1 direct load safety valve: a only by direct mechanical loading device such as a heavy hammer, lever aggravating hammer or spring to overcome force produced by the disc under medium pressure relief valve.

2 motivating auxiliary device of the relief valve: the valve using a power aided device, can open when pressure is lower than the normal setting.

3 added with load of the relief valve: the valve in the inlet pressure to always keep before setting pressure has an additional force used to enhance the seal. The additional force ( Supplementary load) Can be provided by the external energy, and the relief valve inlet pressure reach setting pressure should be released in a reliable way. The size of the added load should set such a way that assumes that the load is not released, it in the inlet pressure relief valve setting pressure exceeds national rules and regulations under the premise of achieve the rated capacity of a percentage.

4 pilot operated relief valve: from pilot valve to rule out a rely on media to drive or control of the main valve of the valve. The pilot valve itself for direct load safety valve.

5 vacuum relief valve: a container designed to complement the fluid to prevent excessive vacuum relief valve, after the recovery of the normal again shut down and prevent continue to flow into the medium. Many different kinds of the types of safety valve relief valve, according to the structure form, can be divided into the following types:

port area: the inlet valve is to shut down the smallest cross-sectional area of flow channel between a sealing surface, used to calculate the flow without any resistance influence theory.

port diameter: corresponds to the diameter of the port area.

open height: disc leave actual itinerary in the closed position.

setting pressure of safety valve under the condition of the running start opening due to pressure, under the pressure, under specified operating conditions produced by medium pressure makes the force open valve with the disc in a seat on the force balance each other.

over pressure: more than pressure relief valve setting pressure increment, normally expressed as the percentage of setting pressure.

back pressure: relief valve discharge disc and seat again after contact, the opening to zero pressure.

opening and closing the differential: setting pressure and back pressure difference, a percentage of the setting pressure or pressure unit said. Discharge pressure: setting pressure and over pressure.

the rated discharge pressure: the upper limit standard or specification of the prescribed discharge pressure, is the import of the static measurement of a pressure relief devices displacement pressure.

back pressure: due to the emissions system pressure and the pressure of pressure relief devices to produce at the exit.

emissions back pressure: due to the medium flows through the pressure relief devices into the discharge system in the device of pressure at the exit.

additional back pressure: pressure relief devices exist at its outlet pressure, before the action is caused by other stressors in the discharge system.

the theory of displacement: minimum cross-sectional area is equal to its flow path relief valve port area or closed pressure relief devices is equal to the weight of the net flow of nozzle area is an ideal displacement calculation, expressed as a mass flow rate or volumetric flow rate.

the rated capacity: the measured displacement of the applicable specifications or standards allow that which is used as a pressure relief devices application reference.

equivalent calculation of displacement, pressure, temperature or medium, such as conditions of use and the application of the rated discharge conditions are not at the same time, the calculation of pressure relief devices emissions.

the rated discharge coefficient, the rated capacity with the theory of the ratio of the displacement.

frequency jump: unusually rapid movement back and forth the relief valve disc and disc contact seat in the movement.

flutter: the relief valve disc unusually rapid movement, back and forth movement of the disc does not contact the seat.

the purpose of the safety Industrial Valves relief valve can prevent pipeline of the pressure equipment, containers and other medium pressure exceeds allowable values, to ensure that equipment and personal safety.

can choose according to conditions of use safety valve type, as shown in table 2 4.

parameter range of the relief valve are as follows: nominal size DN10 ~ 400; Nominal pressure PN6 ~ 420; Working temperature t≤ 610℃。

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