Instruction, Maintenance, and Operation Manuals

Frequently Asked Questions

What manuals are available in the WTM Instruction, Maintenance and Operation section?

WTM provides manuals and related documentation for both current Koso Hammel Dahl products and original Hammel Dahl equipment.

Are manuals available for current Koso Hammel Dahl valves?

Yes. WTM provides a dedicated library of installation, maintenance, and operation information for supported current Koso Hammel Dahl valve and actuator products.

Are manuals available for discontinued or original Hammel Dahl products?

Yes. WTM maintains technical documentation for a number of original Hammel Dahl products and can assist with additional historical documents when available.

Can I use an original Hammel Dahl manual for a current Koso Hammel Dahl product?

Not automatically. Product designs, configurations, and revisions can differ. Always select technical documentation that corresponds to the exact equipment installed.

How do I identify the correct manual for my valve or actuator?

Use the exact manufacturer, series, model number, tag information, drawing, actuator model, and other nameplate data. If the correct document is unclear, contact WTM for assistance.

Why is the document revision important when servicing control valves?

Different product revisions may incorporate changes to components, materials, assembly procedures, settings, or maintenance requirements. Confirming the correct document helps ensure the instructions match the installed equipment.

Can WTM help locate a manual that is not listed online?

Yes. Contact WTM with as much equipment-identification information as possible. The company can assist in locating available documentation for supported Hammel Dahl and Koso Hammel Dahl products.