These valves are used where a flow producing a minimum pressure drop is consistantly present in a system or in a system where the valves' full flow capacity is not required under low flow conditions.

Pilot-piston valves for general applications that are built to order include the 500 Series, 4000 Series, 5000 Series, 6000 Series, 7000 Series, 8000 Series and 12000 Series. The 35000 Series valve is a special application valve where fast response is required. The HS Series, JJ Series and 15-794 Series valves are designed for the specific purpose applications of steam, air-water-oil, and CO2 and are pre-built for these common applications.