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80174964_ed1
Description
The RR250-F30 includes valve and regulator functions.
The RR250 is made of three main components:
1. The master regulator which sets the pilot pressure.
2. The solenoid valve which will open or close the system
when the operator actuates the switch key.
3. The slave regulator which is the main body.
(Dwg. 80177892)
The slave regulator (3) will receive the signal from the master
regulator (1) through the solenoid valve (Fig 2). For
pre-engage Starters (Fig 1) the signal pressure will come
from the master regulator through the solenoid valve to the
pilot “In” port of the air starter drive housing, giving the signal
to engage the drive pinion into the ring gear. After engaging
the drive pinion it will come out through the “Out” port of the
drive housing and will go to the top cover of the slave
regulator.
(Dwg. 80177900)
The Slave regulator using the pressure signal on top of the
diaphragm will force the piston off its seat. That allows air to
flow into control chamber below the diaphragm, through the
outlet port of the RR250 valve to the starter motor. Outlet
pressure increases in the downstream system and sensing
chamber (under the diaphragm) and applies an upward force
on the bottom of the diaphragm. The diaphragm and piston
move upward. Upward movement stops when the forces
below the diaphragm balance the force above the
diaphragm.
(Dwg. 80177959)
(Dwg. 80177991)
2
3
1
Figure 1
Figure 2