CN209084081U - A pressure self-sealing lift check valve - Google Patents

Abstract

The utility model relates to a pressure self sealss over-and-under type check valve, in particular to valve manufacturing technical field. The utility model discloses a valve body, inlet channel, outlet channel, valve clack, self sealss structure, inlet channel with build-up welding has sealed face between the outlet channel, valve clack middle chamber bottom is equipped with the water conservancy diversion hole, the valve clack lower part with sealed face is mutually supported, the valve clack with be equipped with the cavity between the self sealss structure, self sealss structure includes valve gap, sealing ring, adjustment pad, gland, nut, the valve gap upper end is passed the gland passes through the nut is fixed on the gland, the gland below is equipped with the adjustment pad, the adjustment pad with be equipped with between the valve gap the sealing ring, the valve clack upper end reaches the valve gap bottom is all seted up flutedly, valve clack upper end recess with be equipped with the spring between the valve gap bottom recess. The higher sealing performance of the valve is ensured, and the service life of the valve is prolonged.

Description

A pressure self-sealing lift check valve

technical field

The utility model relates to the technical field of valve manufacturing, in particular to a pressure self-sealing lift check valve.

Background technique

A check valve refers to a valve that automatically opens and closes the valve flap by relying on the flow of the medium itself, and can automatically prevent the backflow of the medium. The opening and closing parts are opened under the action of medium pressure, and the medium flows from the inlet side to the outlet side. When the inlet side pressure is lower than the outlet side, the valve flap is automatically closed under the action of the medium pressure difference, its own gravity and other factors to prevent the fluid from backflowing. Therefore, the check valve is also called "one-way valve", "reverse flow valve" and so on. Due to the simple results and low cost of check valves, check valves are widely used in power plants, chemicals, food, pharmaceuticals and other industries. Lift check valve refers to a check valve whose disc slides along the vertical centerline of the valve body. Lift check valves can only be installed on horizontal pipes. In high temperature and high pressure conditions, due to the structural defects of the traditional check valve, the valve opening and closing speed is slow, which makes the water hammer pressure high, and the sealing performance of the valve body and the valve disc is poor, which seriously affects the efficiency of the entire valve and reduces the service life.

Utility model content

(1) Technical problems to be solved

The utility model provides a pressure self-sealing lift check valve, which overcomes the structural defects of the traditional check valve under high temperature and high pressure conditions, the valve opening and closing speed is slow, the water hammer pressure is large, and the valve body is at the same time. The poor sealing performance with the valve disc seriously affects the efficiency of the entire valve and reduces the shortcoming of service life.

(2) Technical solutions

In order to solve the above technical problems, the present utility model provides such a pressure self-sealing lift check valve, which includes a valve body, an inlet channel, an outlet channel, a valve flap, and a self-sealing structure. One side of the valve body is provided with the Inlet channel, the outlet channel is provided on the other side of the valve body, a sealing surface is surfacing between the inlet channel and the outlet channel, the valve flap is arranged above the sealing surface, and the valve flap is The bottom of the middle cavity is provided with a diversion hole, the lower part of the valve flap cooperates with the sealing surface, the self-sealing structure is arranged above the valve flap, and a space is arranged between the valve flap and the self-sealing structure. The self-sealing structure includes a valve cover, a sealing ring, an adjustment pad, a gland, and a nut. The upper end of the valve cover passes through the gland and is fixed on the gland through the nut. The adjustment pad is arranged below, the sealing ring is arranged between the adjustment pad and the valve cover, the contact surface between the lower end of the sealing ring and the valve cover is a slope, the upper end of the valve flap and the valve cover The bottom of the valve cover is provided with grooves, and a spring is arranged between the groove on the upper end of the valve flap and the groove on the bottom of the valve cover.

Preferably, the slope of the slope of the lower end of the sealing ring is 45 degrees.

Preferably, the material of the sealing surface is cemented carbide.

Preferably, the sealing ring is a flexible graphite metal wound gasket.

(3) Beneficial effects

The utility model provides a pressure self-sealing lift check valve, which overcomes the structural defects of the traditional check valve under high temperature and high pressure conditions, the valve opening and closing speed is slow, the water hammer pressure is large, and the valve body is at the same time. The poor sealing performance with the valve disc seriously affects the efficiency of the entire valve and reduces the shortcoming of service life. Compared with the prior art, the utility model has the following beneficial effects:

1. The design of the self-sealing structure can ensure very high sealing performance of the valve under high temperature and high pressure conditions, and improve the service life of the valve. The use of the spring with the valve disc makes the whole valve open and close quickly and flexibly, preventing the backflow of the medium in time. The bottom of the middle cavity of the valve disc is provided with a diversion hole, so that the pressure on the valve disc and the pressure at the outlet end can be quickly balanced, the valve disc can contact the sealing surface more quickly, and the valve closes faster. When the valve is closed quickly, the water pressure of the water hammer can be reduced and the service life of the valve can be improved.

2. The contact surface between the lower end of the sealing ring and the valve cover is an inclined plane, and the inclination of the inclined plane at the lower end of the sealing ring is 45 degrees, which realizes the overall stress of the sealing ring and further improves the sealing performance of the valve.

3. The sealing ring is a flexible graphite metal wound gasket, which has good corrosion resistance, high temperature and high pressure resistance, good compression resilience and high strength, and is suitable for high temperature and high pressure environments.

4. The setting of the adjustment pad can play an adjustment role to ensure that the force of the valve cover is more uniform when it acts upwards.

Description of drawings

Figure 1 is a schematic structural diagram of the pressure self-sealing lift check valve of the present invention.

Reference numerals are: 1-valve body, 2-inlet channel, 3-outlet channel, 4-sealing surface, 5-disc, 6-spring, 7-cavity, 8-bonnet, 9-seal ring, 10 -Adjust pad, 11- gland, 12- nut, 13- guide hole.

Detailed ways

The utility model will be further described with reference to the accompanying drawings and embodiments.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "vertical", "horizontal", "upper", "lower", "front", "rear", "left" , "right", "top", "bottom", "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, only for the convenience of describing the present utility It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention.

As shown in Figure 1, a pressure self-sealing lift check valve according to the present invention includes a valve body 1, an inlet channel 2, an outlet channel 3, a valve disc 5, and a self-sealing structure. One side is provided with the inlet channel 2, the other side of the valve body 1 is provided with the outlet channel 3, and a sealing surface 4 is surfacing between the inlet channel 2 and the outlet channel 3, and the sealing The valve flap 5 is provided above the surface 4, a guide hole 13 is provided at the bottom of the middle cavity of the valve flap 5, the lower part of the valve flap 5 cooperates with the sealing surface 4, and the valve flap 5 is provided above the valve flap 5. In the self-sealing structure, a cavity 7 is provided between the valve flap 5 and the self-sealing structure. The self-sealing structure includes a valve cover 8, a sealing ring 9, an adjustment pad 10, a gland 11, and a nut 12, so The upper end of the valve cover 8 passes through the gland 11 and is fixed on the gland 11 by the nut 12 . The adjustment pad 10 is arranged under the gland 11 , and the adjustment pad 10 is connected to the valve. The sealing ring 9 is provided between the covers 8, and the contact surface between the lower end of the sealing ring 9 and the valve cover 8 is a slope, and the upper end of the valve flap 5 and the bottom of the valve cover 8 are provided with grooves, so A spring 6 is provided between the groove on the upper end of the valve flap 5 and the groove on the bottom of the valve cover 8 .

The slope of the lower end of the sealing ring 9 is 45 degrees, the material of the sealing surface 4 is cemented carbide, and the sealing ring 9 is a flexible graphite metal wound gasket.

Working principle: When working, the medium flows in from the inlet channel 2. When the pressure in the inlet channel 2 is greater than the pressure in the outlet channel 3, the valve disc 5 compresses the spring 6 under the action of the pressure and moves upward together, so that the valve disc 5 It is separated from the sealing surface 4, and the valve is opened; when the pressure in the outlet channel 3 is greater than the pressure in the inlet channel 2, the valve disc 5 cannot be pushed by the pressure in the inlet channel 2. At this time, the rebound force of the spring 6 and the valve disc 5 Gravity makes the valve disc 5 quickly fit with the sealing surface 4, and the valve closes, preventing the backflow of the medium in the outlet channel. Under the action of pressure, the valve cover 8 moves upward to compress the sealing ring 9, and under the reaction force of the locking of the gland 11, the higher the pressure, the better the sealing performance of the valve. The valve has good sealing performance and can be closed quickly, which can reduce the water pressure of water hammer and prolong the service life of the valve.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but the present invention is not limited to these embodiments, and it should be pointed out that for those of ordinary skill in the art. Under the premise of not departing from the purpose of the present invention, any improvements made fall within the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (4)

1. A pressure self-sealing lift check valve, characterized in that it comprises a valve body (1), an inlet channel (2), an outlet channel (3), a valve disc (5), and a self-sealing structure, the valve body (1) The inlet channel (2) is provided on one side, the outlet channel (3) is provided on the other side of the valve body (1), and the inlet channel (2) is connected to the outlet channel ( 3) A sealing surface (4) is welded between them, the valve flap (5) is arranged above the sealing surface (4), and a guide hole (13) is arranged at the bottom of the middle cavity of the valve flap (5). The lower part of the valve flap (5) cooperates with the sealing surface (4), the self-sealing structure is provided above the valve flap (5), and the valve flap (5) is between the self-sealing structure A cavity (7) is provided, and the self-sealing structure includes a valve cover (8), a sealing ring (9), an adjustment pad (10), a gland (11), and a nut (12). The valve cover (8) The upper end passes through the gland (11) and is fixed on the gland (11) through the nut (12). The sealing ring (9) is arranged between the gasket (10) and the valve cover (8), and the contact surface between the lower end of the sealing ring (9) and the valve cover (8) is an inclined surface, and the valve flap (5) The upper end and the bottom of the valve cover (8) are provided with grooves, and a spring (6) is provided between the upper end groove of the valve flap (5) and the bottom groove of the valve cover (8). 2 . The pressure self-sealing lift check valve according to claim 1 , wherein the inclination of the slope at the lower end of the sealing ring ( 9 ) is 45 degrees. 3 . 3 . The pressure self-sealing lift check valve according to claim 1 , wherein the material of the sealing surface ( 4 ) is cemented carbide. 4 . 4 . The pressure self-sealing lift check valve according to claim 1 , wherein the sealing ring ( 9 ) is a flexible graphite metal wound gasket. 5 .