Introduction - Graco 309475F Instructions-Parts List Manual

Introduction

Introduction
A fluid pressure regulator is used in air-assisted spray
systems to ensure accurate, positive control of fluid
pressure to a spray gun, dispensing valve, or atomizing
head.
A regulator installed at a circulating line take-off or pump
reduces main line pressure to maintain the desired fluid
pressure to the spray gun, dispensing valve, or atomiz-
ing head.
Models 233771, 233772, 234268 and 234269 (F
are mechanically operated back pressure regulators that
limit the supply pressure to a set value by opening an
outlet and guiding back excess material when the prede-
termined pressure has been achieved. These valves are
used in circulating systems.
Fluid Inlet
(From gun)
Fig. 1. Cutaway of Mechanical Back Pressure Regulator
6
Models 233767, 233814, 233768, 234260, 234264, and
234265 (F . 2.) are mechanically operated fluid pres-
IG
sure regulators designed primarily for use with low to
medium viscosity fluids.
Models 233760, 233769, 233770, 233813, 234259,
234266, 234270, and 234271 (F
cally operated fluid pressure regulators designed pri-
marily for use with highly viscous coatings.
. 1.)
IG
. 3.) are pneumati-
IG
Adjustment knob Adjustment knob Adjustment knob
Spring
Valve plunger
Fluid Outlet
(Return line)
TI1770A
309475F