ADC AD-310 service manual

1.Speed Adjustment

The speed of the tilting action can be regulated by adjusting the set of flow control valves located on the pneumatic panel. Each set of cylinders, both front and rear, will have two (2) flow control valves. One valve will be the extend (up) air line and the other valve will be retract (down) air line. The speed of the cylinder is controlled by restricting the exhaust air flow from the cylinder. For example, if the front cylinders are extending, compressed air flows unrestricted into the cylinder causing the piston to move. The air being displaced (exhausted) from the opposite side of the cylinder can be restricted regulating the speed of extension.

2.Tilting Solenoid Valve

The dryer uses a 3-position / 4-way / 5-port, spring centering double solenoid valve. With no power applied to either solenoid, the valve is in a spring centered blocked post state. In this mode, the dryers' tilting pistons will remain in their present state, not being able to exhaust air or receive air. When the left solenoid is energized with 24 VAC, the pilot air pushes the shuttle to the right enabling air to flow into the #2 port and exhausts #4 port. On 2-Way Tilt models, this is dependent on a supply of external pilot air from the #4 port of the opposite solenoid valve. When the right solenoid of the valve is energized, air flows through the #4 port and the #2 port exhausts the pilot air, the right side of the valve is always internal pilot.

The tilting solenoid valve has two (2) mufflers. The air is exhausted through these mufflers thereby quieting the air flow.

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