Single open double seal parallel type gate valve

Abstract

This invention is a single-startup double sealed parallel sluice board valve, and belongs to F16K field of International Patent Classifying Form. It includes an exterior shell of the valve gate, which is composed of a valve case, a valve cover, a connector and a hand wheel. In the chamber of the valve casing are the valve pole and the sluice board. The hand wheel drives the nut of the valve pole, the nut drives the valve pole, and the pole drives the sluice board through the trapeziform thread, at the bottom of the interior chamber of the valve case is a power-fixing rod, the sluice board train is composed of two symmetrical sluice boards, on the top of the board is a T-shaped groove that is used to connected fixedly with the valve rod, in the middle of the board is a big through hole linking to the flow hole on the two ends of the valve case, above the big hole is a wedging slipper groove, the bottom of the big hole is connected with the small passage. This invention solves the problems of low-pressure sealing and power cannot be add manually. Its characteristics are: novel design, special exterior, small size, light weight, easily switches and energy saving, and it is suitable for the pipelines of oil chemistry and other industry of transferring the fluid medium.

Description

technical field [0001] The invention relates to a parallel gate valve, in particular to a single-opening double-dense parallel gate valve, which is an improvement on the structure of the existing plate valve, belongs to the F16K technical field in the international patent classification table, and is suitable for use in It is used for cut-off adjustment flow on high, medium and low pressure pipelines conveying fluid media in petroleum, chemical and other industries. Background technique [0002] At present, there are many types of valves used to cut off and close the medium flow on the pipeline: one is a ball valve with a spherical shape that can block the liquid flow in front to close the liquid flow, and the other is a disc-shaped valve that is lowered from above relative to the liquid flow. There is a gate valve that isolates the liquid flow in the pipeline, and a one-way stop valve that prevents reverse flow. Chinese invention patent application No. 94114087.3 has provi...

AI Technical Summary

Problems solved by technology

There are certain deficiencies in the above-mentioned existing technologies: some structures require a large operating torque, so they are not suitable for large-sized valves, and have the disadvantages of large fluid resistance; It is difficult to open and close, and it is difficult to manufacture in small-caliber occasions; and the sealing surface is washed continuously by the medium when it is opened, and the sealing surface is easily damaged by the medium, especially the single seal of the original flat gate valve cannot be closed by external force. , and rely on the pressure of the medium flow to complete, resulting in high machining accuracy, short service life and increased production costs

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