The safety valve is to reduce the system pressure by discharging the medium outside the system to prevent the damage of the medium high pressure system inside the system. Thus, the safe operation of the equipment is protected.
Several important parameters of safety valve selection:
1. Opening pressure (rated pressure). The inlet pressure at which the valve disc begins to rise under operating conditions, at which a measurable opening height begins, and the medium is in a state of continuous discharge by visual or auditory branches.
2, return to the seat pressure. After discharge, the valve disc re-contacts the seat, that is, the inlet pressure when the opening height becomes zero.
3. Discharge pressure. The inlet pressure when the disc reaches the specified opening height. The upper limit of discharge pressure shall comply with the requirements of relevant national standards or regulations.
4. Back pressure value. Pressure at the outlet of the safety valve.
5, rated displacement coefficient. The product of the displacement factor and the reduction factor (0.9).
6. Open height. The actual lift of the disc from the closed position.
Common models:
Steam A48Y with wrench spring full open safety valve, thread thread A21Y spring micro open external thread safety valve, etc.
Special reminder: where the purchase of safety valves must be corrected to the local boiler equipment factory to use.
