Cavitation-resistant pressure-reducing valve
By using a cavitation-resistant valve core and pressure-tapping pipe structure, the problems of cavitation and pressure oscillation in pressure reducing valves under high pressure differential conditions are solved, achieving smooth fluid pressure reduction and long-term stable operation of the valve.
Patent Information
- Application Number
- CN202522153098.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-11
AI Technical Summary
Conventional pressure reducing valves are prone to cavitation under high pressure differential and high flow conditions, which can damage the seals and cause pressure oscillations to lead to valve core oscillation and reduced pressure regulation accuracy.
It adopts a cavitation-resistant valve core and pressure tapping tube structure, achieves gradient pressure drop through an annular pressure reducing groove, and uses the pressure tapping tube to guide stable pressure to the piston, reducing cavitation and pressure oscillation.
It effectively reduces cavitation erosion of the valve core sealing surface by fluid, extends valve life, stabilizes outlet pressure, and improves pressure regulation accuracy.
Smart Images
Figure CN224680211U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve technology, specifically to a cavitation-resistant pressure reducing valve. Background Technology
[0002] Pressure reducing valves are key control devices widely used in industries such as petroleum, chemical, power, and metallurgy. Their core function is to stably reduce and regulate the high-pressure fluid at the inlet to the lower and more stable outlet pressure required by the equipment.
[0003] Currently, conventional pressure reducing valves have several inherent defects when handling high pressure differential and high flow conditions: 1. Severe Cavitation Problem: When high-pressure fluid flows through the narrow throttling orifice formed by the valve core and seat, the flow velocity increases sharply, and the pressure drops instantaneously. If the pressure drops below the fluid's saturated vapor pressure, a large number of cavitation bubbles will be generated in the fluid. These bubbles collapse rapidly as they flow downstream to the high-pressure zone, generating a huge local impact force, i.e., the "cavitation" phenomenon. Cavitation severely erodes and corrodes the valve core, seat, and its seals, leading to seal failure, internal leakage, and significantly shortening the valve's service life. Although using corrosion-resistant hard materials can alleviate this problem to some extent, it cannot fundamentally change the fluid decompression process, and cavitation damage will still occur.
[0004] 2. Pressure Oscillation and Control Instability: During high pressure differential pressure reduction, the fluid ejected from the throttling orifice possesses extremely high kinetic energy, resulting in highly turbulent and pulse-filled flow. Conventional pressure reducing valves directly feed the outlet pressure back to the diaphragm or piston's actuation chamber. This turbulent and impactful pressure signal causes the actuator to generate continuous high-frequency vibrations or oscillations, preventing the valve core from stabilizing at a stable equilibrium position. This leads to outlet pressure fluctuations, decreased pressure regulation accuracy, and even harsh noise. Utility Model Content
[0005] The purpose of this invention is to provide a cavitation-resistant pressure reducing valve to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a cavitation-resistant pressure reducing valve, comprising: a valve body, a valve seat, a cavitation-resistant valve core, a baffle, a valve stem, a pressure-feeding tube, and a piston; A valve cavity is formed inside the valve body; The valve seat is fixedly installed in the lower part of the valve cavity; The cavitation-resistant valve core is disposed above the valve seat, and the lower part of the cavitation-resistant valve core is provided with a sealing surface that cooperates with the valve seat to achieve sealing or opening. The lower end of the valve stem contacts the upper part of the cavitation-resistant valve core, and the upper end of the valve stem is connected to the piston. The surface of the cavitation-resistant valve core is provided with multiple annular pressure-reducing grooves to achieve a gradient decrease in fluid pressure; The baffle is fixed inside the valve cavity to prevent fluid from directly impacting the piston; one end of the pressure tap is connected to the stable pressure zone on the valve body outlet side, and the other end leads to the piston to guide the stable pressure to the piston to suppress oscillation.
[0007] Optionally, the annular pressure-reducing grooves of the cavitation-resistant valve core are distributed along the axial direction, and the groove cross-section is arc-shaped or stepped, which is used to gradually reduce the fluid pressure to reduce cavitation.
[0008] Optionally, the baffle is fixed to the valve body by an inner retaining ring, and the baffle is provided with a pressure tapping pipe interface; the pressure tapping pipe adopts a bent pipe structure.
[0009] Optionally, the pressure reducing valve includes an upper cover flange and a rear cover, the upper cover flange being connected to the valve body by fastening screws, and the rear cover being connected to the lower part of the valve body.
[0010] Optionally, the system also includes a spring assembly comprising an adjusting screw, an upper spring seat, an adjusting spring, and a lower spring seat. The top of the adjusting spring is connected to the upper spring seat, and the bottom is connected to the lower spring seat. The adjusting screw abuts against the upper spring seat to adjust the compression of the adjusting spring.
[0011] Optionally, the piston is provided with a screw mounting hole, in which a fixing screw is installed. The top of the fixing screw is connected to the lower spring seat, and the bottom is connected to the valve stem.
[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. By employing a cavitation-resistant valve core with a special annular groove structure, the one-time huge pressure drop of the fluid from high pressure to low pressure is transformed into a multiple, gradual pressure drop. The pressure difference at each stage is reduced, effectively lowering the fluid velocity and cavitation effect, fundamentally weakening the cavitation erosion and damage to the valve core sealing surface and sealing components, thereby significantly extending the service life of the valve under harsh operating conditions; 2. Through the pressure-sensing pipe structure, the pressure at the valve body outlet, which has undergone sufficient throttling and whose flow state has become stable laminar flow, is guided to the piston. This provides the piston with a stable, shock-free feedback pressure signal, avoiding piston jitter and valve core oscillation caused by drastic pressure fluctuations. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is a schematic diagram of the cavitation-resistant valve core structure of this utility model. Detailed Implementation
[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0016] like Figure 1 and 2 As shown, a cavitation-resistant pressure reducing valve includes a valve body 1, a valve seat 10, a cavitation-resistant valve core 7, a baffle 12, a pressure tapping pipe 6, a piston 15, a valve stem 11, an upper cover flange 5, and a rear cover 8. The upper cover flange 5 is connected to the valve body 1 by fastening screws 14, and the rear cover 8 is fixedly connected to the lower part of the valve body 1. One end of the cavitation-resistant valve core 7 is connected to the bottom of the valve stem 11, and the top of the valve stem 11 is connected to a spring assembly for controlling the movement of the cavitation-resistant valve core 7. The surface of the cavitation-resistant valve core 7 is provided with multiple annular pressure-reducing grooves 111. The annular pressure-reducing grooves 111 are distributed along the axial direction, and the groove cross-section is arc-shaped or stepped, which is used to realize the gradient decrease of fluid pressure and reduce fluid pressure step by step to reduce cavitation. The baffle 12 is fixed to the inner cavity of the valve body 1 and located on the valve core outlet side, and is used to block the fluid from directly impacting the piston 15; one end of the pressure tapping tube 6 is connected to the stable pressure zone on the outlet side of the valve body 1, and the other end is connected to the piston 15, and is used to guide the stable pressure to the piston to suppress oscillation.
[0017] The spring assembly includes an adjusting screw 9, an upper spring seat 2, an adjusting spring 3, and a lower spring seat 4. The top of the adjusting spring is connected to the upper spring seat 2, and the bottom is connected to the lower spring seat 4. The adjusting screw 9 abuts against the upper spring seat 2 and is used to adjust the compression of the adjusting spring 3. The piston has a screw mounting hole, in which a fixing screw 16 is installed. The top of the fixing screw 16 is connected to the lower spring seat 4, and the bottom is connected to the valve stem 11. The baffle 12 is fixed inside the valve body 1 by an inner retaining ring 13. The baffle 12 has a pressure-feeding pipe interface; the pressure-feeding pipe is a bent pipe structure that extends to near the valve body outlet to obtain stable pressure under laminar flow conditions.
[0018] The working process of this utility model is described below: 1. Initially, the user sets the desired outlet pressure by rotating the adjusting screw at the top. Turning it clockwise moves the adjusting screw downwards, compressing the adjusting spring. The spring force generates a downward force through the lower spring seat and ultimately acts on the piston. When there is no medium pressure or the pressure is insufficient, the piston moves downward under the action of the spring force, pushing the valve stem. The valve stem then overcomes the force of the return spring 17 located below the valve core, pressing open the valve core and opening the flow passage. The valve is in the open standby state.
[0019] 2. High-pressure media (gas or liquid) enters from the inlet end at the bottom of the valve body and flows through the open valve port. The special annular pressure-reducing groove on the cavitation-resistant valve core forces the media to change its flow path (such as flowing in a circular arc or arc shape), undergoing multiple expansions and contractions. This process decomposes a huge pressure drop into multiple small, gradient pressure drops.
[0020] After stabilizing for a certain distance, the flow state of the medium changes from turbulent to a more stable laminar flow. The inlet of the pressure tap is located in this stable pressure zone. The pressure tap guides the laminar flow from this stable pressure zone to the piston, pushing the piston upward. This, in turn, causes the valve stem to completely disengage the corrosion-resistant valve core. Under the action of the return spring and the force of the medium, the cavitation-resistant valve core is pressed tightly against the valve seat, achieving a sealed closure and cutting off the flow path.
[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A cavitation-resistant pressure reducing valve, characterized in that: It includes a valve body (1), a valve seat (10), a valve stem (11), a cavitation resistant valve core (7), a baffle (12), a pressure tap (6), and a piston (15); A valve cavity is formed inside the valve body (1); The valve seat (10) is fixedly installed in the lower part of the valve cavity; The cavitation resistant valve core (7) is disposed above the valve seat (10), and the lower part of the cavitation resistant valve core (7) is provided with a sealing surface that cooperates with the valve seat (10) to achieve sealing or opening; The lower end of the valve stem (11) is in contact with the upper part of the cavitation resistant valve core (7), and the upper end of the valve stem (11) is connected to the piston (15). The surface of the cavitation resistant valve core (7) is provided with multiple annular pressure-reducing grooves (111) to achieve a gradient decrease in fluid pressure; The baffle (12) is fixed inside the valve cavity to prevent fluid from directly impacting the piston (15); one end of the pressure tap (6) is connected to the stable pressure zone on the outlet side of the valve body (1), and the other end is connected to the piston (15) to guide the stable pressure to the piston to suppress oscillation.
2. The cavitation-resistant pressure reducing valve according to claim 1, characterized in that, The annular pressure-reducing grooves (111) of the cavitation-resistant valve core (7) are distributed along the axial direction, and the groove cross-section is arc-shaped or stepped, which is used to gradually reduce the fluid pressure to reduce cavitation.
3. The cavitation-resistant pressure reducing valve according to claim 1, characterized in that, The baffle (12) is fixed inside the valve body (1) by an inner retaining ring (13), and a pressure tapping pipe interface is provided on the baffle (12); The pressure tap (6) adopts a bent pipe structure.
4. The cavitation-resistant pressure reducing valve according to claim 1, characterized in that, It also includes an upper cover flange (5) and a rear cover (8), wherein the upper cover flange (5) is connected to the valve body (1) by fastening screws (14), and the rear cover (8) is connected to the lower part of the valve body (1).
5. The cavitation-resistant pressure reducing valve according to claim 1, characterized in that, It also includes a spring assembly, which includes an adjusting screw (9), an upper spring seat (2), an adjusting spring (3) and a lower spring seat (4). The top of the adjusting spring (3) is connected to the upper spring seat (2) and the bottom is connected to the lower spring seat (4). The adjusting screw (9) abuts against the upper spring seat (2).
6. A cavitation-resistant pressure reducing valve according to claim 5, characterized in that, The piston (15) is provided with a screw mounting hole, and a fixing screw (16) is installed in the screw mounting hole. The top of the fixing screw (16) is connected to the lower spring seat (4), and the bottom is connected to the valve stem (11).