The STAD equilibrium valve allows precise hydraulic control of the system and is perfect for use in heating, cooling, and hot water circulation systems. Technical data Application: Heating and cooling systems. Hot water circulation systems. Features: Equilibrium Initial setpoint Measurement Cutoff Material: The valve is made of AMETAL® alloy Seat sealing: Plug w/ EPDM O-ring Stem sealing: EPDM O-ring Hand wheel: Polyamide and TPE rubber Plain ends: Nipple: AMETAL® Sealing (DN 25-50): EPDM O-ring AMETAL® is a dezincification-resistant TA alloy. Marking: Housing: TA, PN 20/150, DN and measurements in inches. Hand wheel: Type of valve and DN.