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/ELR type PROTEGO® valve is a highly developed pressure relief valve with excellent flow performance. It is primarily used as a device for relieving pressure in tanks, containers, and process engineering equipment. The valve offers reliable protection against overpressure and prevents excessive 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 in and a commitment to 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.
With this “full lift type” technology, valve can be set at 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 to enable the use of corrosive substance. After the overpressure is released, the valve re-seats 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, resulting in a stable operation of the valve pallet, optimized performance, and reduced product losses.
To select the nominal size (DN), use the flow capacity chart on the following page
|DN||80 / 3"||80 / 3"||100 / 4"||100 / 4"|
|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||353 / 13.90||353 / 13.90||353 / 13.90||353 / 13.90|
|b||345 / 13.58||505 / 19.88||345 / 13.58||505 / 19.88|
Material selection for housing
|Heating jacket (P / ELR-H-...)||Steel||Stainless Steel|
|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/ELR - –
Pressure valve with heating jacket
P/ELR - H
Additional special devices available upon request.
|Pressure:||+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”.