The H-2-X Type Controlair Valves are handle operated 4-way, exhausted center, pressure control valves.
The typical unit contains two directional control 3-way side valves and a pressure graduating portion that is arranged to increase, decrease or maintain air pressure to a separate delivery line. In neutral position, both 3-way side valves exhaust both delivery lines. A movement of 10 degrees either side of center position opens the appropriate side valve and directs pressure to the indicated outlet port. Continued movement past 10 degrees up to full travel, or 46 degrees either side of neutral continues to actuate the pressure graduating portion to deliver a graduated pressure according to the valve of the control spring.
Models
There are six models with similar valve functions, but different handle operating characteristics.
HD-2-X Controlair Valve -Handle is spring returned to neutral position from all positions in the handle travel. Some special models exist. See notes on Identity schedule on page 7.
HD-2-LX Controlair Valve – Handle is spring returned to neutral position from all positions except at the maximum pressure setting on both sides of center. The handle is held in both extreme positions by a mechanical detent.
HD-2-FX Controlair Valve – Handle is equipped with a friction brake that will hold the handle in any position selected in the handle travel.
HD-2-XS Controlair Valve – Handle detents in both maximum pressure positions. The handle is spring returned to neutral position from all other positions in the handle travel. Graduated pressure to port (8) is only delivered in one direction of the handle movement.
HD-2-FXR Controlair Valve – Handle function is similar to the HD-2-FX Valve. The difference is the two directional valves are supplied instead of being exhausted when the handle is in the neal position,
HD-2-LS Controlair Valve– Handle holds in full travel, neutral and detent positions.
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