Pressure Relief Valve
- 10% technology for minimum pressure increase up to full lift
- extreme tightness, resulting in lowest possible product losses and reduced environmental pollution
- set pressure close to opening pressure for optimum pressure maintenance in the system
- high flow capacity
- valve pallet is guided inside the housing to protect against harsh weather conditions
- can be used in explosion hazardous areas
- automatic condensate drain
Function and Description
The P/EL type PROTEGO® valve is a highly developed pressure relief valve. It is primarily used as a device for relieving pressure in tanks, containers and process engineering equipment. The valve protect against unallowable overpressure and prevents the unacceptable loss of product vapors close to the set pressure.
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 of the tank and still safely vent the required mass flow.
Due to our highly developed manufacturing technology the tank pressure is maintained up to 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 pallets from sticking when sticky products are used, and they enable the use of corrosive media. After the excess pressure is discharged, 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.
To 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||≤ +80 mbar||> +80 mbar||≤ +80 mbar||> +80 mbar|
|Set pressure||≤ +32.1 inch W.C.||> +32.1 inch W.C.||≤ +32.1 inch W.C.||> +32.1 inch W.C.|
|a||218 / 8.58||218 / 8.58||218 / 8.58||218 / 8.58|
|b||287 / 11.30||452 / 17.80||289 / 11.38||454 / 17.87|
Material selection for housing
|Heating jacket |
(P / EL-H-...)
|Valve seat||Stainless Steel||Stainless Steel|
|Weather hood||Steel||Stainless Steel|
|Protective mesh screen||Stainless Steel||Stainless Steel|
Material selection for pressure valve pallet
|Pressure range [mbar]|
|+3,5 up to +5,0|
+1.4 up to +2.0
|>+5,0 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|
Flange connection type
|EN 1092-1; Form B1|
|ASME B16.5 CL 150 R.F.|
Design Types and Specifications
The valve pallet is weight-loaded. At set pressures greater than 80 mbar (32.1 inch W.C.), an elongated construction is used.
There are two different designs:
Pressure valve in basic design
P/EL - –
Pressure valve with heating jacket
P/EL - H
Additional special devices available upon request.
|+3.5 mbar||+210 mbar|
|+1.4 inch W.C.||+84 inch W.C.|
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). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.