Female vent couplings for LNG tank pressure release

These female quick disconnect vent valves, also known as 'FQDV", are located on the dispensers at LNG re-fuelling stations and interlock easily with the male counterpart for fast and easy connecting and disconnecting of fuelling lines.

product image of a female qdv valve

Product description

These types of valves provide a cost-effective benefit where fuel lines are connected and disconnected more than once per week.

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Housing: Stainless steel 316L
Seal retainer: Stainless steel 303
Seal ASSY: TFE/Viton
Seal: TFE
Poppet: Stainless steel 303
Seal poppet: PCTFE
Spring: Stainless steel 301/302

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Gas types: LNG (Liquefied Natural Gas)
Connections: Thread
Type: 45˚ SAE (CGA440)
Internal pressure (during fueling): Max. 20.7 bar (300 psi)
System pressure (static): Max. 38 bar (550 psi)
Fill breakaway: 189.27 lpm (50 gpm)
Vent breakaway: 37.8 lpm (10 gpm)
Temperature range: -212˚C to +65˚C (-350˚F to +150˚F) 
Sizes and range: 5/8"
Series available: LNG specific, VFL series
Standards: ATEX, CE, ISO 12617, ISO 16924

*Materials and specifications are subject to generalisation. Our experienced people are ready to help you find the correct fit for your application. 

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  • 100% pressure tested
  • Handles LNG vent gas and liquid 
  • Dust cap provided
  • Durable and economical

Did you know?

There are over 100,000 FQDV's in service worldwide

FQDV's vary in handle type and stem length to meet preferential requirements or spatial limitations

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Whether you already know what you need, or you would like the opinion of an expert, we are always ready to help you out.