Forced seal valve capable of conducting eccentric double-spherical-angle stroke operation

Abstract

The invention relates to a forced seal valve capable of conducting eccentric double-spherical-angle stroke operation. The forced seal valve mainly comprises a valve body, an opening and closing piece, a valve deck, a valve rod, valve bases, a valve base supporting plate, an operation mechanism, a blowdown valve and the like. The opening and closing piece comprises two eccentric spherical structures. By means of the eccentric structures, when the valve rod drives the opening and closing piece to rotate, two eccentric spherical faces can both move in the axis directions of the downstream valve base and the upstream valve base, and therefore the effect of pressing or releasing the valve bases is achieved, and forced sealing of the opening and closing piece, the downstream valve base and the upstream valve base under the specific valve position is achieved. In addition, a module can be formed by the opening and closing piece, the valve rod, the valve bases, the valve base supporting plate and the valve deck, the whole module can be pulled out of the valve as a whole after fastening pieces through which the valve deck and the valve body are connected are detached, and therefore easily-damaged parts of the valve can be replaced in a modularized manner.

Description

technical field [0001] The invention relates to a valve, in particular to an eccentric double-spherical angular-stroke operated forced sealing valve which facilitates the replacement of the valve core. Background technique [0002] As the "throat" of various pipeline systems in petroleum, chemical, electric power, metallurgy, papermaking and other industries, valves are widely used in the above industries, and ball valves are one of the most widely used valve types. [0003] Ordinary ball valves generally include valve body, valve stem, valve cover, ball, valve seat, etc. The valve stem is connected to the ball through transmission, so that the ball rotates to change the relative relationship between the ball flow channel and the valve seat to achieve opening and closing. medium purpose. The operation of the ball valve is usually a 90° angular stroke operation, which has the advantages of quick switching and convenient operation, and the sealing surface of the valve seat an...

AI Technical Summary

Problems solved by technology

However, the disadvantage of ordinary ball valves is that no matter what position the ball is in relative to the valve seat, the degree of compression between the two is the same, that is, the sealing specific pressure between the two is the same at any valve position, which makes The choice of sealing specific pressure between the two has become a dilemma: choosing a higher sealing specific pressure will accelerate the wear of the ball sealing surface and the seat sealing surface, while choosing a lower sealing specific pressure will not guarantee the sealing performance of the valve

After investigation, there is currently no forced sealing valve that uses eccentric double spherical surfaces as mandatory sealing elements.

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