Model No: 121

Storagetech’s Model 121 Pressure-Vacuum Relief Valve provides protection to bulk storage tanks and vessels from over and under pressurization. The valves are mounted on the tank roof flange or a vent pipe from the vapour space.

In the closed position the pressure relief pallet and diaphragm assembly are held tightly against a seal to prevent the loss of vapour to the atmosphere. As the internal pressure in the tank increases, due to product filling and vapour development, the pressure in the tank increases, and in the event that the set pressure of the unit is reached, the diaphragm will open and discharge the gas into the atmosphere. The opening set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.), and the valve will reseal when the tank returns to a safe pressure.

The vacuum pallet and diaphragm assembly is similarly maintained in the closed position. As the internal pressure in the tank reduces, due to emptying, the balance between the tank pressure and the external atmospheric pressure changes, and when the set pressure of the unit is reached, the diaphragm opens to admit air and rebalance the internal pressure. The vacuum set-point is selectable from a range between +61 mbar and +1000 mbar (+24 inch W.C. and 400 inch W.C.). The valve will reseal when the tank returns to a safe pressure.

Several features are inherent in the valve design to ensure a smooth, positive and effective operation. The body is self-draining and drip rings prevent condensate from settling on seating surfaces. A diaphragm and seal manufactured from Teflon reduce the possibility of ice formation and sticky residues hindering the valve from opening, while the pallet assembly moves freely on guide posts.

Searching for top-tier Oil and Gas storage tank Pressure Vacuum Relief Valve solutions? Look no further! Our top-mounted, pipe-away, spring-loaded equipment sets the industry standard for safety and reliability.

From pressure vacuum relief valves to spring-loaded safety valves, we offer a comprehensive range designed to meet your needs. Experience peace of mind with our pressure/vacuum relief valve w/ pipe-away feature, ensuring efficient operation and maximum safety.

Need assistance with installation? Our spring-loaded safety valve diagram provides clear guidance for easy setup. Whether it’s vacuum relief valves for vacuum leaf filtration or pressure and vacuum relief valves for storage tanks, we have you covered. Trust in our expertise and invest in quality pressure vacuum safety valve solutions today.