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725HF-SS and 725HF-A
Piston Valves 

MAINTENANCE & PARTS GUIDE

IMPORTANT!

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Maintenance or 

Tool Crib 

Supervisors

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

Summary of Contents for 725HF-SS

Page 1: ... 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 info efd inc com www efd inc com EFD International Inc Dunstable Bedfordshire UK 0800 585733 or 44 0 1582 666334 Ireland 00800 8272 9444 europe efd inc com www efd inc com EFD Inc Asia China 86 21 5854 2345 china efd inc com www efd inc com cn Singapore 65 6...

Page 2: ...8 hex wrench through air inlet hole in cap and turn shaft locking screw out two turns 8 Using the hex on the shaft unthread shaft and remove shaft and diaphragm 9 Unscrew air cylinder cap from air cylinder body 10 Remove piston and spring 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...

Page 3: ...coated sealing head screws Maintenance Tools 1 8 hex wrench 1 4 flat tip screwdriver 3 8 box wrench 7 8 open end wrench 8 adjustable wrench 1 4 NPT male pipe or rod step part newton meters inch pounds 3 Sealing head screw 1 69 Nm 15 inch pounds 5 Stainless steel fluid body 10 8 13 6 Nm 8 10 foot pounds 5 Acetal fluid body 033 Nm 30 inch pounds 7 Shaft locking screw 2 82 Nm 25 inch pounds 8 Shaft 1...

Page 4: ...of the sealing head to close fully due to particle build up 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 valve is supplied with 5 feet of 1 8 tub ing attached Any additional length or size change will affect response time Check to be su...

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