Pressure and Vacuum Relief Valve
Function and Description
The PV/EL type PROTEGO® valve is a highly developed combined pressure and vacuum relief valve. It is primarily used as a safety device for relieving pressure and vacuum in tanks, containers and process engineering equipment. The valve offers reliable protection against overpressure and excessive vacuum. It prevents also the impermissible loss of product vapors close to the set pressure as well as the intake of air on the vacuum side close to set vacuum.
The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. Continuous investments into research and development have allowed PROTEGO® to develop a low pressure valve which has the same opening characteristic as a high pressure safety relief valve. This “full lift type” technology allows the valve to be set just 10% below the maximum allowable working pressure or vacuum (MAWP or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic is the same for presssure and vacuum relief.
Due to the highly developed manufacturing technology, the tank pressure is maintained up to the set pressure, with a tightness that is far superior to the conventional standard. This feature is achieved by valve seats made of high quality stainless steel and with precisely lapped valve pallets (1) or with an air cushion seal (2) in conjunction with high quality FEP diaphragm. The valve pallets are also available with a PTFE seal to prevent the valve pallet from sticking when sticky products are used, and they enable the use of corrosive media. After the excess pressure is discharged or the vacuum is compensated, the valve reseats and provides a tight seal.
The optimized fluid dynamic design of the valve body and valve pallet is a result of many years of research work, which allow a stable operation of the valve pallet and optimized performance resulting in reduction of product losses.
Features and Advantages
- “full lift type” technology valve utilizes only 10% overpressure to reach full lift
- extreme tightness and hence least possible product losses and reduced environmental pollution
- the set pressure is close to the opening pressure which results in best possible pressure management of the system
- high flow capacity
- the valve pallet is guided within the housing to protect against freezing in cold weather
- can be used in areas subject to an explosion hazard
- self-actuated condensate drain
- special design with lifting gear can be purchased
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Dimensions
DimensionsTo select the nominal size (DN), use the flow capacity chart on the following page
DN 50 / 2" 50 / 2" 80 / 3" 80 / 3" Set pressure ≤ +60 mbar > +60 mbar ≤ +60 mbar > +60 mbar Set pressure ≤ +24.1 inch W.C. > +24.1 inch W.C. ≤ +24.1 inch W.C. > +24.1 inch W.C. a 308 / 12.13 443 / 17.44 308 / 12.13 443 / 17.44 b 108 / 4.25 108 / 4.25 108 / 4.25 108 / 4.25 c 165 / 6.50 165 / 6.50 167 / 6.57 167 / 6.57 d 218 / 8.58 218 / 8.58 218 / 8.58 218 / 8.58 Dimensions in mm / inches Dimensions for pressure/ vacuum relief valve with heating jacket upon request
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Material selection for housing
Design B C Housing Steel Stainless Steel Heating jacket (PV / EL-H-...) Steel Stainless Steel Valve seat Stainless Steel Stainless Steel Weather hood Steel Stainless Steel Protective mesh screen Stainless Steel Stainless Steel Special materials upon request
Material selection for pressure valve pallet
Design A B C D Pressure range [mbar]
[inch W.C.]+2.0 up to +3.5
+0.8 up to +1.4
>+3.5 up to +14
>+1.4 up to +5.6
>+14 up to +210
>+5.6 up to +84
>+14 up to +210
>+5.6 up to +84
Valve pallet Aluminium Stainless Steel Stainless Steel Stainless Steel Sealing FEP FEP Metal to Metal PTFE Special material as well as higher set pressure upon request
Material selection for vacuum valve pallet
Design A B C D Pressure range [mbar]
[inch W.C.]-3.5 up to -5.0
-1.4 up to -2.0<5.0 up to -14
<-2.0 up to -5.6<-14 up to -35
<-5.6 up to -14<-14 up to -35
<-5.6 up to -14Valve pallet Aluminium Stainless Steel Stainless Steel Stainless Steel Sealing FEP FEP Metal to Metal PTFE Special material as well as higher set vacuum upon request
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Flange connection type
EN 1092-1; Form B1 ASME B16.5; 150 lbs RFSF other types upon request
Design Types and Specifications
The valve pallets are weight-loaded. At set pressures greate than 60 mbar (24.1 inch W.C.), an elongated construction is used.
There are two different designs:Pressure/vacuum relief valve in basic design PV/EL - –
Pressure/vacuum relief valve with heating jacket PV/EL - H
Additional special devices available upon request.
Any combination of vacuum and pressure levels can be set for the valve. When the difference between the pressure and vacuum exceeds 150 mbar / 60.2 inch W.C., special valve pallets are used.Settings
Pressure:
+2.0 mbar +210 mbar ; +0.8 inch W.C. +84 inch W.C. Vacuum:
-14 mbar -35 mbar -5.6 inch W.C. -14 inch W.C. Vacuum:
-3.5 mbar -14 mbar -1.4 inch W.C. -5.6 inch W.C. for presssure up to max. + 150 mbar / 60.2 inch W.C.
Higher and lower settings upon requestDetail X
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Flow Capacity Chart
The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.
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