Manitowoc 3900W - Normally Closed

© 1996 Manitowoc Engineering Co.
Rev. 06-14-96 Folio 1307-1
SOLENOID VALVE
SERVICE INFORMATION
Table of
Contents
Operation
Normally Closed
(Figure 1)
Pressure is applied to inlet port “P”. With the valve deenergized, air at port “P” is
sealed off by the force of the plunger return spring and the seal in the plunger
assembly. Cylinder port “A” is open to exhaust port “E”.
When current is applied to the coil, the plunger assembly moves to open inlet port
“P” to cylinder port “A”. Exhaust port “E” is sealed off by the plunger assembly.
Normally open operation is just the opposite.
Air Line
Connection
The solenoid valve has three ports identified as follows:
P = Inlet from control valve.
A = Outlet to cylinder.
E = Exhaust.
For NORMALLY-CLOSED operation the air lines must be connected to the valve
ports as shown in Figure 1.
Operation..................................................................... 1
Normally Closed.................................................... 1
Air Line Connection......................................................1
Electrical Connection................................................... 2
Maintenance ................................................................2
Troubleshooting..................................................... 2
Disassembly..........................................................3
Reassembly...........................................................3
FIGURE 1
“
P
” (in)
“
A
”
(cylinder)
“
E
”
Normally Closed
(exhaust)
S126
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