Nordson EFD 752V Series Manuel

752V Series Diaphragm Valve

MAINTENANCE & PARTS GUIDE

IMPORTANT!

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Maintenance or

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Electronic pdf files of EFD®manuals are also available at

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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

Diaphragm

Fluid

body

Tip adapter

(2) Retainer

screws

#7524

Fluid inlet fitting

Air cylinder body

#7527-SS (stainless steel)

#7527 (hard-coated aluminum)

Air input hose & fitting

#78518A

Piston and rod

includes O-ring (Buna N)

#7518

Piston O-ring

#7519

Fluid Body

1. Remove the two retainer screws.

2. To reinstall the fluid body, align

fluid body holes with diaphragm

and cylinder body holes and rein-

sert retainer screws. Tighten in

accordance with the following

torque specifications:

Diaphragm

3. Back out stroke control knob

two turns

counterclockwise from the

closed position.

4. Remove fluid body.

5. Unscrew diaphragm (counter-

clockwise) and remove it from

the piston rod.

newton

Fluid body meters (inch pounds)

Acetal (black) 1.58 Nm (14 inch pounds)

UHMW*(yellow) 0.79 Nm (7 inch pounds)

Stainless steel 1.58 Nm (14 inch pounds)

*Ultra High Molecular Weight

6. Thread on the new diaphragm and

tighten with medium pressure.

7. Align the holes of the diaphragm

with the appropriate holes in the air

cylinder body by inserting a flat tip

screwdriver through the hole in the

stroke control knob and engage

piston rod slot.

8. Rotate rod, piston and diaphragm

assembly clockwise until holes are

aligned.

9. Reinstall fluid body.

10. Turn stroke control knob clockwise

until closed, and then reopen to

desired stroke.

14 15

Valve Disassembly and

Reassembly Procedures

CAUTION: To prevent damage, the valve

must be disassembled starting at the

fluid outlet end of the valve.

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.

Piston spring

#7525

Piston

retainer ring

#7526

Stroke control knob

O-ring #7517

Stroke control knob

#750SR-KIT

(stroke reference,

aluminum)

#750SSR-KIT

(stroke reference,

stainless steel)

Tamper-resist

stroke control

752V-DVD

(stainless steel)

#7545SS

Anti-torque washer

#7533

Tools required:

7/64” hex wrench

1/8” flat-tip screwdriver

6” adjustable wrench

6” needle-nose pliers

snap-ring pliers

Piston O-ring

11. Remove fluid body and diaphragm.

12. Remove stroke control knob and

spring by turning counter-clockwise.

13. Remove the piston retainer ring and

anti-torque washer.

14. Remove the piston.

15. Lubricate O-ring, piston shaft and air

cylinder wall with Nye Lubricant #865.

16. Reinstall components in

reverse order of disassembly.

Replacement Parts for Specific Valve Models

Fluid Body

Model UHMW*Acetal Stainless Fluid Inlet Fitting Tip Adapter Diaphragm

752V & n/a 7521E 7521E-SS†7543BP (1/4” OD Tube) 7536BP 7510

752V-SS

752V-UH & 7521F n/a 7521E-SS 7543BP (1/4” OD Tube) 7536NP 7510

752V-UHSS

752V-DVD 7521DVD-UH n/a 7521DVD-SS 7543BP (1/4” OD Tube) 7536BP 7510-DVD

*Ultra High Molecular Weight

†optional

13 16

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 valve.

Clean the fluid body.

Fluid drools after the valve closes,

eventually stopping

•This is caused when air is trapped in

the outlet section of the fluid chamber

or the fluid has entrapped air. The air

will expand after the valve closes, caus-

ing 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.

Fluid drips at a steady rate after the

valve closes

•A steady drip can be caused by exces-

sive reservoir pressure. Check to be

sure the reservoir pressure is not above

70 psi (4.8 bar).

•If the stroke adjustment knob is turned-

out more than two full turns, resulting in

reservoir pressure that will force the

diaphragm open. Check the stroke

adjustment knob to be sure it is less

than two turns out.

•A steady drip also indicates failure of

the diaphragm to close fully due to par-

ticle build-up or wear. In either case,

replace the sealing head in accordance

with the maintenance instructions.

Fluid leaks out between fluid body and

diaphragm

•Fluid leakage between the fluid body and

diaphragm indicates the annular seal-

ing ridge on the fluid body is damaged or

the fluid body is distorted due to exces-

sive torque on the retaining screws. In

either case, replace the fluid body.

Fluid flows out of the drain hole

•Fluid flowing out of the drain hole indicates

a ruptured diaphragm. Replace in accor-

dance with the maintenance instructions.

Valve responds slowly when opening

and closing

•Valve response is related to control air

hose length and size. The valve is sup-

plied with 5-feet of 3/32” ID tubing

attached. Any additional length or size

change will affect response time. Check

to be sure the length and size have not

been changed.

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 con-

stant. Check to be sure the valve con-

troller 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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