So far, in the oil, chemical, natural gas, power, metallurgy, as long as, construction, water supply and other industries will use safety valve. Thus, the safety valve is widely used, however, before this, we must first understand the safety valve can be better used. Below, a brief introduction about the safety valve. Safety valves are important safety accessories on boilers, pressure vessels and other pressurized equipment. The reliability and performance of safety valves are directly related to the safety of equipment and users. At present, the mass production of safety valves are mostly spring and lever two categories. Spring-loaded safety valve is divided into closed and non-closed, generally flammable, explosive or toxic media should be used closed, steam or inert gas can choose not closed. Lever-type safety valve in the selection, if the temperature is better to choose the safety valve with a radiator. Master safety valve selection skills is also very necessary. Usually by the operating pressure of the safety valve to determine the nominal pressure from the operating temperature to determine the temperature range of the safety valve from the calculated value of the pressure relief valve to determine the fixed pressure range of the spring or lever, and then according to the appropriate media to determine the material safety valve And structure type, and then calculated according to safety valve relief valve throat diameter. General use of hot water boiler is not closed with a wrench micro-type safety valve. Steam boiler or steam pipe is generally not closed with a wrench full safety valve. Water and other incompressible liquid medium with closed-type micro-valve safety valve, high-pressure water supply with a general closed-type safety valve, gas and other compressive media are generally used with a closed full-safety valve. Large-caliber, large displacement and high pressure system with pulse safety valve. Transportation of liquefied gas train tanker, truck tanker, storage tanks and other general-purpose built-in safety valve. The top of the tank with hydraulic safety valve, to be used in conjunction with the safety law. Underground drainage or natural gas pipeline with pilot-operated safety valve. Liquefied petroleum gas station tank pump outlet liquid return pipe with a general safety valve. Negative pressure or operating system may produce negative pressure vacuum relief valve is generally used. Fluctuations in back pressure and toxic flammable containers or piping systems generally used bellows safety valve. The lower the freezing point of the media system commonly used insulation jacket safety valve. When the safety valve fails, the troubleshooting method is also very familiar with. First, we must first distinguish the safety valve what kind of fault occurred. The second is based on different failures to use different methods of elimination. The most common faults are: disc does not come back to the seat after the release, leakage, to the specified pressure does not open, the pressure continues to rise after the exhaust valve flap frequency or vibration, less than the required pressure to open. After discharge, the valve does not return to the seat, which is mainly bent by the spring. The position of the valve disc is not correct or is stuck, and the valve should be reassembled. When there is leakage problem, this may be caused by the valve seat Dirt, you can use the lift wrench to open the valve a few times, rushed to the dirt, if the sealing surface damage, should be based on the degree of injury, grinding or turning grinding method to repair, stem bending, tilting or lever and fulcrum Deviation caused by the spool and valve dislocation, should be reassembled or replaced; to the specified pressure does not open more because of the constant pressure is not allowed, should be re-adjusted the amount of spring compression or hammer position; encountered exhaust pressure Continue to rise, should re-select the appropriate safety valve, if the flap can not be opened to the proper height or the exhaust pipe cut enough, you should reassemble the valve stem or replace the spring or to comply with the safety of exhaust area exhaust pipe ; Valve flap or vibration is mainly due to the spring stiffness is too large, you should use the appropriate stiffness of the spring, if it is due to improper adjustment of the adjustment ring back seat pressure is too high, the adjustment ring should be re-adjusted Set, due to excessive discharge pipe resistance caused by excessive discharge back pressure, the discharge pipe resistance should be reduced; less than the prescribed pressure is not allowed to open when the pressure is fixed or spring aging elastic decline should be properly tightened to adjust Screw or replacement spring. In the process of identifying the safety valve, only the concept of safety valve first familiar to distinguish the safety valve used, so that failure will find a suitable method, which means that this series of processes is like a link, the lack of . Above, is the application of safety valve some of the necessary knowledge.
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