Products > Holders & Accessories > Excess Flow Valves (EFV)     Print this product datasheet
 
 
Excess Flow Valves are designed for use with double disc or disc and relief valve combinations. Manufactured throughout in Stainless Steel, Elfab offer the Excess Flow Valve in ¼" or ½" connection and pressure gauge options.
 
  • Essential protection
  • Robust stainless steel construction
  • Rapid shut off
Nominal Bore A B Inlet Connection Outlet Connection
1/4" 203 142.5 1/4" NPT Male 1/4" NPT Female
1/2" 228 153.5 1/2" NPT Male 1/2" NPT Female

Bursting discs are pressure differential devices, therefore it is essential to prevent pressure build-up in the interspace between relief devices. The space between the bursting disc and the safety valve shall be provided with a means for preventing unacceptable build up in pressure, as specified in EN ISO 4126-6:2003 section 5.4.2.c. Elfab’s Excess Flow Valve provides this essential facility. The Excess Flow Valve remains open under very low flow rates, possibly caused by temperature changes of interspace gas, and closes when exposed to high flow rate, as occurs when a bursting disc functions.


Pressure Intelligence

 The data shown on these sheets represents the standard offering from Elfab. Depending upon the requirements of your application, Elfab maybe able to provide a solution based on this product but outside the standard operating parameters. In addition, Elfab produces an extensive range of alternative products which maybe more suitable for your requirements.

As a result of extensive testing, Elfab can advise on these choices, or on other technical matters, such as discharge requirements, temperature testing, material selection and corrosion resistance, customised designs and burst detection.

To discuss your specific product or service requirements please contact your Elfab representative.

© 2004 Elfab Ltd.

 
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