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Instruction Manual

D103302X012

A81 Valve

May 2011

1. If new bearings (key 6) are required, install and orient them in the valve body, as shown in figure 5. Ensure the

bearings are fully seated, contacting the inside diameter of the valve body.

2. Insert the disk into the valve body as shown in figure 6, ensuring the “T” stamped on the disk hub is oriented toward

the actuator end of the valve body.

3. Install the drive shaft (key 10) through the valve body into the disk. The disk/shaft connection utilizes taper and

expansion pins. The hole for the drive shaft connection is slightly off‐center to prevent the drive shaft from being

installed in the wrong orientation. Orient the position indication mark on the end of the shaft with the face of the

disk as shown in figure 7. The hole for the follower shaft connection is on‐center. Insert the expansion pins into the

disk until they are seated, as shown in figure 6. Once in place, insert the taper pins. The taper pins must be driven

into the disk/shaft/expansion pin assemblies until “solid contact” is felt. “Solid contact” can be identified by the

sound of the hammer blow and the bounce felt in the hammer.

4. Reinstall the follower spring/spring seat assembly (keys 9, 12, and 9, figure 8) inside the follower shaft.

5. Install the spacer (key 15) if used, and the gasket, blind flange, and hex nuts (keys 16, 17, and 19). Ensure the blind

flange is oriented so the serrations face the gasket and valve body. Tighten the hex nuts (key 19) per table 7.

6. The valve must be closed during seal ring installation to permit accurate centering of the seal. To install the new

seal ring assembly or flow ring:

Table 8. Recommended Actuator‐Mounting Bolt Torque

VALVE SIZE TORQUE

DN NPS NSm lbfSft.

50, 80, 100, and 150 2, 3, 4, and 6 120 88

200, 250, and 300 8, 10, and 12 250 185

D For a soft seal, if the spring (key 5) was disassembled, hook the spring ends together. Work the spring into the

recess in the seal ring (key 4). Place the seal ring assembly onto the disk. Set the retainer onto the seal, making sure

proper alignment between the seal and retainer has been achieved.

D For the metal seal ring assembly, place the seal ring assembly onto the disk. Set the retainer onto the seal.

D For the flow ring construction, place the gasket (key 41) onto the valve body. Set the retainer onto the gasket.

7. Attach the seal retainer (key 2) and the retainer clips (key 13) to the valve body and secure with the machine screws

(key 14).

8. Insert a packing box ring (key 23) into the packing box.

9. For standard packing, install the packing according to the appropriate instructions presented in step 5 of the

Replacing Packing section on page 11 of this manual. For ENVIRO‐SEAL packing, install the new packing system

components as described in the ENVIRO‐SEAL Packing System for Rotary Valves Instruction Manual

(D101643X012).

10. Install the anti‐blowout ring (key 40) in the groove in the drive shaft.

11. Rotate the disk to the approximate closed position.

12. Mount and adjust the actuator per the following Actuator Mounting section on page 18 of this manual.

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Emerson A81 Bedienerhandbuch Seite 17