Flowserve Valtek Installation, Operation & Maintenance Instructions Manual

Valtek Extended Bonnets
GENERAL INFORMATION
The following instructions are designed to assist in
installing, disassembling and troubleshooting Valtek
globe valves equipped with extended bonnets. Product
users and maintenance personnel should thoroughly
review this bulletin in conjunction with Installation, Op-
eration Maintenance Instructions 1 (Mark One and Two
Control Valves) before installing, operating or perform-
ing any maintenance on the valve.
To avoid possible injury to personnel or dam-
age to valve parts, WARNING and CAUTION
notes must be strictly adhered to. Modifying
this product, substituting nonfactory parts, or
using maintenance procedures other than out-
lined could drastically affect performance and
be hazardous to personnel and equipment, and
may void existing warranties.
Five bonnet designs exist: two extended bonnet de-
signs (one-piece bonnets) and three bonnet extension
designs in which the extension clamps to a standard
bonnet. This bulletin presents instructions and sec-
tioned-view drawings for all five designs.
Installation
Valtek valves equipped with extended bonnets are
designed to be installed vertically. This ensures a stag-
nated, moderate temperature vapor barrier inside the
bonnet, protecting the packing from the process.
CAUTION: Do not insulate the extended bonnet or
bonnet extension. Although thermal insulation may
be installed on the valve body and adjoining piping
for extreme temperature service, the extended bon-
net operates in hot service by radiating heat to
atmosphere, and in cryogenic service by collecting
heat from atmosphere. Insulating the bonnet will
affect performance and possibly damage the valve.
Valtek No. 49024
IM014 Extended Bonnets.p65 1
DISASSEMBLY AND REASSEMBLY
Disassembling One-piece or One-piece
®
Cryogenic Extended Bonnets
To disassemble valves equipped with extended bon-
nets, refer to Figures 1 and 2 then proceed as follows:
WARNING: Depressurize line to atmospheric pres-
sure, drain all fluids and decontaminate the valve (if
caustic or hazardous materials are present). Failure
to do so can cause serious injury.
1. Remove bonnet flange bolts or nuts.
2. Remove the entire actuator/bonnet assembly by
lifting it straight out of the body.
CAUTION: Heavy assemblies may require a
hoist. Attach lifting straps to actuator yoke legs.
3. Loosen the actuator stem clamp.
4. Remove the packing box bolting.
WARNING: Process fluid may be trapped in the
extended bonnet; therefore, be extremely cau-
tious when removing the plug from the bonnet.
Failure to do so can cause serious injury or
damage to equipment.
5. Remove yoke bolting, clamps, and half rings
(if present).
6. Remove the actuator by unscrewing the plug and
bonnet from the actuator stem. To avoid galling the
plug stem, the bonnet must be turned with the plug
when unscrewing it from the actuator. This ensures
the plug does not turn in relation to the packing box,
which may cause plug stem damage.
WARNING: Do not allow the plug or bonnet to fall
during removal from the actuator. Serious per-
sonal injury or valve damage may result.
7. Remove the bonnet flange from the bonnet.
8. Pull the plug carefully through the packing box.
8/21/01, 2:14 PM
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