sprague type wipers

[zubzub]

The PO of my bus tried to run the sprague wipers motors with trico control valves.....As a result the system was all disconnected/inoperable.  I bypassed everything and voila the wiper motors work great and park themselves when the air is turned off.  Excellent!  So now I need control valves for this.  Basically with incoming air regulated at 85 psi the valve needs to regulate the volume from 0 to full flow.  1.Is this a common valve?  2.Will I find them on 80-90s transits?

[zubzub]

bump

[Tom Y]

Do the Trico valves not control air volume? The volume should control speed, presure controls power.  Tom Y

[zubzub]

trico valves are seem weird balance the air volume against the park volume, the wiper max speed is adjusted at the valve.   Spragues adjust max speed at the exhaust of wiper motor.