A welded water pressure reducing valve

Abstract

This utility model relates to a welded water pressure reducing valve. The valve body contains a piston cylinder and a piston that cooperates with the piston cylinder. A main spring is located inside the valve cover, and a valve seat is located on the valve stem. A pressure plate that cooperates with the valve seat is located above the valve seat, and a secondary spring is located below the valve seat. A lower pressure cover is located at the bottom of the valve body, and a secondary spring base is located on top of the lower pressure cover. The secondary spring is positioned between the valve seat and the lower pressure cover. The diameter of the main spring is larger than that of the secondary spring. In use, the thrust of the piston and the action of the various springs push the valve stem up and down, changing the opening of the piston cylinder outlet, causing a change in flow resistance, weakening the influence of the inlet pressure, and playing a pressure stabilizing role. This makes it more suitable for high-pressure pressure reduction applications and extends its service life.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure reducing valves, specifically a welded water pressure reducing valve. Background Technology

[0002] In the prior art, a pressure reducing valve is a device used to control fluid pressure, mainly used to reduce the pressure of a high-pressure water source to the required safe level in order to protect downstream equipment and pipeline systems.

[0003] In current pressure reducing valve structures, the pressure feedback chamber is mainly composed of a rubber diaphragm. Although this is inexpensive, the rubber diaphragm has low strength and cannot withstand frequent opening and closing over extended periods, resulting in a high maintenance rate. It also cannot withstand high pressure; under high pressure, the diaphragm will crack, making it unsuitable for high-pressure pressure reduction applications. Furthermore, existing valve discs lack a buffer spring on their lower support surface, which affects the stability of the pressure reduction action.

[0004] Therefore, there is an urgent need for a new type of welded water pressure reducing valve. Summary of the Invention

[0005] The purpose of this invention is to provide an improved welded water pressure reducing valve. Through structural improvements, the stability of the pressure reducing action is ensured, making it more suitable for high-pressure pressure reducing applications, while also extending its service life.

[0006] To achieve the above objectives, the technical solution of this utility model is: a welded water pressure reducing valve, which mainly includes a valve body, a valve cover connected to the valve body, and a valve stem disposed within the valve body. The valve body is characterized by: a piston cylinder and a piston cooperating with the piston cylinder within the valve body; a main spring within the valve cover; a valve seat on the valve stem; a pressure plate cooperating with the valve seat above the valve seat; and a secondary spring below the valve seat. A lower pressure cover is located at the bottom of the valve body, and a secondary spring base is located at the top of the lower pressure cover. The secondary spring is disposed between the valve seat and the lower pressure cover. The diameter of the main spring is larger than the diameter of the secondary spring.

[0007] Preferably, a valve cap is fitted on the top of the valve cover, the valve cover has a bolt hole that communicates with the valve cap, a hexagonal bolt is provided in the bolt hole, a spring seat that abuts against the hexagonal bolt is provided inside the valve cover, and the main spring is located between the spring seat and the piston.

[0008] Furthermore, a guide sleeve is provided between the piston cylinder and the valve stem. The guide sleeve has a T-shaped cross-section, and an O-ring is embedded on the side of the guide sleeve.

[0009] Furthermore, the piston has a raised step on top, and one end of the main spring is engaged with the raised step.

[0010] Furthermore, the pressure plate has a trapezoidal structure, and a valve seat sealing ring is provided between the pressure plate and the valve seat.

[0011] Furthermore, the valve body is equipped with inlet and outlet, and pressure gauge devices are installed on the outside of the inlet and outlet.

[0012] Compared with the prior art, the technical solution of this utility model not only improves the overall technical solution, but also includes many detailed improvements. Specifically, it has the following beneficial effects:

[0013] 1. The improved solution of this utility model includes a piston cylinder and a piston that cooperates with the piston cylinder in the valve body, a main spring in the valve cover, a valve seat on the valve stem, a pressure plate that cooperates with the valve seat above the valve seat, and a secondary spring below the valve seat; a lower pressure cover is provided at the bottom of the valve body, and a secondary spring base is provided at the top of the lower pressure cover. The secondary spring is located between the valve seat and the lower pressure cover. Through the thrust of the piston and the action of each stage of springs, the valve stem is pushed up and down, changing the opening of the piston cylinder outlet, causing a change in flow resistance (increase or decrease), weakening the influence of the inlet pressure, and restoring the outlet pressure of each stage to its original value, thus playing a stabilizing role.

[0014] 2. The technical solution of this utility model adopts an integral structure, with the valve body installed online as a whole, which makes replacement and maintenance convenient, safe and reliable, and at the same time, the installation accuracy is high, which can fully guarantee the integrity and reliability of the pressure reducing valve unit.

[0015] 3. The present invention has a reasonable structural layout, significant effects, great commercial value, and is easy to promote and utilize. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is another structural schematic diagram of an embodiment of the present utility model.

[0018] Figure label:

[0019] 1. Lower pressure cap, 2. Valve body, 3. Secondary spring, 4. Valve seat, 6. Pressure plate, 7. Valve stem, 9. Piston cylinder;

[0020] 11 Valve cover, 12 Main spring, 13 Spring seat, 14 Valve cap, 15 Hex bolt, 16 Hex nut, 17 Pressure gauge device;

[0021] 21 Piston, 22 Guide sleeve, 23 O-ring seal, 24 Valve seat seal. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] This utility model provides a welded water pressure reducing valve, which mainly includes a valve body 2, a valve cover 11 connected to the valve body, and a valve stem 7 disposed within the valve body. See details below. Figure 1 The difference between this and the existing technology is that: the valve body 2 is provided with a piston cylinder 9 and a piston 21 that cooperates with the piston cylinder; the valve cover is provided with a main spring 12; the valve stem is provided with a valve seat 4; the valve seat is provided with a pressure plate 6 that cooperates with the valve seat above it; and the valve seat is provided with a secondary spring 3 below it. The bottom of the valve body is provided with a lower pressure cover 1; the top of the lower pressure cover is provided with a secondary spring base; and the secondary spring is located between the valve seat and the lower pressure cover. The diameter of the main spring is larger than the diameter of the secondary spring.

[0024] In use, the pressure reducing valve of this utility model is equipped with a valve cover, a piston cylinder that matches the valve cover, and a guide sleeve 22 that matches the piston cylinder. A main spring is provided in the upper cavity and a secondary spring is provided in the lower cavity. Through the thrust of the piston and the action of each stage of springs, the valve stem is pushed up and down, changing the opening of the piston cylinder outlet, causing a change in flow resistance (increase or decrease), weakening the influence of the inlet pressure, and restoring the outlet pressure of each stage to its original value, thus playing a stabilizing role.

[0025] In practice, this utility model discloses a welded water pressure reducing valve, which mainly includes a valve body 2, a valve cover 11 connected to the valve body, and a valve stem 7 disposed within the valve body. Specifically, the valve body contains a piston cylinder 9 and a piston 21 that cooperates with the piston cylinder. A main spring 12 is disposed within the valve cover, a valve seat 4 is disposed on the valve stem, a pressure plate 6 that cooperates with the valve seat is disposed above the valve seat, and a secondary spring 3 is disposed below the valve seat. A lower pressure cover 1 is disposed at the bottom of the valve body, and a secondary spring base is disposed at the top of the lower pressure cover. The secondary spring is disposed between the valve seat and the lower pressure cover. The diameter of the main spring is larger than that of the secondary spring, and the ratio of the diameters of the main spring to the secondary spring is 1.5-3.5:1. Here, the main spring adopts a high-stiffness spring, a hard-seal valve seat, high pressure resistance, and wear resistance; the secondary spring adopts a high-precision low-stiffness spring, which has high pressure regulation accuracy and is sensitive to feedback pressure, enabling it to quickly respond to pressure changes, rapidly provide feedback, and stabilize the pressure setpoint.

[0026] This utility model adopts a symmetrical left-right arrangement structure, which not only facilitates operation but also saves vertical space for pipelines, meeting the space requirements of on-site working conditions. The bottom of the pressure reducing valve is equipped with a lower pressure cap 1, and components such as the valve stem spring are installed from the bottom. A packing seal is installed between the bottom cap and the valve body, increasing the overall sealing performance. This utility model allows for offline assembly and testing, offers ample space, good visibility, and high installation precision, ensuring the integrity and reliability of the pressure reducing valve. Furthermore, the integrated structure facilitates pipeline replacement and maintenance. Especially in this case study, where the installation space is limited and visibility is poor, it is more suitable for unitized operation of the pressure reducing components.

[0027] Preferably, a valve cap 14 is fitted on the top of the valve cover, the valve cover has a bolt hole that communicates with the valve cap, a hexagonal bolt 15 and a hexagonal nut 16 that mates with the hexagonal bolt are provided in the bolt hole, a spring seat 13 that abuts against the hexagonal bolt is provided inside the valve cover, and the main spring is located between the spring seat and the piston.

[0028] Furthermore, a guide sleeve 22 is provided between the piston cylinder and the valve stem. The guide sleeve has a T-shaped cross-section, and an O-ring seal 23 is embedded on the side of the guide sleeve. A raised step is provided on the top of the piston, and one end of the main spring is engaged with the raised step. The pressure plate has a trapezoidal structure, and a valve seat seal 24 is provided between the pressure plate and the valve seat.

[0029] Furthermore, the valve body is provided with an inlet and an outlet, and a pressure gauge device 17 is provided on the outside of the inlet and outlet.

[0030] The implementation of the above technologies has greatly improved the performance of pressure reducing valves, meeting the needs of special operating conditions in nuclear power plants, and represents a significant advancement compared to existing technologies.

[0031] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A soldered water pressure reducing valve mainly comprising a valve body, a bonnet connected to the valve body, and a valve stem provided in the valve body, characterized in that: The valve body contains a piston cylinder and a piston that cooperates with the piston cylinder. The valve cover contains a main spring, the valve stem contains a valve seat, the valve seat is equipped with a pressure plate that cooperates with the valve seat above it, and a secondary spring is equipped with a secondary spring below it. The bottom of the valve body contains a lower pressure cover, the top of the lower pressure cover contains a secondary spring base, and the secondary spring is located between the valve seat and the lower pressure cover. The diameter of the main spring is larger than the diameter of the secondary spring.

2. The welded water pressure reducing valve according to claim 1, characterized in that: A valve cap is fitted on the top of the valve cover. The valve cover has a bolt hole that communicates with the valve cap. A hexagonal bolt is installed in the bolt hole. A spring seat that abuts against the hexagonal bolt is installed inside the valve cover. The main spring is located between the spring seat and the piston.

3. The welded water pressure reducing valve according to claim 1, characterized in that: A guide sleeve is provided between the piston cylinder and the valve stem. The cross-section of the guide sleeve is T-shaped, and an O-ring is embedded on the side of the guide sleeve.

4. A welded water pressure reducing valve according to claim 1, characterized in that: The piston has a raised step on top, and one end of the main spring is engaged with the raised step.

5. A welded water pressure reducing valve according to claim 1, characterized in that: The pressure plate has a trapezoidal structure, and a valve seat sealing ring is provided between the pressure plate and the valve seat.

6. A welded water pressure reducing valve according to claim 1, characterized in that: The valve body has an inlet and an outlet, and a pressure gauge is installed on the outside of the inlet and outlet.

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