This manual provides installation, operation, and maintenance instructions for Pure-Flo manual operation diaphragm valves.
This manual covers the safe installation, operation, adjustment and regular maintenance of the Pure-Flo 970 handwheel operated diaphragm valve. It includes safety requirements, qualification of personnel, transport and storage guidelines, as well as detailed procedures for adjusting travel limits and replacing diaphragms.
The document also provides technical data such as valve stem travel and turn counts for various pipe sizes, torque specifications for valve head bolts, and recommended lubrication oils. Contact information for ITT Pure‑Flo support in the USA, China and the UK is listed for further assistance. This manual is written in Chinese.
| DN15 valve stem travel and turns | 6.4 mm travel, 2 turns |
|---|---|
| DN20 valve stem travel and turns | 9.5 mm travel, 3 turns |
Operators, maintenance staff and assemblers must have appropriate qualifications and training as required by the manufacturer.
To adjust the travel limit, remove the travel‑limit bolt, mount the valve on the test rig, apply pressure, rotate the handwheel until leakage stops, then press the wheel against the limit surface and reinstall the bolt.
First depressurize the line, rotate the handwheel to close the valve, remove the valve head nut, take off the head, detach the compression assembly, remove the old diaphragm, install a new diaphragm of the same specification, re‑assemble, and re‑tighten the head nut.