Flowserve Vogt Forged Steel Gate - Manual (Page 43)

Flow Control
Vogt Valves
FCD VVENIM2000-02 Forged Steel Gate, Globe and Check Valves 43
6. Water Entry During installation, all the openings to the actua-
tor shall be maintained to ensure that water does not enter into
the actuator electrical control compartment. The valve actuator
is most vulnerable to water entry during the electrical wiring
stage when wiring conduit openings are left open and subject to
rainfall. In the event water is unintentionally allowed to collect
in the electrical compartment of the actuator the valve actuator
manufacturer shall be contacted for maintenance instructions if
not detailed in the maintenance instructions.
7. Valve Or Actuator Field Replacement In the event that the
valve is replaced or the valve actuator interfaced with the Vogt
MOV valve at the field job site, all torque and limit switches shall
be set prior to operating. The torque and limit switch setting
procedure is detailed in Reference #2. Unless otherwise speci-
fied, all Vogt as-shipped MOV valves are torque-seated on the
shutoff seat and limit-seated on the backseat. Failure to do so
can result in severe damage to valve and/or actuator.
8. Wiring The installation of the electrical wiring to the actuator
shall be done in accordance with the Reference documents #2
and #3.
9. Initial Electrical Operation The actuator initial operation and
setting of torque and limit switches disturbed during valve as-
sembly installation shall be done in accordance with document
#2. Unless otherwise specified, all Vogt as-shipped MOV valves
are torque-seated on the shutoff seat and limit-seated on the
backseat.
a CAUTION: During the electrical start-up phase, “phase
rotation” of the actuator (electrical motor) is most
critical and, if the actuator rotation is incorrect, serious
damage can occur to the valve. Reference document
#2 has instructions on how to check and correct phase
rotation.
10. System Pressurization Once the system is under pressure,
the final setting on the actuator torque switches may need to be
adjusted. During performance testing at Flowserve the closing
torque switch is set to the lowest level to acceptably pass a
seat test of 110 percent of the pressure for which the actuator
was sized. When in operation, the torque switch may need to
adjusted upward to ensure that the valve is fully closed under
field conditions. Torque switch adjustment shall be performed in
accordance with the instructions in Reference #2.
Vogt MOV Valve Maintenance
Recommended Spare Parts
1. Bonnet gasket—See Section 1 for part number. Listed gaskets
are available from Flowserve distribution on short notice.
2. Packing—See Section 1 for part number. Listed packing is avail-
able from Flowserve distribution on short notice.
3. Actuator—See applicable Installation, Operation and Mainte-
nance Manual supplied with each Vogt MOV valve or request a
Recommended Spare Parts for Actuators when ordering.
a CAUTION:
1. The system pressure shall be totally isolated and
vented from the valve to ensure it is at zero pressure
while being repaired.
2. Consult the reference document #2 for safety pre-
cautions when troubleshooting the actuator.
3. For small valves, valve replacement may be the most
economical way to facilitate repair. Vogt Valves can
replace the valve that will interface with the existing
actuator. The valve nameplate gives the drawing num-
ber for the valve. Provide this to the authorized Vogt
distributor for replacement.
Bonnet Leaker/Seat Leaker for Vogt MOV Gate,
Globe or Angle Valve
1. See the applicable procedure for Gate, Globe or Angle valve
detailed in this manual for repair of bonnet and/or seat leakers.
2. Stem breakage is common with MOV valves during the early
stages of operation. To replace, remove the bonnet, remove the
broken stem and insert a new stem. Make sure that the broken
stem is removed from the stem nut in the valve actuator before
replacing the new stem.
3. Replace the bonnet and torque bonnet bolts to the values noted
in Section 5 for the appropriate bolting size.
4. Since the bonnet has been removed, the torque and limit
switches will have to be reset on the actuator. See Reference
document #2 for instructions.
5. After setting the switches, place valve back in operation.
Actuator Troubleshooting
1. The orientation of the valve may require that the Torque switch
on the actuator be adjusted upon placement in service. The
referenced document shall be consulted to increase/decrease
the torque output of the actuator.