Vent configurations for the VCI 8900 from Valve Concepts are adjustable for the precise amount of pressure or vacuum relief without disassembly of the vent. Relief pressure on the hinged Model 8930 pressure relief vent and Model 8940 pressure/vacuum relief vent can be adjusted to a pressure range < ½ psig by adding or removing both lid weights and counter-balance weights in any combination. The top guided Model 8910 pressure relief vent and Model 8920 pressure/vacuum relief vents can be adjusted from ½ to 15 psig by tightening or releasing spring pressure. All models are available with a 20-inch or 24-inch flanged base to mate with standard 150# ASME and 150# API bolting specifications.
Aaron Brantley, product engineer for Valve Concepts, Inc said: “The unique design also permits the pressure pallet assembly to be easily removed for unobstructed access to the tank for cleaning, inspection or repairs. Plus, the flange base incorporates a set of integrated lifting lugs for easier removal or installation of the entire unit. Once installed, the pressure pallet assembly provides an effective vapor-tight seal when the tank is not under emergency conditions. If the tank out-breathing requirements exceed the capability of the normal pressure relief vent, under emergency conditions, the pallet assembly lifts off the seat to relieve excess pressure, preventing damage to the tank. When the excess pressure is relieved, the pallet assembly will reseat to again provide a vapor-tight seal.”
