Quick-check – Flowserve Valtek Mark One and Mark Two Control Valves User Manual

Page 6

Valtek Mark One and Mark Two Control Valves FCD VLENIM001-01-AQ - 8/14

WARNING: Failure to install half rings on the valve body can

cause serious personal injury.

3.9.

Connect the air supply and instrument signal lines. Throt-

tling control valves are equipped with a valve positioner.
Refer to the appropriate positioner bulletin for connections,
maximum air supplies, and maintenance instructions. An air
filter should be installed before the positioner. All connec-
tions must be free of leaks.

CAUTION: On valves equipped with air filters, the air filter

must point down to perform properly.

4. Quick-check

Prior to start-up, check the control valve by following these

steps:

4.1.

Stroke the valve and observe the plug position indicator on

the stem clamp compared to the stroke indicator plate. The
plug should change position in a smooth, linear fashion.

STOP!

NOTE: Due to excessive friction a dry graphite packing can

cause the plug stem to move in a jerky fashion. Lubrication
of graphite packing will provide smoother stroking. Lubri-
cation can be done by using a bonnet lubricator or by lib-
erally coating each packing ring by hand during installation.
Please refer to Table I for lists of common lubricants.

WARNING: Keep hands, hair and clothing away from all

moving parts when operating the valve. Failure to do so can
cause serious injury.

4.2.

Check for full stroke by making appropriate instrument sig-

nal changes.

4.3.

Check all air connections for leaks.

4.4.

Check packing box bolting for the correct adjustment. Re-

fer to the packing installation manual for specific details on
maintaining the style of packing supplied.

Figure 2: Pressure Balanced Mark One Control Valve Body Assembly

*Optional angle body