The working principle of the bellows safety valve and the ordinary safety valve is basically the same, it is to increase the bellows between the valve seat and the valve body. It is used as an overpressure protection device on equipment or pipelines with unstable back pressure or toxic and corrosive media. The bellows eliminates the effect of back pressure fluctuations on the performance of the safety valve. It also protects springs and other internal parts from corrosion by the medium and effectively prevents leakage of the medium.
Bellows safety valves also have the following features:
(1) Valve seat and valve body are separable, easy to maintain and economical.
(2) The umbrella recoil plate can effectively increase the lift force, and the valve flap can be quickly opened under a relatively small pressure to discharge the medium, thereby achieving the purpose of protecting the equipment.
(3) The adjustment ring can adjust the satisfactory opening and closing pressure difference.
(4) Reasonable selection of the material of the recoil plate and the guide sleeve, the valve stem and the adjusting screw, and the proper selection of the gap, to ensure the flapper movement is flexible.
(5) Valve discs, seat seals face the welding of hard alloys, after surface lapping to ensure high sealing and service life.
(6) The bellows in the bellows safety valve can eliminate the influence of the back pressure fluctuation on the valve performance, and can protect the spring and other internal parts from the corrosion of the medium.
(7) Selection and processing of springs and bellows are rigorously tested and inspected.
Bellows safety valve is suitable for equipment and pipelines of air, steam, petroleum gas and other medium with working temperature ≤300°C as overpressure protection device. When the pressure in the equipment and pipeline exceeds the allowable value, the valve opens automatically and then discharges in full; when the pressure is reduced to the specified value, the valve is automatically closed to ensure the safe operation of the equipment. Is widely used in electric power, metallurgy, petroleum, chemical and other industries, but the bellows safety valve is not suitable for use on the reciprocating compressor, because the pressure fluctuation of the process fluid before and after the compressor is too large, and the bellows is more sensitive to such fatigue stress, Therefore, the service life of the safety valve will be greatly reduced.
Bellows safety valves also have the following features:
(1) Valve seat and valve body are separable, easy to maintain and economical.
(2) The umbrella recoil plate can effectively increase the lift force, and the valve flap can be quickly opened under a relatively small pressure to discharge the medium, thereby achieving the purpose of protecting the equipment.
(3) The adjustment ring can adjust the satisfactory opening and closing pressure difference.
(4) Reasonable selection of the material of the recoil plate and the guide sleeve, the valve stem and the adjusting screw, and the proper selection of the gap, to ensure the flapper movement is flexible.
(5) Valve discs, seat seals face the welding of hard alloys, after surface lapping to ensure high sealing and service life.
(6) The bellows in the bellows safety valve can eliminate the influence of the back pressure fluctuation on the valve performance, and can protect the spring and other internal parts from the corrosion of the medium.
(7) Selection and processing of springs and bellows are rigorously tested and inspected.
Bellows safety valve is suitable for equipment and pipelines of air, steam, petroleum gas and other medium with working temperature ≤300°C as overpressure protection device. When the pressure in the equipment and pipeline exceeds the allowable value, the valve opens automatically and then discharges in full; when the pressure is reduced to the specified value, the valve is automatically closed to ensure the safe operation of the equipment. Is widely used in electric power, metallurgy, petroleum, chemical and other industries, but the bellows safety valve is not suitable for use on the reciprocating compressor, because the pressure fluctuation of the process fluid before and after the compressor is too large, and the bellows is more sensitive to such fatigue stress, Therefore, the service life of the safety valve will be greatly reduced.
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