Assembly And Installation; Figure 4: Soft Seat Assembly; Figure 5: Actuator Stem / Stem Clamp Alignment - Flowserve Valtek Mark Two User Instructions

Soft Seat Retainer
Soft Seat
Seat Ring

Figure 4: Soft Seat Assembly

Figure 5: Actuator Stem / Stem Clamp Alignment

10
Valtek Mark One and Mark Two Control Valves FCD VLENIM0001-02-A4 - 05/16

7 Assembly and Installation

7.1
7.2
a
7.3
7.4
NOTE: Separate User Manuals with instructions on assembling
actuators, positioners and other equipment can be found on
www.flowserve.com. Review any relevant User Manual before
proceeding
NOTE: It is recommended that all soft goods are replaced
when rebuilding Mark One and Two control valves. Soft
goods include gaskets, pressure balanced seals, soft seat
inserts, guide liners and packing seats.
Replacing these parts helps to ensure proper functioning of
the control valve.
To reassemble the valve body, refer to figures 1, 2 and 6
through 9 and proceed as follows:
If the packing has been removed, refer to the appropriate
packing User Manual (document number VLAIM040) and
reinstall the packing and lower guide exactly as shown. Make
sure at least 1/8 inch is left at the top of the packing box for
the top guide to sit into the bonnet. Different packing spacers
permit a wide variety of packing configurations, such as twin
seal and vacuum-pressure packing.
CAUTION: Valves with extended bonnets or metal bellows
seals must not have lower packing installed. Instead, lower
packing rings should be installed with the upper set. Lower
packing installed in extended bonnets or metal bellows seal
valves will diminish the integrity of the packing assembly.
NOTE: Guide liners should be replaced each time the valve
packing is replaced. Do not rebuild the valve without the
correct guide liners.
Re-insert the plug stem into the packing box, being careful
not to score the plug stem or the guides. Reinstall pressure
balanced seals if required.
Turn actuator back onto the plug, without turning the plug
inside the bonnet. Make sure the gland flange and bonnet
flange are in place before engaging the plug stem and
actuator stem threads. The gland flange chamfer must be
face down towards the valve body. Leave approximately
three to four plug stem threads exposed. Attach yoke clamp
and gland flange bolting. For valves with a 2-inch spud, be
sure the half rings are in place between the yoke and bonnet.
Firmly tighten yoke clamp bolting. The packing box nuts
should be just over finger tight.
NOTE: Do not allow the gland flange to contact and gall the
polished plug stem.