Gear Pumps have a drain passage that is designed to remove fluid that has leaked into the seal pocket to drain back to the case drain so that pressure cannot build on the seal causing it to leak.
Pumps that are designed to be bi-directional have drain passages that drain to both the inlet and outlet connections and the passages have check valves installed so that the pressure drains to the low pressure connection and the high pressure from the outlet is blocked from entering the seal pocket.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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