AERCO Belimo F7...HD/HDU Series Valve - Manual (Page 43)

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Maintenance Instructions
Safety Precautions
Before removing the valve from the line or loosening any bolts, it is
important to verify the following conditions:
1. Be sure the line is depressurized and drained.
2. Be sure of the pipeline media. Proper care should be taken for
protection against toxic and/or flammable fluids.
3. Never remove the valve without an Operator (Manual or Automatic)
already attached to the valve shaft.
4. Never remove the Operator from the valve while the valve is in the
pipeline under pressure.
5. Always be sure that the disc is cracked approximately 5° off of the
closed position before removing the valve.
General Maintenance
The following periodic preventative maintenance practices are
recommended for all Butterfly Valves.
1. Operate the valve from full open to full closed to assure operability.
2. Check flange bolting, actuator mounts and hangers for
evidence of loosening and correct as needed.
3. Inspect the valve and surrounding area for previous or existing
leakage at flange faces or shaft connections.
4. Check piping and/or wiring to actuators and related
equipment for looseness and correct as needed.
Installation Recommendations
F6…HD(U), F7…HD(U) Series Butterfl y Valves
Valve Installation- Dead End Service
1. Follow previously described pre-installation and installation
procedures.
2. To achieve the full close-off pressure of the HD/HDU series, a
flange is required on the open or down stream side of the valve
(Fig. 9)
1 1 Fig. 9