CN207569281U - The lumen pressure relief of double-piston effect ball valve - Google Patents

Abstract

The utility model discloses a kind of lumen pressure reliefs of double-piston effect ball valve, and including valve body, by-pass line is equipped on valve body, and the lumen of valve body is connected by by-pass line with the upstream line of valve body or downstream line, and by-pass line is equipped with check-valves.The beneficial effects of the utility model are：It can effectively reduce the pressure of ball valve lumen after lumen pressure medium sharply increases.

Description

Middle cavity pressure relief structure of double piston effect ball valve

technical field

The utility model relates to the technical field of ball valves, in particular to a middle cavity pressure relief structure of a double-piston effect ball valve.

Background technique

Ball valves are widely used to collect and discharge impurities such as coal slag and coal ash in coal chemical plants due to their advantages of small flow resistance, rapid opening and closing, and compact structure. The working conditions of the valve are relatively harsh, and the medium flowing through it is generally High temperature medium, so the valve is required to have good sealing performance. Among the existing ball valves, there are mainly single-piston ball valves and double-piston ball valves, and when the ball valve is closed, the valve seat of the double-piston ball valve is always pushed toward the ball regardless of the pressure in the cavity or the pressure in the pipeline. , so it has a better sealing effect.

In some working conditions where medium leakage is absolutely not allowed, the sealing performance of the valve is particularly strict, and the sealing performance of the double-piston ball valve is much better than that of the general ball valve, which can meet the specified requirements. In natural gas pipelines, double-piston ball valves are widely used. For example, the "West-to-East Gas Transmission" project being implemented in my country, the double-piston effect valve plays an important role in promoting. Due to the double-piston effect ball valve’s two-way sealing feature, the medium in the middle chamber cannot be automatically discharged, and the temperature change will cause a sharp increase in the medium pressure in the middle chamber, which will cause a series of problems such as damage to internal parts and increased opening torque.

Utility model content

The purpose of the utility model is to provide a middle cavity pressure relief structure of a double-piston effect ball valve, which can effectively reduce the pressure of the middle cavity of the ball valve after the medium pressure of the middle cavity increases sharply.

In order to achieve the above object, the utility model provides the following technical solutions:

A middle chamber pressure relief structure of a double-piston effect ball valve, including a valve body, on which a bypass pipe is installed, the bypass pipe connects the middle chamber of the valve body with the upstream pipe or downstream pipe of the valve body, and the bypass pipe is Equipped with check valve.

Preferably, one end of the bypass pipe is sealingly connected with the middle cavity of the valve body through an NPT thread, and the other end of the bypass pipe is connected with an upstream pipe or a downstream pipe of the valve body through an NPT thread.

The working principle of the utility model is: after the pressure in the middle cavity of the valve body reaches the set value, the pressure will push open the check valve inside the bypass pipeline, and the pressure will be released into the upstream pipeline or downstream pipeline through the bypass pipeline.

The beneficial effect of the utility model is that it can effectively reduce the pressure in the middle cavity of the ball valve after the medium pressure in the middle cavity increases sharply.

Description of drawings

Fig. 1 is the schematic diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

The technical scheme of the concrete implementation of the utility model is:

As shown in Figure 1,

A middle chamber pressure relief structure of a double-piston effect ball valve, comprising a valve body 1, a bypass pipe 2 is installed on the valve body 1, and the bypass pipe 2 connects the middle chamber of the valve body 1 with the upstream pipe 3 or downstream of the valve body 1 The pipeline 4 is connected, and the bypass pipeline 2 is provided with a check valve.

One end of the bypass pipe 2 is in sealing connection with the middle chamber of the valve body 1 through an NPT thread, and the other end of the bypass pipe 2 is connected with the upstream pipe 3 or the downstream pipe 4 of the valve body 1 through an NPT thread.

The working principle of the utility model is: after the pressure in the middle cavity of the valve body 1 reaches the set value, the pressure will push open the check valve inside the bypass pipeline 2, and the pressure will be released to the upstream pipeline 3 or downstream pipeline through the bypass pipeline 2 4 within.

The beneficial effect of the utility model is that it can effectively reduce the pressure in the middle cavity of the ball valve after the medium pressure in the middle cavity increases sharply.

The above is only the preferred embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and modifications can also be made. And retouching should also be regarded as the protection scope of the present utility model.

Claims (1)

1. A middle cavity pressure relief structure of a double-piston effect ball valve, characterized in that it comprises a valve body, a bypass pipeline is installed on the valve body, and the bypass pipeline connects the middle cavity of the valve body with the upstream pipeline or downstream pipeline of the valve body The bypass pipe is provided with a check valve; one end of the bypass pipe is tightly connected to the middle cavity of the valve body through an NPT thread, and the other end of the bypass pipe is connected to the upstream or downstream pipe of the valve body through an NPT thread.