Function and Principle of Safety Valve
Classification:
Release Time：2017-09-25
The safety valve is a protective device for boilers, pressure vessels and other pressure equipment, which is used to prevent the pressure in the pressure equipment from exceeding the design allowable value, so as to protect the safety of the equipment and its operators. Because the safety valve can not rely on any external energy and action, it is often used as the last protection device of pressure equipment. In this sense, its role cannot be replaced by other protective devices. When the pressure of the medium in the pressure equipment is greater than some reason and the abnormal rise, to reach the preset value, the safety valve automatically opens, and then a large number of emissions, in order to prevent the pressure continues to rise. When the medium pressure is at normal working pressure,
The safety valve is a protective device for boilers, pressure vessels and other pressure equipment, which is used to prevent the pressure in the pressure equipment from exceeding the design allowable value, so as to protect the safety of the equipment and its operators.
Because the safety valve can not rely on any external energy and action, it is often used as the last protection device of pressure equipment.
In this sense, its role cannot be replaced by other protective devices.
When the pressure of the medium in the pressure equipment is greater than some reason and the abnormal rise, to reach the preset value, the safety valve automatically opens, and then a large number of emissions, in order to prevent the pressure continues to rise. When the medium pressure is at normal working pressure, the valve remains closed and sealed.
When the protected equipment (I. e., at the inlet of the safety valve) medium is at normal working pressure, the elastic load is greater than the static pressure of the medium on the valve disc, so that the valve is closed. The difference between the two forces to produce the valve and valve seat sealing surface between the force of mutual compression is the sealing force. As long as the sealing force is large enough, it can prevent the medium from leaking out, so that the valve can achieve the necessary sealing. If the medium pressure increases, more than the normal working pressure, the sealing force will be reduced. Small to a certain extent, the medium began to flow out. If the medium pressure is further increased, when the medium force on the valve flap with the spring force to balance, the valve flap began to rise from the valve seat, known as "open". When the valve continues to rise, it reaches the designed opening height and discharges the full amount. As long as the displacement of the valve is large enough, the pressure in the equipment will decrease. When the pressure drops to a certain level,ValveRe-closing due to spring force.
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