Flowserve Vogt Forged Steel Gate - Manual (Page 42)

Flow Control
Vogt Valves
42 Forged Steel Gate, Globe and Check Valves FCD VVENIM2000-02
Seal Welded Bonnet Piston Lift Check Valves
The valves in this category include those with threaded bonnets that,
once assembled, are seal welded. They contain no gaskets.
Bonnet Gasket Leaker
This would be a very unusual event, but if a seal weld leaks, it
should be ground out while the valve is not under pressure, and a
weld repair at the point of leakage shall be performed. See Section
4 for typical weld metal that can be used to weld repair carbon, alloy
and stainless steel valves.
Valve Seat Leaker
1. Remove the seal weld by grinding and/or machining.
2. Once the seal weld is removed, use a pipe or strap wrench to
remove the bonnet.
3. Lapping of the disc to body seat shall be per the previous
procedure.
4. Reassemble the bonnet to the valve.
5. Test the valve. If acceptable, proceed with replacing the seal
weld.
6. Test the valve for seal weld integrity, and if acceptable, place
valve back in service.
5.22 Vogt Motor-Operated Valve
(MOV) Installation and
Maintenance Instruction
References – Vogt MOV Installation And Maintenance Documents
1. VVAIM2000—Installation, Operation and Maintenance Manual
for Vogt Valves. Shipped with each MOV valve.
2. Applicable valve actuator installation and maintenance manual,
shipped with each Vogt MOV valve. Reference documents #1
and #2 are attached to the actuator.
3. Wiring diagram supplied with each Vogt MOV valve. Located
within the instrument panel of the valve actuator.
Valve Identification
The following information shall be provided for the Vogt MOV valve
when requesting information from Flowserve relating to the valve
and/or actuator.
1. The valve has a nameplate on the actuator mounting flange that
gives the details of the valve, such as pressure class, maximum
delta pressure, and drawing number. The drawing number shall
be used when making inquiry to Flowserve.
2. The actuator has a separate nameplate with details of the actua-
tor. A serial number is normally supplied and this number shall
be provided to Flowserve when making inquiry.
Vogt MOV Valve Installation
The installation of Vogt MOV valves shall be in accordance with the
following procedures:
1. General The Vogt MOV valve has been assembled and
performance-tested at the factory. All torque and limit switches
have been set to operate the valve at a seat closure pressure of
110 percent of the design pressure for which the actuator was
designed. The as-shipped Vogt MOV valve shall be installed and
maintained in accordance with the above reference documents.
The Vogt MOV valve is shipped complete with the reference
document package for the appropriate valve actuator. These
documents shall be used for the installation and maintenance of
the Vogt MOV valve.
2. Storage The Vogt MOV valve shall be stored in accordance
with the applicable Short Term and/or Long Term Storage
procedures in this manual. Reference document #2 for any
special storage requirement unique to the valve actuator. The
valve stem opening in the valve actuator has been sealed at the
factory. Other actuator wiring conduit openings in the actuator
have not been disturbed by Flowserve.
3. Welding Vogt MOV socket and butt-welding end valves shall
be installed using the applicable Recommended Installation
Welding Procedures provided in this manual.
4. c WARNING Any change in orientation of the actuator to the
as-shipped valve mounting during field installation, including
removal of the actuator from the valve, voids the actuator limit
switch settings that were set during final performance testing at
the factory. In the event the valve operator is removed from the
valve, the actuator is rotated on the valve, or the bonnet assem-
bly is rotated on the as-shipped valve, all actuator limit switches
shall be reset to the actuator drawing limit switch development
chart noted on Reference document #3. The procedures to set
the limit switches on the actuator are detailed in Reference #2
document. Damage to valve and/or actuator can occur if limit
switches are not properly set before installation.
5. Bonnet Gasket/Gate Replacement It is recommended that
the bonnet gasket be replaced if any disassembly of the valve
body/bonnet joint takes place. See Recommended Spare Parts
for the proper gasket. For MOV gate valves that are selectively
assembled by Flowserve, if the gate is removed from the MOV
valve place it back in the same valve and in the same orientation
as it was removed. Failure to follow this practice can lead to
permanent seating damage of the gate valve.