The opening pressure of the safety valve has the initial opening pressure and the full opening pressure. After the closing of the safety valve is lost, the medium pressure when the valve flap starts to rise is the initial pressure. When reached the full opening of a large number of media release pressure when the pressure is called the full opening pressure. The initial cracking pressure is usually called the relief valve opening pressure. Full opening pressure is called relief valve discharge pressure. Safety valve opening pressure is lower than the design pressure of the pressure vessel.
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