User Guide

Valves

Note:

When mounting an actuator onto a valve, observe the following:

• Allow 3” (76 mm) of clearance above the assembled actuator and valve for the removal

and reattachment of the actuator.

• Always install single-seat valves with pressure under the seat.

• Install all two-way valves so that they close against the flow. A tag or an arrow on the

valve body indicates proper flow direction.

• Always install three-way mixing valves with two inlets and one outlet.

• Always install three-way diverting valves with one inlet and two outlets.

• For steam applications only, mount the actuator above the valve body at 45° from the

vertical.

• MA-318, MA-416, MA-418, and MA-419 series actuators can be mounted in any

upright position above the centerline of the valve body. However, the output shaft must

lie in a horizontal position.

For detailed valve linkage installation instructions, refer to AV-390 Series, Valve Linkage

for Gear Train Actuators General Instructions, F-24376. Refer to Figure-5 for the

components of a typical valve installation of a standard actuator. For installing an actuator

with a hazardous location housing, refer to Figure-5.

Figure-5 Typical Components for Valve Installation of Standard Actuator.

Indicator Screw

Front Cover

Nylon Bushing

Actuator

Mounting Screws (3)

Mounting Bracket

Valve Body

(VB-7XXX Shown)

Plunger Assembly

Connecting Pin

Stem Extension

Stem Locknut

Packing Nut

Mounting Nut

Cover Screws (2)

Indicator

Plunger Cam

"C" Ring

1 Not included in AV Kits.

2 Used with 1/2" thru 1-1/4" valve bodies.