Pressure Regulators
INSTRUCTION
SHEET
M-4807/0809
PRG700 Series
INSTALLATION
The Omega Engineering Inc’s high-flow Pressure Regulator is designed for air service only. The maximum supply
pressure is 250 PSI. Clean all pipe lines thoroughly to remove dirt and scale before installation is made. Apply a
small amount of compound to the male threads only. Install regulator in air line; body is fitted with a 1/4" or
3/8” NPT for inlet and outlet connections. Regulator can be mounted in any position without affecting its
operation. Avoid undersized fittings that will limit flow through the regulator and cause pressure drop
downstream. The use of a filter to remove dirt and liquid in the air line ahead of the regulator is recommended
for best performance. If an air lubricator is used, it should be located downstream beyond the regulator in order
to avoid interference with the regulator performance.
OPERATION
The PRG700 is a high capacity regulator that provides a uniform output pressure independent of supply pressure
variations. Before putting the regulator into service for the first time, relieve pressure on the range spring by
turning the knob counterclockwise. To operate, turn the pressure adjusting knob slowly in a clockwise direction
until required downstream pressure is obtained. Turned in this direction, the range spring compresses causing
increased output pressure.
MAINTENANCE
The regulator is easily disassembled for the occasional cleaning or removal of foreign matter. Before this is done,
however, shut off valve upstream of the regulator to prevent escape of air when regulator is disassembled. There
is no need to remove the regulator from the pipe line; remove the two No. 8-32 screws on the bottom of the unit
and pull out the pintle assembly. Wash inner valve assembly with solvent exercising care to avoid damaging
diaphragms and valve facings. (Avoid such solvents as acetone, carbon tet, trichlorethlene.) Replace assembly
carefully.
The vent hole in the bonnet should be kept clean. A slight flow of air through this hole is necessary for the proper
operation of the regulator.
WARNING: These products are intended for use in industrial compressed air systems only. Do not use these
products where pressures and temperatures can exceed those listed under Specifications.
Before using these products with fluids other than air, for non-industrial applications, life-support systems,
or other applications not within published specifications, consult
Inc.
Omega Engineering
