Pressure reducing and surplussing valves

Spirax Sarco pressure reducing and surplussing valves are used on steam, compressed air, gas and industrial liquid systems when the application needs stable local pressure control either downstream of the valve or upstream of the valve. Pressure reducing valves lower pressure at the point of use so each process can run at its preferred condition, which can reduce downstream equipment cost, limit flash steam losses and give operators more flexibility across changing plant duties. Surplussing or back pressure valves hold a minimum upstream pressure or relieve excess upstream pressure where process stability depends on maintaining pressure before the valve rather than after it. On saturated steam systems, pressure reduction also changes steam temperature, so stable valve performance supports repeatable thermal control as well as pressure control. A complete pressure control station usually includes more than the valve alone. Separators, strainers, isolating valves, gauges and safety valves all help protect the station and support reliable commissioning, maintenance and downstream equipment protection. The wider range includes self-acting, pilot-operated, direct-acting, stainless steel and actuated solutions, making it easier to match compact point-of-use duties, sanitary applications and more demanding process conditions without forcing one regulator style into every role.