Reassembling The Body - Flowserve Valtek Mark One Installation, Operation & Maintenance Instructions Manual

NOTE: With air-to-close, fail-open valves, it may be
necessary to apply a small amount of air to the top
of the actuator to move the plug away from the
bonnet. Otherwise, plug galling may occur.
Turn the actuator off the plug and bonnet without
allowing the plug to rotate within the bonnet. Pull the
plug carefully through the packing box.
CAUTION: To avoid scoring guides and plug
stem, follow the above procedure exactly.
6. If the seat surfaces need remachining, both sur-
faces on plug and seat ring must be reworked. The
seat angle on the plug is 30 degrees (36 degrees for
CavControl and Channel Stream valves); the seat
ring, 33 degrees. Lapping is not necessary if proper
assembly procedures are followed.
CAUTION: If remachining, protect the stem
while turning. Ensure concentricity of the seat
surface with the plug stem (or outside diameter
of the seat ring, if machining the seat).
7. To replace packing or change the packing box
configuration, from underneath the bonnet push out
packing, spacer and guides with a dowel of the
same approximate size as the plug stem.
WARNING: For valves equipped with separable
end flanges, do not machine body gasket sur-
faces. Machining could cause failure of the
separable flange lip causing end gasket leak-
age and valve failure.
8. If separable end flanges need to be removed, file off
tack welds or pull rivets behind the flanges.
CAUTION: When using separable end flanges
and spiral wound gaskets, use gaskets with
outer backup rings. Failure to do so could result
in excess stress in some applications.
NOTE: To prevent flanges from dropping off during
shipping, a tack weld or stainless steel rivet has
been installed behind the end flanges.

Reassembling the Body

To reassemble the valve body, refer to Figures 1, 2 and
4 then proceed as follows:
1. If the packing has been removed, refer to Figure 2
and reinstall new packing exactly as shown. Make
sure at least 1 / -inch is left at the top of packing box
8
for the top guide to enter. Different spacer lengths
permit a wide variety of packing configurations,
such as twin seal and vacuum-pressure packing.
WARNING: Valves with extended bonnets or
metal bellows seals must not have lower pack-
ing installed. Instead, lower packing rings
1-6
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.
The graphite guide liners should be replaced each
time the valve packing is replaced. Do not rebuild
the valve without graphite liners in the guides.
2. Reinsert the plug stem into the packing box, being
careful not to score the stem or the guides.
3. 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 engag-
ing the plug stem and actuator stem threads.
NOTE: Do not allow the gland flange to contact and
gall the polished plug stem.
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.
4. Install new bonnet and seat gaskets with the bev-
eled edge up for Teflon gaskets.
5. Insert the seat ring into the body with the step side
down. Place the seat retainer into the body with the
thin end of the cathedral window down.
NOTE: For ANSI Class 900 and above valves with
valve sizes 1 / - through 1
2
window should be placed in the body with the
window facing toward the valve ports. With valves
2-inches and larger, the retainer's bar should face
toward the valve ports.
6. Place air under the actuator piston on air-to-open
valves to retract the plug.
7. Lower the plug and bonnet squarely into the body.
Be careful not to scratch or gall the plug as it enters
the body.
8. To properly align the seat ring and plug, first bring
the bonnet bolting to finger-tightness.
a. With pneumatic actuators, apply air pressure
above the piston to seat the plug in the seat ring.
Proceed to step 9.
b. With electric or hydraulic actuators, move the
actuator stem down until it is completely ex-
tended. Next, retract the actuator stem
3.175 mm. Install the stem clamp onto the plug
stem / actuator stem and tighten the associated
bolting. Move the actuator stem completely
down. Adjust actuator limit switches according to
the actuator's operating manual.
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
1 / -inch, the seat retainer
2
1
/ inch /
8