Cashco Spring Loaded Vacuum relief Vent Model 4300

The Model 4300 end-of-line vacuum relief vent is designed for use on atmospheric and low-pressure storage tanks where vacuum relief is required.  It 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.

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

Vacuum 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 vacuum.

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,  Standard flanged bolt patterns to mate with ASME Class 150, DIN PN16, or DIN PN10 flanged connections.