safety valve

Instruction: This valve is used for power plant boilers, pressure containers. Pressure and temperature reducing equipment and other facilities. It serves to ensure the safety of the equipment druing working. Structure briefing: 1. The main characteristics of the spring fully bore type safety valves are as belows: Stable structure, good sealing performance, accurate opening pressure, full discharge capability, low differential reseating pressure and convienient adjustment, etc. 2. Nozzle type seat: It is the laware nozzle type seat. The speed of stesm reaches the volecity of sound when passing the exit way of the seat, the sealed surface is made of hard alloy of cobalt by overlaying welding. Large discharge coefficient, fine abilities of anti friction and corrosion resistance and long durability are recognized. 3. Thermo elastic disc: the disc is of thermo dlastic structure. Taking the advantage of its minor out-of shape feat-ure when under the medium pressure, the seal ability has been raised, and the problem that pre-discharge phenomenon of the safety valve happens when the medium pressure approaching the set pressure has been overcome. The sealed surface of disc has adopt the advanced technology of laser heat hardening to increase the hardness and the ability of anti-friction and corrosion sistance. 4. Upper adjusting ring: the valve can acquire appropriate reseating pressure by adjusting the upper adjusting ring to change the flow direction of the medium discharged from the seat. 5. Lower adjusting ring: the valve can rapidly reach full bore in the discharging process by adjusting the adjusting ring. 6. Back pressure adjusting sleeve: It is an auxuliary apparatus that serves to adjust the back pressure of disc to acquire appropriate differential reseating pressure. Installation instruction 1. The safety valve shall be installed vertically and it would be better to install the valve directly upon the adaptor of container or pipe,.This inside diameter of adaptor shall be no less than that of inlet pipe of the safety valve. 2. To avoid the thermal stress that is caused by the thermal expansion of discharge pipe, the exit way of the safety valve shall be equipped with appropriate expansion joint. The inside diameter of the discharge pipe should larger than diameter of the exit way of the valve. Its length shall be as short as possible and no bent is allowed. The weight of both the discharge pipe and expansion joint shall not be applied to the safety valve, and they shall be fastened upon the construction. The distance between both centerlines of the discharge pipe and valve body shall be as short as possible. 3. The exit way of muffler shall have enough area, in order to avoid producing back pressure that would affect the discharge capability of the valva. 4. Water drainage pipes shall be installed at the ends of both the exhaust pipe and the body, the exit of the back pressure adjusting sleeve shall be equipped with short bend.