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GA49H-4   DN25 Instruction This valve is used for power plant boilers, pressure containers,pressure  and  temperature reducing  device  and other  facilitie.  It serves  to prevent  the pressure  exceeding  the highest  allowable pressure value and ensure the safety of the device when working. Structure briefing 1. The pressure of the disc is balanced through the lever and heavy hammer and the valve is ensured seal by moving the postiton of heavy hammer and changing the weight of heavy hammer to reach the required set pressure  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. 3. At the top of valve is equipped an electromagnet to open and another to close the valve. The actions of the mechanism and the electric appliance are separate and will not affect each other. Installation instruction   1.  This valve  shalll  be used  with  main safety  valve A49H-4 together. 2. Impulse sefety 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 pip eline shall be washed clean before installing imp- ulse 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 feat that the validity of the meter and the impulse safety valve may be affected by the steam releasing process of the main safety valve.