Forced sealing control valve

Abstract

The present invention relates to a strong seal control valve, concretely adapting the rigor medium work condition with high pressure difference and strong friction. The control valve mainly includes a valve body, an upper valve cover, a valve seat, and an upper valve spindle, and is characterized in that a valve core sleeve member is composed of a valve sleeve, a sealing gasket and a valve core, the valve sleeve lies on the outer side of the valve core sleeve member, a disk spring is disposed on the upper side of the valve sleeve, the sealing gasket is fixed between the valve core and a lower valve spindle, the lower valve spindle and the valve core are coupled together and disposed in the valve seat, a winding gasket is disposed between the upper valve cover and a guide seat. The invention can form a first seal by the valve sleeve and the valve seat to prevent the big medium particle flowing in and protect the seal members in the valve from being abraded, and can ensure a second seal for the seal gasket and the valve seal for long time, if the above two seals are invalid, the valve core and the valve seat can still form a third seal only if the valve sleeve and the seal gasket provide a certain throttle effect, the third seal can ensure the medium to be cut off, and can greatly reduce the rate of the generation of jamming fault and diminish the maintain work.

Description

technical field [0001] The invention relates to a strong sealing control valve, in particular, it is suitable for harsh medium working conditions with high pressure difference and strong friction, such as gas transportation of particles or powder. Background technique [0002] Before the present invention was made, in the prior art, the usual control valve sealing structure was mainly composed of a valve body, a valve core, a valve stem, a valve seat and the like. Its seal can be a metal hard seal, or a soft seal between PTFE and metal, but its common feature is that there is only one seal. The control valve of this structure is only suitable for regulating or cutting off general media. In the gas conveying condition of particles or powder, this kind of control valve improves the hardness and wear resistance by surfacing hard alloy on the sealing part, but the effect is not ideal, and the service life is only two to three months, so the control valve should be replaced freq...

AI Technical Summary

Problems solved by technology

In the gas conveying condition of particles or powder, this kind of control valve improves the hardness and wear resistance by surfacing hard alloy on the sealing part, but the effect is not ideal, and the service life is only two to three months, so the control valve should be replaced frequently Very uneconomical and not conducive to serial production

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