The operating pressure determines the nominal pressure of the safety valve, the operating temperature determines the operating temperature range of the safety valve, the calculated constant pressure value of the safety valve determines the constant pressure range of the spring or lever, and then determines the material of the safety valve according to the medium used
And the structure type, and then calculate the throat diameter of the safety valve according to the discharge of the safety valve.
The following are general rules for the selection of safety valves by safety valve manufacturers.
(I) Hot water boilers - generally use non-closed slightly open safety valves with wrenches.
(2) Steam boilers or steam pipelines generally use non-closed full-open safety valves with wrenches.
(3) Liquid incompressible medium such as water - generally use closed micro-opening safety valve, or use safety relief valve.
(4) High-pressure feedwater - closed full-open safety valve is generally used, such as high-pressure feedwater heater, heat exchanger, etc.
(5) Compressible media such as gas - generally use closed full-open safety valves, such as gas storage tanks, gas pipelines, etc.
(6) E-class steam boilers-generally use dead-weight safety valves.
(7) Pulse-type safety valves are generally used in large-diameter, large-displacement and Brass safety valve good quality pressure systems, such as temperature reduction and pressure reduction devices, power station boilers, etc.
(8) Built-in safety valves are generally used for train tankers, automobile tankers, and storage tanks that transport liquefied gas.
(9) The top of the oil tank is generally a hydraulic safety valve, which needs to be used in conjunction with the breathing valve.
(10) Pilot-operated safety valves are generally used for underground drainage or natural gas pipelines.
(11) A safety return valve is generally used on the liquid phase return pipeline at the outlet of the tank pump in the LPG station.