Directional Couplers are passive devices used in the field of radio technology. These can be used in sampling incident and reflected microwave power and with minimal disturbance to the transmission line. These are also used in monitoring, power measurements and load source isolator applications.
Directional drilling is the science of drilling non-vertical wells. Directional drilling can be broken down into three main groups: oilfield directional drilling, utility installation directional drilling and in-seam directional drilling (coal-bed methane). The directional well has the ability of the bit to move laterally is used to have the hole curve along a predetermined path. Directional drilling is used to deflect up-structure in faulted areas, to avoid water, to improve well production and to include multiple exploration wells from a single well bore.
Directional valves are used for controlling the start, stop, and direction of fluid flow in a circuit. It can be designed as direct and pilot operated designs. It is available with both AC and DC voltage solenoids. These valves consist of housing, one or two solenoids, control spool and return springs.