Threaded excess flow valves for LPG surge protection

Excess flow valves are safety devices that check flow lines and protect against surges in which case they shut-off the flow. They are installed in flow lines and are designed specifically for pressure gauges, pipelines and tank nozzles.

Product description

Excess flow valves are spring actuated if a flow rate exceeds a predefined expected rate. The valves allow flow in both directions with the spring functionality only being in effect in the direction defined on the valve body. The valves will re-open once pressure equalisation has been achieved on either side of the valves, which the bleed-off can assist in reaching.

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Body: Stainless steel, carbon steel
Spring: Stainless steel
Guide: Carbon steel, stainless steel
Poppet: Stainless steel

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Gas types: LPG (Propane, Butane)
Connections: Thread
Types: NPT
Working pressure: Up to 27.5 bar (400 psi)
Max. pressure: Up to 131 bar (1900 psi)
Closing flow rate (liquid Propane): 3.5 to 1892.7 lpm (0.95 to 500 gpm) 
Closing flow rate (vapour Propane): 1.7 to 2520.2 SCMH (60 to 89,000 SCFH)
Temperature range: -45˚C to +148˚C (-50˚F to +300˚F)
Sizes and ranges: ½" to 4" 
Series available: 1519C, 1519A, 1519B, A1519, 3272, 3282, 3292, A3272, A3282, A3292, 7574, 12472, 3272H, A7537, A7539, A8523, A8525, A2137, 2139, A3500, A4500 , 2723C, A8013D, 2884D, 3199W, model 40, model 41, model 141, model 301, model 185
Standards: UL listed, CE-PED

*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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  • Precision machined
  • Low pressure drop = minimised cavitation in pump suction lines
  • Cotter pin preventing loss of spring retainer
  • Consistent closing flow by stainless steel spring
  • Long service life
  • Separate models for installation in half or full coupling

Did you know?

Every excess flow valve has a bypass feature not exceeding a #60 drill, which allows a small amount of product to pass downstream of the seat disc

The valve will automatically reset itself as the pressure will pass through the bypass area to reach the downstream side, which is then increased to match the pressure on the upstream side

NOTE: A threaded type, designed to be installed in a threaded flange, is available from 2" to 8" 

Alternative products

  • A flanged excess flow valve

    Excess flow valves (flanged)

    Normally open and bi-directional, these valves will shut the flow if the rate of flow exceeds an expected rate, until the pressure is close to equalised.

    See our flanged excess flow valves

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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.