Double-power two-way composite sealing type low-temperature ball valve

Abstract

The invention relates to a double-power two-way composite sealing type low-temperature ball valve, which comprises a valve seat and a valve core. The soft and hard composite seal of a soft and hard combined elastic structure is formed by a metal hard seal, an inner ring soft seal and a butterfly-shaped spring, and connecting end surfaces between the valve seat and the soft and hard seal are supported by the butterfly spring, so that pre-tightening force is generated on the end surfaces, the valve seat is tightly combined with the valve core under the pre-tightening force effect of the butterfly spring, the sealing performance of the valve seat and the valve core is ensured, particle impurities in the fluid can be effectively prevented from entering hard seal gaps through the soft seal, the abrasion between the hard seal valve seat and the valve core is reduced, the service life of the valve is improved, the valve rod adopts a duplex sealing structure, the valve body and the valve rod seal adopt double butterfly-shaped elastic gaskets, the contact pressure between the valve rod and the sealing element is maintained, the sealing performance is improved, the valve rod and the sleeve adopt adjustable elasticity uniform-pressure type pre-tightening seal, the outward leakage of the valve is reduced, the valve is provided with a circular disc for installing electric, hydraulic and pneumatic drivers, an electric, hydraulic and pneumatic driving device can be conveniently installed, and the manual and automatic double-power conversion can be realized.

Description

technical field [0001] The invention relates to a valve, in particular to a double-power bidirectional composite sealing low-temperature ball valve. Background technique [0002] At present, the sealing structure of low temperature floating ball valve imported from home and abroad is generally soft seal or hard seal. The soft seal is easy to wear during use and has a short service life. , but its sealing performance is not ideal; the sealing valve seat is divided into fixed type and compensable type. The general compensation type is realized by elastic elements. At present, there are few applications for sealing through the pressure of the fluid medium itself. Most of the soft sealing materials are polytetrafluoroethylene, which is used at a temperature above -65°C, and the material performance cannot meet the working requirements when the temperature is lower. The hard seal material generally adopts metal seal, which requires the sealing surface material to have good wear ...

AI Technical Summary

Problems solved by technology

In the present invention, the disc spring arranged between the upstream valve seat and the upstream valve body is used to make the upstream valve seat stick to the ball all the time, even under the condition of low temperature or serious deformation of the parts, it can still ensure the good sealing performance of the ball valve. However, this patent only uses springs made of hard sealing materials as compensation, which is prone to wear and tear and leads to higher maintenance costs

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