Ross Controls 1968A5107 is a 19 Series check valve designed to prevent backflow in pneumatic circuits while maintaining pilot and control-line pressure. It is specified for a 3/4" port size with NPT threads (body size 3/4") and carries a flow coefficient (CV) of 8.6, with a weight of 0.9 lb. For BSPP (G) threads, the prefix D applies (for example, D1968A5107) per Ross Controls’ model-number conventions. Typical applications include pilot-supply isolation in directional-control valve circuits and vertical cylinder load-holding, where the valve prevents backflow or gravity-induced drift in the cap-end supply.
