Pressure reducing valve

Abstract

The utility model provides a pressure reducing valve, and belongs to the technical field of valve manufacturing. The problem that an existing pressure reducing valve is high in cost is solved. The pressure reducing valve comprises a valve body provided with a water inlet and a water outlet, a valve seat is arranged in the valve body, a valve element vertically penetrating through the valve seat is arranged in the valve body, the upper end, penetrating out of the valve seat, of the valve element is fixedly connected with a diaphragm, the valve body is in threaded connection with a valve deck pressing the periphery of the diaphragm, and a pressure adjusting structure is arranged between the valve deck and the diaphragm. A water storage cavity communicated with the water outlet is formed between the diaphragm and the valve seat, a sealing ring sealed on the valve rod is embedded in the inner wall of the top of the valve seat, and a circle of step which is concave in the radial direction and extends to the top face is arranged on the outer wall of the top of the valve seat. The utility model has the advantages of compact structure, low manufacturing cost, good use effect and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve manufacturing technical field, and particularly relates to a pressure reducing valve. BACKGROUND

[0002] In order to the pressure control of fluid in the pipe connection, usually installs pressure reducing valve in the corresponding position of pipe, and pressure reducing valve is balanced with spring force through the adjustment of itself, so that the pressure after valve keeps constant in certain error range.

[0003] For example, the Chinese patent document discloses a kind of pressure reducing valve [application number: 202222262850.1;Grant announcement number: CN218377874U], it includes valve body assembly, valve body assembly has a water inlet and a water outlet, valve body assembly is formed with a valve cavity, water inlet and water outlet are communicated with valve cavity and are arranged;Piston, piston is movably arranged in valve cavity;Valve clack, valve clack is arranged in the lower end of piston;Adjusting spring, the upper end of adjusting spring is connected with the upper end of valve cavity, the lower end of adjusting spring is connected with the upper end of piston;Communication structure, communication structure is used to connect water inlet and water outlet, the lower end of communication structure is formed with a mouth, valve clack can be operated to open or close mouth setting, the lower end of communication structure is formed with a annular protruding portion, the outer edge of the upper end of valve clack can be operated to be arranged with annular protruding portion.

[0004] The pressure stability of the above-mentioned pressure reducing valve is good, but the piston is embedded with a sealing ring, in order to ensure the axial sealing length, the axial length of the communication structure must be increased, the upper part of the piston is radially convex, which consumes more materials and has high manufacturing cost, and the communication port between the upper part of the piston and the water outlet is not large, the pressure feedback is not timely enough, which affects the use effect. SUMMARY

[0005] The utility model aims at the above-mentioned problems existing in prior art, provide a kind of compact structure, low manufacturing cost and good pressure reducing valve of use effect.

[0006] The utility model discloses a pressure reducing valve, including the valve body with water inlet and water outlet, the valve body has the valve seat that separates water inlet and water outlet with having, the valve seat has the water inlet cavity that is communicated with water inlet, the bottom of valve seat has the water -passing hole that vertically penetrates, and the water outlet cavity that is equipped between the bottom of valve seat and valve body is communicated with water outlet, the valve body is equipped with the valve core that vertically passes through the valve seat, and the lower end of valve core passes through water -passing hole and is fixedly connected with the water stop piece, its characterized in that, the upper end of valve core that penetrates valve seat is fixedly connected with the diaphragm, the valve cover that is communicated with the periphery of diaphragm is pressed tightly is screwed on the valve body, the pressure regulating structure is equipped between the valve cover and diaphragm, the water storage cavity that is communicated with water outlet is between the diaphragm and valve seat, the inner wall of the top of valve seat is embedded with the sealing ring that is sealed to valve rod, and the outer wall of the top of valve seat has a circle radial recess and extends to the step of top surface, and the interval between the outer wall of valve seat towards water outlet and the inner wall of water storage cavity at water outlet is 0.38-0.45 times of water outlet inner diameter, and the interval between the step surface towards water outlet and the inner wall of water storage cavity at water outlet is 0.52-0.6 times of water outlet inner diameter.

[0007] In the above-mentioned pressure reducing valve, the pressure regulating structure includes an adjusting spring in the valve cover, a top of the valve cover is screwed with an adjusting rod, the adjusting rod extends into the valve cover, and an adjusting seat is arranged between a lower end of the adjusting rod and the adjusting spring, an upper end of the valve core extending out of the diaphragm is sleeved with a spring seat, and a nut is screwed on the valve core to lock the spring seat, the valve core has a shoulder which is supported on a bottom of the diaphragm and protrudes radially outward, an upper end of the adjusting spring abuts against the adjusting seat, and a lower end of the adjusting spring abuts against the spring seat.

[0008] In the above-mentioned pressure reducing valve, the adjusting rod is screwed with an adjusting nut at an upper end of the valve cover.

[0009] In the above-mentioned pressure reducing valve, a lower end of the valve core is screwed with a supporting plate, and the water stop piece is embedded in the supporting plate, the valve core is sleeved with a baffle which is pressed on a top surface of the water stop piece, and the bottom of the valve seat has a ring of protrusions which protrude axially and are sealed by the water stop piece.

[0010] In the above-mentioned pressure reducing valve, the bottom of the valve seat is screwed with a locking cap, and a return spring is arranged between the locking cap and the supporting plate.

[0011] In the above-mentioned pressure reducing valve, the valve body is provided with a pressure measuring hole which is communicated with the water outlet, the pressure measuring hole is screwed with a plug cap, and a gasket is arranged between the plug cap and the pressure measuring hole.

[0012] Compared with the prior art, the pressure reducing valve has good sealing performance, consumes less materials, has low manufacturing cost, and has timely pressure feedback and good use effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the structure of this pressure reducing valve.

[0014] In the diagram, 1. Inlet; 2. Outlet; 3. Valve body; 4. Valve seat; 5. Inlet chamber; 6. Water passage hole; 7. Outlet chamber; 8. Valve core; 9. Water stop plate; 10. Diaphragm; 11. Valve cover; 12. Water storage chamber; 13. Sealing ring; 14. Step; 15. Adjusting spring; 16. Adjusting rod; 17. Adjusting seat; 18. Spring seat; 19. Nut; 20. Shoulder; 21. Adjusting nut; 22. Support plate; 23. Baffle; 24. Protruding ring; 25. Locking cap; 26. Return spring; 27. Pressure test hole; 28. Plug cap; 29. ​​Washer. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 As shown, this pressure reducing valve includes a valve body 3 with an inlet 1 and an outlet 2. The valve body 3 contains a valve seat 4 that separates the inlet 1 and outlet 2. The valve seat 4 has an inlet chamber 5 connected to the inlet 1. The bottom of the valve seat 4 has a vertically penetrating water passage 6. An outlet chamber 7 is provided between the bottom of the valve seat 4 and the valve body 3, and the outlet chamber 7 is connected to the outlet 2. A valve core 8 is provided in the valve body 3, vertically penetrating the valve seat 4. The lower end of the valve core 8 passes through the water passage 6 and is fixedly connected to a water-stopping plate 9. The upper end of the valve core 8 protrudes from the valve seat 4 and is fixedly connected to a diaphragm 10. A valve cover 11, which presses the periphery of the diaphragm 10, is threadedly connected to the valve body 3. A pressure regulating structure is provided between the valve cover 11 and the diaphragm 10. A water storage cavity 12 communicating with the outlet 2 is provided between the diaphragm 10 and the valve seat 4. A sealing ring 13 sealing the valve stem is embedded in the inner wall of the top of the valve seat 4. The outer wall of the top of the valve seat 4 has a radially recessed step 14 extending to the top surface. The distance between the outer wall of the valve seat 4 facing the outlet 2 and the inner wall of the water storage cavity 12 at the outlet 2 is 0.38-0.45 times the inner diameter of the outlet 2. The distance between the step 14 facing the outlet 2 and the inner wall of the water storage cavity 12 at the outlet 2 is 0.52-0.6 times the inner diameter of the outlet 2. In this embodiment, the distance between the outer wall of the valve seat 4 facing the outlet 2 and the inner wall of the water storage cavity 12 at the outlet 2 is 0.4 times the inner diameter of the outlet 2, and the distance between the step 14 facing the outlet 2 and the inner wall of the water storage cavity 12 at the outlet 2 is 0.55 times the inner diameter of the outlet 2.

[0017] The sealing ring 13 is embedded in the inner wall of the valve seat 4, which ensures the sealing between the valve core 8 and the valve seat 4, and also makes the axial length of the valve seat 4 not too long, reduces the consumption of materials, and the setting of the diaphragm 10 also reduces the consumption of materials of the valve core 8, and reduces the manufacturing cost; in addition, the spacing between the valve seat 4, the step 14 and the water outlet 2 is set, so that the connecting aperture between the water storage cavity 12 and the water outlet 2 is large, the pressure feedback is timely, and the use effect is good.

[0018] Before using the pressure reducing valve, the elastic force of the pressure regulating structure is set, the valve core 8 is moved downward, and the gap between the water stop piece 9 and the bottom of the valve seat 4 is formed; when the pressure of the water outlet 2 increases, the water storage cavity 12 feeds back in time, the internal pressure increases, and the diaphragm 10 is pushed to overcome the elastic force of the pressure regulating structure, so that the valve core 8 moves upward, the gap between the water stop piece 9 and the bottom of the valve seat 4 is reduced, thereby reducing the flow of the water outlet 2, reducing the pressure of the water outlet 2, and until the pressure of the water outlet 2 reaches the set value; when the pressure of the water outlet 2 decreases, the internal pressure of the water storage cavity 12 decreases, the elastic force of the pressure regulating structure pushes the diaphragm 10, drives the valve core 8 to move downward, increases the gap between the water stop piece 9 and the bottom of the valve seat 4, thereby increasing the flow of the water outlet 2, increasing the pressure of the water outlet 2, and until the pressure of the water outlet 2 reaches the set value, so that the pressure of the water outlet 2 is kept constant within a certain error.

[0019] The pressure regulating structure includes an adjusting spring 15 located in the valve cover 11, the top of the valve cover 11 is threadedly connected with an adjusting rod 16, the adjusting rod 16 extends into the adjusting seat 17 between the lower end of the valve cover 11 and the adjusting spring 15, the upper end of the valve core 8 extending out of the diaphragm 10 is sleeved with a spring seat 18, and the end of the valve core 8 is threadedly connected with a nut 19 for locking the spring seat 18, the valve core 8 has a shoulder 20 which is supported on the bottom of the diaphragm 10 and radially outwardly protrudes, the upper end of the adjusting spring 15 abuts against the adjusting seat 17, and the lower end of the adjusting spring 15 abuts against the spring seat 18. By rotating the adjusting rod 16, the compression amount of the adjusting spring 15 is changed, that is, the elastic force of the adjusting spring 15 is adjusted, the pressure regulating is convenient, the adjusting seat 17 and the spring seat 18 are arranged, so that the adjusting spring 15 is limited, and the working stability is good.

[0020] The upper end of the adjusting rod 16 threadedly extending out of the valve cover 11 is threadedly connected with an adjusting nut 21. After the adjustment of the adjusting rod 16 is completed, the adjusting nut 21 is locked on the valve cover 11, so that the adjusting rod 16 is prevented from loosening, and the working stability is good.

[0021] The lower end of the valve core 8 is threadedly connected with a supporting plate 22, the water stop piece 9 is embedded in the supporting plate 22, the valve core 8 is sleeved with a baffle 23 which presses on the top surface of the water stop piece 9, and the bottom of the valve seat 4 has a ring of axially protruding and sealing the water stop piece 9. In this way, the water stop piece 9 is convenient to install, the sealing effect of the protruding ring 24 and the water stop piece 9 is good, and the supporting plate 22 prevents the water stop piece 9 from expanding outwardly due to deformation, thereby ensuring the sealing effect.

[0022] The bottom of the valve seat 4 is screwed with a locking cap 25, and a reset spring 26 is arranged between the locking cap 25 and the supporting plate 22. The reset spring 26 provides elastic force to make the water stopper 9 keep sealing to the valve seat 4, and ensure the sealing when not in use; when in use, the elastic force of the adjusting spring 15 is equal to the elastic force of the reset spring 26 and the pressure of the water storage cavity 12, so that they jointly play the role of constant pressure of the water outlet 2.

[0023] The valve body 3 is provided with a pressure measuring hole 27 communicated with the water outlet 2, the pressure measuring hole 27 is screwed with a plug cap 28, and a gasket 29 is arranged between the plug cap 28 and the pressure measuring hole 27. The gasket 29 ensures the sealing, and the arrangement of the pressure measuring hole 27 facilitates the installation of a pressure gauge, which can conveniently detect the pressure of the water outlet 2, and is convenient to use.

[0024] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. The specific embodiments described in the specification are only illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

Claims

1. A pressure reducing valve comprising a valve body (3) having a water inlet (1) and a water outlet (2), a valve seat (4) separating the water inlet (1) and the water outlet (2) in the valve body (3), the valve seat (4) having a water inlet cavity (5) communicating with the water inlet (1), the bottom of the valve seat (4) having a vertical water passage hole (6), a water outlet cavity (7) being provided between the bottom of the valve seat (4) and the valve body (3) and communicating with the water outlet (2), a valve core (8) being provided in the valve body (3) vertically through the valve seat (4), the lower end of the valve core (8) penetrating through the water passage hole (6) and being fixed with a water stop piece (9), characterized in that, The valve core (8) penetrates the upper end of the valve seat (4) and is fixedly connected with a diaphragm (10), the valve body (3) is threadedly connected with a valve cover (11) for pressing the periphery of the diaphragm (10), a pressure regulating structure is arranged between the valve cover (11) and the diaphragm (10), the diaphragm (10) and the valve seat (4) have a water storage cavity (12) communicated with the water outlet (2), the inner wall of the top of the valve seat (4) is embedded with a sealing ring (13) sealed with the valve rod, the outer wall of the top of the valve seat (4) has a step (14) radially recessed and extending to the top surface, the distance between the outer wall of the valve seat (4) towards the water outlet (2) and the inner wall of the water storage cavity (12) at the water outlet (2) is 0.38-0.45 times the inner diameter of the water outlet (2), and the distance between the step (14) surface of the valve seat (4) towards the water outlet (2) and the inner wall of the water storage cavity (12) at the water outlet (2) is 0.52-0.6 times the inner diameter of the water outlet (2).

2. A pressure reducing valve according to claim 1, wherein The pressure regulating structure comprises an adjusting spring (15) arranged in the valve cover (11), the top of the valve cover (11) is threadedly connected with an adjusting rod (16), the adjusting rod (16) extends into the valve cover (11) and is provided with an adjusting seat (17) between the lower end of the valve cover (11) and the adjusting spring (15), the upper end of the valve core (8) penetrating the diaphragm (10) is sleeved with a spring seat (18), and the upper end of the valve core (8) is threadedly connected with a nut (19) for locking the spring seat (18), the valve core (8) has a shoulder (20) radially outwardly protruding and supported on the bottom of the diaphragm (10), the upper end of the adjusting spring (15) abuts against the adjusting seat (17), and the lower end of the adjusting spring (15) abuts against the spring seat (18).

3. A pressure reducing valve according to claim 2, wherein The adjusting rod (16) is threadedly connected with an adjusting nut (21) extending out of the upper end of the valve cover (11).

4. A pressure reducing valve according to claim 3, wherein The lower end of the valve core (8) is threadedly connected with a supporting plate (22), a water stop piece (9) is embedded in the supporting plate (22), the valve core (8) is sleeved with a baffle (23) pressed on the top surface of the water stop piece (9), and the bottom of the valve seat (4) has a protruding ring (24) axially protruding and sealed by the water stop piece (9).

5. A pressure reducing valve according to claim 4, wherein The bottom of the valve seat (4) is threadedly connected with a locking cap (25), and a return spring (26) is arranged between the locking cap (25) and the supporting plate (22).

6. A pressure reducing valve according to claim 5, wherein The valve body (3) is provided with a pressure measuring hole (27) communicated with the water outlet (2), the pressure measuring hole (27) is threadedly connected with a plug cap (28), and a gasket (29) is arranged between the plug cap (28) and the pressure measuring hole (27).

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