Elastic seal-sealing sleeve type check valve

Abstract

An elastic seal-sealing sleeve type check valve comprises a valve body, a valve seat, a valve clack and a valve cover, wherein the valve clack is a sleeve type self-sealing valve clack; the valve seat is arranged on a flowing channel in the middle of the valve body, the valve seat and the valve body are matched together through threads, and a first composite metal wound gasket is pressed between the valve seat and the valve body to form seal; the valve clack is arranged on the valve seat, and multiple layers of O-type sealing rings are arranged between the valve clack and the valve body; a pretightening spring is arranged in the center of the valve seat, the upper end of the spring is directly contacted with the valve cover, the valve clack and the valve cover jointly fix the spring in the middle, a second composite metal wound gasket is arranged between the valve cover and the valve body, and the valve cover and the valve body are tightly assembled through fasteners, namely, studs and nuts. The O-type sealing rings are arranged between the sleeve type valve clack and the valve body to form first seal, corrosion of a corrosive medium to the spring is effectively prevented, the service life of the spring is prolonged, and the cost is indirectly reduced; the metal wound gaskets between the valve body and the valve cover are fixed through fasteners to form second seal.

Description

technical field [0001] The invention relates to a valve with self-sealing function for flow medium, and more particularly relates to an elastic self-sealing sleeve check valve. Background technique [0002] In the current process of pipeline medium transportation, many places need to automatically prevent the backflow of the medium during the process of pressure drop, especially in the process of liquid transportation, it is particularly prominent; many traditional check valves are used in low-pressure pipelines In the middle, because the pressure difference at both ends of the valve is small and there is no self-sealing recovery force, it is difficult for the check valve to achieve a good anti-backflow effect only by relying on this part of the pressure difference. When the pressure is not provided and the pressure is continued upward, the pressure of the upper part may be higher than that of the lower part, and the liquid will seep through the valve and return to the lower...

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