CN220118731U - Pilot relief valve for factory conveying system - Google Patents

Abstract

The utility model relates to the technical field of pressure reducing valves, in particular to a pilot pressure reducing valve for an inter-plant conveying system. The utility model provides a pilot pressure reducing valve for an inter-plant conveying system, which comprises the following components: the main valve body, the main valve core, the pilot valve seat, the pilot valve core, the linkage piston, the adjusting piece and the filtering piece, wherein the pilot valve seat is fixed on the main valve body and is communicated with the linkage piston and the main valve body through a pilot runner; the main valve core is arranged in the main valve body in a lifting manner, is linked with the linkage piston and is suitable for opening or closing the main valve body; the adjusting piece is fixed on the pilot valve seat and is linked with the pilot valve core; the valve core is arranged in the valve seat in a lifting manner and is suitable for opening or closing the linkage piston; the filter is fixed in the guide valve seat lateral wall, and the filter is suitable for filtering and intercepting the medium that flows into the linkage piston. Through the setting of filter, can filter the medium before the medium flows to the piston cylinder body, avoid the linkage piston to be blocked by the condition of card, improve work efficiency.

Description

Pilot relief valve for factory conveying system

Technical Field

The utility model relates to the technical field of pressure reducing valves, in particular to a pilot pressure reducing valve for an inter-plant conveying system.

Background

The constant high pressure automatic conveying system for the factory pipeline is used for pressurizing and conveying through a storage unit pipeline conveying pump, and ensuring that the conveying pressure of materials in the pipeline is more than 2 times of the required pressure of a production factory through variable frequency control and an overpressure reflux device designed at the pump outlet.

Before entering the production device, a pressure reducing valve is required to be arranged, so that the materials in the pipeline can be ensured to be conveyed to the production device according to the required stable pressure. In order to keep the pressure in the pipeline stable, the pressure at the outlet of the pipeline is regulated by adopting a pilot piston type pressure reducing valve, the pilot piston type pressure reducing valve has higher requirements on the cleanliness of media entering the valve body, and a main valve piston is often blocked. Therefore, it is necessary to develop a pilot pressure reducing valve for an inter-plant delivery system.

Disclosure of Invention

The utility model aims to provide a pilot pressure reducing valve for an inter-plant conveying system so as to solve the problems.

In order to achieve the above object, an embodiment of the present utility model provides a pilot pressure reducing valve for an inter-plant conveying system, including:

the valve comprises a main valve body, a main valve core, a guide valve seat, a guide valve core, a linkage piston, an adjusting piece and a filtering piece, wherein the guide valve seat is fixed on the main valve body and is communicated with the linkage piston and the main valve body through a guide runner;

the main valve core is arranged in the main valve body in a lifting manner, is linked with the linkage piston and is suitable for opening or closing the main valve body;

the adjusting piece is fixed on the pilot valve seat and is linked with the pilot valve core;

the valve guide core is arranged in the valve guide seat in a lifting manner, and is suitable for opening or closing the linkage piston;

the filter element is fixed on the side wall of the pilot valve seat, and the filter element is suitable for filtering and intercepting the medium flowing into the linkage piston.

Preferably, a first accommodating bin and a second accommodating bin are arranged on the pilot valve seat, and the second accommodating bin is arranged above the first accommodating bin;

the pilot valve core is arranged in the first accommodating bin in a lifting manner, and is suitable for adjusting the communication or closing of the first accommodating bin and the second accommodating bin;

the pilot valve core is linked with the adjusting piece; wherein,

rotating the adjustment member is adapted to adjust the pilot valve core to move upward or downward to cause the first and second receiving compartments to communicate or close.

Preferably, a transverse column is fixed on the side wall of the pilot valve seat, and the interior of the transverse column is hollow;

the main valve body is provided with a first flow passage close to the liquid inlet end, and the first flow passage is communicated with the transverse column;

the transverse column is in communication with the containment bin.

Preferably, the filter member includes: the sealing stud is matched with the transverse column, and is suitable for sealing the transverse column;

the filter screen is detachably arranged in the transverse column, and one end of the filter screen is abutted with the side wall of the transverse column; the filter screen is suitable for filtering and intercepting impurities in the medium flowing to the accommodating bin.

Preferably, the filter screen is hollow and open and cylindrical, and the opening of the filter screen faces the sealing stud;

a plurality of filter holes are formed in the outer wall and the bottom wall of the filter screen, and the filter holes are suitable for filtering fixed impurities in the interception medium.

Preferably, a piston cylinder sleeve is fixed in the main valve body, the piston cylinder sleeve is matched with the linkage piston,

the piston cylinder sleeve is communicated with the second accommodating bin, wherein,

when the valve guide core moves downwards, the medium in the first accommodating bin is suitable for flowing into the piston cylinder sleeve and pushing the linkage piston to move downwards, so that the main valve core moves downwards synchronously to open the main valve body.

Preferably, a third accommodating bin is arranged on the pilot valve seat, a membrane is fixed in the third accommodating bin, the lower end of the adjusting piece abuts against the upper end of the membrane, and the upper end of the pilot valve core abuts against the lower end of the membrane; wherein,

when the diaphragm moves upwards, the adjusting piece is pushed to move upwards synchronously, and the pilot valve core is suitable for sealing the first accommodating bin and the second accommodating bin.

Preferably, the main valve body is provided with a second flow passage near the liquid outlet end, the second flow passage is communicated with the third accommodating bin, wherein,

when the pressure of the liquid outlet end of the main valve body is larger than that of the liquid inlet end, the medium flows into the third accommodating bin through the second flow channel, and the membrane can be pushed to move downwards.

Compared with the prior art, the embodiment of the pilot reducing valve for the factory conveying system has the following beneficial effects: through the setting of filter, when the medium flow in the main valve body is to the piston cylinder liner in the disk seat, the filter can filter the impurity in the interception medium, prevents that the linkage piston from being blocked's condition emergence, has improved the life of equipment.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a pilot pressure relief valve for an inter-plant delivery system of the present utility model;

FIG. 2 shows a perspective view of the interior of the pilot valve seat of the present utility model;

FIG. 3 shows a longitudinal cross-sectional view of the main valve body and pilot valve seat of the present utility model;

FIG. 4 shows an internal cross-sectional view of the main valve body of the present utility model;

fig. 5 shows a perspective view of the filter screen of the present utility model.

In the figure:

1. a main valve body; 10. a first flow passage; 11. a second flow passage; 12. a piston cylinder sleeve; 13. a main valve seat; 14. a main valve spring;

2. a main spool;

3. a valve guide seat; 30. a first accommodation chamber; 31. a second accommodation bin; 32. a third accommodating bin; 33. a transverse column; 34. a membrane; 35. a pilot valve spring; 36. a linkage flow passage;

4. a valve guide core; 5. a linkage piston; 6. an adjusting member; 7. a filter; 71. sealing the stud; 72. and (3) a filter screen.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 4, the present utility model provides a pilot pressure reducing valve for an inter-plant conveying system, comprising: the pilot valve comprises a main valve body 1, a main valve core 2, a pilot valve seat 3, a pilot valve core 4, a linkage piston 5, an adjusting piece 6 and a filtering piece 7, wherein the pilot valve seat 3 is fixed on the main valve body 1, and the pilot valve seat 3 is communicated with the linkage piston 5 and the main valve body 1 through a pilot runner; the inside of the main valve body 1 is Z-shaped, a main valve seat 13 is fixed in the main valve body 1, the main valve seat 13 is matched with the main valve core 2, and the main valve core 2 is suitable for opening or closing the main valve seat 13 when moving downwards or upwards. The main valve core 2 is arranged in the main valve body 1 in a lifting manner, the main valve core 2 is in linkage with the linkage piston 5, and the main valve core 2 is suitable for opening or closing the main valve body 1; a main valve spring 14 is vertically fixed in the main valve body 1, the upper end of the main valve spring 14 is fixed at the lower end of the main valve core 2, and the main valve spring 14 is suitable for pushing the main valve core 2 to move towards the main valve seat 13 so that the main valve core 2 can close the main valve seat 13. The adjusting piece 6 is fixed on the pilot valve seat 3, and the adjusting piece 6 is linked with the pilot valve core 4; when the movable end of the adjusting piece 6 moves downwards, the pilot valve core 4 is pushed to move downwards synchronously, so that the first accommodating bin 30 and the second accommodating bin 31 are in a communicating state, and the pressure of the medium flowing out of the liquid outlet end of the main valve body 1 can be adjusted. The pilot valve core 4 is arranged in the pilot valve seat 3 in a lifting manner, and is suitable for opening or closing the linkage piston 5; after the medium enters the first accommodating chamber 30 through the first flow passage 10, at this time, the adjusting piece 6 pushes the pilot valve core 4 to move downwards, the first accommodating chamber 30 is communicated with the second accommodating chamber 31, after the medium is filtered by the filtering piece 7, the medium enters the piston cylinder sleeve 12 through the first accommodating chamber 30 and the second accommodating chamber 31, the medium can push the linkage piston 5 to move downwards, the linkage piston 5 synchronously drives the main valve core 2 to move downwards, at this time, the main valve core 2 can overcome the elastic force of the main valve spring 14, so that the main valve seat 13 is opened, and the medium passes through the main valve seat 13 and flows to the liquid outlet end of the main valve body 1; and the liquid flows upwards along with the second flow passage 11, the medium enters the third accommodating chamber 32, and when the medium in the third accommodating chamber 32 keeps constant pressure, the opening and closing angle between the main valve core 2 and the main valve seat 13 can be kept constant, so that the effect of reducing the pressure of the liquid outlet end of the main valve body 1 is realized. The filter element 7 is fixed to the side wall of the pilot valve seat 3, the filter element 7 being adapted to filter the medium which intercepts the flow into the ganged piston 5. The setting of filter 7 can filter the impurity in the medium that gets into in the first storehouse 30 that holds, has avoided impurity to influence the sliding seal effect between piston cylinder liner 12 and the linkage piston 5, has avoided the linkage piston 5 to be taken place by the condition of card, has improved the life of equipment.

In order to realize pilot linkage, a first accommodating bin 30 and a second accommodating bin 31 are arranged on the pilot valve seat 3, and the second accommodating bin 31 is arranged above the first accommodating bin 30; the pilot valve core 4 is arranged in the first accommodating bin 30 in a lifting manner, a pilot valve spring 35 is fixed in the first accommodating bin 30, the upper end of the pilot valve spring 35 is fixed at the lower end of the pilot valve core 4, and the pilot valve spring 35 is suitable for pushing the pilot valve core 4 to move upwards so that the pilot valve core 4 can close the first accommodating bin 30 and the second accommodating bin 31; the pilot valve core 4 is suitable for adjusting the communication or closure of the first containing bin 30 and the second containing bin 31; the pilot valve core 4 is linked with the adjusting piece 6; when the movable end of the adjusting piece 6 moves downwards, the adjusting piece is suitable for pushing the pilot valve core 4 to overcome the elastic force of the pilot valve spring 35 and move downwards so as to enable the first accommodating bin 30 and the second accommodating bin 31 to be in a communicating state; a plurality of linkage flow passages 36 are axially formed in the inner bottom wall of the second accommodating bin 31, and the linkage flow passages 36 are communicated with the piston cylinder sleeve 12; when the first accommodation chamber 30 and the second accommodation chamber 31 are communicated, the medium is suitable for entering the piston cylinder sleeve 12 along the linkage flow channel 36, and the medium can push the linkage piston 5 to move downwards. Wherein the movable end of the adjustment member 6 is turned, the movable end of the adjustment member 6 is adapted to adjust the pilot valve core 4 to move upwards or downwards to bring the first receiving chamber 30 and the second receiving chamber 31 into communication or closure.

In order to achieve the effect of the filter medium, a transverse column 33 is fixed on the side wall of the pilot valve seat 3, and the interior of the transverse column 33 is hollow; a first flow passage 10 is formed in the main valve body 1 near the liquid inlet end, and the first flow passage 10 is communicated with the transverse column 33; the first flow passage 10 is arranged at the left side of the main valve core 2, and the second flow passage 11 is arranged at the right side of the main valve core 2; the transverse column 33 communicates with the first containing compartment 30. The high-pressure medium on the left side of the main valve body 1 is adapted to flow into the transverse column 33 and the first receiving compartment 30 via the first flow channel 10.

Preferably, the filter element 7 comprises: a sealing stud 71 and a filter screen 72, wherein the sealing stud 71 is matched with the transverse column 33, and the sealing stud 71 is suitable for sealing the transverse column 33; the sealing stud 71 is in threaded fit with the transverse column 33, the filter screen 72 is detachably arranged in the transverse column 33, and one end of the filter screen 72 is abutted against the side wall of the transverse column 33; the filter screen 72 is adapted to filter out impurities from the medium flowing to the holding compartment. When the filter screen 72 is installed, the filter screen 72 is horizontally inserted into the transverse column 33, the opening of the filter screen 72 faces the sealing stud 71, the sealing stud 71 is rotated circumferentially to seal the transverse column 33, meanwhile, the sealing stud 71 is suitable for pressing the filter screen 72, so that the end part of the filter screen 72 away from the sealing stud 71 can prop against the side wall of the transverse column 33, and the medium entering the transverse column 33 through the first runner 10 is filtered and intercepted by the filter screen 72 and then is suitable for flowing into the first accommodating bin 30. The filter screen 72 and the sealing stud 71 are arranged to be detachable, so that the filter screen 72 can be conveniently replaced or overhauled, and the service life of the equipment is prolonged; meanwhile, the piston cylinder sleeve 12 is cleaned in a mode of disassembling the guide valve seat 3 is avoided, and the working efficiency is improved.

Optionally, the filter screen 72 is hollow and open, and the opening of the filter screen 72 faces the sealing stud 71; the outer wall and the bottom wall of the filter screen 72 are provided with a plurality of filter holes, and the filter holes are suitable for filtering fixed impurities in the interception medium. The filter screen 72 can effectively intercept impurities in the medium, and the service life of the device is prolonged. The aperture of the filter hole formed in the outer wall of the filter screen 72 is larger than the aperture of the filter hole formed in the bottom wall of the filter screen 72, after the medium enters the transverse column 33 through the first flow channel 10, the medium enters the filter screen 72 after being filtered by the filter hole formed in the outer wall of the filter screen 72, and flows into the first accommodating bin 30 after being filtered by the filter hole formed in the bottom wall of the filter screen 72, and the apertures of the filter holes are provided with different inner diameters, so that the effect of the filter screen 72 for filtering and intercepting impurities in the medium can be further improved.

In order to realize the up-and-down sliding of the linkage piston 5, a piston cylinder sleeve 12 is fixed in the main valve body 1, the piston cylinder sleeve 12 is matched with the linkage piston 5, the linkage piston 5 is suitable for vertically sliding up and down in the piston cylinder sleeve 12, and the piston cylinder sleeve 12 is communicated with the linkage flow channel 36; the piston cylinder sleeve 12 is communicated with the second accommodating chamber 31, wherein when the pilot valve core 4 moves downwards, the medium in the first accommodating chamber 30 is suitable for flowing into the piston cylinder sleeve 12, and the medium in the piston cylinder sleeve 12 is suitable for pushing the linkage piston 5 to move downwards so as to enable the main valve core 2 to synchronously move downwards to open the main valve seat 13.

In order to realize constant medium pressure flowing through the main valve body 1, a third accommodating chamber 32 is formed in the pilot valve seat 3, the third accommodating chamber 32 is arranged above the second accommodating chamber 31, a diaphragm 34 is fixed in the third accommodating chamber 32, the lower end of the adjusting member 6 abuts against the upper end of the diaphragm 34, and the upper end of the pilot valve core 4 abuts against the lower end of the diaphragm 34. The movable end of the adjusting piece 6 moves downwards and pushes the pilot valve core 4 to move downwards; at this time, the first accommodating chamber 30 and the second accommodating chamber 31 are communicated, and the high-pressure medium at the left side of the main valve body 1 is suitable for entering the first accommodating chamber 30 and the second accommodating chamber 31 after passing through the first flow channel 10 and being filtered by the filter screen 72; medium flows into the piston cylinder sleeve 12 through the linkage flow passage 36, the medium is suitable for pushing the linkage piston 5 to move downwards to the maximum stroke, the linkage piston 5 moves downwards to push the main valve core 2 to synchronously move downwards, so that the main valve core 2 can open the main valve seat 13, and at the moment, the opening of the main valve core 2 reaches the maximum value. After the medium at the liquid inlet end of the main valve body 1 flows into the liquid outlet end, the medium in the liquid outlet end of the main valve body 1 is suitable for flowing upwards into the third accommodating chamber 32 through the second flow channel 11, the medium is suitable for pushing the diaphragm 34 and the movable end of the adjusting piece 6 to move upwards, synchronously, the pilot valve spring 35 pushes the pilot valve core 4 to move upwards until the pressure of the medium in the third accommodating chamber 32 is balanced with the elasticity of the movable end of the adjusting piece 6 and the elasticity of the pilot valve spring 35, at the moment, the opening of the pilot valve core 4 is kept constant, so that the opening of the main valve core 2 is kept constant, the effect of adjusting the pressure of the liquid inlet end and the liquid outlet end of the main valve body 1 is achieved, and meanwhile, the pressure of the liquid outlet end of the main valve body 1 is reduced. When the membrane 34 moves upwards, the regulator 6 is pushed to move upwards synchronously, and the pilot valve core 4 is suitable for sealing the first containing bin 30 and the second containing bin 31. The main valve body 1 is provided with a second flow passage 11 near the liquid outlet end, the second flow passage 11 is communicated with the third accommodating chamber 32, and when the pressure of the liquid outlet end of the main valve body 1 is greater than that of the liquid inlet end, a medium flows into the third accommodating chamber 32 through the second flow passage 11 and can push the diaphragm 34 to move downwards.

The components (components not illustrating the specific structure) selected in the present utility model are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods. Moreover, the software program related to the utility model is the prior art, and the utility model does not relate to any improvement on the software program.

In the description of embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the several embodiments provided by the present utility model, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. A pilot pressure reducing valve for an inter-plant conveying system, comprising:

the automatic valve comprises a main valve body (1), a main valve core (2), a pilot valve seat (3), a pilot valve core (4), a linkage piston (5), an adjusting piece (6) and a filtering piece (7), wherein the pilot valve seat (3) is fixed on the main valve body (1), and the pilot valve seat (3) is communicated with the linkage piston (5) and the main valve body through a pilot runner;

the main valve core (2) is arranged in the main valve body (1) in a lifting manner, the main valve core (2) is linked with the linked piston (5), and the main valve core (2) is suitable for opening or closing the main valve body (1);

the adjusting piece (6) is fixed on the pilot valve seat (3), and the adjusting piece (6) is linked with the pilot valve core (4);

the pilot valve core (4) is arranged in the pilot valve seat (3) in a lifting manner, and is suitable for opening or closing the linkage piston (5);

the filter (7) is fixed on the side wall of the pilot valve seat (3), and the filter (7) is suitable for filtering and intercepting the medium flowing into the linkage piston (5).

2. A pilot pressure reducing valve for an inter-plant conveying system as set forth in claim 1, wherein,

a first accommodating bin (30) and a second accommodating bin (31) are arranged on the pilot valve seat (3), and the second accommodating bin (31) is arranged above the first accommodating bin (30);

the pilot valve core (4) is arranged in the first accommodating bin (30) in a lifting manner, and the pilot valve core (4) is suitable for adjusting the communication or closing of the first accommodating bin (30) and the second accommodating bin (31);

the pilot valve core (4) is linked with the adjusting piece (6); wherein,

rotating the adjusting member (6) is adapted to adjust the pilot valve core (4) to move upwards or downwards to bring the first receiving compartment (30) and the second receiving compartment (31) into communication or closure.

3. A pilot pressure reducing valve for an inter-plant conveying system as set forth in claim 2, wherein,

a transverse column (33) is fixed on the side wall of the pilot valve seat (3), and the interior of the transverse column (33) is hollow;

a first flow passage (10) is formed in the main valve body (1) close to the liquid inlet end, and the first flow passage (10) is communicated with the transverse column (33);

the transverse column (33) communicates with the first containing compartment (30).

4. A pilot pressure reducing valve for an inter-plant conveying system as set forth in claim 3, wherein,

the filter element (7) comprises: a sealing stud (71) and a filter screen (72), wherein the sealing stud (71) is matched with the transverse column (33), and the sealing stud (71) is suitable for sealing the transverse column (33);

the filter screen (72) is detachably arranged in the transverse column (33), and one end of the filter screen (72) is abutted with the side wall of the transverse column (33); the filter screen (72) is adapted to filter and intercept impurities in the medium flowing to the containing bin.

5. The pilot pressure reducing valve for an inter-plant conveying system as claimed in claim 4, wherein,

the filter screen (72) is hollow and open and cylindrical, and the opening of the filter screen (72) faces the sealing stud (71);

a plurality of filtering holes are formed in the outer wall and the bottom wall of the filter screen (72), and the filtering holes are suitable for filtering fixed impurities in the interception medium.

6. The pilot pressure reducing valve for an inter-plant conveying system as claimed in claim 5, wherein,

a piston cylinder sleeve (12) is fixed in the main valve body (1), the piston cylinder sleeve is matched with the linkage piston (5),

the piston cylinder sleeve is communicated with the second accommodating bin (31), wherein,

when the valve guide core (4) moves downwards, the medium in the first accommodating bin (30) is suitable for flowing into the piston cylinder sleeve, and pushes the linkage piston (5) to move downwards, so that the main valve core (2) moves downwards synchronously to open the main valve body.

7. The pilot pressure reducing valve for an inter-plant conveying system as claimed in claim 6, wherein,

a third accommodating bin (32) is arranged on the pilot valve seat (3), a membrane (34) is fixed in the third accommodating bin (32), the lower end of the adjusting piece (6) is propped against the upper end of the membrane (34), and the upper end of the pilot valve core (4) is propped against the lower end of the membrane (34); wherein,

when the diaphragm (34) moves upwards, the regulating piece (6) is pushed to synchronously move upwards, and the valve guide core (4) is suitable for sealing the first accommodating bin (30) and the second accommodating bin (31).

8. The pilot pressure reducing valve for an inter-plant conveying system according to claim 7, wherein,

a second flow passage (11) is arranged on the main valve body near the liquid outlet end, the second flow passage (11) is communicated with the third accommodating bin (32), wherein,

when the pressure of the liquid outlet end of the main valve body is larger than that of the liquid inlet end, the medium flows into the third accommodating bin (32) through the second flow channel (11) and can push the diaphragm (34) to move downwards.