Main Safety Valve

Series

GA49H-4 DN25

Note:Types and Specifications of Safety devices need to be calculated and selected according to the specific working conditions of the protected equipments and systems before quotations. 

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Use

This valve is used for power plant boilers, pressure containers, pressure and temperature reducing device a nd other facilities. It serves to prevent the pressure exceeding the highest allowable pressure value and ensure the safety of the device when working.

Structure briefing

1 .When the medium pressure rises to the set pressure, the implse safety valve opens, and the medium in the impulse pipe eners in to the pis ton chamber of the main safety valve from impulse pipe, forcing the piston to descend, and the valve automatically opens; when the impulse safety valve closes, the disc will also automatically close.

2.The sealed surface is made of Fe base stainless steel by over-laying welding. Through thermal treatment, the wear resistance and anti-erosion of disc is improved.

Installation instruction

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 gal low to prevent he force of its weight directly applying on the main safety valve. The connecting lange between the main safety valve and exhaust pipe shall eliminate anyextra stress.

4.At the lowest point of the exhaust pipe, water drainage shall he taken into consideration to avoid producing water hammer whil discharging steam.

Main External Dimensions