1. The disc of the low-temperature check valve is disk-shaped and rotates around the shaft of the valve seat channel. Because the channel in the valve is in a flow line, the flow resistance is smaller than that of the ascending butterfly check valve, which is suitable for large diameter occasions where the flow rate is low and the flow does not change often, but it is not suitable for pulsating flow, and its sealing performance is not as good as the lifting type. Butterfly check valve is divided into single disc type, double disc type and half type three, these three forms are mainly divided according to the valve diameter, the purpose is to prevent the medium to stop the flow or reverse flow, weaken the hydraulic impact.

2, low temperature check valve disc slide along the valve body vertical center line check valve, internal thread check valve can only be installed on the horizontal pipe, in the high pressure small diameter check valve valve disc can be used ball. The body shape of the butterfly check valve is the same as that of the globe valve (which can be used in common with the globe valve), so its fluid resistance coefficient is larger. Its structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover are processed with a guide sleeve, and the valve disc guide can be lifted and lifted freely in the valve disc guide. When the medium flows along, the valve disc is opened by the thrust of the medium, and when the medium stops flowing, the valve disc lands on the valve seat by self-drooping to prevent the reverse flow of the medium. The direction of medium inlet and outlet channel of straight-through butterfly check valve is perpendicular to the direction of valve seat channel; Vertical lift check valve, the medium inlet and outlet channel direction is the same as the seat channel direction, the flow resistance is smaller than the straight-through type.

3, low temperature check valve: the disc around the pin in the seat rotation of the check valve. The disc check valve is simple in structure, can only be installed on the horizontal pipe, and has good sealing performance.

4. Low temperature check valve: the valve disc slides along the center line of the valve body. Pipe type check valve is a new valve, its small size, light weight, good processing technology, is one of the development direction of check valve. However, the fluid resistance coefficient is slightly larger than that of the swing check valve.

5, pressure type check valve: This valve is used as a boiler feed water and steam cut off valve, it has the comprehensive function of lifting type check valve and globe valve or Angle valve.

In addition, there are some check valves that are not suitable for pump outlet installation, such as bottom valves, spring valves, Y valves and other check valves.

Product range

1. When the medium flows in the specified direction, the valve disc is opened by the force of the medium; When the medium counterflows, because of the weight of the valve disc and the effect of the valve disc by the reverse force of the medium, the valve disc and the sealing surface of the valve seat are close to achieve the purpose of preventing the medium counterflows.

2, the sealing surface of the valve body and valve disc adopts stainless steel surfacing welding.

3, the valve structure length according to GB12221-1989 provisions, flange connection size according to JB/T79-1994 provisions.