Power movement and the displacement characteristics of pneumatic - valve pressure relief devices

Power movement and the displacement characteristics of pneumatic - valve pressure relief devices 1 > pneumatic - valve setting pressure power station under the condition of the running start let rev booking 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. 2 > over pressure exceeds the pressure of the power plant pneumatic - valve setting pressure increment, normally expressed as the percentage of setting pressure. 3 > after pneumatic - valve to discharge the disc back pressure power station to contact with the seat, which highly to zero pressure. 4 > open-close differential pressure setting pressure with back pressure difference, a percentage of the setting pressure or expressed in pressure units. 5 > discharge pressure setting pressure and over pressure. 6 > the rated discharge pressure limit, on the standard or specification of the prescribed discharge pressure is the measurement of a pressure relief devices row Chi import static pressure. 7 > back pressure due to pressure exists in the discharge system in the static pressure caused by the pressure relief devices to export. 8 > emissions back pressure power pneumatic control valve because the medium flows through the pressure relief devices in discharge system in the device of pressure at the exit. 9 > additional back pressure stress release so devices exist at its outlet pressure, before the action is caused by other stressors in the discharge system. 10 > cold test differential pressure power pneumatic control valve on the test bench to begin to let qi import Zheng pressure, the pressure contains to the back pressure and/or operating conditions such as temperature correction. 11 > seal test pressure in testing the sealing import static pressure, under the pressure measured by closing a sealing surface leakage rate. 12 > burst pressure when glass blasting device, its import Zheng pressure, the provisions of glass blasting device of 13 glass blasting pressure blasting glass equipment import static pressure, the increased under the specified temperature blasting design in the pressure blasting. 14 > broken broken pressure gas pin into, the bent pin Yin or shear pin Yin gesture, the static pressure of imports. 15 > a pressure loading pressure release ð « • selections imports 16 > secondary pressure in power between the actual cutting emissions of pneumatic control valve and the export of 17 > pass into the pressure existing in the discharge pressure before a lower than plant import static pressure of pneumatic control valve setting pressure. Under the pressure of the relief valve closing occur between a sealing surface can be release by auditory or visual perception of the medium, but no no displacement can be measured. Before discharge pressure relief valve is only applicable to compressible medium. 18 > theoretical displacement minimum cross-sectional area is equal to its flow path relief valve port area or closed pressure release so the device is equal to the weight of the net flow surface definite ideal nozzle calculation of displacement, expressed as a unit of weight or volume unit. 19 > measured displacement measurement under the rated discharge pressure of the pressure relief devices displacement, expressed as a unit of weight or let definite unit. Spend in 20 > nominal displacement measured by applicable specifications or standards allow that which is used as a pressure relief devices application reference. 21 > 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 pressure relief devices of meter Bi rehearsals 22 > displacement coefficient is the ratio of the measured displacement with the theory of displacement. 23 > rated capacity coefficient of rated capacity with the theory of the ratio of the displacement. 24 > jump frequency power pneumatic control valve disc movement back and forth unusually fast. Contact with movement of the valve seat valve. 25 > flutter power pneumatic control valve disc movement back and forth unusually fast. The movement of the valve fail to contact with the seat. 26 > benchmark status by applicable standards or by the experiment of the agreement between the parties medium condition, can be used to light uniform displacement test results.