4-1
Chapter 4. Disassembly and Assembly
This Chapter covers the disassembly and assembly procedures of the actuator for its overhaul
or modification.
4-1. Detaching actuator from valve body
See Figure 4-7.
(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 Figure 4-1 through Figure 4-6 and proceed
as described below.
(For handling of the bellows sealed type (optional type) of valves, see .)
Disassembly procedure
(1) Loosen the hex nuts of the packing flange.
(2) Remove the hex nuts (1) of the bonnet (extension bonnet).
(3) Raise and detach the bonnet from the valve body.
Precautions: If the valve plug comes out together with the bonnet, remove the plug from the
bonnet by rotating the plug. When doing this, exercise care not to damage the
valve stem.
(4) Model HTS, HPS and HAV Valve
For Model HTS and HPS valve, remove the guide ring. The seat ring is fixed to the valve
body by threading. To remove the seat ring, special tools (optional) are nec.essary.
(Model HLS, HLC valves have no guide ring and in its stead the valve has a guide hushing
pressed in the bonnet.)
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.
(2) Check that the seating surfaces of plug and seat ring are not damaged.
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