Emerson Fisher 3024C Manual de instruções - Página 9
Procurar online ou descarregar pdf Manual de instruções para Equipamento industrial Emerson Fisher 3024C. Emerson Fisher 3024C 20 páginas. Diaphragm actuator
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D103048X012
2. Bypass the control valve. For a top‐loaded 3024C Air‐to‐Close actuator, reduce the diaphragm air pressure to zero
and remove the piping or tubing from the connection in the upper diaphragm casing (key 16). For a bottom loaded
3024C Air‐to‐Open, apply air pressure to the diaphragm to open the valve.
Note
When disassembling the stem connector on Air‐to‐Open constructions, it is essential to apply enough air pressure to the underside
of the diaphragm to lift the valve plug off its seat. This will ensure that all residual spring compression in the actuator is supported
while the stem connector is removed.
3. Undo the stem connector by first slackening the valve stem locknuts and then removing the socket bolts.
4. Undo the yoke locknut on the valve bonnet and carefully lift the actuator off the valve. As you undo the yoke
locknut, ensure that the actuator is properly supported. If the actuator is a bottom loaded Air‐to‐Open type, reduce
the diaphragm pressure to zero and remove the piping or tubing from the connection in the lower diaphragm
casing (key 1).
5. Slightly loosen all diaphragm casing cap screws (key 19 and 21). Remove the plastic hose (key 22). Unscrew the
short and long diaphragm casing cap screws and nuts (keys 19, 20 and 21) alternately, until only the long casing cap
screws (key 21) remain engaged. Then allow the remaining spring compression to be slowly released by alternately
unscrewing the long casing cap screws.
6. When removing the diaphragm and actuator springs perform one of the following procedures as appropriate:
For a 3024C Air‐to‐Open Actuator (figure 9)
a. Lift off the upper diaphragm casing (key 16), the casing spacer (key 29) and seal ring (key 30) if fitted (see figure
13), and remove the springs (Key 15).
b. Using a strap wrench or soft‐jawed vice, hold the actuator stem (key 8) and remove the travel stop nut (key14).
c. Remove the diaphragm plate (key 13), diaphragm (key 11), O‐Ring (key 12), pressure plate (key10) and the split
ring halves (key 9).
For a 3024C Air‐to‐Close Actuator (figure 8)
a. Lift off the upper diaphragm casing (key 16) and casing spacer (key 29) and seal ring (key 30) if fitted (see figure
13).
b. Using a strap wrench or soft‐jawed vice, hold the actuator stem (key 8) and remove the travel stop nut (key14).
c. Remove the pressure plate (key 10), O‐ring (key 12), diaphragm (key 11), diaphragm plate (key 13) and the split
ring halves (key 9).
7. Carefully slide the actuator stem (key 8) out of the bottom of the lower diaphragm casing (key 1) and set it on a
protective surface to prevent damage to the O‐ring sealing surface.
8. Remove the bellows (key 31), if used.
9. Unscrew the cheese head screws (key 7), then remove the bushing (key 6).
10. With the actuator disassembled, inspect all parts for excessive wear and replace as necessary.
Assembly
This procedure assumes that the actuator is completely disassembled. If it is not, start the instructions at the
appropriate step.
3024C Actuator
June 2023
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