Model Non-Electric - Pneumatic Pressure Switches
The pneumatic pressure switch combines a pressure sensing element and a spool valve to produce a switching device with an adjustable setpoint. The assembly is non-electric, using only air or inert gas in the switch unit. The assembly consists of two components, a switch unit and a transducer unit. The switch unit contains a mechanically actuated, five ported spool valve which provides the output signals. The transducer unit senses the pressure of a wide variety of liquids or gases and transmits a mechanical movement, at the preset pressure level, to the switch unit.