Azbil AMT User Manual

Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
10
• HDT (Diverting) Type (Refer to Fig.4-4)
(1) Apply an air pressure to the diaphragm so that the pointer indicates slightly
below the position AB-A for direct acting actuator provided or indicates slightly
above the position AB-B for reverse acting actuator and hold it in either case so
that the valve plug do 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. When doing this, be careful not to drop the seating guide lest the seating
surface of valve plug B should be damaged.
(6) Remove the bottom nut on the valve plug and pull the valve plug downward.
Then pull down the seating guide.
(7) Remove the bonnet mounting nuts and pull out the bonnet by loosening the
gland packing flange nuts.
(8) Pull upward the valve plug A and the guide ring.
(9) To remove the seat ring, use the “special tool* for mounting and removing the
seat ring.”
*: Separately ordered.
Inspection
Inspect the disassembled parts for damage. If any damage is found, replace the parts.
(When ordering parts, mention also the Prod. No. of the valve which is indicated on
the nameplate.)
(1) Do not re-use the removed gland packing. Use fresh packing when assembling
the valve. (When assembling, a vacuum service valve, pay special attention to
the packing assembly method.)
(2) Check that the seating surfaces of plug, seat ring and cage are not damaged.
(3) Check that the gasket-contacting surfaces of valve body, bonnet and guide ring
cage are not damaged. Do not re-use the removed gasket. Use fresh gasket when
assembling the valve.
(4) Check that the plug guide section, the stem, and the guiding sections of guide
bushing, seat ring and seating guide are not damaged.
Assembly Procedure
• AMT (Diverting) Type (Refer to Figs. 4-1, 4-2, 4-3)
To assemble the valve, follow the disassembly procedure in the reverse order.
(1) To mount the seat ring, use the “special tool for mounting and removing the seat
ring.” (The tool is optional.)
For the tightening torques, see Table 4-1.
(2) Insert the valve plug (with valve stem mounted) from the tail piece side.
(3) Mount the seating guide and two gasket (one for 1” valve). (For 1” valve, seat
ring should be inserted in the tail piece in advance.)

Azbil AMT Specifications

General

Brand	Azbil
Model	AMT
Category	Control Unit
Language	English