Cash Valve Type D53 Control Valves
A pressure operated diaphragm type control valve designed to control the flow of a fluid or air by an independent pressure applied to the valve diaphragm.  Cash Valve Series FR, Back Pressure Valves
Diaphragm actuated valves designed for either continuous or intermittent operation which provide accurate, repetitive pressure controlCash Valve Back Pressure Valves, K Series
High capacity angle bypass regulators or back pressure control valves with models for pressures to 1500 psig (103.4 barg) and capacities to 200 gallons per minute (757 l/min.)

 Cash Valve Type G-4, Pressure Regulators
A self-actuating pilot operated pressure reducing valve handling air, gas and steam and accurate to within ½% up to 3" and 1% for sizes to 6"