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Structural installation: 1. The valve of the flange check valve is a disc and rotates around the rotating shaft of the seat channel. Because the inner channel of the valve is streamlined, the flow resistance is smaller than the butterfly check valve, which is suitable for large caliber occasions with low flow rate and variable flow, but it should not be used for pulsatile flow, and its sealing performance is not as good as the Ball Check Valve. Butterfly check valve is divided into single valve, double valve and polyvalve three, these three forms are mainly divided by the diameter of the valve, the purpose is to prevent the medium to stop flowing or backflow, weaken the hydraulic impact.
2. Flange check valve: the check valve with the valve disc sliding along the vertical centerline of the valve body. The butterfly check valve can only be installed on the horizontal pipe, and the valve disc can be used on the high-pressure small-diameter check valve. The valve body of the butterfly check valve is the same in shape as the stop valve (in common with the stop valve), so its fluid resistance coefficient is large. The structure is similar to the stop valve, the body and valve are the same as the stop valve. The upper part of the valve flap and the lower part of the valve cover processing guide sleeve simple, the valve flap guide simple can be freely lifted in the valve flap guide simple, when the medium is along the current, the valve disc opens by the thrust of the medium, when the medium stops the flow, the valve disc falls on the valve seat, to prevent the reverse flow of the medium. The inlet and outlet channel of the direct through butterfly check valve is perpendicular to the valve seat channel; the vertical lift check valve has the same direction as the valve seat channel, and the flow resistance is smaller than that of the straight through channel.
3. Disc check valve: a check valve that rotates around the pin shaft in the valve seat. The disc check valve structure is simple, can only be installed on the horizontal pipe, poor sealing.
4. Pipe check valve: the valve valve sliding along the centerline of the valve body. Pipe type check valve is a new kind of valve, its small volume, light weight, good processing technology, is one of the development direction of check valve. However, the fluid resistance coefficient is slightly larger than the Swing Check Valve.
5. Compression check valve: this valve is used as a boiler feed water and steam cut-off valve, which has the comprehensive function of lifting and Ball Check Valve and Plastic Globe Valve or corner valve.
In addition, there are some check valves not suitable for pump outlet installation, such as PVC Foot Valve, spring type, Y type of check valves.
Principles and structure of action: 1. When the medium flows in the specified direction, the valve disc is opened by the reverse force of the disc, when the valve disc weight of the disc and the sealing surface of the valve disc and the valve seat are closed to prevent the reverse flow of the medium.
2. The sealing surface of the valve body and the valve flap shall be overwelded with stainless steel. 3. The structure length of the valve is specified in GB12221-1989, and the flange connection size is specified in JB / T79-1994.
Storage and installation:
1. Both ends of the valve access shall be blocked in a dry and ventilated room. If long-term storage, should be frequently checked against corrosion.
2. The valve shall be cleaned before installation and eliminate the defects caused during transportation.
3. During installation, carefully check whether the signs and nameplate on the valve meet the use requirements.
4. The valve is installed on the horizontal pipe, with the bonnet facing up.
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