EN331 Ball Valve with Spring Return Lever - AK Valves Ltd

EN331 Ball Valve with Spring Return Lever

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These deadman valves are designed to be held open and to spring close when released (self closing).  Suitable for service stations, trucks, public areas, gardens. The same features are also useful in industrial applications, where a valve must not be left open unattended.

Available in sizes 1/4" to 2", these valves are also Gas Approved to EN331.

Body is manufactured from hot forged sand blasted, external nickel plated brass body and cap sealed with Loctite® or equivalent thread sealant, using the finest brass according to EN 12165 and EN 12164 (formerly DIN 17660 and UNI 5705-65) specifications.
The Stem is blowout-proof and made from nickel plated brass, with two FPM O-rings at the stem for maximum safety.
The Sealing is pure PTFE self-lubricating seats with flexible-lip design.
The threaded ends are to EN 10226-1, ISO 228 parallel female by female.



These valves are manufactured in Italy by Bonomi Industries, also know as RuB Valves.

  • 24h 100% seal test guaranteed
  • Dual sealing system allows valve to be operated in either direction making installation easier
  • No metal-to-metal moving parts
  • No maintenance ever required
  • Handle clearly shows ball position
  • Silicone-free lubricant on all seals
  • Travel stops on body to avoid stresses at stem
  • Chrome plated brass ball for longer life with rinse hole

Working pressure & temperature

  • 40 Bar (600 PSI) non-shock cold working pressure. (5 bar Gas)
  • -40°C (-40°F) / +170°C (+350°F) (0°C to +60°C Gas)
  • WARNING: freezing of the fluid in the installation may severely damage the valve

Approved by or in compliance with

  • GOST-R (Russia)
  • Hygiene and epidemic center in Moscow city (Russia)
  • RoHS Compliant (EU)
  • According to 2014/68/UE module A: it cannot be used with dangerous gases in sizes larger than 25 mm.

NOTE: approvals apply to specific configurations/sizes only.


Download the datasheet here for the S 84 Spring Return Ball Valve

The EN331 Ball Valve with Spring Return Lever is far and away, one of our most popular items. People can't seem to get enough of it.

Inventory Last Updated: Mar 02, 2021

Customer Reviews

Based on 1 review
Good fitting valve

Ideal for my purposes after I've reduced the power of the spring. I'm using steam at 120lbs/q inch. I need to put minimum effort into operating the valve