10-15-2012, 06:19 PM
Ok, if I could point to the schematic this would be easier.
First, let's talk about the leveling valves. The travel solenoids isolate the HCV. Air supply pressure to the HCV does not come from the six pack. Air is supplied directly to the HCV and the HCV also exhausts directly. The six pack is BETWEEN the HCV and the air bags. You have to get that straight first.
Ok, on the single six pack setup, the tag bags see the same pressure as the drive bags as you can see from the schematic.
The solenoid valves for the tags are TWO way. Look at the schematic. When neither soleniod is activated the the air pressure goes straight through to the tags. When you flip the switch up to decrease pressure on the tag, the second solenoid valve in line changes position which isolates the tag pressure from the drive pressure, and the second solenoid in line changes position and exhausts pressure from the tag bag.
When the switch is pressed downward the first solenoid changes position and isolates the tag from the drive pressure, but it connects the tag pressure to line pressure. That way tag pressure is increased.
The three keys to understanding the schematic are:the HCV is between the six pack and the air bags, only two lines out of the six pack connect to the air bags (one for each side) and the other two lines connect to the HCV, and the solenoid valves for the tag are TWO way, not open and closed.
Clear as mud, right?
First, let's talk about the leveling valves. The travel solenoids isolate the HCV. Air supply pressure to the HCV does not come from the six pack. Air is supplied directly to the HCV and the HCV also exhausts directly. The six pack is BETWEEN the HCV and the air bags. You have to get that straight first.
Ok, on the single six pack setup, the tag bags see the same pressure as the drive bags as you can see from the schematic.
The solenoid valves for the tags are TWO way. Look at the schematic. When neither soleniod is activated the the air pressure goes straight through to the tags. When you flip the switch up to decrease pressure on the tag, the second solenoid valve in line changes position which isolates the tag pressure from the drive pressure, and the second solenoid in line changes position and exhausts pressure from the tag bag.
When the switch is pressed downward the first solenoid changes position and isolates the tag from the drive pressure, but it connects the tag pressure to line pressure. That way tag pressure is increased.
The three keys to understanding the schematic are:the HCV is between the six pack and the air bags, only two lines out of the six pack connect to the air bags (one for each side) and the other two lines connect to the HCV, and the solenoid valves for the tag are TWO way, not open and closed.
Clear as mud, right?
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)