Piston pressure reducing valve
By using a two-stage spring structure design for the piston pressure reducing valve, the problems of high manufacturing difficulty and difficulty in guaranteeing the lifespan of the spring structure in existing pressure reducing valves are solved, thus achieving stability of mechanical performance and extension of service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-03-13
AI Technical Summary
In existing water system pressure reducing valves, the spring structure is difficult to manufacture, its quality and lifespan are not easily guaranteed, and its mechanical properties such as stiffness decrease after long-term use.
It adopts a two-stage spring structure. By adjusting the bolt to press down the main spring and the valve stem to press down the secondary spring, the piston transmits pressure reduction, reduces the force on each spring, and prolongs the durability of mechanical performance.
This improves the mechanical performance stability of the pressure reducing valve, extends its service life, and reduces fatigue wear on the spring structure.
Smart Images
Figure CN223991992U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a piston pressure reducing valve. Background Technology
[0002] Currently, the pressure reducing valves used in water systems are generally spring-based structures. Springs not only require materials with high fatigue limits, yield points, sufficient impact toughness, excellent hardenability, low overheat sensitivity, and resistance to decarburization, but also require good heat treatment processes. Therefore, the manufacture of springs is quite difficult, and their quality and lifespan are not easily guaranteed. When springs are subjected to alternating stress for a long time, their stiffness and other mechanical properties will inevitably decrease until they are finally scrapped and replaced. Summary of the Invention
[0003] The purpose of this invention is to provide a piston pressure reducing valve.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] A piston pressure reducing valve, characterized in that it comprises a valve cover, a valve body, and a bottom cover fixedly connected vertically. An adjusting nut is fixedly provided at the upper end of the valve cover, and an adjusting bolt is screwed into the adjusting nut vertically. A main spring is provided inside the valve cover, and a spring seat is fixedly provided at the upper end of the main spring. The lower end of the adjusting bolt engages with the upper end of the spring seat. A piston is connected to the lower end of the main spring. A piston cylinder is fixedly provided at the upper end of the valve body, and the piston cylinder guides the piston to move up and down. A valve stem is provided vertically at the center of the valve body, and the upper end of the valve stem is limited by the lower end of the piston. A valve seat is fixedly sleeved on the outer side of the valve stem. The lower end of the valve seat is elastically connected to the upper end of the bottom cover via a secondary spring. A retaining ring protrudes from the inner cavity of the valve body, and the retaining ring limits the upper end of the valve seat. An inlet pipe and an outlet pipe are respectively provided on both sides of the valve body. The inlet pipe communicates with the cavity above the retaining ring of the valve body, and the outlet pipe communicates with the cavity below the retaining ring of the valve body.
[0006] Furthermore, a valve hole is provided in the center of the bottom cover, and the valve stem is guided to move up and down through the valve hole.
[0007] Furthermore, the inlet pipe is inclined upward from the outside to the inside, and the outlet pipe is inclined downward from the outside to the inside.
[0008] Furthermore, a piston nut is fixedly provided at the upper end of the piston, and the upper end of the valve stem is threadedly connected to the piston nut.
[0009] Furthermore, a valve seat nut is fixedly provided at the lower end of the valve seat, and the lower part of the valve stem is threadedly connected to the valve seat nut.
[0010] This invention features a two-stage spring system. The main spring is pressed down by an adjusting bolt, which in turn presses down the auxiliary spring by the valve stem and valve seat. The pressure reduction between the two stages of springs is transmitted through a piston, resulting in a smaller pressure on each spring and ensuring that the mechanical properties of the springs are durable and do not easily deteriorate. Attached Figure Description
[0011] Figure 1 This is a side sectional view of the present invention;
[0012] Figure 2 This is a diagram of the external structure of this utility model.
[0013] Figure label:
[0014] 1. Bottom cover, 2. First O-ring, 3. Valve body, 4. Secondary spring, 5. Valve stem
[0015] 6. Valve seat, 7. Piston cylinder, 8. Piston, 9. Valve cover, 10. Main spring.
[0016] 11 Spring seat, 12 Adjusting bolt, 13 Adjusting nut, 14 Piston nut, 15 Second O-ring,
[0017] 16 Third O-ring, 17 Fourth O-ring, 18 Fifth O-ring, 19 Valve seat nut, 20 Retaining ring. Detailed Implementation
[0018] 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.
[0019] This embodiment discloses a piston pressure reducing valve, such as Figure 1 and Figure 2 As shown, the valve includes a valve cover 9, a valve body 3, and a bottom cover 1, which are fixedly connected in sequence. An adjusting nut 13 is fixedly provided on the upper end of the valve cover 9. The adjusting nut 13 is screwed into the adjusting bolt 12 vertically. A main spring 10 is provided inside the valve cover 9. A spring seat 11 is fixedly provided on the upper end of the main spring 10. The lower end of the adjusting bolt 12 is engaged with the upper end of the spring seat 11.
[0020] The lower end of the main spring 10 is connected to the piston 8, and the upper end of the valve body 3 is fixedly provided with the piston cylinder 7. The piston cylinder 7 guides the piston 8 to rise and fall. The upper end of the piston 8 is provided with an annular stop block, and the piston cylinder 7 is provided with an annular step that cooperates with the annular stop block to stop.
[0021] A valve stem 5 is vertically arranged in the center of the valve body 3. The upper end of the valve stem 5 is limited by the lower end of the piston 8. A piston nut 14 is fixedly arranged at the upper end of the piston 8. The upper end of the valve stem 5 is threadedly connected to the piston nut 14.
[0022] like Figure 1 As shown, a valve hole is provided in the center of the bottom cover 1. The valve stem 5 is guided to rise and fall by the valve hole. The valve seat 6 is fixedly sleeved on the outside of the valve stem 5. A valve seat nut 19 is fixedly provided at the lower end of the valve seat 6. The lower part of the valve stem 5 is threadedly connected to the valve seat nut 19. The lower end of the valve seat 6 is elastically connected to the upper end of the bottom cover 1 by a secondary spring 4.
[0023] like Figure 1 As shown, a retaining ring 20 protrudes from the inner cavity of the valve body 3, and the retaining ring 20 limits the upper end of the valve seat 6, as shown. Figure 1 As shown, the valve body 3 has an inlet pipe and an outlet pipe on both sides. The inlet pipe is connected to the cavity above the retaining ring 20 of the valve body 3, and the outlet pipe is connected to the cavity below the retaining ring 20 of the valve body 3. The inlet pipe is inclined upward from the outside to the inside, and the outlet pipe is inclined downward from the outside to the inside.
[0024] The valve body 3 and the bottom cover 1 are sealed by the first O-ring 2, the piston 8 and the piston cylinder 7 are sealed by the second O-ring 15, the part of the piston cylinder 7 above the annular stop and the valve body 3 are sealed by the third O-ring 16, the lower part of the piston 8 and the piston cylinder 7 are sealed by the fourth O-ring 17, and the part of the piston cylinder 7 below the annular stop and the valve body 3 are sealed by the fifth O-ring 18.
[0025] Initially, the main spring 10 and the secondary spring 4 are in a free state, as follows: Figure 1 As shown, fluid enters the cavity above the retaining ring 20 from the inlet pipe on the left side of the valve body 3. At this time, the auxiliary spring 4 pushes up the valve seat 6, and the upper end of the valve seat 6 is tightly fitted with the lower end of the retaining ring 20. The cavity above the retaining ring 20 and the cavity below the retaining ring 20 are cut off, sealing the outlet pipe of the valve body 3.
[0026] During operation, the operator rotates the adjusting bolt 12 to press the main spring 10 downward. The main spring 10 pushes the piston 8 downward, and the piston 8 and valve stem 5 move downward. The valve seat 6 moves downward simultaneously and disengages from the retaining ring 20. The cavity above the retaining ring 20 and the cavity below the retaining ring 20 are connected, and the outlet pipe on the right side of the valve body 3 is opened, allowing fluid to flow out from the outlet pipe.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A piston pressure reducing valve, characterized by, The utility model provides a valve, including upper and lower fixed connection of valve cover (9), valve body (3) and bottom cover (1) in proper order, the upper end of valve cover (9) is equipped with adjusting nut (13) fixedly, adjusting nut (13) is twisted into adjusting bolt (12) along the vertical, the inside of valve cover (9) is equipped with main spring (10), the upper end of main spring (10) is equipped with spring seat (11) fixedly, the lower end of adjusting bolt (12) is cooperated with the upper end of spring seat (11), the lower end of main spring (10) is connected with piston (8), the upper end of valve body (3) is equipped with piston cylinder (7) fixedly, piston cylinder (7) guides piston (8) to go up and down, the central of valve body (3) is equipped with valve rod (5) along the vertical, the upper end of valve rod (5) is limited by the lower end of piston (8), the outside of valve rod (5) is fixedly sleeved with valve seat (6), the lower end of valve seat (6) is elastically connected with the upper end of bottom cover (1) through auxiliary spring (4), the inner cavity of valve body (3) is projected with baffle ring (20), the upper end of valve seat (6) is limited by baffle ring (20), the both sides of valve body (3) are equipped with inlet pipeline and outlet pipeline respectively, the inlet pipeline is communicated with the cavity above baffle ring (20) of valve body (3), the outlet pipeline is communicated with the cavity below baffle ring (20) of valve body (3).
2. The piston pressure reducing valve according to claim 1, characterized in that The central of bottom cover (1) is equipped with valve hole, and the valve rod (5) is guided to go up and down by valve hole.
3. The piston pressure reducing valve according to claim 1, characterized in that The inlet pipeline is arranged to be inclined upward from the outside to the inside, and the outlet pipeline is arranged to be inclined downward from the outside to the inside.
4. The piston pressure reducing valve according to claim 1, characterized in that The upper end of piston (8) is fixedly equipped with piston nut (14), and the upper end of valve rod (5) is threadedly connected with piston nut (14).
5. The piston pressure reducing valve according to claim 1, characterized in that The lower end of valve seat (6) is fixedly equipped with valve seat nut (19), and the lower part of valve rod (5) is threadedly connected with valve seat nut (19).