Pneumatic switch butterfly valve (also known as pneumatic cut-off butterfly valve) is generally used to cut off the medium in two positions in the industrial pipeline. It uses the air source pressure to drive the disc plate to do full open or full open action. Pneumatic switch butterfly valve can be generally divided into normally open type or normally closed type according to the action form, that is, the valve is open or closed when it is not working, and it can automatically reset to the open or closed state when there is no air source, power failure or gas path fault. The opening and closing speed of pneumatic cut-off butterfly valve is very fast, especially suitable for quick switch or emergency cut-off occasions.
Pneumatic switch butterfly valve (clamp type) pneumatic switch butterfly valve (flange type)
Application of pneumatic switch butterfly valve:
Pneumatic switch butterfly valve can be divided into flange type and clip type according to the connection mode. It can be divided into metal seal and soft seal according to different sealing materials. It can be used in different media, different temperatures and different working conditions. It has the advantages of strong adaptability, good sealing performance and convenient installation. Pneumatic cut-off butterfly valve can be widely used in steam, gas, environmental protection, petroleum, chemical, sewage and other industrial pipelines for remote centralized control or local control.
Advantages of pneumatic switch butterfly valve:
1. The pneumatic cut-off butterfly valve has the advantages of simple structure, easy installation and disassembly, convenient maintenance and wide application range.
2. Two way sealing function, can be installed in any direction, installation is not affected by the medium flow direction and space position.
3. The pneumatic cut-off butterfly valve only needs to rotate the disc plate 90 degrees to complete the switch action, which has the advantages of small operation torque, labor saving and fast switching speed.
4. The single acting actuator can effectively prevent the automatic spring return to close or open the valve when the air source is cut off or the pipeline fails.
5. The pneumatic cut-off butterfly valve receives the switch signal of the control system to accurately control the valve switch, so as to achieve the tight cut-off of the medium in the pipeline.
Standard Specification for pneumatic switch butterfly valve:
Design standard: GB / t2238-1989
Flange connection size: GB / t9113.1-2000; GB / t9115.1-2000
Structural length: GB / t12221-1989
Pressure test: GB / t13927-2000; JB / t9092-1999
Applicable media: air, water, sewage, steam, gas, oil, etc
Strength test: 0.91.52.43.75
Sealing test: 0.661.11.762.75
Low pressure air tightness test: 0.5 ~ 0.7
Applicable temperature: soft seal: - 29 ℃ ~ 180 ℃; hard seal: - 40 ℃ ~ 600 ℃
Pneumatic switch butterfly valve (flange type) pneumatic switch type butterfly valve (clamp type)