Issue link: http://btb-marketing.uberflip.com/i/1462852
100 EUCLID SUSPENSION FIELD MANUAL Height control valve definitions ARM LENGTH For a valve to function in the optimum manner the arm length must match that of the OE application. Several valves have multiple holes in the arm for attaching the linkage which provides more flexibility and opportunities to match the OE design. • While a valve will operate with an arm length that is different than the OEM specification, it will not perform in the optimal manner. • Some valves have arms that can be removed and replaced. Barksdale valves have arms that should not be remove or replaced since this will alter the performance of the valve. DUMP FEATURE Dump valves can operate in one of two manners: • Dump valve opens when pressure is applied to the dump port. In this case the air line to the dump port is typically connected to a button located on the dash board. When activated by the driver, this provides the air pressure necessary to actuate the dump feature in the HCV and dump air to the air springs. • Dump valve opens when pressure is removed from the dump port. The dump port is on these valves is connected to the air brake system so when the brake pressure is dumped and the spring brakes are set, the dump feature in the HCV is actuated and it dumps air to the air springs. FITTING TYPES A number of fitting types are available to provide the connection to the air tubing. 1/4" NPT compression fittings and the newer Push to Connect (PTC) options are the most common. Not every HCV will be available with every fitting type so adapters can be used when necessary to provide the desired connection. LINKAGE All HCVs have some type of linkage that attaches the valve arm to the axle. Depending upon the application, the linkage can be a simple straight steel or aluminum shaft with ends which attach to the valve and axle or may be a more complicated design which may be required to avoid interference with nearby components. If the linkage is not damaged and a "like for like" HCV is available, then the linkage can often be reused. HEIGHT CONTROL VALVE DEFINITIONS