Profile: D/A Mfg. Co., Inc. offers a complete line of instrument valves and manifolds, which includes differential pressure valve manifolds, pressure transmitter & gauge valve manifolds, multi-port gauge valves and block valves. Our Dial-A-Function® automatically positions and sequences the valves to protect the transmitter from damage and the plant from inaccurate measurement control. We offer Safti-Fold® valves help protect the plant, process, operator & environment from process blowout, uncontrollable leakage and non-operation.