On any type of refrigeration system, from small reach-in coolers all the way to large chillers, controlling the head pressure of the refrigerant is important.That’s because it helps keep the system ...

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.

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 ...

Figure 5 shows an electronic pressure control with a digital display. This electronic pressure control is a single-stage, on-off, single-pole, double-throw (spdt) output relay. Notice that the control ...