Azbil AMT - Disassembly and Assembly; Detaching Actuator from Valve Body; Disassembly and Assembly of Valve Body

Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
9
4. DISASSEMBLY AND ASSEMBLY
This section covers the disassembly and assembly procedures of the actuator for its
overhaul or modification.
4.1 Detaching Actuator from Valve Body
See Fig. 4-5.
(1) Apply to the actuator an air pressure so that the valve position pointer is at a
point of 10% - 20% above the fully closed point.
(2) Loosen the clamping-bolts of the stem connector, remove the stem connector,
and detach the actuator stem from the valve stem.
(3) Remove the clamping-nut of the yoke.
(4) Raise the actuator to detach it from the valve body.
Precautions: For detaching the actuator from the valve body which is kept installed
in the process pipe, be sure to shut down the process for and release the
process pressure before detaching the actuator.
4.2 Disassembly and Assembly of Valve Body
To disassemble or assemble the valve body, refer to Fig. 4-1 through 4-4 and
proceed as described below.
Disassembly Procedure
• AMT (Mixing) Type (Refer to Fig.4-1, 4-2, 4-3)
(1) Apply an air pressure to the diaphragm so that the pointer indicates slightly
below the position AB-B for direct acting actuator provided or indicates slightly
above the position AB-A for reverse acting actuator and hold it in either case so
that the valve plug does not touch the seat ring.
(2) Remove the stem connector to separate the actuator stem from the valve stem.
(3) Release an air pressure from the diaphragm and disconnect the air piping.
(4) Remove the yoke nut by turning it with a chisel and detach (pull up) the actuator
from the valve body.
(5) Remove the tail piece from the valve body by loosening the bottom nuts on the
body.
(6) Pull down the seating guide from the valve body. However, for 1” valve,
unscrew and remove the seat ring from the tail piece as required.
(7) Loosen the gland packing flange nuts and remove the valve plug from the
bottom of the valve body.
(8) Remove the bonnet assembling nuts and pull out the bonnet.
(9) To remove the seat ring, use the “special tool* for mounting and removing the
seat ring.”
*: Separately ordered.