Mounting Rotary Actuators On Valtek Valve Bodies; Adjusting External Stroke Stops - Flowserve Valtek VR User Instructions

 Install splined lever arm into transfer case through cover
plate/yoke openings.
 Slide actuator stem through the top opening of transfer case
and connect to the splined lever arm with the pivot pin and
two retaining rings.
 If the yoke/cover plate bearings were removed, press new
bearings into the yoke and cover plate using a press and
arbor.
 Firmly tighten clamp bolt on splined lever arm.
 Install cover plate and yoke onto transfer case. The four
tapered lug bolts are used with the yoke and standard hex
bolts are used with the cover plate.
 Install base slider O-ring into sliding seal groove machined in
the transfer case.
 Install actuator stem O-ring into the sliding seal collar. Then
slide the collar over the actuator stem.
 Place retaining washer over the collar and install the spiral
retaining ring into the transfer case.
 Replace the piston O-ring and piston backup ring onto
piston, make sure the piston backup ring is on top (toward
the top of cylinder) of the piston O-ring.
200 square-inch actuators use two piston
backup rings. They are placed on each side
of the piston O-ring.

Install the piston stem O-ring and piston on to the
actuator stem.

Install the spring guide (VR50, VR100, and VR200 square
inch actuators only) and actuator stem locknut onto the
actuator stem. Tighten the actuator stem locknut firmly.

Install the cylinder O-ring into transfer case groove.
Replace cylinder O-ring if damaged.

Install the spring and spring button.

Lightly lubricate the lower half of the cylinder bore with O-
ring grease and slide cylinder down over piston and
transfer case.
The cylinder must be perpendicular with
the piston when sliding it over the
piston O-ring.

Reinsert the cylinder retaining ring in the cylinder by feeding it
a little at a time into the groove. Make sure it is securely
fastened.
VLAIM031-14 (EN/AQ) May 2023
Valtek VR Spring Cylinder Rotary Actuators
Ensure that the cylinder retaining ring is
completely seated in the cylinder groove,
else serious personnel injury may occur.

Center the hole in the spring button directly under the
adjusting screw hole. Install the adjusting screw and tighten
only enough to provide an air seal with the gasket. Do not
overtighten.

If actuator is to be used with a positioner, mount positioner
and connect tubing.
13.2 Mounting Rotary Actuators on Valtek Valve
Bodies
The actuator cover plate and yoke must
be installed prior to stroking the actuator
otherwise it will result in damage.
When mounting a rotary actuator to a Valtek valve body, refer to
Installation, Operation, Maintenance Instructions in the case of
Valdisk, ShearStream or MaxFlo valves. When mounting a rotary
actuator on other manufacturers valve bodies, refer to the
appropriate literature.
When mounting an actuator with splined lever arm, firmly tighten
the clamping bolt on the splined lever arm. Re-install the cover
plate and tighten the four bolts firmly.

13.3 Adjusting External Stroke Stops

After disassembly and reassembly, it is necessary to readjust the
external stroke stops to avoid valve leakage. The external stroke
stops should be adjusted while the valve is out of line. To adjust
the external stroke stops, proceed as follows:
Actuators with splined lever arms must be
attached
mechanical device and the transfer cover plate must be
installed prior to stroking the actuator, else it will result in
damage.

Cycle the valve (else mechanical device) to just beyond the
closed position with very low supply air pressure (10-15 psi).

Turn the stroke stop in clockwise (as viewed from the end)
until resistance is felt. Turn the stroke stop an additional 1/8
of turn. Check to see that the valve is closed on dead center.
If not, adjust the stop until the valve is closed on dead center.

Cycle the valve open. Adjust the other stroke stop until
valve is 90 degrees from the closed position.

Cycle the valve several times to make certain the position
to a valve else other
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