Detonation Flame Arrester Detonation-proof foot valve for suction lines
- virtually maintenance-free
- check valve makes starting the pump easier
- provides protection against deflagrations and stable detonations
- useable for nearly all flammable liquids
- meets TRGS* requirements
- special strainer prevents solid particles from entering
Function and Description
The PROTEGO® EF/V-IIB3 detonation-safe foot valve protects the suction line in a storage tank. The virtually maintenancefree device is installed at the end of the emptying line within the tank. During suction, the valve opens at an approximate under-pressure of 30 mbar / 12 inch W.C. When the pump is turned off, the device functions as a check valve and prevents the line from emptying. This is very helpful when the pump is restarted.
Combustible mixtures can form in filling and drain lines of storage containers that are not always filled with product. Ignition of explosive atmospheres can lead to highly accelerated pipe deflagration or detonations. The detonation-proof foot valve prevents the combustion from being transmitted into the tank and destroying it. The design of the foot valve ensures that the strainer is always filled with residual product. Together with the special valve design, this combination prevents flame flash back from the inside out.
The application limits for the device are a product vapor/air mixture temperature of up to +60°C / 140°F and an absolute pressure up to 1.1 bar / 15.9 psi. This covers all the possible operating conditions of empty lines for flammable liquids.
The device protects against nearly all flammable liquids and is permitted for explosion group IIB3 (C MESG ≥ 0.65 mm).
Type-approved in accordance with the current ATEX Directive and EN ISO 16852, as well as other international standards.
To select the nominal size (DN), please use the flow capacity chart on the following pages
|DN||25 / 1"||32 / 1¼“||40 / 1½“||50 / 2"||65 / 2½“||80 / 3"||100 / 4"||125 / 5"||150 / 6"||200 / 8"||250 / 10"|
|a||125 / 4.92||125 / 4.92||135 / 5.31||135 / 5.31||160 / 6.29||160 / 6.29||200 / 7.87||235 / 9.25||260 / 10.24||400 / 15.75||450 / 17.72|
|b||85 / 3.35||85 / 3.35||85 / 3.35||85 / 3.35||95 / 3.74||95 / 3.74||125 / 4.92||130 / 5.12||135 / 5.31||175 / 6.89||200 / 7.87|
|c||155 / 6.10||155 / 6.10||180 / 7.09||180 / 7.09||210 / 8.27||210 / 8.27||250 / 9.84||310 / 12.20||365 / 14.37||480 / 18.90||565 / 22.24|
Material selection for housing
|Housing||Steel||Stainless Steel||Steel||Stainless Steel|
|Valve||Stainless Steel||Stainless Steel||Stainless Steel||Stainless Steel|
|Strainer||Stainless Steel||Stainless Steel||Stainless Steel||Stainless Steel|
Selection of explosion group
|MESG||Expl. Gr. (IEC / CEN)||Gas Group (NEC)|
|> 0,90 mm||IIA||D|
|≥ 0,65 mm||IIB3||C|
Specification of max. operating temperature
|≤ 60°C / 140°F||Tmaximum allowable operating temperature in °C|
Flange connection type
|EN 1092-1; Form B1|
|ASME B16.5 CL 150 F.F.|
Flow Capacity Chart
The volume flow V in m³/h was determined with water according to DIN EN 60534 at a temperature Tn = 20°C and an atmospheric pressure pn = 1,013 bar, kinematic viscosity v = 10-6 m²/s
To avoid electrostatic charge of flammable liquids the maximum flow is limited (refer to TRGS 727, CENELEC-Report CLC/TR 60079-32-1).