Open the relief valve disc height can be divided into micro enlightening the safety valve and the safety valve, raise safety valve opening stroke height is: 0 or less. 05年d0 ( Minimum discharge throat diameter) ; All safety valve opening height is 0 or less. 25 d0 ( Minimum discharge throat diameter) 。 Safety valve is a safety valve, the opening and closing pieces under the action of external force in a normally closed state, when the equipment or piping within the medium pressure, e. automatically when open, more than by discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed value. Relief valve belong to automatic valve class, the relief valve is mainly used in boilers, pressure vessels and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. The relief valve, the form of the structure is divided into vertical hammer, lever, spring type and leading type ( Impulse type) ; According to the body structure, can be divided into two kinds of, closed and not closed. Enclosed the relief valve is not leaked out medium, all along the discharge to the designated location, commonly used in toxic and corrosive medium. For with air and steam safety valve, use no more closed valve. For the selection of valve products, should according to the actual seal pressure to determine. For spring safety Industrial Valves, in a nominal pressure ( PN） Has several work stress level within the range of the spring, when placing order, in addition to indicate the relief valve model, name, medium and temperature, it should indicate the body sealing pressure, or else the maximum sealing pressure supply. The relief valve installation and maintenance should be paid attention to the following items: all kinds of safety valve should be installed vertically. The relief valve outlet should be without resistance, avoid to produce compression phenomenon. Safety valve before installation should be specially test and check its official seal. The relief valve should be of use in regular inspection.
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