Use：

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

Installation instructions：

1.This valve shall work with A49H-40 main safety valve. Its working principle goes like this：the pressure of the disc is balanced through the lever and weight to ensure the valve's seal, and the required starting pressure can be reached by means of changing the weight's position and weight. 2.The impulse safety valve shall be installed vertically and the lever shall be kept level. The clearance from the lever to both sides of guide fork shall be even. 3.The pipelines shall be purged before installing the impulse safety valve.4.A long distance between the leading pipe of the impulse safety valve and the inlet pipe of the main safety valve shall be kept. And the distance between the electric contact pressure meter and the inlet pipe of the main safety valve shall be no less than 5 times of the diameter of the inlet pipe ,for fear that accuracy of the meter and the impulse safety valve may be affected by the steam releasing process of the main safety valve.