Flowserve Valtek VL-ES Actuators - Manual (Page 9)

9
Valtek VL-ES Actuators FCD VLENIM0114-00 – 09/06
flowserve.com
5.15 Install the positioner, tubing and other accessories. Use of an air filter is always recommended.
Use a soap solution to make sure all air connections are leak-free.
5.16 Install the maximum air supply pressure sticker and regulator if required.
NOTE: In some cases, air supply must be limited; this will be indicated by a sticker found near the upper
air port on the cylinder.
WARNING: To avoid personal injury or equipment damage, do not exceed the recommended supply
pressure.
5.17 Lower the actuator onto the valve body using lifting rings in place of two opposing cover plate
holes and install the yoke bolts finder tight. Replace the lifting lugs with the bolts and lock
washers using appropriate anti-seize. If the actuator uses a single piece stem clamp, this must be
put over the plug stem before the actuator is installed.
WARNING: When lifting an actuator with lifting straps through the yoke legs, be aware that the
center of gravity may be above the lifting point. Therefore, support must be given to prevent the
actuator from rotating, causing serious injury to personnel or damage to nearby equipment.
5.18 Most VL-ES actuators use a split stem clamp. This clamp comes in two pieces and has male
threads on the actuator and plug stem. One piece stem clamps have female threads in the
actuator stem.
5.19 For split stem clamps:
5.19.1 Make sure the plug is firmly seated into the seat ring. Using air, stroke the actuator stem
down until it is about 1 ⁄
8
" from the plug stem. Install the stem clamp and tighten. Stroke
the valve several times to align the actuator and plug stem. With the plug stem off the
seat, tighten the yoke bolts to finger tight.
5.19.2 Loosen the stem clamp to finger tight. Using the appropriate installation instructions,
adjust the plug stem position and tighten the stem clamp.
5.20 For one piece stem clamps:
5.20.1 With the actuator lowered onto the valve, the plug stem and actuator stem should be
touching. Before proceeding, verify the stem clamp is on the plug stem. The actuator
must be rotated to screw the actuator stem onto the plug stem. Rotate the actuator
down on the plug stem engaging the threads between the plug and actuator stem. Use
wrenches on the flats provided on the plug stem and actuator stem to turn the actuator.
Continue to turn the actuator on until the yoke contacts the bonnet.
5.20.2 Lift the stem clamp into place and tighten to finger tight.
5.21 Once the actuator is on the valve, the plug stem engagement into the actuator stem must be
adjusted. This adjustment is critical to shutoff and fail action.
5.22 Verify that the stem clamp is only finger tight. Verify that the yoke bolts are in place, but loosened
to a ¼ to ½ inch gap.
5.23 Using air on the actuator, lift the plug off the seat and adjust the plug as needed. Stroke the plug
down and watch for a gap where the yoke meets the bonnet. Continue to repeat this step until the
plug contacts the seat and lifts the actuator, making a gap between the yoke where it contacts the
bonnet of about
1 ⁄
16
".
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