Graco Inc 233757 Introduction, Back Pressure Regulators, Fluid Pressure Regulators

Introduction

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 dis- pensing 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 regu- lator is shown in FIG. 1.

Fluid Inlet (from gun)

Fluid Pressure Regulators

Models 233757, 233759, 233774, 234263, 234267, and 234273 (FIG. 2.) are mechanically operated fluid pres- sure regulators designed primarily for use with low to medium viscosity fluids.

Models 233773, 233809, 234256, and 234272 (FIG. 3.) are pneumatically operated fluid pressure regulators designed primarily for use with highly viscous coatings.

Air inlet

Piston
Diaphragm	Fluid Outlet
	(return line)

Valve plunger

TI1773A

Fig. 1. Cutaway of Pneumatic Back Pressure Regulator

6 309474K