User's Manual

ManualsBrandsGraco ManualsHydraulic Piston PumpsGraco Trabon Modu-Flo System

7-1/(7-2 Blank)

42000Modu-Flo

System

OPERATION AND

SERVICE INSTRUCTIONS

Modu–Flo®

System

SECTION 7

PNEUMATIC SOLENOID

7.1 DESCRIPTION ........................................................... 7-1

7.2 OPERATION ............................................................... 7-1

7.3 INSTALLATION ........................................................... 7-1

7.1 DESCRIPTION

The Pneumatic Solenoid Valve option S1 is designed for

use in 115 VAC applications, while the S2 option is for 24

VDC applications. The solenoid valve is supplied with the

selection plate in a normally closed configuration, making

the solenoid a two way valve. It comes equipped with a

manual override operator and with 18 inch long #18 AWG

coil lead wires.

7.2 OPERATION

When voltage is applied to the solenoid coil, the valve is

opened, allowing air to flow through to the pump manifold

and to the pneumatic piston in the pump. As air is being

supplied, the pneumatic piston moves forward and pushes

the lube piston forward which discharges lubricant to the

system. When voltage is dropped out, air flow is stopped.

The pneumatic and lube piston are returned by the piston

return spring, thus allowing the pump to reprime for the next

cycle.

7.3 INSTALLATION

Installing the solenoid valve to the pump manifold requires

making sure the o-rings (4) are in place. Mount the solenoid

valve to the pump manifold port stamped “SA” with the valve

bolt. Torque to 10-15 ft. lbs.

Table 7-1. Pneumatic Solenoid Parts List

Item Number Part Number Description Quantity

521-001-020 115 VAC SOLENOID ASSEMBLY (S1)

521-002-100 24 VDC SOLENOID ASSEMBLY (S2)

1 521-000-540 115 VAC SOLENOID VALVE WITH COIL 1

521-004-550 24 VDC SOLENOID VALVE WITH COIL 1

2 521-000-550 MANIFOLD BLOCK 1

3 521-000-560 BOLT-MOUNTING 1

4 422-010-160 O-RING 2

5 416-060-120 SCREW-#8-32 X 1-1/4 2

6 521-000-542 NO/NC “PORT PLATE”, PART OF ITEM 1 1

Figure 7-1. Pneumatic Solenoid

1/4-18 NPSF

THREAD

TORQUE

10-15 FT. LBS

1/2 NPSM

CONDUIT

CONNECTION

MANUAL

OVERRIDE

1/4 NPSF

"AIR INLET"

2.188

3.312