Safety valve is installed on equipment, containers or pipes, overpressure protection, when the container or pipe pressure exceeds the allowable value, the valve automatically open the discharge medium; when the pressure drops to the required value, the valve automatically shut down. Safety valve can be divided into different types of direct-acting and pilot-driven. The direct type is driven directly by the system pressure of the valve inlet, at which point it overcomes the media pressure acting under the valve flap by the mechanical load provided by the spring or weight. The Pilot is that it is pilot driven by a structure that uses a mechanism to release or apply a closing force to open or close the safety valve. Depending on the structure of the safety valve can be divided into: spring-type safety valve with a compression spring force to balance valve pressure, so that the safety valve seal. The advantage is the safety valve high sensitivity, light, the installation location is not limited, such safety valve is more commonly used. The disadvantage is that the spring compression force changes with the spring deformation, the higher the temperature, the spring insulation and heat problems exist. Lever hammer safety valve hammer force through the lever after amplification load on the valve. The advantage is that the force applied to the valve flap during valve opening and closing does not change. The disadvantage is more sensitive to vibration, back seat performance is poor. Commonly used in fixed equipment. Pulse safety valve to the main valve and auxiliary valve design together, through the role of auxiliary valve pulse driven main valve role. Commonly used in large diameter, large displacement and high pressure system. All-opening safety valve opens a large height, with the momentum of the gas medium, the valve opens to a sufficient height, the discharge of excess media. Micro-Kai safety valve opening height is not suitable for liquid medium and displacement of small occasions. Fully enclosed safety valve safety valve open the discharge medium seal, drain through the exhaust pipe, commonly used in flammable, explosive, toxic or special media occasions. Semi-closed safety valve safety valve to open the discharge, some of the media excluded from the discharge pipe, some of the media from the valve seat, stem gap into the atmosphere. When the open relief valve is open, the excretion medium is vented to the atmosphere and is suitable for non-polluting media. The pilot-operated safety valve consists of a main valve and a pilot valve. The pilot valve acts to open or close the main valve after receiving system pressure. In addition, the safety valve from the external structure, but also can be divided into a wrench and wrench, a bellows and no bellows, with heat sink and no heat sink and so on. Bellows safety valve for corrosive media or back pressure fluctuations larger occasions; with a wrench safety valve in an emergency situation, the pressure relief by manual operation; a safety valve with heat sink for temperatures greater than 300 ℃ occasions .
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