Instruction Manual
D104138X012
D2T FloPro Valve
June 2017
9
3. Unscrew the bonnet from the valve body.
WARNING
Avoid personal injury from sudden release of process pressure. If the process media starts to escape from the safety vent
(see figure 2) located in the bonnet neck of the valve body,
STOP DISASSEMBLY IMMEDIATELY!
The escape of process media indicates that the valve has NOT been isolated from the process media, or process pressure is
trapped in the valve body.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
4. Once the bonnet has been removed from the valve body, inspect the valve seat (key 5) for wear or damage. If the
seating surface has been damaged, remove it from the valve body. Also remove the seat ring gasket (key 6). Clean
and inspect the valve body gasket surface for damage. Visually inspect the valve body interior below the seat ring
for erosion. Replace the valve body if necessary.
To replace the seat ring, first install a new seat ring gasket. Install the new seat ring and tighten to 230 N
S
m (170
lbf
S
ft).
Cover the opening in the valve body to prevent foreign material from getting into the valve body cavity.
WARNING
To prevent possible personal injury or property damage from removing the casing cap screws in the wrong sequence,
follow the procedure as outlined below for removing the upper casing.
5. Remove the six
short
actuator casing cap screws (key 22) first. Once these have been removed from the actuator
assembly, remove the two
long
actuator cap screws (key 30) by alternating between them as you loosen them, to
keep the upper casing (key 21) level during this procedure.
Note
Be aware as you loosen and remove the actuator cap screws that the actuator springs are under compression for the air‐to‐open
configuration.
6. Remove the upper casing (key 21) and the springs (key 27).
7. Do not turn the valve stem (key 4) while removing the diaphragm hex nut (key 26). Keep the stem from turning by
using an open end wrench on the machined flats located on the valve stem above the flow adjuster for this
procedure. Continue the actuator disassembly by removing these parts: washer (key 24) diaphragm plate (key 25),
diaphragm (key 19), washer (key 36), and O‐ring (key 37). Inspect the diaphragm for any wear or damage. Replace
with a new one if necessary.
If you wish to inspect/replace the bonnet to actuator casing O‐ring (key 16), mark the orientation of the actuator
pressure connection to the bonnet for later reference (see figure 3). Unscrew the hex nut (key 18) from the bonnet.
Remove the bottom casing (key 20).
8. Unscrew the flow adjuster socket head cap screws (key 29), and remove the flow adjuster halves.