Proportional Pressure Control

Proportion-Air electronically operated valves and regulators provide proportional pressure control of most fluids, inert gases and some hazardous media. Low pressure, high pressure and vacuum proportional pressure control devices are available.

Low Pressure Proportional Control

High Pressure Proportional Control

What is Proportional Pressure Control?

To control pressure “proportionally,” a variable electronic signal is used to provide a command to a pneumatic or hydraulic pressure control device. The electronic command signal (0-100%) is proportional to the calibrated pressure control range (0-100%).

In other words, a min-to-max electronic signal is proportionally equal to a min-to-max output pressure.

For example, the QB3H can be controlled with an electrical voltage or current signal. The QB3H shown is setup to accept a 0-10 VDC command signal which equates proportionally to an output pressure of 0-500 PSIG. In this example, a 5 VDC command will tell the QB3H to open the inlet valve and increase pressure until 250 PSIG is achieved.

QB3H Application

Laser Cutting

QB3H Specifications

QB3H Pressure Regulator

This example shows three Proportion-Air MPV pressure regulators mounted on a manifold and sharing a common supply pressure and common exhaust port. The MPV uses a “true” proportional valve and each of these are controlling a completely different pressure range with independent 4-20 mA command signals.

A 12 mA command signal (50% of span) can be applied to each MPV to achieve pressure output of 50% of each pressure range. This proportional pressure control works the same for 0%, 100% or anywhere in between.

MPV Application

Force Pressure Control

MPV Specifications

MPV Pressure Regulator