GA49H-4.0 DN25 Impulse Safety Valve

The GA49H-4.0 impulse safety valve is used on power plant boilers, pressure vessels, pressure- and temperature-reducing units, and similar equipment. It helps prevent system pressure from exceeding the maximum allowable value and supports safe equipment operation.

1. This valve is designed to operate in conjunction with the A49H-40 main safety valve. The force acting on the valve disc is balanced by the lever and counterweight to maintain sealing. The required opening pressure is established by adjusting the position and/or mass of the counterweight.

2. Install the impulse safety valve vertically and keep the lever level. Maintain equal clearance between the lever and both sides of the guide fork.

3. Purge the pipeline before installing the impulse safety valve.

4. Maintain sufficient separation between the lead line of the impulse safety valve and the inlet pipe of the main safety valve. The distance between the electric-contact pressure gauge and the inlet pipe of the main safety valve shall be at least five times the inlet-pipe diameter. This separation helps prevent steam discharged from the main safety valve from affecting the accuracy of the pressure gauge and the operation of the impulse safety valve.