Low-resistance pipeline check valve

Abstract

The utility model relates to the technical field of check valves, and discloses a low-resistance pipeline check valve, which comprises a check valve body and a valve cover detachably connected with the check valve body, a water inlet channel and a water outlet channel are arranged in the check valve body, the water inlet channel is communicated with the water outlet channel, and the valve cover is detachably connected with the check valve body. A valve assembly used for controlling the water flow direction is arranged at the communication position of the water inlet channel and the water outlet channel. The valve assembly at least comprises a telescopic sleeve and a valve rod, wherein the telescopic sleeve and the valve cover are integrally formed, and the outer wall of the valve rod and the inner wall of the telescopic sleeve are each coated with a lubricating layer. Compared with the prior art, the check valve has the advantages that the lubricating layers are coated on the peripheral side of the valve rod and the inner wall of the sleeve, so that the sliding resistance between the valve rod and the inner wall of the sleeve when the valve rod moves up and down can be reduced, the valve resistance of the check valve is remarkably reduced, the check valve is opened and closed more timely, and the using effect of the check valve is better.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a low-resistance pipeline check valve. Background Art

[0002] A check valve is a valve whose opening and closing parts are circular discs and which blocks the backflow of the medium by its own weight and the pressure of the medium. It belongs to the category of automatic valves and is also called non-return valve, one-way valve, reflux valve or isolation valve. According to the movement of the disc, it is divided into lift type and swing type. Among them, the use principle of the lift check valve is: the medium flows in from the inlet end and flows out from the outlet end. When the inlet pressure is greater than the sum of the weight of the disc and its flow resistance, the valve is opened; on the contrary, the valve is closed when the medium flows back. The lift check valve is used in combination with the stop valve to play a role of safety isolation, but the existing lift check valve still has the disadvantage of large resistance when the valve is opened and closed. In view of this, the inventor has made a new invention. Utility Model Content

[0003] The utility model aims to provide a low-resistance pipeline check valve with the characteristics of low resistance in view of the deficiencies in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model is a low-resistance pipeline check valve, comprising a check valve body and a valve cover detachably connected to the check valve body, wherein a water inlet channel and a water outlet channel are arranged inside the check valve body, wherein the water inlet channel is connected to the water outlet channel, and a valve assembly for controlling the direction of water flow is arranged at the connection between the water inlet channel and the water outlet channel; the valve assembly at least comprises a telescopic sleeve and a valve stem integrally formed with the valve cover, wherein the valve stem is slidably connected to the telescopic sleeve, and a floating plate which can seal the connection between the water inlet channel and the water outlet channel is arranged at the bottom end of the valve stem; the outer wall of the valve stem and the inner wall of the telescopic sleeve are coated with a lubricating layer.

[0005] Preferably, the valve assembly further comprises a driving spring, one end of the driving spring is connected to the telescopic sleeve, and the other end of the driving spring is connected to the top end of the valve stem.

[0006] Preferably, an annular sealing ring is fixedly connected to the outer circumference of the floating plate.

[0007] Preferably, the annular sealing ring is connected to the floating plate by a hot melt welding process.

[0008] Preferably, an annular accommodating groove for accommodating the floating plate is provided at the connection between the water inlet channel and the water outlet channel.

[0009] Preferably, the port of the water inlet channel and the port of the water outlet channel are both provided with connecting flanges.

[0010] Preferably, the water inlet channel and the water outlet channel are both arranged in an arc shape.

[0011] Beneficial effects: Compared with the prior art, the utility model is a low-resistance pipeline check valve, and the utility model has the following advantages: a lubricating layer is coated on the outer peripheral side of the valve stem and the inner wall of the sleeve, which can reduce the sliding resistance between the valve stem and the inner wall of the sleeve when the valve stem moves up and down, thereby significantly reducing the valve resistance of the check valve, making the opening and closing of the check valve more timely, and its use effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall internal structure of the utility model.

[0013] Figure 2 It is a schematic diagram of the longitudinal section structure of the check valve body of the utility model.

[0014] Figure 3 It is a schematic diagram of the top view structure of the floating plate of the utility model.

[0015] Reference numerals include:

[0016] Check valve body--1, water inlet channel--11, water outlet channel--12, annular accommodating groove--13, valve cover--2, valve assembly--3, telescopic sleeve--31, valve stem--32, floating plate--33, driving spring--35, annular sealing ring--36, connecting flange--4. DETAILED DESCRIPTION

[0017] The following is combined with Figures 1 to 3 The utility model is described in detail.

[0018] The utility model discloses a low-resistance pipeline check valve, comprising a check valve body 1 and a valve cover 2 detachably connected to the check valve body 1, wherein a water inlet channel 11 and a water outlet channel 12 are arranged inside the check valve body 1, wherein the water inlet channel 11 is connected to the water outlet channel 12, and a valve assembly 3 for controlling the direction of water flow is arranged at the connection point between the water inlet channel 11 and the water outlet channel 12; the valve assembly 3 at least comprises a telescopic sleeve 31 and a valve stem 32 integrally formed with the valve cover 2, wherein the valve stem 32 is slidably connected to the telescopic sleeve 31, and a floating plate 33 capable of sealing the connection point between the water inlet channel 11 and the water outlet channel 12 is arranged at the bottom end of the valve stem 32; the outer wall of the valve stem 32 and the inner wall of the telescopic sleeve 31 are coated with a lubricating layer. When water flows in from the water inlet channel 11 and converges to collide with the floating plate 33, the floating plate 33 moves up to open the valve, and the water flows into the water outlet channel 12; when the water flows back from the water outlet channel 12 to the water inlet channel 11, the water flows from the top to the floating plate 33, and the floating plate 33 immediately closes the valve to realize the one-way flow of water.

[0019] The lifting check valve of the present technical solution is coated with a lubricating layer on the outer peripheral side of the valve stem 32 and the inner wall of the sleeve, which can reduce the sliding resistance between the valve stem 32 and the inner wall of the sleeve when the valve stem 32 moves up and down, thereby significantly reducing the valve resistance of the check valve, making the opening and closing of the check valve more timely and having a better use effect.

[0020] To further improve the technical solution, the valve assembly 3 also includes a drive spring 35, such as Figure 1 As shown, one end of the driving spring 35 is connected to the telescopic sleeve 31, and the other end is connected to the top of the valve stem 32. When the valve stem 32 drives the floating plate 33 to rise to open the valve or to fall to close the valve, the driving spring 35 can assist the movement of the valve stem 32 and the floating plate 33, making the movement process of the valve assembly 3 more stable and extending the service life of the check valve.

[0021] In order to improve the sealing performance of the floating plate 33, an annular sealing ring 36 is fixedly connected to the outer circumference of the floating plate 33. The annular sealing ring 36 further seals the gap between the floating plate 33 and the check valve body 1 to further prevent water from flowing back.

[0022] Preferably, the annular sealing ring 36 is fixedly connected to the floating plate 33 by a hot-melt welding process. The annular sealing ring 36 installed in this way is more firmly assembled and not easily deformed.

[0023] As an embodiment, an annular receiving groove 13 for receiving the floating plate 33 is provided at the connection between the water inlet channel 11 and the water outlet channel 12. The annular receiving groove 13 enables the floating plate 33 to better seal the valve, and the annular receiving groove 13 can serve as a support point to receive the floating plate 33 that reciprocates up and down.

[0024] Preferably, the ports of the water inlet channel 11 and the water outlet channel 12 are both provided with connecting flanges 4. The connecting flanges 4 facilitate the assembly of the water inlet channel 11 and the water outlet channel 12 of the check valve with external pipes.

[0025] As a preferred example, Figure 1 As shown, the water inlet channel 11 and the water outlet channel 12 are both arranged in an arc shape. The water inlet channel 11 is arranged in an arc shape toward the valve to assist the water flow to the valve; the water outlet channel 12 is arranged in an arc shape toward the direction away from the valve to increase the difficulty of water flow backflow and ensure that the check valve always has one-way flow.

[0026] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A low resistance pipeline check valve, comprising a check valve body (1) and a valve cover (2) detachably connected to the check valve body (1), characterized in that: The check valve body (1) is provided with a water inlet channel (11) and a water outlet channel (12) inside, the water inlet channel (11) is connected to the water outlet channel (12), and a valve assembly (3) for controlling the direction of water flow is provided at the connection point between the water inlet channel (11) and the water outlet channel (12); the valve assembly (3) comprises at least a telescopic sleeve (31) and a valve stem (32) integrally formed with the valve cover (2), the valve stem (32) is slidably connected to the telescopic sleeve (31), and a floating plate (33) capable of sealing the connection point between the water inlet channel (11) and the water outlet channel (12) is provided at the bottom end of the valve stem (32); the outer wall of the valve stem (32) and the inner wall of the telescopic sleeve (31) are both coated with a lubricating layer.

2. A low resistance pipeline check valve according to claim 1, characterized in that: The valve assembly (3) further comprises a driving spring (35), one end of which is connected to the telescopic sleeve (31) and the other end of which is connected to the top end of the valve stem (32).

3. A low resistance pipeline check valve according to claim 1, characterized in that: An annular sealing ring (36) is fixedly connected to the outer circumference of the floating plate (33).

4. A low resistance pipeline check valve according to claim 3, characterized in that: The annular sealing ring (36) is connected to the floating plate (33) by a hot-melt welding process.

5. The low resistance pipeline check valve according to claim 1, characterized in that: An annular accommodating groove (13) for accommodating a floating plate (33) is provided at the connection between the water inlet channel (11) and the water outlet channel (12).

6. A low resistance pipeline check valve according to claim 1, characterized in that: The port of the water inlet channel (11) and the port of the water outlet channel (12) are both provided with a connecting flange (4).

7. A low resistance pipeline check valve according to any one of claims 1 to 6, characterized in that: The water inlet channel (11) and the water outlet channel (12) are both arranged in an arc shape.

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