Pentair's Anderson Greenwood 4000 Series of pressure and vacuum relief valves are verified to meet the seventh edition of the API 2000 standard, which covers normal and emergency vapor venting requirements for bulk liquid storage tanks. The valves provide increased flow capacities and will open at 10% overpressure. This allows them to be set more closely to a storage tank's maximum allowable working pressure or maximum allowable working vacuum. The range is available in weight or spring-loaded designs and comes in 2–12-in. sizes. The valves are available in a variety of coatings, including polytetrafluoroethylene (PTFE) and ethylene chlorotrifluoroethylene (ECTFE).
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