Majae non-return valve

Abstract

The majae non-return valve has the pressure difference on two sides of the valve clack utilized for make-and-break in the direction opposite to the fluid flow so as to avoid the impact and water hammer on the valve clack. The majae non-return valve includes valve body, valve clack, valve seat, sleeve, sleeve cover, guide cover, spoke shaped rack, pulse duct, bearing housing, sealing ring, closure head assembly and fastener. The valve clack with I-shaped longitudinal section can move inside the sleeve like a piston. When fluid enters the valve in the forward direction, the fluid penetrates the rectangular opening on the sleeve wall to form axial pressure difference to drive the valve clack reversely so as to open the valve. When fluid moves inversely, partial fluid crashes into the cavity in front of the valve clack and the valve clack under the action of pressure difference moves in forward direction to shut off the valve. The present invention has simple structure, reliable operation and other advantages.

Description

technical field [0001] A flush check valve used in fluid transfer or hydraulic control lines to prevent backflow of fluid. It belongs to the field of engineering components or parts. Background technique [0002] Check valves (also known as one-way valves or check valves) are basic components in fluid delivery or hydraulic control engineering and are widely used. Its basic function is to prevent fluid backflow and ensure the normal and effective operation of fluid machinery or devices in the pipeline. However, the movement speed of the opening and closing parts (such as the disc or disc) in traditional check valves is often very high. Huge fluid pressure fluctuations are generated, and the maximum value may reach more than six times the normal pressure of the pipeline (commonly known as water hammer phenomenon). The resulting fluctuating pressure will spread rapidly along the entire pipeline system, and at the system boundary (such as the pipeline turning point) reflectio...

AI Technical Summary

Problems solved by technology

The advantage of this scheme is that the structure of the check valve is simple and the operation reliability is high; the disadvantage is that the movement of the fluid in the valve body is complicated, and its hydraulic damping characteristics are difficult to meet the specified requirements through parametric design. In addition, the required damping is proportional to the flow velocity and flow rate of the pipeline, and the damping provided by the hydraulic damper is roughly proportional to the force area of ​​the fluid in the pressure chamber (reflected as the volume of the pressure chamber), and is directly proportional to the interception The hole area is inversely proportional. Due to the structural limitation of the valve body, it is often impossible to expand the volume of the pressure chamber infinitely and reduce the area of ​​the shut-off hole. As a result, most hydraulic damping check valves cannot be applied to large flow rates, large flow rates, and geometric dimensions of pipelines. Pipelines with Lower Limit Requirements

The hybrid damper tries to optimize the opening and closing characteristics of the check valve through the complementary advantages of the above two dampers, but no breakthrough or application results have been achieved

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