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.

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 ...

Air traffic controllers in Denver lost communications with planes for 90 seconds earlier this week and had to scramble to use backup frequencies in the latest Federal Aviation Administration ...

Air traffic controllers in Denver had to scramble to use backup frequencies after their main communications lines went down for 90 seconds earlier this week in the latest Federal Aviation ...

FOX Business has confirmed that Tim Arel, Chief Operating Officer of the Federal Aviation Administration’s (FAA) Air Traffic Organization (ATO), is resigning after four decades of federal service.

FAA air traffic chief Tim Arel is stepping down amid growing safety concerns in the agency and a fatal plane crash near Washington, D.C., earlier this year.