Cashco Weight Loaded pressure Vent Model 3500

The Model 3500 in-line pressure vent is designed for use on atmospheric and low-pressure storage tanks where pressure relief is required, and the relieved gas can be piped to a scrubber, incinerator or flare system. The Model 3500 is part of the Valve Concepts complete modularity concept for it to be easily converted to a vacuum only vent, a pressure/vacuum vent with pipe away and can either be direct acting or pilot operated.

Weight loaded pallets in the vent housing allow the out breathing of vapours as the tank breathes due to thermal changes and product movement into the tank to maintain the tank pressure within permissible limits to avoid damage to the tank.

Pressure setpoints are calibrated to be within +/-2% of customer requested setting across the range of available settings and exceeds API Bulletin 2521. The air-cushion seating, and self-alignment design provides tight sealing to reduce evaporation losses and the release of toxic vapours. Seat leakage rate of less than 1 SCFH of air at 75% of set point and exceeds API Bulletin 2521 for pressure.

Self-draining body and specially designed seat ring keeps condensate away from seating surfaces, preventing freezing, binding, and clogging.

Available sizes 2" (DN50) through 12" (DN300). Aluminium, Carbon steel, Stainless, *Derakane 470 and Hetron 800 body materials are available.  Standard flanged bolt patterns to mate with ASME Class 150, DIN PN16, or DIN PN10 flanged connections.

*Derakane 470 and Hetron 800 are registered trademarks of Ashland, inc.