This valve is used for power plant boilers, pressure cintainers, pressure and temperature reducing device and other faciltties. It serves prevent the pressure exceeding the highest allowed pressure value and ensure the satefy of te device when working.
1. When the medium pressure rises to the set pressure, the implse safety valve opens, and the medium in the impulse pipe enters into the piston chamber of the main safety valve from impluse pipe, forcing the piston to descend and then the valve antomatically opens; when the impulse safety valve closes, the disc will also automatically close.
2. The sealed surface is made of Fe base srainless steel by over-laying welding, Through thermal treatment, the wear resustance and antierosion of dics is improved.
1. The main safety valve shall be installed vertically at the highest position of the deivce.
2. The main safety valve shall be fastened upon the gallow, which sustains the back-seat force produced in the steam discharging process of the main safety valve.
3. The exhaust pipe shall contain a special gallow to prevent the force of its weight directly applying on the main safety valve. The connecting lange between the main safety valve and exhaust pipe shall eliminate any extra stress.
4. At the lowest point of the exhaust pipe, water drainage shall be taken into consideration to avoid producing water hammer while discharging steam.
Main safety valve. need to install with impulse safety valve