Product details:

The Zurn Wilkins P4000A Thermal Expansion Relief Valve will relieve excess pressure in Fire Protection Systems, protecting fire distribution networks from high pressure buildup. The P4000A is an adjustable direct acting pressure relief valve which senses upstream pressure. Once the upstream pressure descends below the set pressure, the P4000A will close drip tight within close limits. The valve is designed for use in systems where thermal expansion, pumps or elevated plumbing could cause destructive pressure rise.