Abstract: Equipment for monitoring the performance of an engine fuel injector valve includes a source of pressurized fluid and an injector valve head connected to an injector valve and the source so that pressurized fluid is delivered to the valve. A regulator compensates for changes in pressure of the fluid and enables the change to be effected and maintained. A flow monitor is in the fluid path between the source and the head to monitor the flow of fluid. The source of pressurized fluid maintains a level of pressure in excess of a desired operating pressure. A fluid flow control coupled to a pressure sensor, near the test head indicates the pressure therein so that the flow control effects flow through the fluid path to maintain the pressure at the head.

Abstract: Monitoring equipment for monitoring the performance of an engine fuel injector valve. A source of pressurized fluid and an injector valve head are provided with connection means to enable an injector valve to be connected thereto, the head being connected to the said source so that pressurized fluid from the said source is delivered to the injector valve when the equipment is in use. Regulator means of the equipment compensate for changes in pressure of the fluid at the head owing to pulsed operation of the injector valve when the equipment is in use, as well as to enable a change in pressure to be effected and maintained at the head. Flow monitoring means are arranged in the fluid path between the said source and the head to monitor the flow of fluid to the head. The source of pressurized fluid is such as to maintain a level of pressure in excess of a desired operating pressure.