CN212564588U

CN212564588U - Pilot-operated type dynamic differential pressure balance valve

Info

Publication number: CN212564588U
Application number: CN202021750409.2U
Authority: CN
Inventors: 李春生; 米培杰; 施明莉; 米歇尔·西格蒙德·恩尔贝尔特
Original assignee: Oventrop China Hvac Technology Co ltd
Current assignee: Oventrop China Hvac Technology Co ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2021-02-19
Anticipated expiration: 2030-08-20

Abstract

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, including main valve subassembly and pilot valve subassembly, the main valve subassembly includes the main valve body, the main valve upper cover, the main valve piston cylinder, the main valve piston, main valve elastic component and main valve core, the main valve import is connected with the load system rear end, be equipped with the main valve mouth between main valve export and the main valve import, the main valve piston separates the inner chamber of main valve piston cylinder for main valve epicoele and main valve cavity of resorption, main valve cavity of resorption and main valve export intercommunication, the pilot valve subassembly includes the pilot valve body, the pilot valve gap, the pilot piston, the pilot valve case, pilot elastic component and regulating spindle, the pilot piston separates the inner chamber of pilot valve body for pilot valve epicoele and pilot valve cavity of resorption, pilot valve epicoele and the sealed intercommunication of main. The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, the pilot valve is small, and easy installation is dismantled, has adopted the mode of pilot valve control main valve, has improved control accuracy, makes system's pressure differential more stable.

Description

Pilot-operated type dynamic differential pressure balance valve

Technical Field

The utility model relates to a dynamic differential pressure balanced valve especially relates to a guide's formula dynamic differential pressure balanced valve.

Background

In central heating and cooling systems, dynamic pressure differential balance valves are typically installed to maintain a constant pressure differential between two points in the water system piping. The dynamic differential pressure balance valve generally adopts a direct-acting diaphragm adjusting mode, the pressures in front of and behind the controlled system are respectively transmitted to two sides of the pressure sensing diaphragm, and when the differential pressure in front of and behind the controlled system changes, the differential pressure is fed back to the pressure sensing diaphragm and directly drives the valve core to move, so that the opening degree of the valve is changed. And the valve core is closed when the pressure difference is increased, otherwise, the valve core is opened when the pressure difference is reduced, so that the pressure difference of the controlled system is kept unchanged. The existing dynamic differential pressure balance valve is generally large in size, and particularly, a diaphragm part occupies a large space, so that the installation, the maintenance and the replacement are inconvenient; and the control of the pressure difference is not accurate enough, and the pressure difference control performance is not ideal enough.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve not enough among the prior art and accomplish, the utility model aims at providing a guide's formula dynamic pressure difference balanced valve, whole volume and highly reducing, the pilot valve is small, and easy installation is dismantled, has adopted the mode of pilot valve control main valve on pressure differential control, has effectively improved control accuracy, makes system's pressure differential more stable.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, including main valve subassembly and pilot valve subassembly, the main valve subassembly includes the main valve body, main valve upper cover, main valve piston cylinder, main valve piston, main valve elastic component and main valve core, the main valve export and the main valve import have been seted up respectively to the left and right sides of the main valve body, the main valve import is connected with load system rear end, be equipped with the main valve mouth between the main valve export and the main valve import, the main valve upper cover can be dismantled sealed the fixing in the upper portion of the main valve body, the main valve piston cylinder passes through the main valve upper cover sealed crimping is fixed in the upper portion of the main valve body, the main valve piston is along axially reciprocating movable formula locating in the main valve piston cylinder, the outer wall of main valve piston with the sealed slip counterbalance of the inner wall of main valve piston cylinder, the main valve piston with the inner chamber of main valve piston cylinder, the main valve elastic part is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic part are respectively abutted against the lower surface of the main valve piston and the bottom of the main valve piston cylinder, the main valve lower cavity is communicated with the main valve outlet, the upper part of the main valve core is axially and reciprocatingly movably arranged at the bottom of the main valve piston cylinder in a penetrating way, the upper end of the main valve core is detachably and fixedly connected with the lower part of the main valve piston, the bottom of the main valve core is detachably abutted against the main valve port, the main valve inlet is communicated with the main valve outlet in an opening and closing way through the main valve port, the pilot valve component comprises a pilot valve body, a pilot valve cover, a pilot piston, a pilot valve core, a pilot elastic part and an adjusting shaft, the pilot valve cover is detachably and hermetically fixed at the bottom of the pilot valve body, and, the pilot piston and the pilot valve core are respectively arranged in the pilot valve body in an axially reciprocating manner, the outer wall of the pilot piston is abutted against the inner wall of the pilot valve body in a sealing and sliding manner, the pilot piston divides the inner cavity of the pilot valve body into a pilot upper cavity and a pilot lower cavity from top to bottom in sequence, the pilot upper cavity is hermetically communicated with the main valve inlet, the pilot lower cavity is hermetically communicated with the front end of a load system, the adjusting shaft is arranged at the top of the pilot valve body in a reciprocating manner in an axially sealing manner, the pilot elastic part is arranged in the pilot upper cavity, the upper end and the lower end of the pilot elastic part are respectively abutted against the lower end of the adjusting shaft and the upper surface of the pilot piston, the lower surface of the pilot piston is fixedly connected with the upper end of the pilot valve core or integrally formed, and the lower end of the pilot valve core is abutted against the pilot outlet, the pilot valve lower cavity is communicated with the main valve upper cavity in an openable and closable manner through the pilot valve outlet.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve can also be:

the lower end of the adjusting shaft is provided with a spring seat, the upper part of the spring seat is abutted against the lower end of the adjusting shaft, and the lower surface of the spring seat is abutted against the upper end of the pilot elastic piece.

The main valve elastic part is a main valve spring, the main valve spring is sleeved on the upper portion of the main valve core, the upper end of the main valve spring abuts against the lower surface of the main valve piston, and the lower end of the main valve spring abuts against the bottom of the main valve piston cylinder.

The main valve assembly comprises a closing shaft used for turning off the main valve assembly, the closing shaft is axially sealed and movably arranged in the upper main valve cover in a reciprocating mode, the lower end of the closing shaft is arranged in the upper main valve cavity in a penetrating mode, and the lower end of the closing shaft is in releasable abutting contact with the upper surface of the main valve piston.

And a first pressure guide port communicated with the pilot valve lower cavity is arranged on the outer wall of the lower part of the pilot valve body, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guide port.

The outer wall of the upper part of the pilot valve body is provided with a second pressure guide port communicated with the pilot valve upper cavity, the outer wall of the main valve body close to one side of the main valve inlet is provided with a third pressure guide port communicated with the main valve inlet, and the second pressure guide port is communicated with the third pressure guide port in a sealing manner.

The main valve piston is provided with a damping hole which is communicated along the axial direction, and the upper main valve cavity is communicated with the lower main valve cavity through the damping hole.

The pilot valve assembly comprises an adjusting hand wheel used for driving the adjusting shaft to axially reciprocate, and the lower part of the adjusting hand wheel is in threaded connection with the upper part of the adjusting shaft.

And a pressure measuring port for testing the outlet pressure of the main valve component is arranged on the outer wall of the main valve body close to one side of the main valve outlet, and the pressure measuring port is communicated with the main valve outlet.

The bottom of the main valve piston cylinder is provided with a main valve flow guide opening, and the main valve lower cavity is communicated with the main valve outlet through the main valve flow guide opening. The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, including main valve subassembly and pilot valve subassembly, the main valve subassembly includes the main valve body, main valve upper cover, main valve piston cylinder, main valve piston, main valve elastic component and main valve core, the main valve export and the main valve import have been seted up respectively to the left and right sides of the main valve body, the main valve import is connected with load system rear end, be equipped with the main valve mouth between the main valve export and the main valve import, the main valve upper cover can be dismantled sealed the fixing in the upper portion of the main valve body, the main valve piston cylinder passes through the main valve upper cover sealed crimping is fixed in the upper portion of the main valve body, the main valve piston is along axially reciprocating movable formula locating in the main valve piston cylinder, the outer wall of main valve piston with the sealed slip counterbalance of the inner wall of main valve piston cylinder, the main valve piston with the inner chamber of main valve piston cylinder, the main valve elastic part is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic part are respectively abutted against the lower surface of the main valve piston and the bottom of the main valve piston cylinder, the main valve lower cavity is communicated with the main valve outlet, the upper part of the main valve core is axially and reciprocatingly movably arranged at the bottom of the main valve piston cylinder in a penetrating way, the upper end of the main valve core is detachably and fixedly connected with the lower part of the main valve piston, the bottom of the main valve core is detachably abutted against the main valve port, the main valve inlet is communicated with the main valve outlet in an opening and closing way through the main valve port, the pilot valve component comprises a pilot valve body, a pilot valve cover, a pilot piston, a pilot valve core, a pilot elastic part and an adjusting shaft, the pilot valve cover is detachably and hermetically fixed at the bottom of the pilot valve body, and, the pilot piston and the pilot valve core are respectively arranged in the pilot valve body in an axially reciprocating manner, the outer wall of the pilot piston is abutted against the inner wall of the pilot valve body in a sealing and sliding manner, the pilot piston divides the inner cavity of the pilot valve body into a pilot upper cavity and a pilot lower cavity from top to bottom in sequence, the pilot upper cavity is hermetically communicated with the main valve inlet, the pilot lower cavity is hermetically communicated with the front end of a load system, the adjusting shaft is arranged at the top of the pilot valve body in a reciprocating manner in an axially sealing manner, the pilot elastic part is arranged in the pilot upper cavity, the upper end and the lower end of the pilot elastic part are respectively abutted against the lower end of the adjusting shaft and the upper surface of the pilot piston, the lower surface of the pilot piston is fixedly connected with the upper end of the pilot valve core or integrally formed, and the lower end of the pilot valve core is abutted against the pilot outlet, the pilot valve lower cavity is communicated with the main valve upper cavity in an openable and closable manner through the pilot valve outlet. Therefore, the dynamic differential pressure balance valve comprises a main valve component and a pilot valve component, wherein the main valve component and the pilot valve component are both in piston structures, the pilot valve component comprises a pilot valve cover, a pilot valve body, a pilot piston, a pilot valve core, an adjusting shaft and the like, the front end of a load system is communicated with a pilot valve lower cavity, and the pressure of the front end of the load system is transmitted to the pilot valve lower cavity; the main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve core and the like, wherein the main valve upper cavity is communicated with the pilot valve outlet, specifically, a communication hole can be formed in the main valve upper cover and is used for communicating the main valve upper cavity with the pilot valve outlet, and the main valve inlet is communicated with the pilot valve upper cavity, namely, the pressure at the rear end of the load system is transmitted to the pilot valve upper cavity. When the valve set value is unchanged and is in a stable working state, the pilot valve core and the main valve core are respectively in a certain opening position, fluid with pressure P1 at the front end of the load system enters the lower pilot valve cavity, upwards extrudes the lower surface of the pilot valve piston, then enters the upper main valve cavity through the pilot valve outlet, and downwards extrudes the upper surface of the main valve piston, fluid with pressure P2 at the rear end of the load system reaches the inlet of the main valve and then is divided into two paths, one path enters the upper pilot valve cavity and downwards extrudes the upper surface of the pilot piston, the pilot piston reaches balance under the action of the fluid pressure at the upper side and the lower side and the elastic force of the pilot elastic piece at the moment, the other path passes through the main valve port through the inlet of the main valve and then reaches the outlet of the main. When the valve setting value is unchanged and the differential pressure Δ P (P1-P2) at the two ends of the load system is increased, the pressure difference of the fluid at the two sides of the pilot piston is larger than the elastic force of the pilot elastic piece, the pilot piston moves upwards to increase the opening degree of the pilot valve core, so that the pressure of the upper cavity of the main valve is increased, the piston of the main valve moves downwards under the thrust of the fluid of the upper cavity of the main valve core, the opening degree of the main valve core is reduced, the pressure P2 at the rear end of the load system is increased, and finally the Δ P is reduced. When the set value of the valve is unchanged and the differential pressure delta P at the two ends of the load system is reduced, the pressure of fluid at the two sides of the pilot piston is smaller than the elastic force of the pilot elastic piece, the pilot elastic piece pushes the pilot piston to move downwards to reduce the opening of the pilot valve core, so that the pressure of the upper cavity of the main valve is reduced, the main valve piston moves upwards under the thrust action of the main valve elastic piece, the opening of the main valve core is increased, the pressure P2 at the rear end of the load system is reduced, and finally the delta P is increased to the set value. In addition, the whole pilot valve subassembly from top to bottom is from the right side left slope setting, and the main valve piston cylinder of main valve subassembly from top to bottom is from the left side right slope setting to the pilot valve subassembly passes through the pilot valve lid and can dismantle to be fixed in on the main valve upper cover of main valve subassembly, compact structure. Like this, the change of load system pressure differential feeds back the pilot valve subassembly earlier, and the opening that rethread pilot valve subassembly controlled the main valve subassembly changes to this reaches the purpose of control load system pressure differential, compares in present direct-acting diaphragm formula dynamic pressure difference balanced valve, and the whole volume of this valve reduces greatly, and the whole height of valve reduces, especially the pilot valve part, and is small, easily installation dismantles, has adopted the mode of pilot valve control main valve in pressure differential control, has effectively improved control accuracy, makes system pressure differential more stable. Compared with the prior art, the utility model discloses a guide's formula dynamic pressure difference balanced valve has following advantage: the whole volume and the height are reduced, the pilot valve is small in size and easy to install and detach, the mode that the pilot valve controls the main valve is adopted in the pressure difference control, the control precision is effectively improved, and the system pressure difference is more stable.

Drawings

Fig. 1 is a schematic structural view of the pilot dynamic differential pressure balance valve of the present invention.

Fig. 2 is a schematic sectional view taken along line a-a in fig. 1.

Description of the figures

1 … pilot valve body 2 … first pilot pressure port 3 … pilot piston

4 … pilot spring 5 … spring seat 6 … regulating shaft

7 … pilot spool 8 … third pilot port 9 … orifice

10 … main valve piston 11 … main valve spring 12 … main valve spool

13 … master valve piston cylinder 14 … master valve body 15 … master valve upper cover

16 … pilot valve cover 17 … pressure taking port 18 … closing shaft

19 … communicating with the bore 20 … the pilot valve assembly 21 … the main valve assembly

22 … second pilot port 23 … main pilot port 24 … pilot port

25 … handwheel 26 … main valve inlet 27 … main valve outlet

28 … Pilot valve outlet

Detailed Description

In the present invention, if directions (up, down, left, right, inside and outside) are described, the structure shown in fig. 2 is used as a reference for description, but the practical direction of the present invention is not limited thereto. Wherein, the pilot valve assembly 20 is on the top, and the main valve assembly 21 is on the bottom; the main valve outlet is on the left, and the main valve inlet is on the right; the pilot piston 2 is inside and the pilot valve body 1 is outside.

The following describes a pilot dynamic differential pressure balancing valve according to the present invention in further detail with reference to fig. 1 to 2.

The pilot dynamic differential pressure balance valve of the present invention, please refer to fig. 1 to fig. 2, includes a main valve assembly 21 and a pilot valve assembly 20, wherein the main valve assembly 21 includes a main valve body 14, a main valve upper cover 15, a main valve piston cylinder 13, a main valve piston 10, a main valve elastic member and a main valve core 12, a main valve outlet 27 and a main valve inlet 26 are respectively disposed on the left and right sides of the main valve body 14, the main valve inlet 26 is connected to the rear end of the load system, a main valve port is disposed between the main valve outlet 27 and the main valve inlet 26, the main valve upper cover 15 is detachably fixed on the upper portion of the main valve body 14 in a sealing manner, the main valve piston cylinder 13 is fixed in the upper portion of the main valve body 14 in a sealing manner by the main valve upper cover 15 in a sealing manner, the main valve piston 10 is disposed in the main valve piston cylinder 13 in an axially reciprocable manner, an outer, the main valve piston 10 divides the inner cavity of the main valve piston cylinder 13 into a main valve upper cavity and a main valve lower cavity in sequence from top to bottom, the main valve elastic member is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic member are respectively abutted against the lower surface of the main valve piston 10 and the bottom of the main valve piston cylinder 13, the main valve lower cavity is communicated with the main valve outlet 27, the upper part of the main valve core 12 is axially and reciprocatingly movably arranged at the bottom of the main valve piston cylinder 13 in a penetrating manner, the upper end of the main valve core 12 is detachably and fixedly connected with the lower part of the main valve piston 10, the bottom of the main valve core 12 is detachably abutted against the main valve port, the main valve inlet 26 is communicated with the main valve outlet 27 in an opening and closing manner through the main valve port, and the pilot valve component 20 comprises a pilot valve body, Guide's elastic component and regulating shaft 6, guide's valve gap 16 can be dismantled sealed and be fixed in the bottom of guide's valve body 1, the pilot valve export 28 that link up is seted up to guide's valve gap 16 central authorities, guide's piston 2 with guide's case 7 respectively along axial reciprocating type set up in guide's valve body 1, guide's piston 2 outer wall with the inner wall of guide's valve body 1 is sealed to slide and offsets, guide's piston 2 will guide's valve body 1 inner chamber is separated for pilot valve epicoele and pilot valve cavity from last to down in proper order, the pilot valve epicoele with main valve import 26 is sealed to be communicated, pilot valve cavity and the sealed intercommunication of load system front end down, regulating shaft 6 is worn to locate along axial sealed reciprocating type guide's valve body 1 top, guide's elastic component is located in the pilot valve upper chamber, the upper and lower extreme of guide's elastic component respectively with the lower extreme of The lower surface of the pilot piston 2 is fixedly connected with or integrally formed with the upper end of the pilot valve core 7, the lower end of the pilot valve core 7 can be in releasable contact with a pilot valve outlet 28, and the pilot valve lower cavity is communicated with the main valve upper cavity in an openable and closable manner through the pilot valve outlet 28. Thus, the dynamic differential pressure balance valve comprises a main valve component 21 and a pilot valve component 20, wherein the main valve component 21 and the pilot valve component 20 are both in a piston structure, the pilot valve component 20 comprises a pilot valve cover 16, a pilot valve body 1, a pilot piston 2, a pilot valve core 7, an adjusting shaft 6 and the like, the front end of a load system is communicated with a pilot valve lower cavity, and the pressure of the front end of the load system is transmitted to the pilot valve lower cavity; the main valve assembly 21 includes a main valve body 14, a main valve upper cover 15, a main valve piston cylinder 13, a main valve piston 10, a main valve spool 12, and the like, wherein the main valve upper chamber is communicated with the pilot valve outlet 28, specifically, a communication hole 19 may be formed in the main valve upper cover 15 for communicating the main valve upper chamber with the pilot valve outlet 28, and a main valve inlet 26 is communicated with the pilot valve upper chamber, that is, the rear end pressure of the load system is transmitted to the pilot valve upper chamber. When the valve setting value is unchanged and is in a stable working state, the pilot valve core 7 and the main valve core 12 are respectively in a certain opening position, the fluid with the pressure of P1 at the front end of the load system enters the pilot valve lower cavity, and presses the lower surface of the pilot valve piston upwards, and then enters the main valve upper cavity through the pilot valve outlet 28, and presses the upper surface of the main valve piston 10 downwards, the fluid with the pressure of P2 at the rear end of the load system reaches the main valve inlet 26 and then is divided into two paths, one path enters the pilot valve upper cavity and presses the upper surface of the pilot piston 2 downwards, at this time, the pilot piston 2 reaches the balance under the action of the fluid pressure at the upper side and the lower side and the elastic force of the pilot elastic piece, the other path passes through the main valve inlet 26 and then reaches the main valve outlet 27, at. When the valve setting value is unchanged and the differential pressure Δ P (P1-P2) across the load system increases, the pressure difference between the two sides of the pilot piston 2 is greater than the elastic force of the pilot elastic member, the pilot piston 2 moves upward to increase the opening degree of the pilot valve spool 7, which increases the main valve upper chamber pressure, the main valve piston 10 moves downward under the thrust of the main valve upper chamber fluid, the opening degree of the main valve spool 12 decreases, which increases the load system rear end pressure P2, and finally Δ P decreases to the set value. When the valve setting value is unchanged and the differential pressure Δ P across the load system decreases, the pressure of the fluid on both sides of the pilot piston 2 is smaller than the elastic force of the pilot elastic member, the pilot elastic member pushes the pilot piston 2 to move downward to reduce the opening of the pilot spool 7, resulting in the pressure of the upper main valve chamber decreasing, the main valve piston 10 moves upward under the thrust of the main valve elastic member, the opening of the main spool 12 increases, causing the pressure P2 at the rear end of the load system to decrease, and finally increasing Δ P to the set value. The pilot valve assembly 20 is integrally inclined from the top to the bottom and from the right to the left, the main valve piston cylinder 13 of the main valve assembly 21 is inclined from the top to the bottom and from the left to the right, and the pilot valve assembly 20 is detachably fixed to the main valve upper cover 15 of the main valve assembly 21 through the pilot valve cover 16, so that the structure is compact. Therefore, the change of the differential pressure of the load system is fed back to the pilot valve component 20 firstly, and then the change of the opening degree of the main valve component 21 is controlled through the pilot valve component 20, so that the purpose of controlling the differential pressure of the load system is achieved. Compared with the prior art, the utility model discloses a guide's formula dynamic pressure difference balanced valve has following advantage: the integral volume and the height are reduced, the pilot valve body 1 is small in size and easy to install and detach, the mode that the pilot valve controls the main valve is adopted in the pressure difference control, the control precision is effectively improved, and the system pressure difference is more stable.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the lower end of the adjusting shaft 6 is provided with a spring seat 5, the upper part of the spring seat 5 is abutted against the lower end of the adjusting shaft 6, and the lower surface of the spring seat 5 is abutted against the upper end of the pilot elastic member. In this way, the lower end of the adjusting shaft 6 is provided with a pilot spring 4 seat for installing a pilot elastic member, and the pilot elastic member may be a pilot spring 4 for providing an elastic force for the pilot piston 2.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the main valve elastic part is a main valve spring 11, the main valve spring 11 is sleeved on the upper portion of the main valve core 12, the upper end of the main valve spring 11 abuts against the lower surface of the main valve piston 10, and the lower end of the main valve spring 11 abuts against the bottom of the main valve piston cylinder 13. Thus, the main valve spring 11 provides elasticity for the main valve piston 10, the main valve spring 11 is sleeved on the main valve core 12, the arrangement is reasonable, and the main valve spring 11 is installed stably.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the main valve assembly 21 includes a closing shaft 18 for closing the main valve assembly 21, the closing shaft 18 is axially and reciprocally disposed in the main valve upper cover 15 in a sealing manner, a lower end of the closing shaft 18 is disposed in the main valve upper chamber, and a lower end of the closing shaft 18 is releasably abutted against an upper surface of the main valve piston 10. In this way, the valve can be shut off by rotating the shut-off shaft 18. Specifically, the closing shaft 18 can be rotated clockwise by using an allen key, the closing shaft 18 moves downward and contacts with the main valve piston 10, and the main valve piston 10 and the valve core move downward under the pushing of the closing shaft 18 until the valve is closed; when the off function is not required, the close shaft 18 is rotated counterclockwise to the home position.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: and a first pressure guide port 2 communicated with the pilot valve lower cavity is arranged on the outer wall of the lower part of the pilot valve body 1, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guide port 2. In this way, the lower part of the pilot valve body 1 is provided with a first pressure guide port 2 for realizing the communication between the pilot valve lower cavity and the front end of the load system, and specifically, the first pressure guide port 2 can be connected to the front end of the load through a pressure guide pipe.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the outer wall of the upper part of the pilot valve body 1 is provided with a second pressure guide port 22 communicated with the pilot valve upper cavity, the outer wall of the main valve body 14 close to one side of the main valve inlet 26 is provided with a third pressure guide port 8 communicated with the main valve inlet 26, and the second pressure guide port 22 is communicated with the third pressure guide port 8 in a sealing manner. Thus, the pilot valve body 1 and the main valve body 14 are respectively provided with a second pressure guide port 22 and a third pressure guide port 8 for realizing communication between the main valve inlet 26 and the pilot valve upper chamber, that is, the load system rear end pressure P2 reaches the pilot valve upper chamber through the second pressure guide port 22. The second pressure guide port 22 and the third pressure guide port 8 can be in sealed communication through a pressure guide pipe.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the main valve piston 10 is provided with a damping hole 9 which is through along the axial direction, and the upper main valve cavity is communicated with the lower main valve cavity through the damping hole 9. In this way, the main valve piston 10 is provided with the orifice 9 for reducing the pressure of the fluid, so as to improve the stability of the operation of the main valve piston 10.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the pilot valve assembly 20 comprises an adjusting hand wheel 25 for driving the adjusting shaft 6 to reciprocate along the axial direction, and the lower part of the adjusting hand wheel 25 is in threaded connection with the upper part of the adjusting shaft 6. In this way, by rotating the adjusting hand wheel 25 to control the set pressure difference value, specifically, when the hand wheel 25 is rotated clockwise, the adjusting shaft 6 moves downward, the spring seat 5 is pushed to press the pilot spring 4, the pilot piston 2 moves downward due to the increase of the spring force, the opening degree of the pilot valve spool 7 decreases, the pressure in the main valve upper chamber decreases, the main valve piston 10 moves upward, the opening degree of the main valve spool 12 increases, the P2 decreases, and finally the set pressure difference value increases. Conversely, the hand wheel 25 is rotated counterclockwise to lower the pressure differential set point.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the outer wall of the main valve body 14 on the side close to the main valve outlet 27 is provided with a pressure measuring port 17 for testing the outlet pressure of the main valve assembly 21, and the pressure measuring port 17 is communicated with the main valve outlet 27. Thus, the pressure take-off 17 is provided for testing the valve outlet pressure, i.e. the pressure at the main valve outlet 27.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the bottom of the main valve piston cylinder 13 is provided with a main valve diversion port 23, and the main valve lower cavity is communicated with the main valve outlet 27 through the main valve diversion port 23. Thus, the bottom of the main valve piston cylinder 13 is provided with a main valve pilot port 23, which communicates the main valve lower chamber with a main valve outlet 27.

The utility model discloses a pilot-operated formula dynamic pressure difference balanced valve, on the basis of the technical scheme of preceding description, please refer to fig. 1 to fig. 2, can also be: the axial cross-section of guide's piston 2 is "worker" font, the periphery wall on the upper portion of guide's piston 2 with the sealed slip of the inner wall of guide's valve body 1 offsets, the periphery wall on guide's piston 2 upper portion with the sealed slip of the inner wall of guide's valve body 1 offsets, guide's piston 2 upper portion will guide's valve body 1's inner chamber is separated for the pilot valve epicoele with the pilot valve cavity of resorption, the periphery wall of guide's piston 2 lower part with guide's valve body 1's outer wall slides and offsets, guide's valve water conservancy diversion mouth 24 that the axial link up is seted up to. Thus, the pilot piston 2 with the axial cross section in the shape of an "i" is more stable when reciprocating in the axial direction, the lower part of the pilot piston 2 is provided with a through pilot valve diversion port 24, so that the cavities above and below the lower part of the pilot piston 2 extending in the radial direction are communicated, and the liquid coming from the front end P1 of the load system flows into the pilot valve lower cavity and then reaches the pilot valve outlet 28 through the diversion port.

The above description is only for the specific embodiments of the present invention, but not for the scope of the present invention, all equivalent changes or modifications made according to the design spirit of the present invention should be considered as falling into the scope of the present invention.

Claims

1. A pilot-operated dynamic differential pressure balance valve, characterized by: comprises a main valve assembly and a pilot valve assembly,

the main valve component comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic part and a main valve core, wherein a main valve outlet and a main valve inlet are respectively arranged at the left side and the right side of the main valve body, the main valve inlet is connected with the rear end of a load system, a main valve port is arranged between the main valve outlet and the main valve inlet, the main valve upper cover is detachably, hermetically and fixedly arranged at the upper part of the main valve body, the main valve piston cylinder is hermetically and fixedly connected into the upper part of the main valve body through the main valve upper cover in a crimping manner, the main valve piston is arranged in the main valve piston cylinder in a reciprocating manner along the axial direction, the outer wall of the main valve piston is hermetically and slidably abutted against the inner wall of the main valve piston cylinder, the main valve piston divides an inner cavity, the upper end and the lower end of the main valve elastic part are respectively propped against the lower surface of the main valve piston and the bottom of the main valve piston cylinder, the lower cavity of the main valve is communicated with the outlet of the main valve, the upper part of the main valve core is axially and reciprocatingly movably arranged at the bottom of the main valve piston cylinder in a penetrating way, the upper end of the main valve core is detachably and fixedly connected with the lower part of the main valve piston, the bottom of the main valve core is propped against the main valve port in a releasing way, and the inlet of the main valve is communicated with the outlet of the main valve in an opening and closing way through,

the pilot valve component comprises a pilot valve body, a pilot valve cover, a pilot piston, a pilot valve core, a pilot elastic piece and an adjusting shaft, the pilot valve cover is detachably fixed at the bottom of the pilot valve body in a sealing manner, a through pilot valve outlet is formed in the center of the pilot valve cover, the pilot piston and the pilot valve core are respectively arranged in the pilot valve body in a reciprocating manner along the axial direction, the outer wall of the pilot piston is in sealing sliding contact with the inner wall of the pilot valve body, the pilot piston divides the inner cavity of the pilot valve body into a pilot upper cavity and a pilot lower cavity from top to bottom in sequence, the pilot upper cavity is in sealing communication with the inlet of the main valve, the pilot lower cavity is in sealing communication with the front end of a load system, the adjusting shaft is arranged at the top of the pilot valve body in a reciprocating manner along the axial direction, the upper end and the lower end of the pilot elastic piece are respectively abutted against the lower end of the adjusting shaft and the upper surface of the pilot piston, the lower surface of the pilot piston is fixedly connected with or integrally formed with the upper end of the pilot valve core, the lower end of the pilot valve core is detachably abutted against a pilot valve outlet, and the lower cavity of the pilot valve is communicated with the upper cavity of the main valve in an openable and closable manner through the pilot valve outlet.

2. The pilot operated dynamic differential pressure balanced valve of claim 1, wherein: the lower end of the adjusting shaft is provided with a spring seat, the upper part of the spring seat is abutted against the lower end of the adjusting shaft, and the lower surface of the spring seat is abutted against the upper end of the pilot elastic piece.

3. The pilot operated dynamic differential pressure balanced valve of claim 1, wherein: the main valve elastic part is a main valve spring, the main valve spring is sleeved on the upper portion of the main valve core, the upper end of the main valve spring abuts against the lower surface of the main valve piston, and the lower end of the main valve spring abuts against the bottom of the main valve piston cylinder.

4. The pilot operated dynamic differential pressure balanced valve of claim 1, wherein: the main valve assembly comprises a closing shaft used for turning off the main valve assembly, the closing shaft is axially sealed and movably arranged in the upper main valve cover in a reciprocating mode, the lower end of the closing shaft is arranged in the upper main valve cavity in a penetrating mode, and the lower end of the closing shaft is in releasable abutting contact with the upper surface of the main valve piston.

5. The pilot operated dynamic differential pressure balanced valve of claim 1, wherein: and a first pressure guide port communicated with the pilot valve lower cavity is arranged on the outer wall of the lower part of the pilot valve body, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guide port.

6. The pilot operated dynamic differential pressure balanced valve of claim 1, wherein: the outer wall of the upper part of the pilot valve body is provided with a second pressure guide port communicated with the pilot valve upper cavity, the outer wall of the main valve body close to one side of the main valve inlet is provided with a third pressure guide port communicated with the main valve inlet, and the second pressure guide port is communicated with the third pressure guide port in a sealing manner.

7. A pilot operated dynamic differential pressure equalization valve according to any of claims 1-6, characterized by: the main valve piston is provided with a damping hole which is communicated along the axial direction, and the upper main valve cavity is communicated with the lower main valve cavity through the damping hole.

8. A pilot operated dynamic differential pressure equalization valve according to any of claims 1-6, characterized by: the pilot valve assembly comprises an adjusting hand wheel used for driving the adjusting shaft to axially reciprocate, and the lower part of the adjusting hand wheel is in threaded connection with the upper part of the adjusting shaft.

9. A pilot operated dynamic differential pressure equalization valve according to any of claims 1-6, characterized by: and a pressure measuring port for testing the outlet pressure of the main valve component is arranged on the outer wall of the main valve body close to one side of the main valve outlet, and the pressure measuring port is communicated with the main valve outlet.

10. A pilot operated dynamic differential pressure equalization valve according to any of claims 1-6, characterized by: the bottom of the main valve piston cylinder is provided with a main valve flow guide opening, and the main valve lower cavity is communicated with the main valve outlet through the main valve flow guide opening.