| 摘要 |
Apparatus for testing a solenoid-actuated, hydraulic valve under actual operating conditions in a closed hydraulic system includes two pressure gauges to monitor valve switching pressure as well as electrical control switches and a test lead to power the valve. A closed hydraulic system includes a reservoir, a pump and a needle valve for controlling pressure. With the hydraulic valve de-energized, flow of the hydraulic fluid is in a first direction, with a first pressure gauge indicating the internal hydraulic pressure and a second hydraulic gauge indicating zero pressure. When the valve is energized, fluid flow direction is reversed in the system and the second hydraulic gauge now measures a pressure, with the first hydraulic gauge indicating zero pressure. Operation of the electrically actuated hydraulic valve can be tested under actual operating conditions prior to installation in a hydraulic control system. The apparatus includes means for permitting various sizes and configurations of hydraulic solenoid valves to be tested.
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