The Federal Aviation Administration has ordered airlines to test cabin altitude pressure switches in all Boeing 737s, saying some operators have reported that both switches on several aircraft had ...

Herion 33D pressure switches typically last 100 million cycles, according to the manufacturer. The IP65-rated devices can be used in pneumatic and hydraulic systems and work from vacuum to 10,000 psi.

Low-pressure controls are a common accessory added to many refrigeration systems. They are normally used to electrically cycle a compressor on and off; however, when and why they do so will vary based ...