Badger Meter SRD/SRI Valve Positioners - Manual (Page 30)

Mounting to Rotary Actuators
Applicable to rotary actuators that meet the VDI/VDE 3845 standard for mounting Installation position of positioner: Mount
the positioner so that the pneumatic connections are in the same direction as the longitudinal drive axis of the actuator as
shown in the photograph below
Figure 14: Mounting to rotary actuator
The feedback shaft 9 of the SRD has no mechanical stop, therefore may spin 360° The permissible rotation angle
range is between 50…–50° around the arrow at the housing concerning the flat area of the feedback shaft (also see
“Mounting Dimensions for Direct Mounting” bottom) Since a rotary actuator has a rotary angle of about 90°, the mounting as
described in the following must be carried out very precisely
Attachment of the positioner to the actuator is made by using the rotary adaptor kit EBZG -R
Either the side outputs I (or I and II) are used and the rear output I is closed by means of the lock screw 522 588 013
Pneumatic connections: Do not use Teflon tape for sealant The fine fibers could disturb the function of the SRD Apply only
Loctite® #243 sealant to the male thread
Screw-type glands for electrical connections are used as needed Any unused threaded holes are closed by plugs
PREVENT ACCUMULATION OF WATER IN THE INSTRUMENT IN THIS MOUNTING POSITION BY SEALING CABLE ENTRY
AGAINST WATER. PROVIDE A CONTINUOUS SUPPLY OF DRY INSTRUMENT AIR.
Preparing the Positioner
Valve must be in failsafe position and the direction of rotation of the actuator drive shaft must be known These items are
extremely important for proper functioning These items can be checked as follows in case they are not clear:
• In the single-acting actuator the force of the installed spring closes The pressure-less actuator is in failsafe position
Through manually feeding compressed air it can be seen whether the actuator drive shaft rotates to the left or to the right
• In the double-acting actuator (without spring reset) both air chambers are basically equal Failsafe position can be either
“open” or “close” Therefore, indication of the failsafe position has to be determined by engineering Then the direction of
rotation may be determined by manual feeding of compressed air
Bolt 2 is screwed into actuator drive shaft 1 for subsequent centering of the rotary adaptor 3 The attachment console is
mounted to the stroke actuator (see illustration)
Mounting to Actuators
Page 30 August 2014 POS-UM-00010-EN-03