M Motor Actuators
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Y20EBD Valve Linkage for M100 Motor Actuators 21
Three way valves, mixing or diverting, can be assembled so that the upper
seat is initially closed (stem up) or so that the lower seat is initially closed
(stem down). Stem up or stem down operation is determined by the yoke
configuration and position of the rack and gear housing. Travel
adjustments are similar for either case and require both upper and lower
limits to be set. Both mixing and diverting 3-way valves are adjusted the
same way.
1. Power the actuator to position the drive shaft 15° from zero. This is
equivalent to 0.1 inch of stem travel.
2. Manually position the rack to the full stem up or stem down position
as required.
3. Insert the pinion gear into the gear housing with the square hole over
the actuator shaft.
4. Replace the gear cover and screws.
Upper Valve Seat
(3-way Valves)
Valve Plug
Lower Valve
Seat (2-way and
3-way Valves)
Upper
Visual Guide
For Lower
Seat Close Off
Lower
Visual Guide
For Upper
Seat Close Off
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. . . .
Modulating Lower Seat Closed Upper Seat Closed
Figure 21: Linkage Adjustment Stem Up 3-Way Valve
5. Allow the actuator to return to the zero position. The flat washer
should align with the notch at the bottom of the spring case for stem
up valves or with the upper notch for stem down valves. This
indicates valve seating at the zero position.
6. Refer to the technical bulletin provided with the motor actuator and
adjust the travel to fully stroke the valve and compress the over travel
spring at full lift. The washer should be aligned with the notch
opposite the starting point.
7. Figure 21 illustrates the over travel indication for seating stem up
3-way valves.
Three Way Valves
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