Ross Controls 2751A4902 Pressure Control Valve

Ross Controls 2751A4902 is a 27 Series pilot-operated check valve designed for inline pneumatic circuits. The 2751A4902 corresponds to a 1/2-inch port size with NPT threads, body size 3/4 inch, and a 1/4-inch signal port, and it is the GEN I variant without trapped pressure relief. The valve offers a Cv of 4.0 and operates at 2–10 bar (30–150 psi), enabling precise one-way flow control with pilot-assisted release. It is intended for inline mounting and uses standard NPT port threads for installation. The unit weighs approximately 1.3 lb (0.6 kg). In operation, a pilot signal on the 1/4 port actuates the check mechanism, allowing the valve to open under controlled conditions and then reseal to prevent reverse flow when the pilot is not energized. This configuration suits safety-related pneumatic circuits where preventing load drift and providing controlled pilot-line relief are required. Common applications include cylinder hold-back, clamping fixtures, and automation tooling in manufacturing environments that demand reliable non-return flow with a small, remote pilot port for actuation. As part of Ross Controls' 27 Series, the 2751A4902 is optimized for compact installations with NPT port threads and a 1/4-inch pilot port, balancing compact footprint with dependable one-way control in air systems.