Deflagration and endurance burning proof pressure relief valve - C 7.1 N | KITO Armaturen

KITO DS/KS-IIB1 Pressure Relief Valve, Type C 7.1 N

The KITO DS/KS-IIB1 is a pressure relief valve designed for tank venting lines, incorporating an end-of-line flame arrester element. It is intended for flammable liquids and vapors in explosion group IIB1, and, following additional assessment/approval, for alcohols with MESG ≥ 0.85 mm and a maximum operating temperature of 60°C.

Typical Applications

Commonly installed on tank roofs at vent outlets to protect against overpressure and to limit vapor losses via controlled pressure settings. For full tank breathing operation, it is typically paired with a vacuum relief valve.

Applications include:

• solvent, alcohol, and flammable liquid storage tanks,
• chemical and petrochemical facilities,
• tank venting systems requiring deflagration protection,
• locations requiring endurance against sustained burning.

Dimensions and Set Pressure Ranges

Available in DN 25 to DN 100. Connections per EN 1092-1 type B1, with optional ASME B16.5 Class 150 RF. Standard pressure classes: DN 25 PN 40, DN 50–100 PN 16.

Indicative set pressure ranges:

• DN 25: 3.1–200 mbar
• DN 50: 2–200 mbar
• DN 80: 2–200 mbar
• DN 100: 2–200 mbar

Flow rates are calculated for air with 40% accumulation above set pressure, per DIN 4119. For lower permissible overpressure, flow correction is required.

Materials and Sealing Options

Standard construction:

• body in carbon steel or optional stainless steel 1.4571,
• seat and spindle in 1.4571,
• fully replaceable flame arrester element,
• NBR sealing, with Viton, PTFE, EPDM, or metal sealing options.

For set pressures ≥100 mbar, only PTFE or metal sealing is permitted.

Selection and Operation Logic

This is a weight-loaded valve, requiring no actuator. Selection is based on explosion group, set pressure, permissible tank overpressure, venting flow, body material, and seal compatibility with stored media.

Certifications

Type examination certificate per EN ISO 16852 and CE marking in accordance with ATEX 2014/34/EU.