Metering Valve for Steering
METERING VALVE FOR STEERING
1. Shaft. 2. Spool. 3. Sleeve. 4. Outlet (to tank). 5. Inlet (for pump oil). 6. Pump gear. 7. Pump gear (internal). 8. Flat
springs. 9. Pin. 10. Opening to steering cylinders (left). 11. 0pening to steering cylinders (right). 12. Body. 13. Drove.
When the engine is running, the pump keeps the
cylinders. The oil from the cylinders goes through
pressure of the oil in inlet (5) at approximately 1825 psi
opening (10), passages in body ( 1 2), holes in sleeve
(128.3 kg cm2). The pump oil does not go through the
(3), grooves in spool (2) and through passages to outlet
metering Nvalve until the steering wheel is turned.
(4). The oil from outlet (4) goes to the tank.
The steering wheel is installed on shaft (1). When the
steering wheel is turned clockwise to make a right turn,
shaft (1) turns spool (2). After the spool turns a few
degrees, flat springs (8), in the spool, turn sleeve (3).
The spool and the sleeve turn, but they turn a few
degrees from being together. The pin (9), in spool (2),
turns drive (13) which turns pump gear (6) in pump gear
(7). Pump gear (7) does not turn.
When spool (2) moves before sleeve (3) is moved, the
holes in the sleeve get in line with grooves in the spool.
The pump oil in inlet (5) goes through the holes in the
sleeve into the grooves in the spool. The oil in the
PUMP GEARS IN METERING VALVE
grooves goes through other holes in the sleeve and
6. Pump gear. 7. Pump gear (internal). 9. Pin. 13.
through a passage in body (12). The oil from the
passage in the bode goes into pump gears (6) and (7).
When turning the steering wheel is stopped, most of
the parts connected to shaft (I) also stop. Flat springs (8)
As pump gear (6) is turned by drive (1 3), the oil is
now move the sleeve a few degrees in the same
moved to another passage in body (1 2), through more
direction that it was being turned. Now the holes in the
holes in the sleeve and other grooves in the spool, and
sleeve do not line up with the grooves in the spool and
through opening (11) to the steering
the flow of oil stops in inlet (5) of the metering valve.
When the steering wheel is not being turned, the oil
cannot get in or get out of the steering cylinders which
keeps the wheels positioned for a right turn.