Italian Besa valve 240 series pressure range

Italian Besa valve 240 series pressure range

BESA's main product lines:

139 threaded connection safety valve

240F threaded connection safety valve

249 threaded connection safety valve

130 flange connected safety valve

240 flange connected safety valve

250 flange connected safety valve

260 flange connected safety valve

280 flange connected safety valve

290 flange connected safety valve

Italian Besa valve 240 series pressure range

Parameters of Italian BESA safety valve:

9) Opening pressure（ set pressure）.The safety valve disc is in operationInlet pressure when starting to rise under operating conditions ，Under this pressure down ，Starting to have measurable opening height ，The medium is perceivable by visual or auditory sensesContinuous emission status.

10) discharge pressure .The inlet pressure when the valve disc reaches the specified opening height .The upper limit of emission pressure must comply with relevant national regulations Requirements of standards or specifications.

11) Exceeding pressure .Difference between discharge pressure and opening pressure ，Usually expressed as a percentage of the opening pressure.

12) Return pressure .After discharge, the valve disc contacts the valve seat again ，The inlet pressure at which the opening height becomes zero.

13) Opening and closing pressure difference .Difference between opening pressure and reseating pressure ，Usually using recoil pressure and opening pressureExpressed as a percentage， Only when the opening pressure is very low, the pressure difference between the two is used to represent it.

14) Back pressure .Pressure at the outlet of the safety valve.

15) Rated discharge pressure .The upper limit of emission pressure specified by the standard.

16) Sealing test pressure .Import pressure for conducting sealing test ，Measure the leakage through the sealing surface of the closure under this pressure leak rate.

17) opening height .The actual lift of the valve disc from the closed position.

18) flow channel area .The minimum cross-sectional area of the flow channel between the inlet end of the valve disc and the sealing surface of the closing component ，Used to calculate without any resistance Theoretical displacement under influence.

19) runner diameter .Diameter corresponding to the flow channel area.

20) Curtain area .When the valve disc rises above the valve seat ，A cylinder formed between its sealing surfacesSurface or conical surface Road area.

21) Emission area .Minimum cross-sectional area of fluid channel during valve discharge .For fully open safety valves ，The emission area is equal to flow channel area； For micro opening safety valves ，The emission area is equal to the curtain area.

22) Theoretical displacement .Calculation displacement of an ideal nozzle with a cross-sectional area equal to the flow area of the safety valve.

23) discharge coefficient .The ratio of actual displacement to theoretical displacement.

24) Rated displacement coefficient .Displacement coefficient and reduction coefficient（ 取 0. 9) The product of.

25) rated displacement .It is allowed to be used as a safety valve in the actual displacementThe benchmark part.

26) Equivalent calculated displacement .pressure 、temperature 、When the medium properties and other conditions are the same as the applicable conditions for the rated displacement ，safety Calculated displacement of valve.

27) Frequency jump .The safety valve disc moves back and forth rapidly and abnormally ，in transportDuring operation, the valve disc contacts the valve seat.

28) flutter .The safety valve disc moves back and forth rapidly and abnormally ，During exerciseThe valve disc does not touch the valve seat.