VD/SV-HRL

Function and Description

The atmospheric deflagration and endurance burning-proof VD/SV-HRL type PROTEGO^® valve is a highly developed combined pressure/vacuum relief valve for high flow capacities with an integrated flame arrester. It is primarily used as a device for flame transmission proof in-breathing and out-breathing on tanks, containers, and process equipment. The valve offers reliable protection against overpressure and vacuum, prevents the in-breathing of air and product losses almost up to the set pressure, and protects against atmospheric eflagration and endurance burning if stabilized burning occurs. The PROTEGO^® flame arrester unit is designed to achieve minimum pressure drop with maximum safety. The PROTEGO^® VD/SV-HRL device is available for substances of explosion group IIA (NEC group D MESG > 0.9 mm).

When the set pressure is reached, the valve starts to open and reaches full lift within 10% overpressure. This unique 10% technology enables a set pressure that is only 10% below the maximum allowable working pressure (MAWP) or maximum allowable working vacuum (MAWV) of the tank. After years of development, this typical opening characteristic of a safety relief valve is now also available for the low pressure range.

The tank pressure is maintained up to the set pressure with a tightness that is above The normal standards due to our tate-of-the-art manufacturing technology. This feature is ensured by valve seats made of high quality stainless steel and with individually 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 them from sticking when sticky substances are used and to enable the use of corrosive fluids. After the overpressure s released, the valve re-seats and provides a tight seal.

If the set pressure is exceeded, explosive gas/product vapor/air mixtures are released into the atmosphere. If this mixture ignites, the integrated PROTEGO^® flame arrester unit (3) revents flame transmission into the tank. If additional mixture continues to flow and stabilized occurs, the integrated flame arrester prevents flashback as a result of endurance burning. The valve is protected and also fulfils its function under thesesevere conditions. The spring-loaded weather hood opens as soon as the melting element (4) melts. The valve can be used at an operating temperature of up to +60°C /140°F and meets he requirements of European tank design standard EN 14015 (Appendix L) and ISO 28300 (API 2000).

Type-approved in accordance with the current ATEX Directive and EN ISO 16852, as well as other international standards.