Pressure Vacuum Valve Calculations

NORMAL (OPERATING VALVE) CALCULATIONS

Select appropriate equations to calculate outbreathing (pressure relief) and inbreathing (vacuum) requirements for your application.
ie six different equations shown depending on pump in / out flow rates GPM or BPH and Product Flash Pt / Boiling Pt.
Pressure Relief Requirements Outbreathing
 1
Flash Point >100F, Boiling Point > 300F
GPM
Pump In
Required Flow
 x
8.57
 +
 =
 2
Flash Point >100F, Boiling Point > 300F
BPH
Pump In
Thermal Req
Required Flow
 x
6.00
 +
 =
 3
Flash Point < 100F, Boiling Point < 300F
GPM
Pump In
Thermal Req
Required Flow
 x
17.14
 +
 =
 4
Flash Point below 100F, Boiling Point below 300F
BPH
Pump In
Thermal Req
Required Flow
 x
12.00
 +
 =
Vacuum Relief Requirements  Inbreathing
Flash Point or Boiling Point Not a factor!
 5
GPM
Pump Out
Thermal Req
Required Flow
 x
8.00
 +
 =
 6
BPH
Pump Out
Thermal Req
Required Flow
 x
5.60
 +
 =