Anderson Greenwood (AGCO) M25, M251 Block and Bleed Instrument Gauge Valves

The Anderson Greenwood M25 block and bleed valve is a compact, low-weight solution that securely combines isolating, calibrating, and venting facilities into a single unit. Equipped with a dedicated 1/4″ FNPT vent port, the AGCO M25 enables pressure gauges, transmitters, and switches to be serviced reliably while safely exhausting hazardous fluids or gases.

The M25’s metal-seated bonnet assembly uses a rotating stem with a free swivel ball-type seat suited to both gas and liquid service. For extreme environments, the M251 incorporates a strengthened stem and bonnet with a larger T-bar handle for 10,000 psig service, and a high-temperature bonnet assembly with adjustable graphite rings and back-up pressure rings ensures a leak-free stem seal.

As an authorized distributor, BriceBarclay stocks a deep inventory of both the M25 and M251 series in 316 Stainless Steel to keep your power, water, and oil & gas operations running smoothly without the wait.

Mounting a pressure transmitter instead of a gauge? Anderson Greenwood also builds this valve set as a dedicated 2-valve manifold with front-vent, bottom-vent, and 2-bolt flanged patterns — see the M25, M25A and M25B two-valve instrument manifolds, available by quote.