Emergency pressure relief valve
Function and Description
The PROTEGO® Type ER-V-LP valve is a sophisticated pressure relief valve for applications in which a high flow effi ciency is of the essence. It is primarily used as an emergency pressure relief valve on storage tanks, vessels, silos, and process engineering equipment; it offers reliable protection against excessive overpressure and prevents excessive product loss at pressures as high as close to the set-to-operate pressure. It is designed to relieve particularly large quantities to prevent the vessel rupturing in an emergency case.
The valve will start to open as soon as the set-to-operate pressure is reached and only requires a 10% pressure increase or opening pressure differential until full lift. Dedicated R & D investments have enabled PROTEGO® to develop a new valve pallet technology for which a patent has been granted. This patented valve pallet technology allows the area characteristic typical of safety valves to be also applied to lower-pressure applications, while ensuring that minimum leakagerate requirements are met.
Adopting this new patented valve pallet technology permits the valve to be set to just 10% below the maximum allowable working pressure of the tank and still vent the required mass flow.
Due to the sophisticated manufacturing technology, the tank pressure is maintained up to the set-to-operate pressure, with seal-tight requirements far above common standards being met. Once the excess pressure is relieved, the valve reseats and seals tight again.
Features and Advantages
- patented valve pallet technology guarantees that minimum leakage-rate requirements can be met and, hence, least possible product losses and reduced impact on the environment are ensured
- 10% Technology for minimum pressure increase until full lift
- set-to-operate pressure close to the opening pressure; hence, best possible pressure management of the system
- high flow efficiency
- valve pallet is guided within a closed system and, thus, protected from atmospheric influence
- suited for use in hazardous areas
- rugged body design
- movable components are secured
- best technology for API tanks
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Dimensions
To select the nominal size (DN), use the flow capacity chart on the following page
DN 200 / 8" 250 / 10" 300 / 12" 350 / 14" 400 / 16" 450 / 18" 500 / 20" 600 / 24" 700 / 28" a 343 / 13.50 406 / 15.98 483 / 19.02 533 / 20.98 597 / 23.50 635 / 25.00 699 / 27.52 813 / 32.01 837 / 32.95 b 378 / 14.88 399 / 15.71 409 / 16.10 440 / 17.32 455 / 17.91 464 / 18.27 481 / 18.94 556 / 21.89 571 / 22.48 Dimensions in mm / inches
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Material selection
Design A B Housing Steel Stainless Steel Valve seat Stainless Steel Stainless Steel Valve pallet Stainless Steel Stainless Steel Sealing Stainless Steel Stainless Steel Special materials 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 pallet is weight-loaded. Higher set-to-operate pressures are achieved with Types ER/V and ER/VH (lever-operated) valves or Type ER/V-F (spring-loaded) valves.
Pressure valve in basic design ER-V-LP
Additional special devices available upon request.
Settings
+3.4 mbar +15 mbar +1.4 inch W.C. +6 inch W.C. For higher pressure settings, see types ER/V, ER/VH and ER/V-F.
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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”.
