| 摘要 |
<p>The pump device has a high-pressure pump (5), a low-pressure pump (6), a common electric submersible motor (7) and an oil-containing housing (4) with a recirculation connection (8) for connecting a recirculation line (9). A low pressure-switching valve (U) and a check valve (R) are arranged inside the housing from the valve combination (V) and are connected, so that the delivery rate of the pumps are united in the housing interior to a single discharge outlet (13) of the housing, at which the system pressure relief valve (DB) mounted outside the housing is connected.</p> |
