Emergency Pilot Valve
EMERGENCY PILOT VALVE
1. Piston. 2. Spring. 3. Control port from emergency
brake control valve. 4. Delivery port to double check
valve. 5. Exhaust passage. 6. Valve. 7. Supply port
from tractor reserve air reservoir.
The emergency pilot valve controls the flow of air
emergency brakes are activated. During normal
machine operation, air pressure is in control port (3).
This air pressure pushes up on piston (I) and puts spring
(2) in compression. Valve (6) comes in contact with the
valve body so that no air goes from supply port (7)
through deliver: port (4). There is no air pressure to
activate the emergency brakes.
When the emergency) brake control valve is
activated (pulled out), the air pressure in control port (3)
is released through the emergency brake control valve.
Spring (2) now pushes piston (I) down which pushes
valve (6) away from the valve body. Pressure air now
goes from supply port (7) and out delivery port (4) to the
double check valve and then to the tractor and scraper
brake chambers. The emergency brakes are now
Seat Air Suspension
Push on the control valve to increase shock ab-sorber
charge. Pull on the control valve to decrease shock
CONTROL VALVE FOR SEAT SUSPENSION