Pressure control valves and temperature control valves let you regulate pressure and temperature in a variety of applications. Air release/air vacuum valves incorporate an air release valve and an air vacuum valve into a compact unit. For use in hydronic heating systems, boiler feed valves can maintain water pressure by filling boilers and piping systems with water. Mixing valves are designed for mixing cold and hot water in hot water supply systems. Choose a pressure-reducing control valve that automatically reduces a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of varying flow rates. Single use rupture discs can provide rapid pressure relief to protect equipment or a system. Self-operated, direct-acting regulators can control temperature of water, steam, or other liquid systems without electricity. Grainger has a selection of temperature control valves and pressure regulator control valves that can meet many of your requirements.