What is the difference between Gas heating Boiler Safety Valve and pressure limiting Valve
What is the difference between Gas heating Boiler Safety Valve and pressure limiting Valve
The safety valve of gas heating boiler can be divided into vertical hammer type, lever type, spring type and pilot type (pulse type) according to the structure form, and it can be divided into closed type and unclosed type according to the structure of valve body. Closed safety valves, that is, the excluded media do not leak, all along the exit to the designated place, generally used in toxic and corrosive media. For air and steam safety valves, most of the use of unclosed safety valves. The selection of safety valve products should be determined according to the actual sealing pressure. For spring safety valves, there are several kinds of working pressure grade springs in a nominal pressure (PN) range, except for safety valves when ordering In addition to model, name, medium and temperature, the sealing pressure of valve body should be indicated, otherwise it should be supplied according to the maximum sealing pressure.
The installation and maintenance of gas heating boiler safety valve should pay attention to the following matters:
All kinds of safety valves should be installed vertically.
There should be no resistance at the exit of the safety valve to avoid pressure.
The safety valve should be specially tested and checked for official sealing before installation.
Safety valves in use should be inspected regularly.
The pressure limiting valve includes a handle, a heavy hammer, an air plug and an exhaust pipe, on which an air cavity and a vent hole connected with the air cavity are arranged, the upper end of the exhaust pipe is located in the gas cavity, and an elastic device is arranged in the air cavity of the heavy hammer, The elastic device is stuck on the outer wall of the exhaust pipe, the air plug connects the heavy hammer and the handle together, the front end part is located at the upper end opening of the exhaust pipe, an air blocking device is arranged above the vent hole, and a protruding device is arranged on the exhaust pipe. The utility model has the advantages that the gas blocking device is arranged above the vent hole, which can effectively prevent the high temperature and high pressure steam scalding hands discharged from the air drain hole to the outside when the pressure limiting valve is artificially lifted. The protruding platform or positioning ring is set on the trachea, especially when the handle is lifted artificially, the spring can be stuck on the raised platform or the positioning ring will not fall, so that the operation of artificial venting is more safe and reliable.
