Piston type pressure reducing valve

Abstract

An adjusting nut is fixedly arranged at the upper end of a valve cover, the adjusting nut is screwed into an adjusting bolt in the vertical direction, a main spring is installed in the valve cover, the upper end of the main spring is connected with the lower end of the adjusting bolt through a spring seat, the lower end of the main spring is connected with a piston, a piston cylinder is fixed at the upper end of a valve body, and the piston cylinder guides the piston to ascend and descend. A valve rod is arranged in the center of the valve body, the upper end of the valve rod is limited by the lower end of a piston, the valve rod is fixedly sleeved with a valve seat, the lower end of the valve seat is elastically connected with a bottom cover through an auxiliary spring, a check ring is arranged in an inner cavity of the valve body in a protruding mode and limits the upper end of the valve seat, and an inlet pipeline and an outlet pipeline are arranged on the two sides of the valve body respectively. The inlet pipeline is communicated with a cavity below the valve body check ring, and the outlet pipeline is communicated with a cavity above the valve body check ring; the pressure reducing valve can enable fluid to enter from a low position and exit from a high position, the two springs above and below the piston reduce pressure, the pressure stabilizing precision is improved, pressure is transmitted between the two-stage springs through the piston, pressure borne by each spring is small, and the mechanical performance of the springs is durable and not prone to decline.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a piston-type pressure reducing valve. Background Technology

[0002] Piston-type pressure reducing valves regulate the flow of the medium by controlling the opening degree of the opening and closing parts within the valve body, thereby reducing the pressure of the medium. At the same time, they adjust the opening degree of the opening and closing parts by using the pressure downstream of the valve to keep the downstream pressure within a certain range. Even when the inlet pressure is constantly changing, the outlet pressure is kept within the set range, thus protecting downstream household and production equipment.

[0003] Existing piston-type pressure reducing valves typically have a piston cylinder perpendicular to the valve body in the middle, with a piston rod inside the piston cylinder and an adjusting spring fitted on the piston rod. In this design, the fluid usually enters at a high pressure and exits at a low pressure, resulting in low outlet pressure stability when the inlet pressure changes. Summary of the Invention

[0004] The purpose of this invention is to provide a piston-type pressure reducing valve.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A piston-type pressure reducing valve is characterized by comprising a valve cover, a valve body, and a bottom cover fixedly connected sequentially. 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 installed inside the valve cover, and the upper end of the main spring is connected to the lower end of the adjusting bolt via a spring seat. The main spring is controlled to extend and retract by the adjusting bolt. 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 rise and fall. A valve stem is vertically provided 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, and the lower end of the valve seat is elastically connected to the bottom cover via a secondary spring. A retaining ring protrudes from the inner cavity of the valve body, limiting 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 below the retaining ring of the valve body. The inlet pipe extends horizontally inward and then inclined downward. The outlet pipe communicates horizontally with the cavity above the retaining ring of the valve body.

[0007] 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.

[0008] Furthermore, the upper part of the valve seat has a radially protruding retaining ring, the outer diameter of which is larger than the inner diameter of the retaining ring, and the outer diameter of which is larger than the inner diameter of the valve hole.

[0009] Furthermore, a protective cover is fitted onto the upper end of the valve cover, and the adjusting bolt is located inside the protective cover.

[0010] This utility model pressure reducing valve allows fluid to enter from a low pressure and exit from a high pressure. The pressure is reduced by two springs above and below the piston, improving the pressure stabilization accuracy. The pressure reduction is transmitted between the two springs through the piston. Each spring experiences less pressure, and 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 seat

[0015] 6. Valve stem, 7. Piston cylinder, 8. Piston, 9. Valve cover, 10. Main spring.

[0016] 11 Spring seat, 12 Adjusting bolt, 13 Adjusting nut, 14 Protective cover, 15 Double-ended stud.

[0017] 16 Locking nut, 17 Second O-ring, 18 Third O-ring, 19 Fourth O-ring,

[0018] 20. Retaining ring, 21. Retaining ring, 22. Valve hole. Detailed Implementation

[0019] 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.

[0020] This embodiment discloses a piston-type pressure reducing valve, such as Figure 2 As shown, it includes a valve cover 9, a valve body 5, and a bottom cover 1 that are fixedly connected in sequence. The valve cover 9 and the valve body 5 are fixedly connected by a double-ended stud 15 and a locking nut 16.

[0021] like Figure 1 As shown, 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 in a vertical direction. A main spring 10 is installed inside the valve cover 9. The upper end of the main spring 10 is connected to the lower end of the adjusting bolt 12 through a spring seat 11. The extension and retraction of the main spring 10 is controlled by the adjusting bolt 12.

[0022] When the pressure reducing valve in this embodiment is not in use, the upper end of the valve cover 9 is fitted with a protective cover 14, and the adjusting bolt 12 is placed inside the protective cover 14.

[0023] 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 a piston cylinder 7. The piston cylinder 7 guides the piston 8 to rise and fall, and the lower part of the piston cylinder 7 is provided with an annular step at the lower end of the stop piston 8.

[0024] like Figure 1 As shown, a valve stem 6 is vertically arranged in the center of the valve body 3. The upper end of the valve stem 6 is limited by the lower end of the piston 8. A valve seat 5 is fixedly sleeved on the outer side of the valve stem 6. The lower end of the valve seat 5 is elastically connected to the bottom cover 1 through a secondary spring 4. A retaining ring 20 protrudes from the inner cavity of the valve body 3. The retaining ring 20 limits the upper end of the valve seat 5. An inlet pipe and an outlet pipe are respectively arranged on both sides of the valve body 3. The inlet pipe is connected to the cavity below the retaining ring 20 of the valve body 3, and the outlet pipe is connected to the cavity above the retaining ring 20 of the valve body 3.

[0025] like Figure 1 As shown, the bottom cover 1 has a valve hole 22 in the center, the valve stem 6 is guided to rise and fall by the valve hole 22, and the upper part of the valve seat 5 has a retaining ring 21 protruding radially. The outer diameter of the retaining ring 21 is larger than the inner diameter of the retaining ring 20 and the outer diameter of the retaining ring 21 is larger than the inner diameter of the valve hole 22. When the valve seat 5 moves upward, the retaining ring 21 is limited by the retaining ring 20. When the valve seat 5 moves downward, the retaining ring 21 is limited by the valve hole 22.

[0026] like Figure 1 As shown, the valve body 3 and the bottom cover 1 are sealed by the first O-ring 2, the piston 8 and the upper part of the piston cylinder 7 are sealed by the second O-ring 17, the lower part of the piston cylinder 7 and the upper part of the valve body 3 are sealed by the third O-ring 18, and the valve seat 5 and the valve hole 22 are sealed by the fourth O-ring 19.

[0027] Initially, the main spring 10 and the secondary spring 4 are in a free state, as follows: Figure 1 As shown, the fluid enters the cavity below the retaining ring 20 inside the valve body 3 through the inlet pipe on the left side of the valve body 3, first horizontally to the left and then tilted downwards to the left. At this time, the auxiliary spring 4 pushes up the valve seat 5, and the retaining ring 21 of the valve seat 5 fits tightly with 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 on the right side of the valve body 3.

[0028] 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 6 move downward. The retaining ring 21 moves downward synchronously 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 horizontally to the right from the outlet pipe.

[0029] 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 type pressure reducing valve characterized by comprising: The utility model relates to a valve, including upper and lower fixed connection of valve cover (9), valve body (5) and bottom cover (1) in proper order, the upper end of valve cover (9) is fixed with adjusting nut (13), adjusting nut (13) is twisted into adjusting bolt (12) along the vertical, the main spring (10) is installed in valve cover (9), the upper end of main spring (10) is connected with the lower end of adjusting bolt (12) through spring seat (11), and main spring (10) is controlled telescopic by adjusting bolt (12), and the lower end of main spring (10) is connected with piston (8), the upper end of valve body (3) is fixed with piston cylinder (7), and piston cylinder (7) guides piston (8) to go up and down, the central vertical of valve body (3) is equipped with valve stem (6), and the upper end of valve stem (6) is limited by the lower end of piston (8), and the outer side of valve stem (6) is fixed with valve seat (5), and the lower end of valve seat (5) is elastically connected with bottom cover (1) through auxiliary spring (4), and the inner cavity of valve body (3) is projected with baffle ring (20), and the upper end of valve seat (5) is limited by baffle ring (20), and the both sides of valve body (3) are equipped with inlet pipeline and outlet pipeline respectively, the cavity below baffle ring (20) of inlet pipeline and valve body (3) is communicated, and the inlet pipeline is set up first horizontally inwards and then extends downwardly and obliquely, and the outlet pipeline is communicated with the cavity above baffle ring (20) of valve body (3) along the horizontal direction.

2. The piston pressure reducing valve according to claim 1, characterized in that The central of bottom cover (1) is equipped with valve hole (22), and valve stem (6) is guided to go up and down by valve hole (22).

3. The piston pressure reducing valve according to claim 2, wherein The upper portion of valve seat (5) is projected with baffle ring (21) along the radial direction, the outer diameter of baffle ring (21) is greater than the inner diameter of baffle ring (20), and the outer diameter of baffle ring (21) is greater than the inner diameter of valve hole (22).

4. The piston pressure reducing valve according to claim 1, wherein The upper end of valve cover (9) is sleeved with protective cover (14), and adjusting bolt (12) is located in protective cover (14).

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