Flow-controllable check valve
By using pressure relief device and piston mechanism in the check valve, the problem of valve disc damage caused by too fast fluid flow is solved, and the valve disc is protected and the function of preventing return is maintained.
Patent Information
- Application Number
- CN202420784950.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-16
AI Technical Summary
When the fluid flow rate is too fast, the existing check valve can easily cause the valve disc to be damaged, and thus lose the effect of preventing return.
A controllable flow check valve is designed, using a pressure relief device and a piston mechanism. When the liquid pressure is high, the piston moves below the water outlet, leaking some liquid, reducing the pressure of the liquid on the valve disc, thereby protecting the valve disc.
Some liquid is leaked through the pressure relief device, reducing the pressure on the valve disc, effectively protecting the valve disc, preventing damage, and maintaining the anti-return function of the check valve.
Smart Images
Figure CN222596799U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of check valves, in particular to a controllable flow check valve. Background Art
[0002] A check valve is also called a one-way valve or a reverse valve. Its function is to prevent the medium in the pipeline from flowing back. The opening and closing parts open or close automatically by the flow and force of the medium. The valve that prevents the medium from flowing back is called a check valve. The check valve belongs to the automatic valve category and is mainly used in pipelines where the medium flows in one direction. It only allows the medium to flow in one direction to prevent accidents.
[0003] In the prior art, the check valve can control the flow rate of the fluid by rotating the handle. However, the check valve in the prior art generally prevents the backflow of the fluid through the valve flap. However, when the fluid flow rate is too fast, the fluid pressure acting on the valve flap is large, which can easily cause the valve flap to be damaged, thereby causing the check valve to lose its function of preventing backflow, and has certain limitations. Utility Model Content
[0004] The purpose of the utility model is to provide a controllable flow check valve to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a controllable flow check valve, comprising a valve body and a pressure relief device, wherein connecting flanges are provided at both ends of the valve body, one end of the valve body is provided with a liquid outlet, and the other end of the valve body is provided with a liquid inlet, the liquid outlet and the liquid inlet are connected through an inner cavity, a sealing member is provided at the inner center of the valve body, a valve disc is provided above the sealing member, a valve stem is provided at the top center of the valve disc, the top end of the valve stem passes through the valve body and is located above the highest point of the valve body, the top of the valve stem is connected to a hand wheel, a pressure relief device is provided at the inner center bottom of the valve body, a piston is provided at the inner top of the pressure relief device, a piston rod is provided at the bottom center of the piston, the bottom of the piston rod is connected to the inner bottom of the pressure relief device, and a water outlet is provided on the surface of the pressure relief device.
[0006] Preferably, a first spring is sleeved on the surface of the valve stem, the bottom end of the first spring is connected to the top of the valve disc, and the top end of the first spring is connected to the highest point inside the valve body.
[0007] Preferably, a second spring is sleeved on the surface of the piston rod, the bottom end of the second spring is connected to the bottom of the pressure relief device, and the top end of the second spring is connected to the bottom of the piston.
[0008] Preferably, a cavity is formed on the surface of the piston, and a sealing ring is provided in the cavity.
[0009] Compared with the prior art, the beneficial effects of the utility model are:
[0010] The utility model discloses a controllable flow check valve. When the pressure of the liquid is relatively large, the piston will move to the lower part of the water outlet, and a part of the liquid will flow out of the water outlet. The utility model releases a part of the liquid through the pressure relief device, thereby reducing the pressure of the liquid on the bottom of the valve disc, thereby protecting the valve disc.
[0011] The utility model discloses a controllable flow check valve. When liquid flows out of the pressure relief device, the staff needs to slow down the flow rate of the fluid so that the force of the fluid acting on the bottom of the valve disc tends to be balanced. At this time, the piston will be rebounded to the initial position by the second spring, and the piston will be located above the water outlet. The surface of the piston is sealed by a sealing ring to prevent the liquid from flowing out from the gap between the piston and the valve body and then flowing out from the water outlet. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall cross-sectional view structure of the utility model;
[0013] Figure 2 for Figure 1 Enlarged view of point A in the middle.
[0014] In the figure: 1. valve body; 2. liquid outlet; 3. liquid inlet; 4. connecting flange; 5. valve disc; 6. first spring; 7. valve stem; 8. hand wheel; 9. pressure relief device; 10. water outlet; 11. piston; 12. sealing ring; 13. piston rod; 14. second spring. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0018] See also Figure 1-2 , the utility model provides a technical solution:
[0019] A controllable flow check valve comprises a valve body 1 and a pressure relief device 9. Connecting flanges 4 are provided at both ends of the valve body 1. A liquid outlet 2 is provided at one end of the valve body 1, and a liquid inlet 3 is provided at the other end of the valve body 1. The liquid outlet 2 and the liquid inlet 3 are communicated with each other through an inner cavity. A sealing member is provided at the inner center of the valve body 1, a valve flap 5 is provided above the sealing member, a valve stem 7 is provided at the top center of the valve flap 5, the top end of the valve stem 7 passes through the valve body 1 and is located above the highest point of the valve body 1, the top of the valve stem 7 is connected to a hand wheel 8, a pressure relief device 9 is provided at the inner center bottom of the valve body 1, a piston 11 is provided at the inner top of the pressure relief device 9, a piston rod 13 is provided at the bottom center of the piston 11, the bottom of the piston rod 13 is connected to the inner bottom of the pressure relief device 9, and a water outlet 10 is provided on the surface of the pressure relief device 9.
[0020] Furthermore, a first spring 6 is sleeved on the surface of the valve stem 7 , the bottom end of the first spring 6 is connected to the top of the valve disc 5 , and the top end of the first spring 6 is connected to the highest point inside the valve body 1 .
[0021] Furthermore, a second spring 14 is sleeved on the surface of the piston rod 13 , the bottom end of the second spring 14 is connected to the bottom of the pressure relief device 9 , and the top end of the second spring 14 is connected to the bottom of the piston 11 .
[0022] Furthermore, a cavity is formed on the surface of the piston 11, and a sealing ring 12 is provided in the cavity.
[0023] Working principle: Figure 1 As shown, a controllable flow check valve of the utility model can control the flow rate of liquid, which is mainly achieved by rotating the hand wheel 8. Rotating the hand wheel 8 will rotate the valve stem 7, and the rotation of the valve stem 7 will move the valve flap 5 upward. The upward movement of the valve flap 5 can control the opening size of the valve flap 5 under the action of fluid pressure. When the opening is large, the flow rate of the fluid is large, and vice versa.
[0024] It should be noted that the surface of the valve stem 7 is provided with an internal thread, and the connection between the valve stem 7 and the valve body 1 is provided with an external thread. The valve stem 7 will move by rotating the valve stem 7, and the movement of the valve stem 7 will move the valve flap 5.
[0025] like Figure 2 As shown, a controllable flow check valve of the utility model is provided with a pressure relief device 9 at the inner center bottom of the valve body 1. When the pressure of the liquid is relatively high, the piston 11 will move to the bottom of the water outlet 10, and a part of the liquid will flow out of the water outlet 10. The utility model releases a part of the liquid through the pressure relief device 9, thereby reducing the pressure of the liquid on the bottom of the valve disc 5, thereby protecting the valve disc 5.
[0026] like Figure 2 As shown, a controllable flow check valve of the utility model, when the pressure relief device 9 flows out of liquid, the staff needs to slow down the flow rate of the fluid, so that the force of the fluid acting on the bottom of the valve disc 5 tends to be balanced, and the piston will be rebounded to the initial position by the second spring 14, and then the piston 11 will be located above the water outlet, and the surface of the piston 11 is sealed by the sealing ring 12 to prevent the liquid from flowing out from the gap between the piston 11 and the valve body 1, and then flowing out from the water outlet 10.
[0027] Finally, it should be noted that the piston rod 13 and the piston 11 are prior art, and the internal structure and working principle of the piston rod 13 will not be described in detail here.
[0028] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A controllable flow check valve, comprising a valve body (1) and a pressure relief device (9), characterized in that: Both ends of the valve body (1) are provided with connecting flanges (4); one end of the valve body (1) is provided with a liquid outlet (2); the other end of the valve body (1) is provided with a liquid inlet (3); the liquid outlet (2) and the liquid inlet (3) are connected via an inner cavity; a sealing member is provided at the inner center of the valve body (1); a valve flap (5) is provided above the sealing member; a valve stem (7) is provided at the top center of the valve flap (5); the top end of the valve stem (7) passes through the valve body (1) and is ) and is located above the highest point of the valve body (1), the top of the valve stem (7) is connected to the hand wheel (8), a pressure relief device (9) is provided at the inner center bottom of the valve body (1), a piston (11) is provided at the inner top of the pressure relief device (9), a piston rod (13) is provided at the bottom center of the piston (11), the bottom of the piston rod (13) is connected to the inner bottom of the pressure relief device (9), and a water outlet (10) is provided on the surface of the pressure relief device (9).
2. A controllable flow check valve according to claim 1, characterized in that: A first spring (6) is sleeved on the surface of the valve stem (7), the bottom end of the first spring (6) is connected to the top of the valve flap (5), and the top end of the first spring (6) is connected to the highest point inside the valve body (1).
3. A controllable flow check valve according to claim 1, characterized in that: A second spring (14) is sleeved on the surface of the piston rod (13), the bottom end of the second spring (14) is connected to the bottom of the pressure relief device (9), and the top end of the second spring (14) is connected to the bottom of the piston (11).
4. A controllable flow check valve according to claim 1, characterized in that: A cavity is formed on the surface of the piston (11), and a sealing ring (12) is arranged in the cavity.