Profile: Proportion-Air, Inc. is a manufacturer of electronic air pressure regulators and air flow control valves. Our products include pressure reducing regulators, pressure control valves, flow monitor, flow control valve, custom capabilities, pressure sensors, ultrasonic sensors, potentiometers, regulators, panel meters, and power supplies. The FCV is a proportional flow control valve that consists of an electronic pneumatic positioner, a pneumatic valve actuator, an LVDT position sensor to continuously monitor the valve position, and a parabolic shaped linear valve trim. The pressure reducing regulators include volume boosters, air relays, vacuum regulators, and pneumatic relays. The panel meters include digital display, LCD display, and maximum power requirement.