Pressure- and vacuum-relief valves minimize fugitive losses
Pentair Valves & Controls
The Anderson Greenwood 4000 Series pressure- and vacuum-relief valves (photo) are compliant with the latest (7th Ed.) of the API 2000 standard, which covers normal and emergency vapor-venting requirements for bulk-liquid storage tanks. These valves are engineered to open fully at 10% overpressure, helping to protect tanks from physical damage caused by internal pressure fluctuations. As a result, the valves can be set more closely to a storage tank’s maximum allowable working pressure (MAWP) or maximum allowable working vacuum (MAWV), allowing users to fill and empty tanks more quickly and operate at higher pressures, says the company. The 4000 Series valves remain closed longer, resulting in increased productivity and reduced evaporation and fugitive emissions loss. The valve range is available in weight- or spring-loaded designs. It comes in sizes ranging from 2 to 12 in. A variety of coatings are available to provide enhanced protection from extreme temperatures and exposure to corrosive media. — Pentair Valves & Controls, Minneapolis, Minn.