Flowserve Cast Flex Wedge Gate Valve - Manual (Page 12)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02
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4.0 OPERATING THE VALVE
(Continued)
4.2
Motor Actuated
4.2.1 The motor actuators on Anchor/Darling valves are adjusted for correct operation when shipped from the
plant. It should not be necessary to re-adjust the torque and limit switches when the valve is placed in operation
unless the actuator has been removed from the valve or the switch adjustments have been tampered with.
4.2.2 Adjustments of torque or limit switches should not be attempted without first consulting Anchor/Darling
Service Engineers. Failure to obtain proper authorization when resetting torque or limit switches may void the
warranty. Under no circumstances should the torque and/or limit switches be completely bypassed. They are
included to provide protection of the valve internals. Removal of their protection can cause extensive damage to the
equipment.
4.2.3 The valve is normally supplied with the torque switch wired to stop the operator in the closed position and
the limit switch wired to stop in the full open position. Using the torque switch to control travel in the opening direction
may damage the backseat. The valve should be backseated only by using the handwheel.
4.2.4 When powering the actuator for the first time, observe that the direction of rotation is correct. If not, the power
leads must be reversed.
4.2.5 Manual operation may be performed at any time by pulling the declutch lever downward. The lever will stay in
the manual mode until the electric motor is actuated whereupon it will automatically disengage.
4.3 Operating Tips
Do: Operate valves at least every 6 months.
Keep stem clean and lubricated.
Inspect valves regularly.
Lap seats promptly if valve leaks.
Use normal torque on handwheel.
Check packing regularly.
Do Not: Over tighten packing.
Torque-out motor operator against backseat.
Keep valve backseated during normal operation.
Keep gate valve in a partially open position for any length of time or use for throttling.
Bypass or reset torque or limit switches.
Use unauthorized operator assisters - pipe wrenches - cheaters.
Bring valve to fully backseated position immediately upon opening valve.
Allow 15 minutes for stem to cool before backseating valve.