Three different hydraulic-over-air relay valve designs are available: single, dual, and tandem.The valves accommodate 150-psi maximum air pressure and 2,000-psi maximum hydraulic pressure.

Unless the suction pressure requires readjustment, the only reduction in compression ratio (ratio of absolute discharge pressure/absolute suction pressure) will come from lowering the head pressure.

The line provides a high level of regulation accuracy and repeatability. Rather than range springs, the regulators and relays use a stainless-steel capsule as a sensing device. Its multistage ...