Graco 918468 Datasheet

3 in. (76 mm) and 6.5 in. (165 mm) Ram

Pneumatic Crossover Kit

250 psi (1.7 MPa, 17.2 bar) Maximum Air Inlet Pressure

Part No. 918468, Series B Pneumatic Crossover Kit (shown)

For 3 in. (76 mm), 2 post, 55 gal. (200 liter) rams

Part No. 918393, Series A Pneumatic Crossover Kit

For 6.5 in. (165 mm), 2 post, 55 gal. (200 liter) rams

Table of Contents

Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component Identification and Function 4. . . . . . . . . . . .

Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Warranty 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Information 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instructions–Parts List

310293J

ENG

Important Safety Instructions

Read all warnings and instructions in this manual.

Save these instructions.

2 310293

Symbols

Warning Symbol

WARNING

This symbol alerts you to the possibility of serious

injury or death if you do not follow the instructions.

Caution Symbol

CAUTION

This symbol alerts you to the possibility of damage to

or destruction of equipment if you do not follow the

instructions.

WARNINGS

INSTRUCTIONS

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.

DThis equipment is for professional use only.

DRead all instruction manuals, tags, and labels before operating the equipment.

DUse the equipment only for its intended purpose. If you are not sure, call your Graco distributor.

DDo not alter or modify this equipment. Use only genuine Graco parts and accessories.

DCheck equipment daily. Repair or replace worn or damaged parts immediately.

DDo not exceed the maximum working pressure stated on the equipment or in the Technical Data

for your equipment. Do not exceed the maximum working pressure of the lowest rated component

in your system.

DUse fluids and solvents which are compatible with the equipment wetted parts. Refer to Technical

Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.

DWear hearing protection when operating this equipment.

DComply with all applicable local, state, and national fire, electrical, and safety regulations.

310293 3

WARNINGS

MOVING PARTS HAZARD

Moving parts, such as the ram follower plate/pump inlet can pinch fingers.

DDo not operate the equipment with the guard removed.

DKeep clear of all moving parts when starting or operating the equipment.

DKeep hands and fingers away from the priming piston during operation and whenever the pump is

charged with air.

DKeep clear of the follower plate, pump fluid inlet, and lip of the fluid container when raising or

lowering the ram.

DBefore checking or servicing the ram or pump, follow the Pressure Relief Procedure in the ram or

pump manual.

TOXIC FLUID HAZARD

Hazardous fluid or toxic fumes can cause serious injury or death if splashed in the eyes or on the skin,

inhaled, or swallowed.

DKnow the specific hazards of the fluid you are using.

DStore hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,

state and national guidelines.

DAlways wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and

solvent manufacturer.

DAvoid exposure to heated material fumes.

DProvide adequate ventilation.

4 310293

Component Identification and Function

!NG

Fig. 1

AB C

KEY

ABall Valve

BRegulator

C4–Way Piloted Air Valve

DLimit Valves (2)

E3/4 npsm Main Air Inlet

F1/4 in. Nylon Tube

G3/8 in. Nylon Tube

H15 ft. (4.6 m) Coupled Hose

J6 ft. (1.8 m) Coupled Hose

NOTE: Viewed from the

loading direction.

Supply Unit A Supply Unit B

310293 5

Installation

Prepare the Site

NOTE: Always use Genuine Graco Parts and Acces-

sories, available from your Graco distributor. If you

supply your own accessories, be sure they are ade-

quately sized and pressure rated for your system.

NOTE: Letters and numbers in parenthesis refer to the

callouts and the parts list on page 10.

Bring a compressed air supply line from the air com-

pressor to the pump location. Be sure all air hoses are

properly sized and pressure-rated for your system.

Use only electrically conductive hoses. The air hose

should have a 3/4 npsm(m) thread.

Before installing any air line components, blow out the

air lines to remove scale and other debris. Use pipe

compound or tape sparingly and only on male threads.

Install a bleed-type shutoff valve in the air line up-

stream from all other air line components, to isolate

them for servicing.

Application

The pneumatic crossover kit is designed to allow two

drum ram systems to be converted into a continuous–

flow system. It shifts pumping from an online ram

when the drum becomes empty.

Typical Pneumatic Crossover Installation

WARNING

Never leave fingers between the ram plate and the

drum when the ram plate is being operated.

WARNING

Never enter the operating area of the ram , when

the ram is in the top position. When the air pres-

sure is lost or in the case of leaks in the air pres-

sure system, the ram plate may drop.

The typical installation, shown on the cover of this

manual, is only a guide. See the system manual for

your application or contact your Graco distributor for

assistance in designing a system to meet your needs.

See your ram manual if installing a new ram or relocat-

ing an existing ram.

6 310293

Installation

Pneumatic Crossover Setup

Install the pneumatic crossover as shown in Fig. 1.

Also refer to the applicable Schematic, Figs. 2 and 3.

NOTE: During system operation, as the ram ap-

proaches the drum bottom, the top of the ram contacts

the limit valve switch. The switch shuts off air to the

ram air motor via a 4–way piloted air valve (3). As the

valve stops air to one air motor it starts air to the other

air motor. This allows constant material flow and

changing out of material drums.

NOTE: The position of the limit valve (4) on the ram

determines when the ram air motor is turned on and

off. During operation this position can be adjusted as

desired. See Fig. 1.

1. Cut nylon tubing (3,9) to fit.

2. Adjust limit valve (10) to trip with the ram plate 1”

from base plate (see Fig. 1).

NOTE: Do not remove factory installed plugs from pilot

ports.

3. Remove roller and extension piece from limit

valve (10) and replace roller, without extension, on

limit valve.

Fig. 2

Model 918468

310293 7

Installation

8889A

Model 918393

Fig. 3

8 310293

Parts

!NG

TI0388

17, 18, 19, 20

10, 11, 12, 13, 14

15 16

17, 18, 19, 20

10, 11, 12, 13, 14

24 25

39, 40, 41, 51

Supply Unit “A” Supply Unit “B”

AND CLOSE IMMEDIATELY

PRIMING A RELOADED UNIT

ONLY OPEN THIS VALVE FOR

THEREAFTER.

49,50

Model 918468 Pneumatic Crossover

Includes items 1–50 (See page 9)

310293 9

Parts

Model 918468 Pneumatic Crossover

Includes items 1–50

Ref Part

No. No. Description Qty

Ref Part

No. No. Description Qty

1 100139 PLUG, pipe 2

2 111162 FITTING, elbow 4

3 C12509 TUBE, nylon, round, 1/4 in. OD 20 ft

4 113208 FITTING, tube 2

5 C19391 FITTING, elbow 2

6 104984 TEE, pipe 2

7 156971 NIPPLE, short 2

8 120389 FITTING, tube, 2

9 C12508 TUBE, nylon, round, 3/8 in. OD 20 ft

10 C06182 VALVE, limit, air 2

11 C19965 SCREW, cap, soc hd 4

12 100813 WASHER, flat, brass, #6 8

13 100068 WASHER, lock, 4

14 100072 NUT, hex, #6 4

15 C06061 MUFFLER 4

16 C50064 BRACKET, valve, limit 2

17 C24332 BOLT, “U”, 3/8–16 2

18 C19200 WASHER, flat, 3/8 4

19 100133 WASHER, lock, 3/8 4

20 100307 NUT, hex, 3/8–16 4

21 C12030 HOSE, coupled, 3/4 npt,15 ft 1

23 C20359 FITTING, tee 1

24 100081 BUSHING, reducing 1

25 104266 REGULATOR, air 1

26 157191 NIPPLE, reducing, hex 1

27 C20487 NIPPLE, hex 1

28 166466 TEE, plain, 3/4 npt 1

29 157785 UNION, swivel 2

32 C12034 HOSE, coupled, 3/4 npt, 6 ft 1

33 110226 VALVE, vented, 2–way 2

35 100642 SCREW, cap, soc hd, 1/4–20 x 2 2

37 520070 VALVE, air, 4–way piloted 1

38 615023 PLATE, mounting, valve 1

39 520071 U–BOLT, 5/16–18 2

40 100214 WASHER, lock, 5/16 4

41 111303 NUT, hex, 5/16–18 4

42 160327 UNION, adapter 2

43 100960 GAUGE, pressure, air, 0–200 psi 1

45 157129 NIPPLE, 3/4 X 3 1/4 in. 1

46 C19685 BUSHING, red, hex; 3/4 x 1/2 2

47 114110 ELBOW, 1/2 npt(m) 2

48 054139 TUBE, nylon 9 in.

49YC50083 TAG, instruction 1

50 112278 STRAP, tie 1

51 100023 WASHER, flat 4

YReplacement Danger and Warning labels, tags and cards

are available at no cost.

10 310293

Parts

Model 918393 Pneumatic Crossover

Includes items 1–50 (See page 11)

8887A

41, 42 43, 44

33, 32

46, 33, 32

37, 17, 18

5, 6, 7, 8, 7, 8

1, 2, 3, 4, 5

29,17,18

27, 29

32, 33

9, 10, 38

31, 22, 21, 30

33, 32

24, 23, 22, 21

16, 28

18, 17

34, 35

SUPPLY AIR IN (1/2 NPT)

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