Introduction; Back Pressure Regulators; Fluid Pressure Regulators - Graco P20-VM Instructions Manual

Introduction

A fluid pressure regulator is used in air spray systems to
ensure accurate, positive control of fluid pressure to an
air spray gun or to a low pressure 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 air spray gun or to a low pressure
dispensing valve or atomizing head.

Back Pressure Regulators

Models 233810, 233811, 233812, 233950, 234255,
234257, 234258, 233758, 234261, and 234262, are
back pressure regulators that limit the supply pressure
to a set value by opening an outlet and guiding back
excess material when the predetermined pressure has
been achieved. These valves are used in circulating
systems. Model 233810 pneumatic back pressure
regulator is shown in F
IG
Fluid Inlet
(from gun)
Fig. 1. Cutaway of Pneumatic Back Pressure Regulator
309474U
. 1.

Fluid Pressure Regulators

Models 233757, 233759, 233774, 234263, 234267,
234273, and 17L324 (F
IG
operated fluid pressure regulators designed primarily for
use with low to medium viscosity fluids.
Models 233773, 233809, 234256, and 234272 (F
are pneumatically operated fluid pressure regulators
designed primarily for use with highly viscous coatings.
Air inlet
Piston
Diaphragm
Valve plunger
TI1773A
Introduction
. 2.) are mechanically
IG
Fluid Outlet
(return line)
. 3.)
5