Vacuum relief valve - D 13 N | KITO Armaturen

KITO D13N Vacuum Relief Valve

The KITO VS/oG-… type D13N is a self-actuated vacuum relief valve designed for end-of-line installation on tank vent nozzles. The valve opens when the tank vacuum exceeds the setpoint, allowing air ingress to prevent unacceptable negative pressure in the tank shell. This model is not explosion-proof and must not be used with flammable media.

Typical Applications

• Water tanks, auxiliary liquids, and non-flammable chemical storage.
• Process vessels emptied by pump.
• Installations where cooling or vapor condensation may generate vacuum conditions.
• Vent lines requiring vacuum protection without flame arrestor functionality.

Dimensions and Operating Ranges

Available in DN 50 to DN 300. Flanged connections: DN 50–150 to PN 16, DN 200–300 to PN 10. Optional ASME B16.5 Class 150 RF connection. Vacuum setpoint range: 2–60 mbar.

Construction Materials

Standard body: cast steel 1.0619, cover: carbon steel. Optional: stainless steel 1.4408 or aluminium (DN 100–300). Seat: stainless steel 1.4571. Gasket: PTFE.

Disc and Sealing Variants

Selection depends on vacuum setpoint:

• 2 to <3.5 mbar: aluminium disc, FEP & HD3822 seal.
• ≥3.5 to 14 mbar: stainless steel 1.4571 disc, FEP & HD3822 seal.

• 14 to 60 mbar: stainless steel 1.4571 disc, PTFE seal.

Sizing and Flow Data

Flow curves are based on air at 1.29 kg/m³. Stated flow rates are achieved with 20% accumulation above setpoint. For lower permissible accumulation, flow correction is required.

FAQ

Is an actuator required?
No. Operation is mechanical via differential pressure.

CE marking available?
No. Technical documentation states no EC certificate and no CE marking.