Main classification of high pressure check valves
Release time：2019-05-20 17:15:00
Check valves can be mainly divided into swing check valves (rotating around the center of gravity) and lift check valves (moving along the axis).
Among them, internal thread check valves and butterfly check valves belong to this type of valve. It includes swing check valves and lift check valves. Swing check valves have a hinge mechanism and a valve disc that rests freely like a door on an inclined valve seat surface. To ensure that the valve disc can reach the appropriate position on the valve seat surface every time, the valve disc is designed on the hinge mechanism, so that the valve disc has sufficient swing space and can make true and comprehensive contact with the valve seat. The valve disc can be made entirely of metal, or it can be inlaid with leather, rubber, or use synthetic coverings, depending on the performance requirements. 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 valve disc of the lift check valve is seated on the sealing surface of the valve seat on the valve body. In addition to the valve disc being able to lift and lower freely, the rest of the valve acts like a globe valve. The fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back onto the valve seat and cut off the flow. Depending on the usage conditions, the valve disc can be made entirely of metal, or it can be inlaid with rubber pads or rubber rings on the valve disc frame. Like a globe valve, the passage through a lift check valve is also narrow, so the pressure drop through a lift check valve is larger than that through a swing check valve, and the flow rate of a low-temperature check valve is less restricted.
Source: Baidu Baike
Among them, internal thread check valves and butterfly check valves belong to this type of valve. It includes swing check valves and lift check valves. Swing check valves have a hinge mechanism and a valve disc that rests freely like a door on an inclined valve seat surface. To ensure that the valve disc can reach the appropriate position on the valve seat surface every time, the valve disc is designed on the hinge mechanism, so that the valve disc has sufficient swing space and can make true and comprehensive contact with the valve seat. The valve disc can be made entirely of metal, or it can be inlaid with leather, rubber, or use synthetic coverings, depending on the performance requirements. 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 valve disc of the lift check valve is seated on the sealing surface of the valve seat on the valve body. In addition to the valve disc being able to lift and lower freely, the rest of the valve acts like a globe valve. The fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back onto the valve seat and cut off the flow. Depending on the usage conditions, the valve disc can be made entirely of metal, or it can be inlaid with rubber pads or rubber rings on the valve disc frame. Like a globe valve, the passage through a lift check valve is also narrow, so the pressure drop through a lift check valve is larger than that through a swing check valve, and the flow rate of a low-temperature check valve is less restricted.
Source: Baidu Baike
