GA49H main safety valve is mainly used in power plant boilers, pressure vessels, and temperature and pressure reduction devices to prevent pressure from exceeding the maximum allowable pressure value and ensure safe operation of equipment. The main structural features of the GA49H main safety valve produced by Shanghai First Ring Road include: 1. When the medium pressure rises to the set pressure, the impulse safety valve opens, and the medium enters the piston chamber of the GA49H main safety valve from the pulse tube, pushing the piston to descend and causing the valve to automatically open. When the impulse valve closes, the valve disc automatically closes. 2. The sealing surface is welded with cobalt based chromium nickel stainless steel, and the valve disc is heat-treated to improve the wear resistance and erosion resistance of the valve.
Installation instructions
1. The main safety valve must be installed vertically at the highest position of the equipment.
2. The main safety valve is fastened on the support, which bears the recoil force generated when the main safety valve exhausts steam.
3. 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.
4. The lowest point of the exhaust pipe should consider drainage to avoid water hammer during exhaust.