Visually locked swing check valve

Abstract

The invention provides a swing check valve, and belongs to the technical field of valve manufacturing. The swing check valve solves the problems that an existing check valve is tedious in assembly, multiple in movable point, complex in machining technology and the like, meanwhile, the operation process of a check valve plate can be visualized, and locking of the check valve plate under the determined different opening degrees is achieved. The swing check valve comprises a valve body, a valve cover, a check valve plate, a U-shaped fixing piece, a connecting shaft and a scale hand wheel assembly; and the check valve plate is connected with the connecting shaft through threads, the valve plate can rotate around the U-shaped fixing piece on the inner side wall of an upper cavity through the connecting shaft, and meanwhile one end of the connecting shaft penetrates out of the upper cavity of the check valve and can be locked with a protruding boss on the outer wall through a bolt. The swing check valve can solve the problem that the opening degree of the valve plate affects safe passing of a pipe cleaner or an internal detection device due to small flow pressure difference, and meanwhile has the characteristics of being simple in structure, low in maintenance cost, high in market competitiveness, high in practicability and the like.

Description

technical field [0001] The invention belongs to the technical field of valve manufacturing and relates to a visually locked swing check valve. Background technique [0002] Valves are often used as fluid switches in pipeline engineering, and some pipeline engineering requires that fluid flow in a fixed direction. The check valve is a valve that blocks the reverse flow of the medium by its own weight and medium pressure, and belongs to the automatic valve category. When the fluid is cut off, the check valve plate will reversely move under the action of gravity, and realize sealing and tight contact with the valve seat to prevent the fluid from flowing backward. The traditional swing check valve is complicated to assemble, and the pin shaft at the valve plate requires high processing requirements, and the opening degree of the valve cannot be determined, and it cannot be locked at a certain angle of valve plate opening. [0003] Existing one-way check valves, for example, Ch...

AI Technical Summary

Problems solved by technology

The one-way check valve with this structure has a simple structure and is easy to assemble, but during the rotation of the one-way check valve with this structure, the friction between the valve plate lug and the card groove is relatively large, and long-term operation will cause serious wear. , affecting the positive direction of the valve plate rotation and sealing, the service life is not long, it needs to be replaced and repaired regularly, and the economic applicability is not strong

At the same time, when the pressure difference between the inlet and outlet channels is small, the opening of the valve plate is small, which is not conducive to the safety of internal detection and pigging process operation during pipeline management and operation.

Images