12
YT-3400/3450 series
3.3
YT-3400/3450R Installation
YT-3400/3450R should be installed on rotary motion valve such as ball or butterfly type
which uses rack and pinion, scotch yoke or other type of actuators which stem rotates 90
degrees. Before proceeding with the installation, ensure following components are
available.
Positioner unit
Fork lever and lever spring
Standard rotary bracket (included with the positioner)
4 pcs x hexagonal headed bolts (M8 x 1.25P)
4 pcs x M8 plate washer
Fig. 5: Fork lever type (left) and NAMUR lever type (right)
3.3.1
Bracket information
Standard bracket (included with the positioner) contains two components. The bracket can
be used for both fork lever and NAMUR lever type. The bracket is designed to fit onto the
actuator with 20mm stem height (H). If actuator’s stem height (H) is 30mm or 50mm,
bracket must be adjusted. Please refer to below table how to adjust the bracket.
Actuator stem
height (H)
Markings of bolt holes
A-L
B-L
A-R
B-R
20mm
H : 20
H : 20, 30
H : 20
H : 20, 30
30mm
H : 30
H : 20, 30
H : 30
H : 20, 30
50mm
H : 50
H : 50
H : 50
H : 50
