of control valve 19, the logical C end of B termination, at this moment ante-chamber is connected low pressure line or atmosphere, back cavity cut-in pressure lumen road, because preceding cavity pressure is less than the back cavity pressure, valve is turned down until closing.During contract fully, slide cartridge hides regulates window and contact seal ring, and this moment, the contact stress of sealing surface increased sharply, and valve closing is tight, does not leak, and slide cartridge keeps the trend of closing.

The 3rd embodiment of the present invention, be to adopt secondary seal chip architecture alternative metals packing flange structure, adopt planar cam mechanism to realize as the slide cartridge driving mode, as Fig. 5, shown in Figure 6, cam switch mechanism is by cam 21, camshaft 22 comes alternate figures 1, limited roller 6 among Fig. 2, slide cartridge thrust pin 7, worm gear rotating cylinder 9, worm screw 10, back slide cartridge 4 has annulus retaining than the path end, cam is disposed across between annulus retaining and the simple 4 larger caliber cylinder end sidewalls of back cunning in the groove, cam center has square hole, a circular hole of opening on the valve body 2, the sealing case of installing outside the hole, the camshaft two ends are the side of milling all, and an end sees through in the sealing case grafting camshaft square hole, the other end connects switch knob, handle with sleeve makes cam rotation, and the cam in the groove promotes slide cartridge and axially slides front and back, thereby realizes the function of valve switch.Use secondary seal chip architecture alternative metals packing flange structure, between preceding slide cartridge 5 and spool 3 inlet ducts, between the outer pipe of back slide cartridge 4 and spool 3, all adopting is slidingly matched does not use the sealing of metal piston ring, but the rearward end toroidal surface annular groove of getting on the bus out at back slide cartridge 4, secondary seal ring plate 20 is a cone barrel type for the annular flake inner radius, it is outer and pack into and be welded in the rearward end annular groove of back slide cartridge 4 that secondary seal sheet 20 is sleeved on spool 3 outer pipes, when valve closing, when back slide cartridge 4 touches seal ring on the spool 3 to its female cone wall of front slide, the bands window of ring cavity and outer pipe is closed, the circular cone tube position of secondary seal sheet 20 inner radius contacts with boss on spool 3 outer pipes, make slide cartridge exocoel and outlet passage between sealing, leak into the outer fluid of slide cartridge and be also sealed within outside the outer pipe.

The present invention can extensively substitute and have high parameter valves such as the high temperature that uses, high pressure, big-and-middle latus rectum now in power station, boiler, oil, chemical industry, water conservancy, nuclear power industry, has good switch and regulatory function.Valve proposed by the invention is simple and reliable, and part stress is reasonable, and the workman is easy to operate, and energy saving has application fields.

Fig. 1 is a plan view of the present invention.

Fig. 2 is the A-A left side sectional view of Fig. 1.

Fig. 3 is the plan view of the embodiment of the invention 2.

Fig. 4 is the fundamental diagram of the embodiment of the invention 2.

Fig. 5 is the plan view of the embodiment of the invention 3.

Fig. 6 is the plan view of the embodiment of the invention 3.

Embodiment 1: the present embodiment principle assumption diagram as shown in Figure 1 and Figure 2, be adjusting and the switch dual purpose valve that is operated under the high-temperature and high-pressure conditions, all part comprises that the piston ring material is stainless steel, valve body 2, spool 3, back slide cartridge 4, rotating cylinder 9 directly adopt rolling thick walled steel tube, preceding slide cartridge 5 adopts forging formings, two place's conical seal (contact) faces are all done the built-up welding of high hardness welding rod and are handled, and grind retrofit.

Embodiment 2: as shown in Figure 3, Figure 4, be to be fit to select for use under big latus rectum condition, maybe to concentrate the situation of carrying out several or tens valves of team control, pilot-actuated valve 19 will be selected for use according to the fluid temperature (F.T.) condition, high-temperature gas can be the stopcock structure of 5-20MM with latus rectum, normal temperature condition is optional more convenient with solenoid valve, and material selection is identical with embodiment 1 with mechanical processing technique.

Embodiment 3: as Fig. 5, shown in Figure 6, be the switch valve of work under the high-temperature and high-pressure conditions, adopted secondary seal chip architecture and face cam switching mechanism, material selection is identical with embodiment 1 with mechanical processing technique, the thickness of secondary seal sheet can be determined according to working pressure, be generally 0.3-2MM.

Claims (8)

1, a kind of sliding type force-aid valve, mainly comprise inlet flange, outlet(discharge) flange, spool, valve body, back slide cartridge, the metallic seal piston ring, it is characterized in that: it also comprises preceding slide cartridge [5], the slide cartridge driving mechanism, wherein spool [3] is by partition, inlet duct, outer pipe and seal ring are welded to form, partition by two streamline hemispherical Shells on the metallic packing ring in the middle of being welded in, the inlet duct outer pipe is cylindrical shape, the inlet duct outer pipe respectively is enclosed within a hemispherical Shell and also respectively is welded on seal ring one end outward, nearly partition place inlet duct has square window, nearly partition place outer pipe has the fluid flow regulation window, seal ring is a toroidal, slide cartridge [4] one sides after the sealing cone correspondence, preceding slide cartridge [5] is one section thin one section thick reducing drum, the reducing place is a taper barrel, the interior round car of preceding slide cartridge [5] thin diameter section cylinder has seal groove, it is poor that metallic seal piston ring [8] is put into sealing, outside the inlet duct of preceding slide cartridge [5] thin diameter section cover cartridge spool [3], back slide cartridge [4] is a drum, back slide cartridge [4] the wherein nearly inner radius of an end is conical sealing surface, outer one week of dome of back slide cartridge [4] is uniform for connecting the bolt hole of preceding slide cartridge [5] usefulness, the outer pipe cylindrical of spool [3] seal groove of having got on the bus, it is poor that metallic seal piston ring [8] is put into sealing, outside the outer pipe of back slide cartridge [4] cover cartridge spool [3], the cylinder of preceding slide cartridge [5] overlaps with the round platform rank than butt end and back slide cartridge [4], the locating stud location, connect sealing with bolt, slide cartridge is gone up and can freely be endwisely slipped at spool [3], preceding slide cartridge [5] does not hide the inlet window of spool [3] upper inlet pipe all the time, back slide cartridge [4] can hide or open the outlet regulating window, back slide cartridge [4] is when its female cone wall of front slide touches spool [3] and cuts off seal ring on the outer rim, the outlet passage window is fully closed, endwisely slipping of slide cartridge provided by the slide cartridge driving mechanism, inlet flange [12] and the inboard mesopore of outlet(discharge) flange [1] place are the step circular hole, be used for making the inlet duct of spool [3] and outer pipe to insert welding, valve body [2] is a cylindrical shape, be sleeved on outside inlet flange [12] and outlet(discharge) flange [1] outer rim, valve body [2] respectively with inlet flange [12] and outlet(discharge) flange [1] welded seal.

2, booster valve according to claim 1, it is characterized in that: between preceding slide cartridge [5] and spool [3] inlet duct, between the outer pipe of sliding letter in back [4] and spool [3], all can directly adopting is slidingly matched does not use the sealing of metal piston ring, but the rearward end toroidal surface annular groove of getting on the bus out at back slide cartridge [4], secondary seal sheet [20] is a taper barrel for ring thin slice inner radius, it is outer and pack into and be welded in the rearward end annular groove of back slide cartridge [4] that secondary seal sheet [20] is sleeved on spool [3] outer pipe, when valve closing, when back slide cartridge [4] touches seal ring on the spool [3] to its female cone wall of front slide, the inner radius circular cone tube position of the secondary seal sheet [20] in the rearward end annular groove of back slide cartridge [4] contact with the boss on spool [3] outer pipe make slide cartridge exocoel and outlet passage between seal.

3, booster valve according to claim 1, it is characterized in that: booster valve can be simplified to and include only spool [3], back slide cartridge [4], preceding slide cartridge [5], Sealing [8], slide cartridge driving mechanism, between wherein preceding slide cartridge [5] and spool [3] inlet duct, between the outer pipe of back slide cartridge [4] and spool [3], can take movable sealing structures such as metal piston ring, various material O type circle, filler, metal bellows or latex film; Seal ring on the spool [3] can be that metal hard-sealing also can be plastics O type circle or packing ring soft sealing structure, and spool [3] two ends can screw thread or Type of Welding connection Outer Tube system.

4, booster valve according to claim 1, it is characterized in that: have the fluid flow regulation window on the nearly partition place of spool [3] outer pipe, can have the window of square, hole formation window or other arbitrary shape as requested, to satisfy the requirement of various fluids and Flow-rate adjustment.

5, booster valve according to claim 1 is characterized in that: spool [3] can also be shaped in cast inblock, and spool [3] is gone up partition can substitute the partition that two streamline hemispherical Shells are formed with circular plate.

6, booster valve according to claim 1, it is characterized in that: the slide cartridge driving mechanism can be by limited roller [6], slide cartridge thrust pin [7], worm gear rotating cylinder [9], worm screw [10], worm screw case [11], sealing case [13], handle [14] is formed, worm gear rotating cylinder [9] is a drum, the one end has the outer round platform of the projection position-limiting action that contacted with limited roller [6], near symmetry on the outer round platform cylindrical is blunt two saturating grooves of tangential cam are arranged, worm gear is directly processed on the other end cylindrical of rotating cylinder [9], rotating cylinder [9] is sleeved on the cylindrical of preceding slide cartridge [5], limited roller [6] is by axle bed, position-limited shaft, roller and snap ring are formed, two limited rollers [6] symmetry is installed in valve body cylindrical middle part, two slide cartridge thrust pins [7] are smooth cylindrical body, one end car has screw thread, there are two screws at symmetry place, preceding slide cartridge [5] wide section cylinder cylindrical middle part, be used to install two slide cartridge thrust pins [7], valve body [2] cylindrical middle part symmetry is milled with two axial elongated slots and is separated by with limited roller [6] position, respectively the threaded end of two slide cartridge thrust pins [7] is passed two axial elongated slots on the valve body [2] during installation, pass two tangential cam paths of worm gear rotating cylinder [9] symmetry again, be screwed in two screws of preceding slide cartridge [5], use bolt again, sealing gasket and cover plate are with two on the valve body [2] axial elongated slot sealings, also can make and inlay high-temperature high-pressure glass in one of them cover plate belt length groove as eyeglass, the nearly inlet flange [12] of valve body [2] is opened square hole welding worm screw case [11], worm screw case [11] is the semicircle cylindrical shell, there is counterbore to be used as worm screw [10] axle head seat in the left end cap, right end cap has circular hole, worm screw [10] meshes with worm gear [9] in circular hole is packed worm screw case [11] into, sealing case [13] is by Stuffing box, filler, gland is formed, the Stuffing box body is as the support axle bed effect of sealing of the circular hole of worm screw case [11] right end cap and worm screw [10], appears in the worm screw selfsealings box [13] and connects handle [14].

7, booster valve according to claim 1, it is characterized in that: the slide cartridge driving mechanism can also be made up of face cam [21], camshaft [22], sealing case [13], handle [14], back slide cartridge [4] rearward end has annulus retaining, cam is disposed across annulus retaining with afterwards between slide cartridge [4] the larger caliber cylinder end sidewall in the groove, cam center has square hole and is used for inserting camshaft, a circular hole of opening on the valve body [2], the sealing case of installing outside the hole, the camshaft two ends are the side of milling all, one end sees through in the sealing case grafting camshaft square hole, and the other end connects switch knob.

8, booster valve according to claim 1, it is characterized in that: the slide cartridge driving mechanism can be connect [15] by the pressure lumen, preceding lumen connects [16], back lumen connects [17], eyeglass [18], pilot-actuated valve [19] is formed, earlier with back slide cartridge [4], the cylindrical car of preceding slide cartridge [5] goes out one or two seal groove, respectively two metallic seal piston rings are put into groove, and form the metal hermetically-sealed construction of the piston ring between valve body [2] inwall, preceding slide cartridge [5], inlet flange [12], spool [3] forms airtight ante-chamber with valve body [2], back slide cartridge [4], outlet(discharge) flange [1], spool [3] forms airtight back cavity with valve body [2], slide cartridge can be free to slide in the outside of spool [3] and valve body [2] inwall, the pressure lumen connects [15], preceding lumen connects [16], back lumen connects [17], and to be little latus rectum pipe one end be high-pressure pipe connector, the other end is a light pipe, the pressure lumen connects [15] light pipe one end and inserts the deep hole mouth that is welded on the inlet flange [12], connect valve inlet, preceding lumen connects [16] and inserts the ante-chamber position that is welded in valve body [2], back lumen connects [17] and inserts the back cavity position that is welded in valve body [2], valve body [2] intermediate portion is opened axial elongated slot and is used for installing eyeglass [18], eyeglass [18] is by base, high pressure-temperature observation glass, sealing gasket, gland is formed, the pressure lumen connects [15], preceding lumen connects [16], the end that back lumen connects [17] and have high-pressure pipe connector is connected respectively to the A of pilot-actuated valve [19], B, on the C end, the D of pilot-actuated valve [19] terminates on the outside low pressure pipeline or straight-through atmosphere, by pilot-actuated valve [19] ante-chamber and back cavity are carried out pressure change, slide cartridge is produced endwisely slip.

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