Pilot valve of pressure reducing valve

Abstract

The utility model discloses a pilot valve of a pressure reducing valve, which solves the problems of poor adjustability, low response speed and the like. Comprising a center rod, a guide valve seat, a valve ball, a bottom cover, a guide valve body, an inner spring and a tower spring, the guide valve seat is fixed to the guide valve body, a circulation channel is formed in the guide valve seat, the center rod movably penetrates through the circulation channel, the center rod is sleeved with the inner spring, and the elastic force of the inner spring acts on the center rod; the bottom cover is fixed to the bottom of the guide valve seat, the tower spring is installed in the bottom cover, the two ends of the tower spring abut against the bottom cover and the valve ball, the bottom end of the center rod abuts against the valve ball, and the valve ball is arranged at a channel opening of the circulation channel in a floating mode. An inlet of the pilot valve is formed in the bottom cover, an outlet of the pilot valve is located in the pilot valve body, and the circulation channel is communicated with the inlet of the pilot valve and the outlet of the pilot valve. A spherical sealing face is formed through the spherical valve ball, the complex technology of paired grinding of a conical face and a valve seat inclined face is avoided, and the sealing effect and the adjusting precision are further improved.

Description

Technical Field

[0001] The utility model relates to the field of pressure reducing valves, in particular to a pilot valve of a pressure reducing valve. Background Art

[0002] The pilot valve of the pressure reducing valve is the pressure control mechanism of the pressure reducing valve. The pilot valve is mainly used to sense the changes in downstream pressure, adjust the fluid pressure, and ensure that the downstream equipment or system operates under stable pressure conditions.

[0003] The patent document with authorization announcement number CN202812359U discloses a pilot valve for a pressure reducing valve, which includes an upper valve body and a lower valve body. An adjusting device is provided at the top of the upper valve body, and the lower end of the adjusting device is located in the upper valve body and is provided with a compression spring. An inlet and an outlet are provided on the lower valve body, and a vertical through hole is provided in the middle of the lower valve body, in which a center rod is slidably connected, and a throttling device is provided at the lower end of the center rod. A vertical sleeve is integrally provided at the upper end of the lower valve body, and a piston is cooperated in the sleeve, the lower end of the compression spring abuts against the upper surface of the piston, and the upper end of the center rod abuts against the lower surface of the piston; the throttling device includes a top cap, an extrusion spring and a conical surface arranged at the lower end of the center rod. However, the conical face seal needs to be ground together with the inclined sealing surface of the valve seat during assembly. If the grinding is not accurate, the adjustability of the pilot valve will be poor, the processing requirements will be high, and the reset of the center rod depends solely on the elastic force of the extrusion spring. Under pressure fluctuation conditions, the response speed is slow and it is difficult to stabilize. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a pilot valve of a pressure reducing valve to solve the problems of poor adjustability, slow response speed, etc.

[0005] The technical scheme of the utility model is as follows: the pilot valve comprises a center rod, a pilot valve seat, a valve ball, a bottom cover, a pilot valve body, an inner spring and a tower spring; the pilot valve seat is fixed on the pilot valve body, a flow channel is provided in the pilot valve seat, the center rod movably penetrates the flow channel, the inner spring is sleeved on the center rod and the elastic force of the inner spring acts on the center rod; the bottom cover is fixed to the bottom of the pilot valve seat, the tower spring is installed in the bottom cover, and the two ends of the tower spring are pressed on the bottom cover and the valve ball, the bottom end of the center rod is pressed against the valve ball, and the valve ball is floatingly arranged at the channel opening of the flow channel; the inlet of the pilot valve is provided on the bottom cover, the outlet of the pilot valve is located in the pilot valve body, and the flow channel is respectively communicated with the inlet of the pilot valve and the outlet of the pilot valve.

[0006] By adopting the above technical solution, a spherical sealing surface is formed by a spherical valve ball. This design not only simplifies the assembly process and avoids the complicated process of grinding the conical surface and the valve seat bevel, but also improves the sealing effect and adjustment accuracy. The reset of the center rod no longer relies solely on a single extrusion spring, but through the dual elastic force of the inner spring and the tower spring, a continuous restoring force is provided for the valve ball to ensure a rapid response to pressure changes. The dual spring design can significantly improve the response speed and control accuracy of the pilot valve under pressure fluctuation conditions.

[0007] In a possible design, a conical hole is provided at the inlet of the flow channel, the hole wall of the conical hole is in a conical shape with a gradually decreasing hole diameter, and the outer spherical surface of the valve ball contacts the conical hole to form a sealing fit.

[0008] With the above design, the tapered hole fits tightly against the outer spherical surface of the valve ball to form an automatically guided sealing surface. This structural method utilizes the natural fit of geometric shapes. Compared with flat seals or seals of other simple shapes, it can provide a more reliable sealing effect, reduce fluid leakage, and ensure the stable operation of the pilot valve under various pressure conditions.

[0009] In a possible design, a spherical pad is installed between the valve ball and the tower spring. The spherical pad fits the outer spherical surface of the valve ball and is spherical in shape. The edge of the spherical pad extends outward to form a pressure platform, and the tower spring presses on the pressure platform.

[0010] With the above design, the design of the spherical pad ensures that the force applied by the tower spring to the valve ball can be evenly distributed, which can prevent the pressure position of the tower spring from being skewed and guide the correct alignment between the tower spring and the valve ball. At the same time, the compression force of the tower spring can be more effectively transmitted to the valve ball, ensuring the rapid response of the pilot valve to pressure changes and improving the control accuracy and response speed.

[0011] In a possible design, a central depression is formed at the bottom end of the central rod, and the central depression matches the shape of the outer spherical surface of the valve ball.

[0012] With the above design, the center recessed design makes the contact between the center rod and the valve ball closer, which can better guide the valve ball positioning and avoid unnecessary jumping of the valve ball in a pressure fluctuation environment, which is beneficial to reduce noise and vibration, and at the same time reduce turbulence of the valve ball during fluid flow.

[0013] In a possible design, a limiting hole and a sliding hole are provided at the outlet of the circulation channel. The aperture of the limiting hole is smaller than that of the sliding hole, and the medium can flow through the sliding hole along the limiting hole; a sliding platform is integrally provided radially outwardly on the center rod, one end of the inner spring presses on the sliding platform, the sliding platform and the sliding hole form a sliding fit, and the sliding platform and the hole wall of the limiting hole are abutted against each other to form a limit.

[0014] With the above design, the center rod can move along its axial direction through the sliding movement between the sliding table and the sliding hole. The opening size of the flow channel is adjusted by the precise movement of the center rod to achieve control of the fluid flow. In addition, the limit hole ensures that the movement range of the center rod in the sliding hole does not exceed the predetermined safety limit, thereby avoiding sealing failure or component damage caused by excessive movement of the center rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model in a closed state;

[0016] Figure 2 It is a structural schematic diagram of the utility model in an open state;

[0017] Among them, 1. center rod; 2. pilot valve seat; 3. valve ball; 4. bottom cover; 5. pilot valve body; 6. inner spring; 7. tower spring; 8. flow channel; 81. conical hole; 82. limit hole; 83. sliding hole; 31. spherical pad; 311. pressure platform; 11. center depression; 12. sliding platform. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2 The pilot valve of a pressure reducing valve shown in the figure is arranged in the pressure reducing valve, and the fluid of the pressure reducing valve first passes through the pilot valve. The pilot valve includes a center rod 1, a pilot valve seat 2, a valve ball 3, a bottom cover 4, a pilot valve body 5, an inner spring 6 and a tower spring 7. The pilot valve seat 2 is fixed on the pilot valve body 5. A flow channel 8 is provided in the pilot valve seat 2. The center rod 1 movably passes through the flow channel 8. The flow channel 8 is also used for fluid to flow through. The inner spring 6 is sleeved on the center rod 1 and the elastic force of the inner spring 6 acts on the center rod 1. The bottom cover 4 is fixed to the bottom of the pilot valve seat 2. The tower spring 7 is installed in the bottom cover 4, and the two ends of the tower spring 7 press on the bottom cover 4 and the valve ball 3. The bottom end of the center rod 1 is pressed against the valve ball 3, and the valve ball 3 is floatingly arranged at the channel opening of the flow channel 8. The inlet of the pilot valve is provided on the bottom cover 4, and a number of through holes for fluid to pass through are evenly distributed on the bottom cover 4; the outlet of the pilot valve is located in the pilot valve body 5, and the flow channel 8 is connected to the inlet of the pilot valve and the outlet of the pilot valve respectively. The center rod 1 and the valve ball 3 adopt a split design, which is more convenient for processing and molding from a processing perspective, and does not require excessive grinding processes. The valve disc of the pilot valve is set to a spherical valve ball 3, which not only increases the sealing performance, but also improves the adjustability. The center rod 1 and the valve ball 3 actually have the elastic support of the inner spring 6 and the tower spring 7, so that the valve ball 3 can float closely following the pressure changes, ensuring a rapid response to pressure changes.

[0019] Under the adjustment of the pressure regulating mechanism of the pressure reducing valve, a certain pressure is applied to the center rod 1 to push the center rod 1 downward to a preset position, so that the center rod 1 pushes the valve ball 3 off the valve seat, so that the pilot valve is opened, and the upstream fluid enters the control device of the pressure reducing valve through the pilot valve and the pipeline, providing thrust for the main valve disc of the pressure reducing valve to open the pressure reducing valve. After being reduced in pressure by the pressure reducing valve, the high-pressure gas enters the use end behind the valve, providing the user with fluid of suitable pressure.

[0020] The inlet of the circulation channel 8 has a tapered hole 81, the hole wall of the tapered hole 81 is in a tapered shape with a gradually decreasing hole diameter, and the hole diameter gradually decreases from the inlet to the inside, and the outer spherical surface of the valve ball 3 contacts the tapered hole 81 to form a sealed fit. The special geometric structure of the tapered hole 81 allows the valve ball 3 to float freely within a certain range, so that the valve ball 3 can self-regulate according to the change of fluid pressure, and realize adaptive control of the opening size of the circulation channel 8, thereby optimizing the fluid flow and ensuring the stability of downstream pressure.

Claims

1. A pilot valve for a pressure reducing valve, characterized in that: It includes a center rod, a pilot valve seat, a valve ball, a bottom cover, a pilot valve body, an inner spring and a tower spring. The pilot valve seat is fixed on the pilot valve body, a flow channel is opened in the pilot valve seat, the center rod movably passes through the flow channel, the inner spring is sleeved on the center rod and the elastic force of the inner spring acts on the center rod; the bottom cover is fixed to the bottom of the pilot valve seat, the tower spring is installed in the bottom cover, and the two ends of the tower spring press on the bottom cover and the valve ball, the bottom end of the center rod is tightly pressed on the valve ball, and the valve ball is floatingly arranged at the channel opening of the flow channel; the inlet of the pilot valve is opened on the bottom cover, the outlet of the pilot valve is located in the pilot valve body, and the flow channel is respectively connected with the inlet and outlet of the pilot valve.

2. The pilot valve of the pressure reducing valve according to claim 1, characterized in that: The inlet of the circulation channel is provided with a tapered hole, the hole wall of the tapered hole is in a tapered shape with a gradually decreasing hole diameter, and the outer spherical surface of the valve ball contacts the tapered hole to form a sealing fit.

3. The pilot valve of the pressure reducing valve according to claim 1 or 2, characterized in that: A spherical pad is installed between the valve ball and the tower spring. The spherical pad fits the outer spherical surface of the valve ball and is in a spherical shape. The edge of the spherical pad extends outward to form a pressure platform, and the tower spring presses on the pressure platform.

4. The pilot valve of the pressure reducing valve according to claim 1 or 2, characterized in that: A central depression is formed at the bottom end of the central rod, and the central depression matches the shape of the outer spherical surface of the valve ball.

5. The pilot valve of the pressure reducing valve according to claim 1 or 2, characterized in that: The outlet of the circulation channel is provided with a limiting hole and a sliding hole, the aperture of the limiting hole is smaller than that of the sliding hole, and the medium can flow through the sliding hole along the limiting hole; the central rod is integrally provided with a sliding platform radially outward, one end of the inner spring is pressed against the sliding platform, the sliding platform forms a sliding fit with the sliding hole, and the sliding platform and the hole wall of the limiting hole are abutted to form a limit.

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