Spring Balanced Plug Valve

Abstract

The invention discloses a spring balanced cock valve, which comprises a valve body, a cock and a valve stem. The cock is an upside-down tapered valve plug. There is an elastic part, the upper end of the elastic part elastically touches the lower end of the valve stem, and the lower end of the elastic part elastically touches the upper end of the cock, the elastic part is in a compressed state, and the upward force of the elastic part pushes the valve stem to the valve body, so that the stepped surface of the valve stem and the thrust pad Close contact, so as to play a good sealing effect; the downward force of the elastic member pushes the cock down, so that when the sealing surface of the cock and the valve body are closely matched with each other, there is a certain small gap, so that the sealing Grease enters the gap to play a good sealing role, and at the same time, reduces the operating torque of the valve, and the elastic member timely adjusts the force on the valve stem and cock to achieve dynamic balance and avoid the occurrence of jamming.

Description

technical field [0001] The invention relates to a plug valve, in particular to a plug valve with small torque, easy sealing, no noise, rapid opening and closing, and preventing jamming. Background technique [0002] The plug valve is a closing member or a plunger-shaped rotary valve. By rotating 90 degrees, the channel port on the cock is communicated with or separated from the channel port on the valve body to realize opening or closing. The shape of the plug of the plug valve can be cylindrical or conical: in the cylindrical plug, the channel is generally rectangular; in the tapered plug, the channel is trapezoidal. These shapes make the structure of the plug valve light, but at the same time, it also produces a certain loss. Plug valves are most suitable for cutting off and connecting media and diverting, but depending on the nature of the application and the erosion resistance of the sealing surface, they can sometimes be used for blocking. Since the movement between t...

AI Technical Summary

Problems solved by technology

[0012] After years of practical application and summary, it is found that the plug valves with the above two structures still cannot fully satisfy customers during use.

For pressure balanced plug valves, when the valve is opened, the torque of the valve is still very large. After opening, the torque will be reduced due to the balance of pressure, and the moment when the valve torque is the largest is often at the moment of opening and closing. In addition, , if the sealing of the valve is not very good, the pressure balance is difficult to achieve the expected effect; for the lifting plug valve, the customer is not satisfied because of the slow opening and closing speed and the unsatisfactory sealing performance

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