Check valve with zero-friction stroke indicating device

Abstract

The invention discloses a check valve with a zero-friction stroke indicating device. The check valve comprises a valve body and an end flange, and the end flange is connected with the valve body in a sealed mode; a rotating shaft is arranged in the valve body and provided with a shaft sleeve; a limit switch is arranged on the end flange, and the limit switch and the end flange are arranged with a 30-degree included angle; a positioning rod is arranged on the end flange, a platform is arranged at one end of the rotating shaft, a magnet assembly used for triggering the limit switch is installed on the platform, and a special-shaped groove for the magnet assembly to move is formed in the end flange. The limit switch is installed at the end of the end flange in the mode of inclining by 30 degrees to achieve position feedback of the check valve, so that the check valve with the zero-friction stroke indicating device has the advantages of being free of run-through or friction and compact in structure, the structure size is not remarkably increased, the check valve can be overhauled just by opening the flange, and the whole structure is high in maintainability.

Description

technical field [0001] The invention relates to a check valve with position feedback, in particular to a check valve with a frictionless stroke indicating device. Background technique [0002] The check valve is a valve that controls the one-way flow of the medium in the pipeline, and is used to prevent the medium in the pipeline from flowing backward. Swing check valve is the most common structural form of check valve. The movement mode is to rotate around the rotating shaft above the valve seat. This type of check valve has mature technology and is convenient for maintenance. [0003] Ordinary check valves do not have a stroke indicating mechanism, but for check valves at key positions in some important systems, the control system needs to know whether the actual working position is fully open or fully closed to ensure the safety of the system. If the method of directly outputting the shaft on the valve body is adopted, the structure is relatively simple. However, packin...

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Problems solved by technology

However, the stuffing seal on the protruding shaft will generate a lot of friction, which will seriously affect the action of the valve.

Moreover, the leakage of packing material is also unacceptable in radioactive working conditions such as nuclear power plants.

The current existing solutions are non-penetrating structures, one is end installation, the advantage is that the structure is relatively compact, but the induction magnet and the end face of the flange are always in contact, there is always friction during the movement, and long-term use may cause damage to the surface of the induction magnet. The plating layer falls off; the other structure is side installation, which is relatively bulky and not conducive to space layout

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