BIFFI Morin Series A, B, C and S Scotch Yoke Actuators

Installation

The actuator can be mounted parallel or perpendicular to pipeline. The actuator can

be installed in any convenient position including vertical, horizontal or upside down.

1.Bolt mounting bracket to actuator hand tight. Do not tighten yet.

2.Install coupling on valve. Be sure rotary stops on valve are removed or

adjusted to allow actuator stops to do the stopping.

3.Install actuator and bracket to valve being sure to leave all fastener

connections hand tight. If possible, stroke valve and actuator to a half open

position 45° and physically shift actuator back and forth until coupling and

all fasteners are relaxed then tighten all bolts and nuts. This procedure will

accurately align valve stem to actuator output shaft and prolong valve stem

seal life. Lift the actuator at a balance point near the center housing. Do not

lift the weight of the valve, see Figure 1.

4.Cycle valve/actuator assembly and observe for smooth operation.

5.Adjust travel stops for perfect alignment in both open and closed positions.

NOTICE

If jackscrew override is installed, please refer to Section 3 for stroke adjustment.

6. Tubing connections – some models utilize two pistons for added power.

Spring-return (single-acting) dual cylinder designs require one “jumper”

to make the supply port common on both pistons. Double-acting (air to air)

dual cylinder designs require two “jumpers”. Refer to Figure 2 for

typical arrangement.