Wedge-caulking parallel sluice valve

Abstract

The invention relates to a wedge-caulking parallel sluice valve. The wedge-caulking parallel sluice valve comprises a valve body, a valve seat, a flashboard, a valve rod, a valve cover, supports and a driving device. The flashboard is in a parallel flashboard structure which consists of a left flashboard and a right flashboard. The upper end of the valve rod is connected with an output shaft of the driving device through a valve-stem nut in a threaded mode and the lower end of the valve rod is connected with a wedge block. The left flashboard and the right flashboard are connected on the valve rod through a flashboard support. Wedge-caulking devices are installed on the inner surfaces of the left flashboard and the right flashboard. The upper end of the wedge block is connected with an elastic plate and a T-shaped groove is formed at the lower end of the valve rod. The valve rod is connected with the elastic plate in a matched mode through the T-shaped groove, wherein the elastic plate is located on the wedge block. The lower end of the valve rod is connected with a connecting hole of the flashboard support in a gap mode through a T-shaped joint. The upper end of the wedge block is connected with the valve rod in an elastic mode. The pressing force change between the flashboard and the valve seat are caused by that the elastic plate can absorb high temperature to expand and absorb low temperature to shrink. Friction-free opening and closing are achieved. The wedge-caulking parallel sluice valve has the advantages of being reliable in opening and closing, good in sealing property, long in service life and the like. The wedge-caulking parallel sluice valve is suitable for sluice valves of high temperature and high pressure working condition pipes.

Description

technical field [0001] The invention relates to the field of valves, in particular to a parallel gate valve. The invention is suitable for the gate valve of pipelines under high temperature and high pressure working conditions. Background technique [0002] Gate valve is one of the most commonly used valves and is widely used in various industrial pipeline systems. Its structure types include single-plate gate valves, wedge gate valves, parallel gate valves, and wedge-type double-disc gate valves. Single-plate gate valves and parallel gate valves rely on medium pressure to seal the gate and valve seat, and are prone to leakage when the medium pressure is low. Wedge gate valves and wedge double gate valves use wedge gates or wedge blocks to wedge the gates and valve seats on both sides to achieve forced sealing, and have good sealing performance. For example, the flat gate valve whose patent number is ZL95226065.4 is composed of valve body, valve seat, gate plate, valve ste...

AI Technical Summary

Problems solved by technology

Its main disadvantages are: the wedge fits between the wedge and the left and right gates, and the valve stem and the wedge are rigidly fixedly connected. The wedge is dead due to high temperature expansion, and when the temperature drops, the wedging force between the wedge and the left and right gates will decrease due to low temperature contraction, which will reduce the sealing specific pressure between the gate and the valve seat, and leakage will easily occur. , the wedge moves up when it is wedged tightly with the left and right rams, and the left and right rams have the force to move upwards, so that a large friction force is generated between the left and right rams and the valve seat, and the sealing surface is generated. Wear and tear, its working reliability and sealing performance are poor, and the service life of the product is low

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