Shand & Jurs Biogas Expanda-Seal™

Shand & Jurs Expanda-Seal™
Shand & Jurs offers a uniquely designed seal, named Expanda-Seal™, which uses tank pressure to inflate the gasket. This design actually uses the internal vessel pressure to create a tighter seal the closer the pressure gets to the set point.

Shand & Jurs 94020 Conservation Vent (Pressure/Vacuum) with Expanda-Seal™ Pallet

To reduce emissions, Shand & Jurs designed and patented a high performance valve sealing technology called Expanda-Seal™, which offers reduced tank emissions and odors for every process environment imaginable. This innovative design actually uses the internal vessel pressure to create a tighter seal the closer the pressure gets to the set point. Expanda-Seal™ ensures less than 0.5 SCFH air at 95% of the set point; the end result is a nearly bubble-tight seal.
 
When pressure inside the tank is below the set point, the deflated diaphragm rests on the seat ring in a typical manner, as with any normal valve, retaining internal pressure.
 
As the pressure approaches set point, the Expanda-Seal™, diaphragm inflates and wraps around the mating seat to achieve this unique sealing effect.
 
When the pressure in the tank is at or above set point, the valve lifts to relieve the overpressure.