Type 2
Description

Type 3
Description

Allen's Chip Detectors

Metal particles in the lubrication system of an aircraft engine or hydraulic system may be an indication of impending failure. Strategically located Chip Detectors can not only warn of failure, but aid in locating the failing part.

The design of the Chip Detector (Alnico magnet and stainless steel body) creates magnetic lines of force that cause the collected particles to bridge the electrically insulated air gap and complete the electrical circuit which can be monitored by maintenance personnel as a part of preflight or postflight maintenance. If preferred, the Chip Detector can be wired to a cockpit light for in-flight monitoring.

Available in threaded or bayonet designs, the valves close  down automatically as the magnetic plug or chip detector is removed. This eliminates the loss of expensive lubricants and reduces the need for clean up after inspection. As a result, inspection is faster and more convenient for maintenance personnel.

Both types of self closing valves offer maximum exposure  of the magnet to the flow of lubricant or hydraulic fluid. The wide open design is essential to proper functioning. If free flow is resricted, ferrous chips and particles are less likely to come is contact with the magnet.

Self closing valves are sealed with "O" rings, providing a positive seal under the low pressure condition generally associated with their application. The "O" rings seal the valve with the plug in position and when it is removed for inspection.