LISHUI TOPARTS VALVE CO.,LTD.

Check valve

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Main materials: carbon steel, stainless steel, alloy steel and dual-phase steel


Design implementation standards: API 6D, API 608, API 607, BS5351, GB/T12237


Scope of application: It is generally suitable for clean media, but not for media containing solid particles and high viscosity.


Working temperature: -45℃-150℃


Connection form: SW


Pressure: 150-2500 lbs


Size: 0.5"-32 "


Details

Check valves can also be used to supply auxiliary systems whose pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis). Check valve The function of this type of valve is to allow the medium to flow in one direction only, and to prevent the opposite direction. Usually, this kind of valve works automatically, and the valve flap opens under the pressure of fluid flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-overlapping disc of the disc act on the valve seat, thus cutting off the flow. Check valves belong to this type of valves, including swing check valves and lift check valves. The swing check valve has a hinge mechanism, and a flap like a door freely rests on the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface every time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swing space and makes the valve flap contact with the valve seat truly and comprehensively. The disc can be made of metal, or inlaid with leather, rubber or synthetic covering, depending on the requirements of service performance. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The disc of the lifting check valve is located on the sealing surface of the valve seat on the valve body. This valve is like a cut-off valve, except that the disc can rise and fall freely. The fluid pressure makes the disc lift from the sealing surface of the valve seat, and the medium backflow causes the disc to fall back to the valve seat and cut off the flow. According to the service conditions, the disc can be of all-metal structure, or it can be inlaid with rubber pads or rubber rings on the disc holder. Like the globe valve, the passage of fluid through the lifting check valve is narrow, so the pressure drop through the lifting check valve is larger than that of the swing check valve, and the flow of the swing check valve is rarely restricted.