Supporting type double-seal double-gate plate flat plate gate valve

Abstract

The invention provides an unfurled dual-sealing gate valve, comprising two slab valve plates which are arranged at the left side and the right side in the valve body; the lower end of a valve rod is fixedly connected with an upper wedge; two slab valve plates are fixedly arranged in the horizontal hole which is arranged at the upper and middle part of the upper wedge; a lower wedge is sleeved right below the upper wedge; the upper wedge is provided with an inclined surface which faces outwards from top to bottom; the lower wedge is also provided with an inclined surface which has the same inclined angle with the upper wedge and is corresponding to the inclined surface of the upper wedge; a compression spring is arranged between the upper wedge and the lower wedge; a non-metal sealing ring and a metal sealing ring are arranged in the vertical sealing surfaces on the valve seats at two sides of the slab valve plates corresponding to the slab valve plates; the external side sealing surface of the non-metal sealing ring is higher than the sealing surface of the metal sealing ring, thus forming a dual-sealing structure. The gate valve forms dual main sealing structure between metals and between metal and non-metal, can completely meet the medium transmission working condition at a temperature not more than 230 DEG C, and ensures no leakage.

Description

technical field [0001] The invention relates to a gate valve, which is especially suitable for the transportation working conditions of refined oil, natural gas, coal gas and media whose temperature is not higher than 230°C. Background technique [0002] The development of gate valve has a long history, from the original canal plate gate valve to the modern high temperature and high pressure gate valve, because of its advantages of small flow resistance and no direction restriction for installation, it is widely used in many fields of the national economy and has become a One of the largest and most widely used valves. However, the traditional gate valve also has some disadvantages, such as relatively low sealing performance, the existing gate valve can only exert force in the direction perpendicular to the pipeline by manipulating the valve stem, and its direction along the pipeline axis, that is, the gate valve The force that forms the seal between the gate and seat of th...

AI Technical Summary

Problems solved by technology

However, the structure of this type of gate valve in the prior art is relatively complicated, and the external dimensions are large and occupy a large space, which also limits its scope of use to some extent.

However, the gate valve in the prior art only relies on the horizontal force generated by the wedge to squeeze the sealing surface of the gate and the valve seat, and the sealing performance will decrease with the increase of the pressure under high pressure conditions. difficult problem

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