Pressure Safety Valve

Written by Jerry Ratzlaff. Posted in Valve

A pressure safety valve is also known as a pressure relief valve and is used to protect vessels and tanks from overpressure. It is designed to protect critical system components such as pressure vessels, tanks and flange ratings.

Abbreviations

  • PSV - pressure safety valve
  • PRV - pressure relief valve

PSV Orifice Designation

The effective discharge area is the area that the fluid passes through when the valve is relieving. It is dependent on various properties of the fluid & process including temperature, relieving pressure, flow rate and compressibility.

 

 Size (in2)Size (mm2)
D 0.110 70.97
E 0.196 126.5
F 0.307 198.1
G 0.503 324.5
H 0.785 506.5
J 1.1287 830.3
K 1.838 1,186
L 2.853 1,841
M 3.60 2,323
N 4.34 2,800
P 6.38 4,116
Q 11.05 7,129
R 16.0 10,323
T 26.0 16,774