Boleslaw Klimek - Des Plaines IL
The Berg Manufacturing Company - Des Plaines IL
A brake application valve is used to connect supply tanks to the front and rear brakes of a vehicle. The valve has a pair of shuttle members which normally close communication between the inlets and the outlets and open communication between the outlets and exhaust. There are two pistons, movement of which is effective to cause the shuttle members to open communication between the inlets and outlets and close communication to exhaust. One of the pistons (second piston) has inner and outer portions, with the inner portion being provided with a mechanical connection to the first piston such that movement of the first piston can cause movement of the second piston inner portion. The outer portion of the second piston is exposed to pressure at one outlet to cause movement of the second piston in response to air pressure at the first outlet. The opposite side of the second piston, both the inner and outer portions, is exposed to pressure at the second outlet such that the relationship between the exposed areas determines the relationship between the applied pressures at the first and second outlets.