Maintenance - Fisher A41 Instruction Manual

Figure 4. Flow Direction
RETAINER RING SIDE
FLOW ARROW
ARROW SHOWS PREFERRED FLOW DIRECTION FOR SOFT SEALS AND NPS 2 METAL SEAL
FORWARD FLOW
FORWARD
FLOW
NOTES:
1. BY EMERSON PROCESS MANAGEMENT DEFINITION:
D FORWARD FLOW IS INTO THE FACE SIDE OF THE DISC.
D REVERSE FLOW IS INTO THE HUB SIDE OF THE DISC.
75B1181-A
A6881-2

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions. Instructions are given in this section for replacing
packing, seal ring, disc, shaft, bearings, and other valve parts. Also, instructions are provided for changing valve action,
mounting, and adjusting the actuator. Refer to the actuator instruction manual for additional information for
mounting and adjusting the actuator.
MFG LABEL
FLOW ARROW
ARROW SHOWS FLOW DIRECTION FOR NOVEX METAL SEAL, AND PREFERRED
FLOW DIRECTION FOR PHOENIX METAL SEAL
RETAINER RING SIDE
REVERSE FLOW
REVERSE
FLOW
FACE SIDE OF DISC
MFG LABEL
9