CN211975990U - Back pressure balanced type stop check valve - Google Patents

Abstract

The utility model discloses a back pressure balance type cut-off check valve, which is characterized in that: the utility model consists of a handle, a valve stem nut, a valve stem, a valve body, a valve cover, a bushing, a valve seat, a valve disc, a spring, The lower end of the valve body is equipped with a valve seat, the upper end of the valve seat is equipped with a bushing, the upper end of the bushing is equipped with a valve cover, the upper end of the valve seat inside the bushing is equipped with a valve disc, and the upper end of the valve disc is equipped with a spring, The upper end of the spring is equipped with a piston. The valve body is provided with a water inlet and a water outlet, the upper end of the piston is provided with a balance chamber, the piston is provided with a balance hole, the lower end of the piston is provided with a circulation hole, and the water outlet is communicated with the circulation hole, the balance hole and the balance chamber. The middle part of the valve body is provided with a valve cavity, and the lower part of the bushing is provided with a medium through hole. The utility model has the advantages of simple valve structure, flexible opening and closing of the valve provided with a pressure balance mechanism, good valve sealing performance, long service life, and dual functions of cut-off and non-return.

Description

A back pressure balanced cut-off check valve

technical field

The utility model provides a medium-transporting pipeline valve suitable for industries such as petroleum and chemical industry, which is a back-pressure balance type cut-off check valve, which is used for start-stop and check-back.

Background technique

At present, the domestic check valve is generally composed of main parts such as valve body, valve cover, valve stem, valve seat, valve disc, etc. The stop check valve does not have a pressure balance mechanism, and the opening and closing valve must overcome the pressure of the high-pressure medium on the valve disc. , Valve switching is very difficult.

SUMMARY OF THE INVENTION

The purpose of this utility model is to overcome the shortcoming that the cut-off check valve in the prior art has no pressure balance mechanism, the opening and closing valve must overcome the pressure of the high-pressure medium on the valve disc, and the valve opening and closing is very difficult, and provides a back-pressure balanced cut-off check valve. Return valve, the valve can be opened and closed flexibly and has the dual functions of cut-off and non-return.

The technical scheme adopted by the utility model to solve the technical problem is as follows: the utility model is composed of a handle, a valve stem nut, a valve stem, a valve body, a valve cover, a bushing, a valve seat, a valve disc, a spring and a piston, and the lower end of the valve body is equipped with There is a valve seat, the upper end of the valve seat is equipped with a bushing, the upper end of the bushing is equipped with a valve cover, the upper end of the valve seat inside the bushing is equipped with a valve disc, the upper end of the valve disc is equipped with a spring, and the upper end of the spring is equipped with a piston.

The valve body is provided with a water inlet and a water outlet, the upper end of the piston is provided with a balance chamber, the piston is provided with a balance hole, the lower end of the piston is provided with a flow hole, and the water outlet communicates with the flow hole, the balance hole and the balance chamber.

A valve cavity is arranged in the middle of the valve body, and a medium through hole is arranged in the lower part of the bushing.

The utility model has the advantages of simple valve structure, flexible opening and closing of the valve provided with a pressure balance mechanism, good valve sealing performance, long service life, and dual functions of cut-off and non-return.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a front cross-sectional view of an embodiment of the present invention.

In Figure 1, 1 handle, 2 valve stem nut, 3 valve stem, 4 valve cover, 5 bushing, 6 piston, 7 spring, 8 valve disc, 9 valve seat, 10 valve body, A water inlet, B water outlet, C balance cavity, D flow hole, E balance hole, F valve cavity, G medium through hole.

Detailed ways

In Fig. 1, a back pressure balanced check valve consists of a handle (1), a valve stem nut (2), a valve stem (3), a valve body (10), a valve cover (4), and a bushing (5) , valve seat (9), valve disc (8), spring (7), piston (6), the lower end of the valve body (10) is equipped with a valve seat (9), and the upper end of the valve seat (9) is equipped with a bushing (5), the upper end of the bushing (5) is equipped with a valve cover (4), the upper end of the inner valve seat (9) of the bushing (5) is equipped with a valve disc (8), and the upper end of the valve disc (8) is equipped with a spring (7) The upper end of the spring (7) is equipped with a piston (6). The valve body (10) is provided with a water inlet (A) and a water outlet (B), the upper end of the piston (6) is provided with a balance chamber (C), the piston (6) is provided with a balance hole (E), and the piston (6) There is a flow hole (D) at the lower end of the water outlet (B), and the water outlet (B) is communicated with the flow hole (D), the balance hole (E) and the balance cavity (C). A valve cavity (F) is provided in the middle of the valve body (10), and a medium through hole (G) is provided in the lower part of the bushing (5).

A pressure balance mechanism of a back pressure balance type cut-off check valve is composed of a piston (6), a bushing (5), a valve cover (4), a valve stem (3), and a balance hole (E) on the piston (6). A balance chamber (C) is formed. When the water outlet (B) has a return pressure, the medium flows back into the valve body from the water outlet (B), and the medium flows from the water inlet (B) through the medium through holes (G) and the flow holes (D). ), the balance hole (E) reaches the balance chamber (C), the pressure of the medium on the upper and lower ends of the piston (6) is basically equal, and the opening and closing of the valve only needs to overcome the friction resistance, and the opening and closing valve is very flexible.

A sealing and non-return mechanism of a back pressure balanced cut-off check valve is composed of a valve disc (8), a valve seat (9), a spring (7), and a piston (6). When the valve is in a closed state, the piston (6) ) Press the valve disc (8) on the valve seat (9), the sealing pair between the valve disc (8) and the valve seat (9) cuts off the circulation of the medium, and the valve is cut off. When the valve is in the open state, the upper end of the piston (6) is in contact with the lower end surface of the valve cover (4), the medium pressure of the water inlet (A) acts on the lower end of the valve disc (8), and the valve disc (8) compresses the spring upward. (7) The valve disc (8) is separated from the valve seat (9), and the medium reaches the valve cavity (F) from the water outlet (B) through the gap between the valve disc (8) and the valve seat (9) from the water inlet (A). body (10). At this time, when the water inlet (A) stops entering water, the valve disc (8) pushes the valve disc (8) to move down under the elastic force of the spring (7), and presses the valve seat (9), the medium From the water outlet (B), the medium through hole (G), and the through hole (D) to the upper end of the valve disc (8), the valve disc (8) further presses the valve seat (9) under the pressure of the medium, and the valve realizes a non-return seal.

The working principle of the utility model is as follows: the handle (1) is rotated counterclockwise, the valve stem nut (2) is rotated counterclockwise and the valve stem (3) moves upward, the valve stem (3) drives the piston (6) to move upward, and the water inlet (A The medium pressure of ) acts on the lower end of the valve disc (8), the valve disc (8) moves up the compression spring (7), the valve disc (8) is separated from the valve seat (9), and the medium passes through the valve disc ( ) from the water inlet (A). 8) When the gap with the valve seat (9) reaches the valve cavity (F), the valve body (10) is output from the water outlet (B), and the valve is opened. At this time, when the water inlet stops entering water, the valve disc (8) pushes the valve disc (8) to move downward under the action of the elastic force of the spring (7), the valve disc (8) presses the valve seat (9), and the medium is The water outlet (B), the medium through hole (G), and the through hole (D) reach the upper end of the valve disc (8), the valve disc (8) further presses the valve seat (9) under the medium pressure, and the valve realizes a non-return seal .

Turn the handle (1) clockwise, the stem nut (2) rotates clockwise, the stem (3) moves down to drive the piston (6) down, and the piston (6) presses the valve disc (8) against the valve seat On (9), the sealing pair between the valve disc (8) and the valve seat (9) cuts off the flow of the medium, and the valve closes.

Claims (3)

1. A back pressure balanced globe check valve, comprising a handle (1), a valve stem nut (2), a valve stem (3), a valve body (10), a valve cover (4), a bushing (5), The valve seat (9), the valve disc (8), the spring (7), and the piston (6) are composed, and it is characterized in that: the lower end of the valve body (10) is provided with a valve seat (9), and the upper end of the valve seat (9) is provided with a valve seat (9). There is a bushing (5), the upper end of the bushing (5) is provided with a valve cover (4), the upper end of the inner valve seat (9) of the bushing (5) is provided with a valve disc (8), and the upper end of the valve disc (8) is provided A spring (7) is installed, and a piston (6) is installed on the upper end of the spring (7). 2. A back pressure balance type cut-off check valve according to claim 1, characterized in that: the valve body (10) is provided with a water inlet (A) and a water outlet (B), and the upper end of the piston (6) is provided with a water inlet (A) and a water outlet (B). There is a balance cavity (C), a balance hole (E) is arranged on the piston (6), a flow hole (D) is arranged at the lower end of the piston (6), a water outlet (B), a flow hole (D), a balance hole (E) ) and the balance chamber (C) are connected. 3. A back pressure balance type globe check valve according to claim 2, characterized in that: the valve body (10) is provided with a valve cavity (F) in the middle, and the lower part of the bushing (5) is provided with a medium through hole (G).

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