Flowserve Vogt Forged Steel Gate - Manual (Page 44)

Flow Control
Vogt Valves
44 Forged Steel Gate, Globe and Check Valves FCD VVENIM2000-02
5.23 Vogt Air-Operated Valve
(AOV) Installation and
Maintenance Instruction
References – Vogt AOV Installation and
Maintenance Documents
1. VVAIM2000 – Installation, Operation and Maintenance Manual
for Vogt Valves. Shipped with each AOV valve.
2. Applicable valve actuator installation and maintenance manual,
shipped with each Vogt AOV valve. Reference documents #1
and #2 are attached to the actuator.
3. Actuator accessories manuals. Examples—positioner, limit
switch, solenoid valve, etc., manuals.
Valve Identification
The following information shall be provided for the Vogt AOV valve
when requesting information from Flowserve relating to the valve
and/or actuator.
1. The Vogt AOV 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 inquiries.
Vogt AOV Valve Installation
The installation of Vogt AOV valves shall be in accordance with the
following procedures:
1. General The Vogt AOV valve has been assembled and perfor-
mance-tested at the factory. All applicable open and closed limit
switches have been set to actuate during opening and closing
of the valve. The Vogt AOV valve has been performance-tested
at a seat closure pressure of 110 percent of the design pressure
for which the actuator was designed. The as-shipped Vogt AOV
valve shall be installed and maintained in accordance with the
reference documents. The Vogt AOV 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 AOV valve.
2. Storage The Vogt AOV valve shall be stored in accordance
with the Short-Term and/or Long-Term Storage Procedures in
this manual. Refer to the Reference document #2 for any special
storage requirement unique to the valve actuator.
3. Welding Vogt AOV 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 open and
closed actuator limit switch settings that were set during
final performance testing by Flowserve. In the event the valve
operator is removed from the valve or the actuator is rotated on
the as-shipped valve, reset the limit switch to actuate when the
valve is fully open and fully closed. Removing the air actuator
from the Vogt AOV also violates the valve stem/actuator
coupling nut thread engagement and can cause the valve to
not fully close. The stem/actuator coupling nut final assembled
thread engagement geometry must be duplicated on reassembly
of the actuator to the valve, otherwise the valve will not fully
close when valve closure signal is given or the full thrust of the
actuator on the stem may damage the stem or actuator coupling
engagement threads.
5. Valve Stem/Actuator Coupling Nut Adjustment When the
actuator is removed from the valve, the closure mechanism of
the valve has been altered from the as-shipped condition. The
valve stem and coupling nut are designed to permit the stem
to be adjusted to ensure that the actuator actually preloads the
stem and closure mechanism on closure to ensure the valve
does not leak. In the event the actuator closes the valve but the
valve continues to pass flow, the stem needs to be lengthened
by adjusting the stem and/or the coupling nut in order to ensure
that the actuator has placed enough preload on the closure
mechanism, (spring force for fail-closed valves or air pressure
for fail-open valves) to seat the valve against the design pressure.
6. 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 Section 1 for the proper
gasket. For AOV gate valves, that are selectively assembled by
Flowserve, if the gate is removed from the AOV valve, place it
back on 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.
7. Valve Or Actuator Field Replacement In the event that the
valve is replaced or the valve actuator is interfaced with the Vogt
MOV valve at the field job site, set the open and closed limit
switches prior to operating. The open and close limit switch
setting procedure is typically done as follows:
a. Close Switch: Stroke the valve to the fully closed position by
application of an air supply for “spring-to-open” actuators.
With the air applied to the actuator, the close limit switch