Smart Positioner
YT-3700 / 3750
Product Manual
Ver. 1.03
22
3.3
Linear positioner Installation
Linear positioner should be installed on linear motion valves such as globe or gate type which uses
spring return type diaphragm or piston actuators.
3.3.1
Linear positioner Installation of Standard lever type
Fig. 3-2: Installation of linear positioner example
Before proceeding with the installation, ensure following components are available.
➢
Positioner
➢
Feedback lever and lever spring
➢
M6 nut and spring washer (fastening feedback lever to a main shaft)
➢
Bracket, bolts and washers for positioner or sensor
– not supplied with the positioner
➢
Connection bar
– not supplied with the positioner
3.3.2
Safety
Proper bracket must be made in order to adapt the positioner on the actuator yoke.
Please consider following important points when a bracket is being designed.
➢
Positioner
’s feedback lever must be vertical to the valve stem at 50% of the valve stroke.
➢
The connection bar of the actuator clamp for the feedback lever should be installed in such a
way that the valve stroke length coincides with the corresponding figure in
“mm” marked on the
feedback lever. Improper setting may cause poor linearity
