Flowserve MX Accutronix User Manual download pdf (Page 11)

11Accutronix MX Quick Mounting Instructions • LMENIM2312

Flow Control

Limitorque Actuation Systems

3. Machine the stem nut to suit the valve stem. Ensure sufficient

clearance to avoid unnecessary wear and heating during operation.

Reassembly – Unit MX-140

Refer to the figure on page 10.

1. Clean the stem nut, washers, and bearing(s) thoroughly.

2. Slide second set of thrust washers and bearing in place if removed.

3. Install stem nut.

4. Install first set of thrust washers and bearing.

NOTE: Order of assembly for thrust washers and bearing must be as

follows: washer, thrust bearing, washer.

Pilot installation

Slide pilot into thrust base assembly and secure with the two washers

and screws. Tighten fully.

Type “BL” Drive: Splined-drive Applications

(Not applicable for MX-85 or -140)

Steel alloy splined nuts are provided to a standard involute spline

category for rising and rotating stem valves per customer requirements.

Disassembly and reassembly is the same as the B4 base and the torque

nut. See Type “B” Bases: Torque-only Applications section.

Mechanical Installation of MX

Actuator onto Valve or Gearbox

NOTE: Refer to LMAIM2314, MX Maintenance and Spare Parts for

more detailed instructions.

Before installing the actuator onto a valve or gearbox, check the

following to ease installation:

• Verify mounting flange is suited dimensionally to mate with the

actuator base. Ensure that it is perpendicular to the valve stem or

gearbox input shaft.

• Ensure the stem nut mates with the valve stem or input shaft. For

screwed nuts, it is advisable to run the stem nut down the entire length

of the stem to check for tightness. Keyed or splined shafts should

exhibit a smooth, sliding fit with the key installed.

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Flowserve MX Accutronix User Manual Page 11