Midmark® 1000 Tri-Block Test and Repair
Models 8000-002 and -004 have a Dual Block.
The air/water supply for the syringe does not flow through the tri-block.
The tri-block is located behind the delivery instruments.
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 through two tubes, one for coolant air and one for drive air. Coolant air flows from the tri-block to each instrument manifold. Drive air flows through the adjustment valve on the tri-block to each instrument. The tri-block also supplies air to the air pressure gauge.
Water flows from the water relay valve through the tri-block and to each water needle valve. The tri-block 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. Replacement kit for the membrane is available.
