Gauge, Purge, & Transducer Valves Description Hansen’s specially designed Gauge, Purge, and Transducer Valves feature tough, forged steel bodies, compact size, and polished stainless steel stems HGV1: Long Neck H9490: Transducer Valve H7771 H7772 H958C H7778. More Products Refrigeration temperature sensors Temperature sensors Check Valves Hand Expansion Valves Piston, connecting rod and safety head Request a quote