AH9000 Mobile Delivery Unit Tri-Block and QuadblockTest and Repair
Models AH9000 -001, -002, -004 and -005 have a Tri-Block. Model AH9000 -003 has a Quadblock.
The air/water supply for the syringe does not flow through the tri-block or quadblock.
The tri-block and quadblock are located under the lid of the delivery system.
It is a manifold that the air and water source travel through and is routed to different components in the delivery system. When the foot control is activated, air flows into the tri-block or quadblock through two tubes, one for coolant air and one for drive air. Coolant air flows from the tri-block or quadblock to each instrument manifold. Drive air flows through the adjustment valve on the tri-block or quadblock to each instrument. The tri-block or quadblock also supplies air to the air pressure gauge.
Water flows from the water relay valve through the tri-block or quadblock and to each water needle valve. The tri-block or quadblock has a membrane seal that provides a fluid-tight seal between the two walls. To access the membrane for repair, remove allen screws from the front of the block to separate the block. Also, Refer to: Access Procedures to access the block and to Tubing Diagrams of the tri-block or quadblock. Replacement kit for the membrane is available.
