CN213575781U - Pilot-operated type pressure reducing valve - Google Patents

Abstract

The utility model provides a guide's formula relief pressure valve belongs to relief pressure valve technical field. The pilot-operated type pressure reducing valve comprises a valve body mechanism, a first valve cover mechanism and a second valve cover mechanism. The valve body mechanism comprises a valve casing, an adjusting assembly and a main valve assembly, the adjusting assembly comprises a pilot valve seat, a supporting block, a pilot valve core, a pilot spring and a supporting plate, and the main valve assembly comprises a main valve core, a main valve spring and a main valve seat. The utility model discloses a main air inlet, the valve casing, the second cavity, the main valve case to, the main valve disk seat, the guide air inlet, the guide case, the supporting shoe, the guide valve disk seat, branch, the push rod, the pressure regulating piece, the pressure regulating spring, adjust the air inlet, sealed piece, the effect of first sealing washer and second sealing washer, thereby reached the big and good purpose of leakproofness of application scope, through the gaseous cooperation of adjusting gas and guide, realize the simultaneous control, the pressure regulating scope has been increased, and a plurality of sealing members have been set up, the holistic leakproofness of valve body has been improved.

Description

Pilot-operated type pressure reducing valve

Technical Field

The utility model relates to a relief pressure valve field particularly, relates to a guide's formula relief pressure valve.

Background

The pilot-operated pressure reducing valve adopts the opening degree of an opening and closing part in a control valve body to adjust the flow of a medium, reduces the pressure of the medium, simultaneously adjusts the opening degree of the opening and closing part by means of the action of the pressure after the valve, keeps the pressure after the valve in a certain range, keeps the outlet pressure in a set range under the condition that the inlet pressure is continuously changed, and protects the subsequent life production appliances.

SUMMERY OF THE UTILITY MODEL

In order to make up for above not enough, the utility model provides a guide's formula relief pressure valve aims at improving the problem that guide's formula relief pressure valve pressure application scope is little and the leakproofness is poor.

The utility model discloses a realize like this:

the utility model provides a guide's formula relief pressure valve, including valve body mechanism, first valve gap mechanism and second valve gap mechanism.

The valve body mechanism comprises a valve shell, an adjusting component and a main valve component, the adjusting component comprises a pilot valve seat, a supporting block, a pilot valve core, a pilot spring and a supporting plate, the main valve component comprises a main valve core, a main valve spring and a main valve seat, a pilot air inlet and a main air inlet are formed in one side of the valve shell, a first cavity and a second cavity are formed in two ends of the valve shell respectively, the pilot air inlet is communicated with the first cavity and the second cavity, the main air inlet is communicated with the second cavity, the supporting plate is connected to the inner wall of the first cavity, the pilot valve core penetrates through the supporting plate in a sliding mode, the pilot spring is sleeved on the outer surface of the pilot valve core, the supporting block is installed at one end of the pilot valve core, the pilot valve seat is connected to the inner wall of the first cavity in a sliding, the main valve seat is connected with the inner wall of the second cavity in a sliding manner, the main valve spool penetrates through the main valve seat in a sliding manner, the main valve spring is sleeved on the outer surface of the main valve spool, the other side of the valve shell is provided with an adjusting air inlet, the adjusting air inlet is communicated with the second cavity and the first cavity, the first valve cover mechanism comprises a first valve cover shell, a control component, a pressure regulating component, a sealing component and a first sealing ring, the sealing component comprises a sealing block and a bolt, the first valve cover shell is in threaded connection with one end of the valve shell, the sealing block is in threaded connection with one end of the first valve cover shell through the bolt, the control component penetrates through the sealing block in a sliding manner, the control component is in threaded connection with the inner wall of the first valve cover shell, the pressure regulating component is arranged at one end of the control component, and the first sealing ring is arranged, the second valve cover mechanism includes a second valve cover shell and a second seal ring, the inside of the second valve cover shell is threaded onto the outer surface of the valve housing, and the second seal ring is disposed between the second valve cover shell and the valve housing.

In an embodiment of the pilot-operated pressure reducing valve of the present invention, the valve housing has an opposite side with a main gas outlet, and the main gas outlet is communicated with the second chamber.

In an embodiment of the present invention, the pilot operated pressure reducing valve includes a pilot operated valve seat having an inner surface formed with a first through hole, a support plate having an inner surface formed with a second through hole, a support block inserted into the first through hole, a pilot operated valve element in clearance fit with the second through hole, and a pilot operated spring having two ends respectively connected to the support block and the support plate.

In an embodiment of the present invention, the inner surface of the main valve seat has a third through hole, and the main valve element is inserted into the third through hole.

The utility model discloses a pilot-operated formula relief pressure valve embodiment, first recess and second recess have been seted up respectively to main valve disk seat both ends, first recess with the second recess with third through hole intercommunication, the main valve case can be plugged up first recess with the second recess.

In an embodiment of the pilot-operated pressure reducing valve of the present invention, the second valve cover mechanism has a slot formed in an inner wall thereof, and the main valve element is in clearance fit with the slot.

The utility model discloses an in the embodiment of a pilot-operated relief pressure valve, the control assembly includes hand wheel, threaded rod, round bar, external screw thread and fixture block, the second thread groove has been seted up to round bar one end, the threaded rod connect in hand wheel one side, threaded rod threaded connection in the second thread groove, the external screw thread set up in the round bar surface, the fixture block install in round bar one end, the external screw thread with first cavity inner wall threaded connection.

The utility model discloses an in the embodiment of a guide's formula relief pressure valve, the pressure regulating subassembly includes plectane, pressure regulating spring, pressure regulating block, branch and push rod, the draw-in groove has been seted up to plectane one side, the fixture block with the draw-in groove joint, the fixture block is the T type, pressure regulating spring both ends with the plectane with the pressure regulating block is connected, the branch both ends with the pressure regulating block with the push rod is connected.

In an embodiment of the pilot-operated pressure reducing valve of the present invention, the inner surface of the sealing block is provided with a threaded hole, and the bolt thread penetrates through the threaded hole.

In an embodiment of the present invention, the first thread groove is formed at one end of the valve housing, and the bolt is threadedly connected to the first thread groove.

The utility model has the advantages that: the pilot-operated pressure reducing valve obtained by the design in the utility model is connected with an external pipeline through the main air inlet when in use, so that external air enters the valve shell and the second cavity, and drives the main valve core to move downwards under the action of air pressure, the main valve core drives the main valve seat to move downwards, when the main valve seat is separated from the second cavity, the second cavity is communicated with the main air outlet, so that the air in the second cavity is introduced into another pipeline from the main air outlet, and simultaneously introduced into a pilot gas through the pilot air inlet, the pilot gas pushes the pilot valve core to move upwards, the pilot valve core pushes the supporting block to move upwards, the supporting block drives the pilot valve seat to slide upwards, the pilot valve seat drives the pressure regulating block to move upwards through the supporting rod and the push rod, the pressure regulating block pushes the pressure regulating spring to move upwards, the threaded rod is driven to rotate through the manual rotation hand, the round rod drives the clamping block to move up and down through the external thread, the clamping block extrudes the pressure regulating spring through the circular plate, the pressure regulating spring extrudes the pressure regulating block, the pressure regulating pressure is adjusted, meanwhile, regulating gas is introduced through the regulating gas inlet, the regulating gas can drive the main valve spool to move downwards initially, the regulating gas inlet can be communicated with the pilot gas inlet along with the downward movement of the main valve spool, the simultaneous adjustment can be realized by utilizing the matching of the regulating gas and the pilot gas, the pressure regulating range can be enlarged, meanwhile, the sealing block can improve the sealing property between the round rod and the first valve cover shell, the first sealing ring increases the sealing property between the first valve cover shell and the valve shell, the second sealing ring increases the sealing property between the second valve cover shell and the valve shell, the overall sealing property of the pressure reducing valve is good, the service life of the pressure reducing valve is prolonged, the purposes of large application range and good, realize adjusting simultaneously, increased the pressure regulating scope, and set up a plurality of sealing members, improved the holistic leakproofness of valve body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a pilot-operated pressure reducing valve according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a valve body mechanism provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an adjusting assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a main valve assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a first valve cover mechanism provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a control assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a pressure regulating assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a sealing assembly according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second valve cover mechanism according to an embodiment of the present invention.

In the figure: 10-a valve body mechanism; 110-a valve housing; 120-a regulating component; 121-pilot valve seat; 122-a support block; 123-pilot valve core; 124-a pilot spring; 125-a support plate; 126-a first via; 127-a second via; 130-a main valve assembly; 131-a main valve spool; 132-a main valve spring; 133-main valve seat; 134-third via; 135-a first groove; 136-a second groove; 140-a first chamber; 150-a second chamber; 160-pilot inlet; 170-primary air intake; 180-adjusting the air inlet; 190-a main air outlet; 20-a first valve cover mechanism; 210-a first valve cover housing; 220-a control component; 221-hand wheel; 222-a threaded rod; 223-round bar; 224-external threads; 225-fixture block; 226-second thread groove; 230-a voltage regulation component; 231-circular plate; 232-pressure regulating spring; 233-pressure regulating block; 234-strut; 235-a push rod; 236-card slot; 240-a seal assembly; 241-a sealing block; 242-bolt; 243-threaded hole; 250-a first thread groove; 260-a first sealing ring; 30-a second valve cover mechanism; 310-a second bonnet shell; 320-a second seal ring; 330-slot.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

Referring to fig. 1, the present invention provides a pilot-operated pressure reducing valve, which includes a valve body mechanism 10, a first valve cover mechanism 20, and a second valve cover mechanism 30.

The first valve cover mechanism 20 and the second valve cover mechanism 30 are respectively connected to two ends of the valve body mechanism 10 through threads, the valve body mechanism 10 is used for introducing regulating gas and pilot gas, and the pressure regulating range is enlarged, the first valve cover mechanism 20 is used for sealing the upper end and the regulating pressure of the valve body mechanism 10, and the second valve cover mechanism 30 is used for sealing the lower end of the valve body mechanism 10.

Referring to fig. 1, 2, 3 and 4, the valve body mechanism 10 includes a valve housing 110, an adjusting assembly 120 and a main valve assembly 130, the adjusting assembly 120 includes a pilot valve seat 121, a support block 122, a pilot valve core 123, a pilot spring 124 and a support plate 125, the main valve assembly 130 includes a main valve core 131, a main valve spring 132 and a main valve seat 133, a pilot air inlet 160 and a main air inlet 170 are opened at one side of the valve housing 110, a first chamber 140 and a second chamber 150 are respectively opened at two ends of the valve housing 110, the pilot air inlet 160 is communicated with the first chamber 140 and the second chamber 150, the main air inlet 170 is communicated with the second chamber 150, the support plate 125 is connected to an inner wall of the first chamber 140, specifically, the support plate 125 is fixedly connected to an inner wall of the first chamber 140 by welding, the pilot valve core 123 slidably penetrates through the support plate 125, the pilot spring 124 is sleeved on an outer surface, specifically, the support block 122 is fixedly installed at one end of the pilot valve spool 123 by welding, the pilot valve seat 121 is slidably connected to an inner wall of the first chamber 140, the support block 122 is inserted into the pilot valve seat 121, the main valve seat 133 is slidably connected to an inner wall of the second chamber 150, the main valve spool 131 slidably penetrates through the main valve seat 133, the main valve spring 132 is sleeved on an outer surface of the main valve spool 131, the other side of the valve housing 110 is provided with an adjusting air inlet 180, the adjusting air inlet 180 is communicated with the second chamber 150 and the first chamber 140, the pilot air inlet 160 is used for passing through pilot gas, the main air inlet 170 is used for being connected with an external pipeline, so that external gas enters the valve housing 110 and the second chamber 150, the external gas drives the main valve spool 131 to move downwards, the main valve spool 131 drives the main valve seat 133 to move downwards, when the main valve seat, the gas in the second chamber 150 is led into another pipeline from the main gas outlet 190, the pilot gas is led into the pilot gas inlet 160, the pilot gas pushes the pilot valve core 123 to move upwards, the pilot valve core 123 pushes the supporting block 122 to move upwards, the supporting block 122 drives the pilot valve seat 121 to slide upwards, the adjusting gas inlet 180 is led into adjusting gas, the adjusting gas initially drives the main valve core 131 to move downwards, the adjusting gas inlet 180 is communicated with the pilot gas inlet 160 along with the downward movement of the main valve core 131, simultaneous adjustment is realized through the matching of the adjusting gas and the pilot gas, and the pressure adjusting range can be enlarged.

In some specific embodiments, the other side of the valve housing 110 is provided with a main air outlet 190, the main air outlet 190 is communicated with the second chamber 150, the inner surface of the pilot valve seat 121 is provided with a first through hole 126, the inner surface of the support plate 125 is provided with a second through hole 127, the support block 122 is inserted in the first through hole 126, the pilot valve core 123 is in clearance fit with the second through hole 127, two ends of the pilot spring 124 are respectively connected with the support block 122 and the support plate 125, specifically, two ends of the pilot spring 124 are respectively fixedly connected with the support block 122 and the support plate 125 by welding, the inner surface of the main valve seat 133 is provided with a third through hole 134, the main valve core 131 is inserted in the third through hole 134, two ends of the main valve seat 133 are respectively provided with a first groove 135 and a second groove 136, the first groove 135 and the second groove 136 are communicated with.

Referring to fig. 1, 2, 5, and 8, the first bonnet mechanism 20 includes a first bonnet housing 210, a control assembly 220, a pressure regulating assembly 230, a sealing assembly 240, and a first sealing ring 260, where the sealing assembly 240 includes a sealing block 241 and a bolt 242, the first bonnet housing 210 is screwed to one end of the valve housing 110, the sealing block 241 is screwed to one end of the first bonnet housing 210 through the bolt 242, specifically, the sealing block 241 is a rubber block, the control assembly 220 slidably penetrates through the sealing block 241, the control assembly 220 is screwed to an inner wall of the first bonnet housing 210, the pressure regulating assembly 230 is disposed at one end of the control assembly 220, the first sealing ring 260 is disposed between the first bonnet housing 210 and the valve housing 110, specifically, the first sealing ring 260 is a rubber ring, the bolt 242 is used to fixedly mount the sealing block 241 on the valve housing 110, and the sealing block 241 is used to seal the connection of the first bonnet housing 210 and the valve housing 110.

Referring to fig. 1, 2, and 9, the second valve cover mechanism 30 includes a second valve cover shell 310 and a second sealing ring 320, the inner side of the second valve cover shell 310 is screwed to the outer surface of the valve housing 110, the second sealing ring 320 is disposed between the second valve cover shell 310 and the valve housing 110, specifically, the second sealing ring 320 is a rubber ring, the inner wall of the second valve cover mechanism 30 is provided with a slot 330, the main valve core 131 is in clearance fit with the slot 330, and the second sealing ring 320 is used for sealing the connection between the second valve cover shell 310 and the valve housing 110.

Referring to fig. 5, 6 and 7, the control assembly 220 includes a hand wheel 221, a threaded rod 222, a round rod 223, an external thread 224 and a fixture block 225, one end of the round rod 223 is provided with a second thread groove 226, the threaded rod 222 is connected to one side of the hand wheel 221, specifically, the threaded rod 222 is fixedly connected to one side of the hand wheel 221 by welding, the threaded rod 222 is connected to the second thread groove 226 by threading, the external thread 224 is arranged on the outer surface of the round rod 223, the fixture block 225 is mounted at one end of the round rod 223, specifically, the fixture block 225 is fixedly mounted at one end of the round rod 223 by welding, the external thread 224 is connected to the inner wall of the first chamber 140 by threading, the pressure regulating assembly 230 includes a round plate 231, a pressure regulating spring 232, a pressure regulating block 233, a support rod 234 and a push rod 235, one side of the round plate 231 is provided with a fixture groove 236, the fixture block 225 is clamped, the fixture block 225 is T, two ends of the supporting rod 234 are connected with the pressure regulating block 233 and the push rod 235, specifically, two ends of the supporting rod 234 are fixedly connected with the pressure regulating block 233 and the push rod 235 through welding, the threaded rod 222 is used for fixing the hand wheel 221 on the round rod 223, the hand wheel 221 is used for driving the round rod 223 to rotate, the round rod 223 drives the fixture block 225 to move up and down through the external thread 224, the fixture block 225 drives the circular plate 231 to move up and down through the clamping groove 236, the circular plate 231 extrudes the pressure regulating block 233 through the pressure regulating spring 232, and the pressure regulating block 233 drives the.

In some embodiments, the sealing block 241 has a threaded hole 243 formed in an inner surface thereof, the bolt 242 is threaded through the threaded hole 243, a first threaded groove 250 is formed at one end of the valve housing 110, and the bolt 242 is threaded into the first threaded groove 250.

The operating principle of the pilot type pressure reducing valve is as follows: when the pneumatic valve is used, the pneumatic valve is connected with an external pipeline through the main air inlet 170, so that external air enters the valve housing 110 and the second chamber 150, the main valve spool 131 is driven to move downwards under the action of air pressure, the main valve spool 131 drives the main valve seat 133 to move downwards, when the main valve seat 133 is separated from the second chamber 150, the second chamber 150 is communicated with the main air outlet 190, so that air in the second chamber 150 is introduced into the other pipeline from the main air outlet 190, meanwhile, pilot air is introduced through the pilot air inlet 160, the pilot air pushes the pilot valve spool 123 to move upwards, the pilot valve spool 123 pushes the supporting block 122 to move upwards, the supporting block 122 drives the pilot valve seat 121 to slide upwards, the pilot valve seat 121 drives the pressure regulating block 233 to move upwards through the supporting rod 234 and the push rod 235, the pressure regulating block 233 pushes the pressure regulating spring 232 to move upwards, the threaded rod 222 is driven to rotate by manually rotating the hand, the round rod 223 drives the fixture block 225 to move up and down through the external thread 224, the fixture block 225 extrudes the pressure regulating spring 232 through the circular plate 231, the pressure regulating spring 232 extrudes the pressure regulating block 233, the pressure is regulated, meanwhile, the regulating gas is introduced through the regulating gas inlet 180, the regulating gas can drive the main valve spool 131 to move downwards initially, along with the downward movement of the main valve spool 131, the regulating gas inlet 180 is communicated with the pilot gas inlet 160, the simultaneous regulation is realized by the cooperation of the regulating gas and the pilot gas, the pressure regulating range can be enlarged, meanwhile, the sealing block 241 can improve the sealing performance between the round rod 223 and the first valve cover shell 210, the first sealing ring 260 increases the sealing performance between the first valve cover shell 210 and the valve shell 110, the second sealing ring 320 increases the sealing performance between the second valve cover shell 310 and the valve shell 110, the whole sealing performance of the pressure reducing valve is good, the service life of the pressure reducing valve is prolonged, and the purposes of, through the cooperation of adjusting gas and guide gas, realize adjusting simultaneously, increased the pressure regulating scope, and set up a plurality of sealing members, improved the holistic leakproofness of valve body.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pilot operated pressure reducing valve, comprising

The valve body mechanism (10), the valve body mechanism (10) comprises a valve casing (110), an adjusting assembly (120) and a main valve assembly (130), the adjusting assembly (120) comprises a pilot valve seat (121), a supporting block (122), a pilot valve core (123), a pilot spring (124) and a supporting plate (125), the main valve assembly (130) comprises a main valve core (131), a main valve spring (132) and a main valve seat (133), a pilot air inlet (160) and a main air inlet (170) are formed in one side of the valve casing (110), a first chamber (140) and a second chamber (150) are respectively formed in two ends of the valve casing (110), the pilot air inlet (160) is communicated with the first chamber (140) and the second chamber (150), the main air inlet (170) is communicated with the second chamber (150), and the supporting plate (125) is connected to the inner wall of the first chamber (140), the pilot valve core (123) penetrates through the supporting plate (125) in a sliding manner, the pilot spring (124) is sleeved on the outer surface of the pilot valve core (123), the supporting block (122) is installed at one end of the pilot valve core (123), the pilot valve seat (121) is connected to the inner wall of the first chamber (140) in a sliding manner, the supporting block (122) is inserted into the pilot valve seat (121), the main valve seat (133) is connected to the inner wall of the second chamber (150) in a sliding manner, the main valve core (131) penetrates through the main valve seat (133) in a sliding manner, the main valve spring (132) is sleeved on the outer surface of the main valve core (131), an adjusting air inlet (180) is formed in the other side of the valve casing (110), and the adjusting air inlet (180) is communicated with the second chamber (150) and the first chamber (140);

a first bonnet mechanism (20), the first bonnet mechanism (20) comprising a first bonnet housing (210), a control assembly (220), a pressure regulating assembly (230), a sealing assembly (240), and a first seal ring (260), the seal assembly (240) comprises a seal block (241) and a bolt (242), the first valve cover housing (210) is screw-coupled to one end of the valve housing (110), the sealing block (241) is screw-coupled to one end of the first valve cover case (210) by the bolt (242), the control component (220) penetrates through the sealing block (241) in a sliding mode, the control component (220) is in threaded connection with the inner wall of the first valve cover shell (210), the pressure regulating assembly (230) is arranged at one end of the control assembly (220), and the first sealing ring (260) is arranged between the first valve cover shell (210) and the valve shell (110);

a second valve cover mechanism (30), the second valve cover mechanism (30) comprising a second valve cover shell (310) and a second sealing ring (320), the inner side of the second valve cover shell (310) is screwed to the outer surface of the valve housing (110), and the second sealing ring (320) is arranged between the second valve cover shell (310) and the valve housing (110).

2. A pilot operated pressure reducing valve according to claim 1 wherein the valve housing (110) has a main outlet (190) formed in the other side thereof, the main outlet (190) communicating with the second chamber (150).

3. The pilot-operated pressure reducing valve according to claim 1, wherein a first through hole (126) is formed in the inner surface of the pilot valve seat (121), a second through hole (127) is formed in the inner surface of the support plate (125), the support block (122) is inserted into the first through hole (126), the pilot valve core (123) is in clearance fit with the second through hole (127), and two ends of the pilot spring (124) are respectively connected with the support block (122) and the support plate (125).

4. The pilot-operated pressure reducing valve according to claim 1, wherein a third through hole (134) is formed in an inner surface of the main valve seat (133), and the main valve spool (131) is inserted into the third through hole (134).

5. The pilot-operated pressure reducing valve according to claim 4, wherein a first groove (135) and a second groove (136) are respectively formed at two ends of the main valve seat (133), the first groove (135) and the second groove (136) are communicated with the third through hole (134), and the main valve spool (131) can block the first groove (135) and the second groove (136).

6. The pilot operated pressure reducing valve according to claim 1, wherein the second valve cover mechanism (30) has a slot (330) formed in an inner wall thereof, and the main valve spool (131) is in clearance fit with the slot (330).

7. The pilot-operated pressure reducing valve according to claim 1, wherein the control assembly (220) comprises a hand wheel (221), a threaded rod (222), a round rod (223), an external thread (224) and a clamping block (225), a second threaded groove (226) is formed in one end of the round rod (223), the threaded rod (222) is connected to one side of the hand wheel (221), the threaded rod (222) is in threaded connection with the second threaded groove (226), the external thread (224) is arranged on the outer surface of the round rod (223), the clamping block (225) is arranged at one end of the round rod (223), and the external thread (224) is in threaded connection with the inner wall of the first chamber (140).

8. The pilot-operated pressure reducing valve according to claim 7, wherein the pressure regulating assembly (230) comprises a circular plate (231), a pressure regulating spring (232), a pressure regulating block (233), a support rod (234) and a push rod (235), a clamping groove (236) is formed in one side of the circular plate (231), the clamping block (225) is clamped with the clamping groove (236), the clamping block (225) is T-shaped, two ends of the pressure regulating spring (232) are connected with the circular plate (231) and the pressure regulating block (233), and two ends of the support rod (234) are connected with the pressure regulating block (233) and the push rod (235).

9. The pilot operated pressure reducing valve according to claim 1, wherein the sealing block (241) has a threaded hole (243) formed in an inner surface thereof, and the bolt (242) is threaded through the threaded hole (243).

10. A pilot operated pressure reducing valve according to claim 1, wherein the valve housing (110) has a first screw groove (250) formed at one end thereof, and the bolt (242) is screw-coupled to the first screw groove (250).

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