Armstrong International GP-11AG Pressure Reducing Valve

Armstrong GP-11AG Pressure Reducing Valve is a single‑stage valve from Armstrong’s GP‑11 family that reduces a higher inlet pressure to a stable downstream setpoint for steam systems, such as boiler feed lines and distribution circuits. Targeted for steam service, the GP‑11 series is specified for downstream pressures from 20 to 250 PSIG and temperatures up to 450°F, aligning with common boiler and process plant requirements, and can be configured with an integral mount pilot option in the GP‑11 line. The GP‑11 family includes variants like the GP‑11S carbon steel body version, illustrating the rugged materials offered for steam service, while installation guidelines emphasize proper orientation (main diaphragm housing down), isolation valves on both sides, and a bypass so service can be performed without shutting the system down; a 1/4" side tapping for the control pipe and a recommending upstream strainer are part of typical configurations to minimize dirt fouling and ensure accurate regulation. Documentation from Armstrong’s installation and maintenance bulletins outlines typical single‑stage reductions, flow direction, and routine maintenance for the GP‑11, reinforcing its role as a dependable downstream pressure control solution in commercial and industrial steam applications.