Gas pressure reducing valve

Abstract

The application provides a gas pressure reducing valve, comprising: a valve body, an upper end surface of the valve body being provided with a containing groove; a side surface of the valve body being provided with an inlet hole and an outlet hole; a main valve core being arranged in the containing groove; a main valve core spring being arranged below the main valve core; one end of the main valve core spring being connected with the main valve core, and the other end of the main valve core spring being abutted with the containing groove; a main valve seat being connected with the main valve core; a gap being formed between the main valve core and the main valve seat; a top rod comprising a top end and a bottom end; the bottom end of the top rod penetrating through the main valve seat and abutting with the top end of the main valve core; a sensitive element being arranged in the containing groove; an exhaust valve core being connected with the sensitive element through a load spring; an exhaust valve seat being arranged above the sensitive element; an adjusting screw rod being arranged above the exhaust valve seat; the adjusting screw rod abutting with the exhaust valve core; and a force applying assembly being connected with the adjusting screw rod and used for providing an acting force to the adjusting screw rod. The gas pressure reducing valve has the advantages of fast response speed, high sensitivity and effective improvement of pressure response speed.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure gas supply technology, specifically, it relates to a gas pressure reducing valve; more specifically, it relates to a gas pressure reducing valve with a sensitive element for pressure regulation and self-unloading function. Background Technology

[0002] In high-pressure gas supply systems and equipment, gas pressure reducing valves are crucial components. They provide stable pressure values ​​to gas-consuming equipment even when the gas source pressure and output flow rate change. Therefore, the performance and reliability of pressure reducing valves are essential for ensuring the normal operation of the gas supply system. For the high-pressure, high-flow-rate gas supply system developed by our company, a pilot-operated pressure reducing valve controls the pressure of the main valve. However, this system suffers from slow pressure regulation response and high-pressure gas remaining in the pipeline downstream of the pressure reducing valve after system use, posing a significant safety hazard to operations. Summary of the Invention

[0003] The purpose of this invention is to provide a gas pressure reducing valve, which aims to solve the technical problems of existing pressure reducing valves having slow pressure regulation response speed and high-pressure gas remaining in the pipeline behind the pressure reducing valve after the system is used, posing a huge hidden danger to operational safety.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a gas pressure reducing valve, comprising: The valve body has a receiving groove on its upper end face and an inlet hole and an outlet hole on its side. The main valve core is disposed within the receiving groove; A main valve core spring is disposed below the main valve core; one end of the main valve core spring is connected to the main valve core, and the other end abuts against the receiving groove; The main valve seat is connected to the main valve core; a gap exists between the main valve core and the main valve seat. A push rod, the push rod having a top end and a bottom end; the bottom end of the push rod passes through the main valve seat and abuts against the top end of the main valve core; The sensitive element is disposed within the receiving groove. The exhaust valve core is connected to the sensitive element via a load spring; An exhaust valve seat is disposed above the sensitive element; An adjusting screw is positioned above the exhaust valve seat; the adjusting screw abuts against the exhaust valve core. A force-applying component, connected to the adjusting screw, is used to provide a force to the adjusting screw; In operation, high-pressure gas enters the valve body and is throttled and depressurized at the annular gap between the main valve core and the main valve seat.

[0005] Preferably, the flow direction of the throttled gas includes: flowing towards the outlet orifice and / or acting on the sensitive element and / or acting on the main valve core.

[0006] Preferably, when the outlet pressure drops to the set pressure value, the sensitive element is moved downward by the load spring, and pushes the main valve core to move downward against the spring force of the main valve core, and the pressure rises.

[0007] Preferably, when the outlet pressure exceeds the set pressure value, the sensitive element moves upward under force, and the main valve core moves upward simultaneously under the action of the main valve core spring return force, resulting in a pressure drop.

[0008] Preferably, the main valve seat is provided with an insertion hole for inserting the push rod part structure; when the push rod extends into the insertion hole, there is a certain gap between the outer side of the push rod and the inner wall of the insertion hole.

[0009] Preferably, the main valve receiving cavity includes a main valve core receiving section; the main valve core receiving section includes a short column portion and a long column portion, the bottom end of the short column portion is connected to the top end of the long column portion; the diameter of the short column portion is smaller than the diameter of the long column portion.

[0010] Preferably, the main valve core has two operating states. In the first operating state, the main valve core is located in a preset position, separating the short column portion from the long column portion. In the second operating state, the main valve core is moved away from the preset position, and the short column portion is connected to the long column portion.

[0011] Preferably, the force-applying component includes one or more of the following: pressure regulating handle, handle plug, vent screw, valve cover, pressure regulating sleeve, set screw, and pressure regulating spring.

[0012] Preferably, the main valve core is in the initial position, and under the action of the adjusting screw, the valve port between the main valve core and the main valve seat opens to a certain degree; the high-pressure gas in the inlet hole flows into the valve body and is discharged through the outlet hole.

[0013] Preferably, the sensitive element is a sensor structure.

[0014] The beneficial effects of the gas pressure reducing valve provided by this invention are as follows: Compared with the prior art, even small pressure changes in the gas supply system can be transmitted to the main valve core through the force-bearing surface of the sensitive element, facilitating the timely response of the pressure regulating spring to generate adjustment action, allowing the pressure to quickly return to the set state. This provides advantages such as fast response speed, high sensitivity, and effectively improved pressure response speed. The pressure regulating spring can be configured with high preload and relatively low stiffness, allowing for precise adjustment of the spring's output force during application, thereby achieving precise regulation of the pressure reducing valve's outlet pressure. When the outlet pressure abnormally rises above the set pressure or the gas supply system pressure needs to be reduced, the exhaust valve seat is pushed upward by the gas pressure. By adjusting the initial position of the exhaust screw, the exhaust valve core is held stationary by the screw and pin, and the exhaust valve port is automatically opened, releasing the high-pressure gas and providing a safe unloading function. When there is a special need for venting in the outlet gas path, the exhaust valve core can be opened by adjusting the exhaust screw, allowing the high-pressure gas to be manually released, thus providing an automatic unloading function. The pressure adjustment range can be controlled by the spring force of the spring structure. By replacing springs with different preloads and stiffnesses, different pressure regulation ranges can be met, allowing users to match the adjustment range and precision. Replacing the spring is simple: just loosen the threads between the valve cover and valve body to open the valve cover, remove the spring, and replace it. The adjustment process is straightforward. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a gas pressure reducing valve provided in an embodiment of the present invention; Figure 2 For along Figure 1 A schematic diagram of the structure viewed in section AA. Figure 3 This is a schematic diagram of a gas pressure reducing valve provided in an embodiment of the present invention, excluding the pressure regulating handle. Figure 4 This is a structural schematic diagram of a gas pressure reducing valve provided in an embodiment of the present invention, excluding the pressure regulating handle and valve body; Figure 5 This is a schematic diagram showing the locations of the high-pressure chamber and the low-pressure chamber; Figure 6 This is the application schematic diagram.

[0017] In the diagram: 1. Pressure regulating handle; 2. Handle plug; 3. Exhaust screw; 4. Valve cover; 5. Pressure regulating sleeve; 6. Set screw; 7. Pin; 8. Adjusting screw; 81. Pin receiving hole; 9. Pressure regulating spring; 10. Valve body; 11. Exhaust valve seat; 12. Exhaust valve core; 13. Sensitive element; 131. Abutment groove; 132. Mounting hole; 14. Push rod; 15. Main valve seat; 151. Insertion hole; 16. Main valve core; 17. Filter; 18. Main valve core spring; 19. Load spring. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] Please refer to the following: Figures 1 to 5 The present invention provides a gas pressure reducing valve. The gas pressure reducing valve integrates a sensitive element for pressure regulation and self-unloading functions. The gas pressure reducing valve includes: a valve body 10, a main valve core 16, a main valve seat 15, a push rod 14, a sensitive element 13, a pressure regulating spring 9, a pressure regulating handle 1, an exhaust valve core 12, a load spring 19, and an exhaust valve seat 11. Initially, under the action of the adjusting screw 8, the valve opening between the main valve core 16 and the main valve seat 15 is opened to a certain degree; high-pressure gas from the inlet flows into the valve body 10 through the main valve opening and is discharged through the outlet.

[0020] In operation, high-pressure gas enters the high-pressure chamber of the pressure reducing valve, where it is throttled and reduced in pressure at the annular gap between the main valve core 16 and the main valve seat 15. The throttled gas then enters the low-pressure chamber. It is divided into three paths: one flows to the pressure reducing valve outlet, one acts on the pressure-bearing surface of the sensitive element 13, and one enters the unloading chamber. The main valve core 16 is automatically adjusted in terms of valve opening by the force of the bottom main valve core spring 18, the inlet pressure, the top outlet pressure, and the load spring force 19. When the outlet pressure drops to the set pressure value, the sensitive element 13 moves downward under the action of the load spring 19, pushing the main valve core 16 downward against the elastic force of the main valve core spring 18, increasing the valve opening and raising the pressure. When the outlet pressure exceeds the set pressure value, the sensitive element 13 moves upward under the force, and the main valve core 16 moves upward simultaneously under the reset elastic force of the main valve core spring 18, decreasing the valve opening and lowering the pressure. In this balanced state, the pressure regulating valve achieves a stable output pressure.

[0021] Loosening or tightening the top pressure regulating handle 1 causes the adjusting screw 8 to rotate, and the pressure regulating sleeve 5 moves up or down under the threaded transmission, pushing the pressure regulating spring 9 to compress or stretch. Changing the elastic force of the pressure regulating spring 9 can adjust the outlet pressure.

[0022] When the outlet pressure rises abnormally and exceeds the outlet set pressure, the exhaust valve seat 11 is pushed upward by the gas pressure. The exhaust valve core 12 is limited and held stationary by the screw 3 and the pin shaft 7, and the exhaust valve port is automatically opened to discharge the high-pressure gas, playing a role in safe unloading.

[0023] When abnormal pressure rise occurs in the outlet gas path or the pressure of the gas supply system needs to be reduced, by adjusting the initial position of the exhaust screw 3, as the sensitive element 13 moves upward, the opening of the exhaust valve core can be automatically opened to discharge the high-pressure gas.

[0024] As a specific implementation manner of the embodiment of the present invention, please refer to Figures 1 to 5 , a receiving groove is provided on the upper end surface of the valve body 10, and the receiving groove is arranged towards the lower end surface of the valve body 10. An inlet hole is provided on the side surface of the valve body 10. The inlet hole is connected to the first communication position of the receiving groove. An outlet hole is provided on the side surface of the valve body 10. The outlet hole is connected to the second communication position of the receiving groove. The height of the second communication position is greater than the height of the first communication position. The receiving groove successively includes a main valve section, a pressure relief cavity section, and a valve cover connection section from bottom to top.

[0025] As a specific implementation manner of the embodiment of the present invention, please refer to Figures 1 to 5 , the filter 17 includes a housing provided at the bottom of the receiving groove, and a filter mesh structure is provided on the housing. The housing is in sealed contact with the side wall of the receiving groove. The housing is connected to the side wall of the receiving groove through a threaded structure. A main valve receiving cavity is provided on the upper end surface of the housing. The main valve receiving cavity successively includes a main valve seat receiving section and a main valve core receiving section from top to bottom. The cross-sectional shape of the main valve core receiving section is "convex" shaped. The cross-sectional shape of the main valve seat receiving section is rectangular. The top end of the main valve core receiving section is connected to the bottom end of the main valve seat receiving section. The main valve core 16 is arranged in the main valve core receiving section. The main valve core spring 18 is arranged in the main valve core receiving section. One end of the main valve core spring 18 is connected to the bottom end of the main valve core 16, and the other end abuts against the bottom surface of the main valve core receiving section. The main valve core receiving section includes a short column part and a long column part, and the bottom end of the short column part is connected to the top end of the long column part. The diameter of the short column part is smaller than the diameter of the long column part.

[0026] Specifically, the main valve core 16 has two usage states. In the first usage state, a partition end surface is provided on the main valve core 16, and the partition end surface is located at the uppermost end of the long column part, thereby partitioning the short column part and the long column part so that the short column part and the long column part are not connected. In the second usage state, the partition end surface of the main valve core 16 moves downward to release the partition of the short column part and the long column part, and the short column part and the long column part are restored to be connected.

[0027] As a specific implementation manner of the embodiment of the present invention, please refer to Figures 1 to 5, the cross-sectional shape of the main valve seat 15 is an inverted "convex" shape. A threaded structure is provided on the outer side of the main valve seat 15. The main valve seat 15 is connected and fixed to the main valve core 16 by extending into the main valve seat accommodation section and being threadedly connected to the side wall of the main valve seat accommodation section. A jack 151 is provided on the main valve seat 15. When the main valve seat 15 is connected to the main valve core 16, the jack 151 communicates with the main valve accommodation cavity. And the top surface of the main valve seat 15 is higher than the top surface of the housing.

[0028] The push rod 14 includes a top end and a bottom end. The bottom end of the push rod 14 extends into the jack 151 and abuts against the top end of the main valve core 16. The top end of the push rod 14 abuts against the sensitive element 13. When the push rod 14 extends into the jack 151, there is a certain gap between the outer side surface of the push rod 14 and the inner wall surface of the jack 151.

[0029] The sensitive element 13 is arranged in the accommodation groove and is located above the push rod 14. Abutting groove 131 is provided at the lower end of the sensitive element 13. The shape and size of the abutting groove 131 are larger than the size of the top end of the main valve seat 15. The top end of the push rod 14 abuts against the top surface of the abutting groove 131.

[0030] The cross-sectional shape of the sensitive element 13 is a "convex" shape. An installation hole 132 penetrating the sensitive element 13 in the up and down direction is provided on the sensitive element 13. The sensitive element 13 functions as a pressure transmission. The sensitive element 13 and the exhaust valve seat 11 are connected together by threads, and the pressure regulating spring structure is also installed on the exhaust valve seat 11; the lower force-bearing surface of the sensitive element 13 bears pressure, and this pressure is transmitted to the pressure regulating spring structure through the sensitive element 13 and the exhaust valve seat 11, and then the spring is compressed by the force and makes a responsive action.

[0031] As a specific implementation manner of the embodiment of the present invention, please refer to Figures 1 to 5 , the load spring 19 is arranged in the installation hole 132 and is limited in the installation hole 132. The exhaust valve core 12 is arranged in the installation hole 132, and the bottom of the exhaust valve core 12 is connected to the load spring 19.

[0032] An exhaust valve seat 11 is provided above the sensitive element 13. The cross-sectional shape of the exhaust valve seat 11 is a "convex" shape. A connecting groove for accommodating the protruding part on the sensitive element 13 is provided at the lower end of the exhaust valve seat 11. A pin shaft insertion hole penetrating the exhaust valve seat 11 in the up and down direction is provided on the exhaust valve seat 11. The pin shaft insertion hole communicates with the connecting groove.

[0033] When the exhaust valve seat 11 is installed above the sensitive element 13, the top of the exhaust valve core 12 extends out of the installation hole 13 and extends into the pin shaft insertion hole from the bottom.

[0034] An adjusting screw 8 is provided above the exhaust valve seat 11. The adjusting screw 8 has a pin receiving hole 81 that extends vertically through it. A pin 7 is inserted into the pin receiving hole 81, with its bottom end extending out of the hole and inserting into a pin insertion hole to abut against the exhaust valve core 12. A pressure adjusting sleeve 5 is fitted onto the adjusting screw 8. The pressure adjusting sleeve 5 is fixed to the adjusting screw 8 by a set screw 6. A valve cover 4 is fitted onto the adjusting screw 8, with its bottom end inserted into a receiving groove in the valve body 10, specifically, into the valve cover connecting section. An adjusting hole is provided on the side of the valve cover 4 to allow the set screw 6 to protrude.

[0035] The exhaust valve seat 11 is connected to the pressure adjusting sleeve 5 via the pressure adjusting spring 9. The pressure adjusting sleeve 5 has a "T" shaped cross-section. Specifically, one end of the pressure adjusting spring 9 is fitted onto the upper part of the exhaust valve seat 11, and the other end is fitted onto the lower part of the pressure adjusting sleeve 5.

[0036] The upper end of the adjusting screw 8 is provided with an outer ring. The adjusting screw 8 is connected to the pressure adjusting handle 1 through the outer ring. The pressure adjusting handle 1 has a cylindrical structure. One end of the pressure adjusting handle 1 is an open end, and the other end is a connecting end. A plug mounting hole is provided on the connecting end. A handle plug 2 can be installed on the plug mounting hole.

[0037] The pressure regulating handle 1 is sleeved on the valve cover 4 through its open end. The top end of the adjusting screw 8 extends into the plug mounting hole, and the pressure regulating handle 1 is connected to the outer ring of the adjusting screw 8 via a bolt structure. A vent screw 3 is installed at the top end of the pin receiving hole 81. The side wall of the pin receiving hole 81 is provided with a threaded structure. The vent screw 3 is connected to the pin receiving hole 81 via the threaded structure. Due to the presence of the threaded structure, the vent screw 3 can move vertically relative to the pin receiving hole 81, thereby adjusting the position of the vent screw 3 within the pin receiving hole 81. By adjusting the relative position of the vent screw 3, the length of the pin 7 extending out of the pin receiving hole 81 can be adjusted.

[0038] This invention provides a gas pressure reducing valve. Compared with existing technologies, even minute pressure changes in the gas supply system can be transmitted to the main valve core 16 through the force-bearing surface of the sensitive element 13. This facilitates a timely response from the pressure regulating spring 9, allowing the pressure to quickly return to the set state. It offers advantages such as fast response speed, high sensitivity, and improved pressure response speed. The pressure regulating spring 9 can be configured with high preload and relatively low stiffness, allowing for precise adjustment of its output force during application, thus achieving accurate regulation of the pressure reducing valve outlet pressure. When the outlet pressure abnormally rises above the set pressure or the gas supply system pressure needs to be reduced, the exhaust valve seat 11 is pushed upwards by the gas pressure. By adjusting the initial position of the exhaust screw 3, the exhaust valve core 12 is held stationary by the screw and pin, automatically opening the exhaust valve port to discharge high-pressure gas, thus providing a safe unloading function. When there is a special need for venting in the outlet gas path, adjusting the exhaust screw 3 opens the exhaust valve core 12, allowing the high-pressure gas to be manually discharged, thus providing an automatic unloading function. The pressure adjustment range can be controlled by the spring force of the spring structure. By replacing springs with different preloads and stiffnesses, different pressure regulation ranges can be met, allowing users to match the adjustment range and precision. Replacing the spring is simple: just loosen the threads between the valve cover 4 and the valve body 10 to open the valve cover 4, remove the spring, and replace it.

[0039] This invention provides a gas pressure reducing valve with a sensitive element for pressure regulation and self-unloading function, which is used for precise pressure control of the main pressure reducing valve and has the characteristics of fast response speed, high control accuracy and automatic unloading.

[0040] Please participate Figure 6 The working process of this pressure reducing valve is as follows: In the gas supply system, it acts as a pilot-stage pressure reducing valve, used in conjunction with the main-stage pressure reducing valve. The inlet of the pressure reducing valve is connected to the high-pressure gas source, and the outlet is connected to the external control port of the main-stage pressure reducing valve. The outlet of the main-stage pressure reducing valve is connected to the gas-consuming equipment. According to the needs of the gas-consuming equipment, the pressure of P2 is controlled by adjusting the output pressure of the pressure reducing valve (i.e., the set pressure). When the gas source pressure P1 is less than the set pressure, the output pressure of the pressure reducing valve equals the pressure of P1.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas pressure reducing valve, characterized in that, include: The valve body (10) has a receiving groove on its upper end face; the valve body (10) has an inlet hole and an outlet hole on its side. The main valve core (16) is disposed in the receiving groove; A main valve core spring (18) is disposed below the main valve core (16); one end of the main valve core spring (18) is connected to the main valve core (16), and the other end abuts against the receiving groove; The main valve seat (15) is connected to the main valve core (16); there is a gap between the main valve core (16) and the main valve seat (15); The push rod (14) includes a top end and a bottom end; the bottom end of the push rod (14) passes through the main valve seat (15) and abuts against the top end of the main valve core (16). The sensitive element (13) is disposed in the receiving groove. The exhaust valve core (12) is connected to the sensitive element (13) via a load spring (19); An exhaust valve seat (11) is disposed above the sensitive element (13); An adjusting screw (8) is positioned above the exhaust valve seat (11); the adjusting screw (8) abuts against the exhaust valve core (12); A force-applying component, connected to the adjusting screw (8), is used to provide force to the adjusting screw (8); In operation, high-pressure gas enters the valve body (10) and is throttled and depressurized at the annular gap between the main valve core (16) and the main valve seat (15).

2. The gas pressure reducing valve as described in claim 1, characterized in that, The flow direction of the throttled gas includes: flowing to the outlet orifice and / or acting on the sensitive element (13) and / or acting on the main valve core (16).

3. The gas pressure reducing valve as described in claim 2, characterized in that, When the outlet pressure drops to the set pressure value, the sensitive element (13) is moved down by the load spring (19) and pushes the main valve core (16) to move down against the elastic force of the main valve core spring (18), and the pressure rises.

4. The gas pressure reducing valve as described in claim 2, characterized in that, When the outlet pressure exceeds the set pressure value, the sensitive element (13) moves upward under force, and the main valve core (16) moves upward simultaneously under the reset force of the main valve core spring (18), and the pressure decreases.

5. The gas pressure reducing valve as described in claim 1, characterized in that, The main valve seat (15) is provided with a socket (151) for inserting part of the top rod (14); when the top rod (14) is inserted into the socket (151), there is a certain gap between the outer side of the top rod (14) and the inner wall of the socket (151).

6. The gas pressure reducing valve as described in claim 1, characterized in that, The main valve receiving cavity includes a main valve core receiving section; the main valve core receiving section has a short column portion and a long column portion, the bottom end of the short column portion is connected to the top end of the long column portion; the diameter of the short column portion is smaller than the diameter of the long column portion.

7. The gas pressure reducing valve as described in claim 6, characterized in that, The main valve core (16) has two usage states. In the first usage state, the main valve core (16) is located in a preset position to separate the short column and the long column. In the second usage state, the main valve core (16) leaves the preset position and the short column and the long column are connected.

8. The gas pressure reducing valve as described in claim 1, characterized in that, The force-applying components include one or more of the following: pressure regulating handle (1), handle plug (2), vent screw (3), valve cover (4), pressure regulating sleeve (5), set screw (6), and pressure regulating spring (9).

9. The gas pressure reducing valve as described in claim 1, characterized in that, The main valve core (16) is in the initial position. Under the action of the adjusting screw (8), the valve opening between the main valve core (16) and the main valve seat (15) is opened to a certain degree; the high-pressure gas in the inlet hole flows into the valve body (10) and is discharged from the outlet hole.

10. The gas pressure reducing valve according to any one of claims 1-9, characterized in that, The sensitive element (13) is a sensor structure.

Images