Nordson EFD 725DA-SS Handbuch

725DA-SS and 725DA Piston Valves

MAINTENANCE & PARTS GUIDE

IMPORTANT!

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Electronic pdf files of EFD®manuals are also available at

www.efd-inc.com/manuals.html.

For EFD sales and service in over 30 countries,

contact EFD or go to www.efd-inc.com/contact

EFD, Inc.

East Providence, RI USA

800-556-3484; +1-401-434-1680 (outside the USA)

[email protected] www.efd-inc.com

EFD International Inc.

Dunstable, Bedfordshire, UK

0800 585733 or +44 (0) 1582 666334

Ireland 00800 8272 9444

[email protected] www.efd-inc.com

EFD, Inc., Asia

China: +86 (21) 5854 2345

[email protected] www.efd-inc.com/cn

Singapore: +65 6896 9630 [email protected]

A NORDSON COMPANY

Fluid

inlet fitting

#7543BP

Shaft

#72537

Diaphragm

#72536

Shoulder

Fluid body

#72558A-SS

Sealing head

with screw

#72557

Body cap

#72543-SS

includes O-ring

Tip adapter

#2186BP

1/4 NPT

O-ring

#72540A

(Viton®)

Air cylinder

wall ID

Air cylinder

body assembly

#72560A

O-ring

#72530A

(Buna)

CAUTION: To prevent damage, the valve

must be disassembled starting at the fluid

outlet end of the valve.

234

1. Put threaded rod in mounting hole.

2. Remove body cap.

3. Remove sealing head.*

4. With a wrench on the flats of the

air cylinder body, turn to loosen

fluid body.

5. Remove fluid body.*

Note: For the 725DA-SS or 725DA, valve

set stroke adjustment to the full open

position (two complete rotations). The

stroke adjustment must stay open

throughout reassembly.

6. Remove input air hose from

push-in fitting on air cap.

7. Insert 1/8” hex wrench through air

inlet hole in cap and back shaft

locking screw out two turns.*

8. Using the the hex on the shaft,

unthread shaft, and remove shaft

and diaphragm.*

9. Unscrew air cyclinder cap from air

cylinder body.*

10. Remove piston and spring.

Note: Stroke adjustment ring on

the valve air cylinder assembly is

not removable. If this assembly

requires repair, it must be

returned to EFD.

Valve Disassembly and

Reassembly Procedures

www.efd-inc.com [email protected] USA 800-556-3484 Europe +44 (0) 1582 666334 Asia +86 (21) 5854 2345

Sales and service of EFD dispensing systems are available worldwide.

General Maintenance Kit

#725DA-RK

Includes air cylinder and body cap

O-rings, diaphragm, sealing head

with screw and lubricant.

Maintenance Tools:

1/8” hex wrench

1/4” flat-tip screwdriver

3/8” box wrench

(2) 8” adjustable wrenches

1/8 NPT male pipe or rod

Note: Before reassembling valve,

clean all parts, replace O-rings,

sealing head and diaphragm.

Inspect for damaged threads,

piston pins for straightness and

fluid body seat for pitting.

Reassemble the valve in reverse

order of disassembly. Lubricate

parts indicated with Nye Lubricant

#865 included in the General

Maintenance Kit.

step part newton meters (inch pounds)

3 Sealing head screw 1.69 Nm (15 inch pounds)

5 Fluid body 6.78 Nm (5 foot pounds)

7 Shaft locking screw 2.82 Nm (25 inch pounds)

8 Shaft 1.69 Nm (15 inch pounds)

9 Air cylinder cap 10.8 Nm (8 foot pounds)

*Parts that require a specific torque when reassembling the valve.

Air cylinder cap

with O-ring

#72530

O-ring only

#72530A (Buna)

Shaft locking screw

#72559A

Air piston with O-ring

#72555

O-ring only

#72532A

(Buna N)

Spring #72534

Push-in fitting

1/8 NPT x 1/4 OD

#2184

725DA-SS assembly of piston,

diaphragm and shaft.

www.efd-inc.com [email protected] USA 800-556-3484 Europe +44 (0) 1582 666334 Asia +86 (21) 5854 2345

Sales and service of EFD dispensing systems are available worldwide.

Troubleshooting Guide

No fluid flow

•If valve operating air pressure is

too low, the valve will not open.

Increase air pressure to 70 psi

(4.8 bar) minimum.

•The reservoir air pressure may not

be high enough. Increase pressure.

•The dispensing tip may be clogged.

Replace tip.

•The stroke adjustment may be

closed. Open stroke adjustment.

•Fluid may have solidified in the fluid

body. Clean the fluid body.

•Fluid supply line is installed in blind

mounting hole. Remove and reinstall

properly.

Fluid drools after the valve closes,

eventually stopping

•This is caused when air is trapped

in the outlet section of the fluid

body or the fluid has entrapped air.

The air will expand after the valve

closes, causing extrusion until the

air reaches atmospheric pressure.

Purge the valve by dispensing at

a steady flow until clear. If a small

tip is used, it may be necessary

to remove the tip while purging to

obtain sufficient flow to carry the

air down through the tip adapter.

•If the fluid has entrapped air, the

material must be degassed before

dispensing.

Note: For stripes and lines, input air

pressure can be lowered to elimi-

nate opening surge.

Fluid drips at a steady rate after the

valve closes

•A steady drip indicates failure of

the sealing head to close fully due

to particle buildup or wear. In either

case, replace the sealing head in

accordance with the maintenance

instructions.

Valve responds slowly when

opening and closing

•Valve response is related to control

air hose length and size. The EFD

valve is supplied with 5 feet of 1/8”

tubing attached. Any additional

length or size change will affect

response time. Check to be sure

the length and size have not been

changed.

Fluid flows out of the drain hole

•Fluid flowing out of the drain hole

indicates a ruptured diaphragm.

Replace in accordance with the

maintenance instructions.

Inconsistent deposits

•Inconsistent deposits can result

if the air pressure controlling the

valve and/or supplying the reservoir

is fluctuating or if the valve operating

pressure is less than 70 psi (4.8

bar). Check to be sure air pressures

are constant and the valve operating

pressure is 70 psi (4.8 bar).

•The time the valve is open must

be constant. Check to be sure

the valve controller is providing a

consistent output.

A NORDSON COMPANY

USA: 800-556-3484 or +1-401-434-1680

Europe: 0800 585733 or +44 (0) 1582 666334

Asia: +86 (21) 5854 2345

[email protected] www.efd-inc.com

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