| 摘要 |
The pump drive shaft may rotate in either direction. The pump discharges liquid from the same port, regardless of the direction of rotation. A receiving port on the pump mounting pad is aligned with that discharge port. The pump includes a base plate, a pump plate and a cover plate, aligned with a stack. The pump has a single inlet diametrically opposite the point where the gears mesh. This inlet acts in either direction of rotation so that no valves are needed in the inlet passage. Two outlet ports are located respectively on opposite sides of the mesh point. All fluid passages and a valve means which selects one outlet port or the other, depending on the direction of rotation, are located in the base plate. All valves are simple structures trapped in chambers between the base plate and the pump plate, or between the base plate and the mounting pad. The inlet is made narrower than the teeth on the gears to prevent cavitation.
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