CRANE Co.
280N MIDLAND AVENUE, STE.258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.avidcontrols.com
01/05/2018 TECH-537/ D.W.O. 23142 Page 9 of 21
Figure 2
Mounting for Shaft Option Namur Mount to Keystone 79U or MRP Actuators
4.2 Pneumatic piping:
Single Acting Actuator (Spring Return):
For single acting actuators Outlet Port 2 is to be plugged. Outlet Port 1 is to be piped to the
actuator inlet port that acts against the spring. (Increasing signal causes pressure to increase in
Outlet Port 1 of the positioner).
Double Acting Actuator (Double Return):
For double acting actuators Outlet Port 2 is piped to drive the actuator towards the fail
Position. Outlet Port 1 is piped to drive the actuator away from the fail position.
(Increasing Signal causes pressure to increase in Outlet Port 1 of the positioner and pressure to
Decrease in Outlet Port 2 of the positioner.
Namur
Actuator
Namur
Mounting
Bracket
Namur
Shaft
Remove Mod
Mount Bracket
to expose
Namur Shaft
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