Main Safety Valve

The main safety valve is an important safety device, mainly composed of a valve seat, a valve disc (spool), and a loading mechanism. It is suitable for use in power plant boilers, pressure vessels, power plant turbines, temperature and pressure reduction devices, and other pressurized equipment to prevent the internal pressure of the equipment from exceeding the maximum allowable pressure value, thereby ensuring the safe operation of the equipment. Generally, main safety valves are used in conjunction with impulse safety valves on power plant steam turbines and other pipelines. When the pipeline pressure exceeds the allowable value, the impulse safety valve opens first, and the main valve opens accordingly; When the pressure drops to a safe value, the impulse closes and the main safety valve synchronously closes, providing safety protection for the pipeline and turbine. The applicable temperature of this valve is ≤ 425 ℃. The main safety valve needs to be installed and fastened on the support, which bears the recoil force generated when the main safety valve exhausts steam. The exhaust pipe should have a dedicated hanger, and the weight of the exhaust pipe should not be added to the main safety valve. The connecting flange between the main safety valve and the exhaust pipe should eliminate any additional prestress. The lowest point of the exhaust pipe should consider drainage to avoid water hammer during exhaust.