| 摘要 |
A pump unit has piston pump connected to suction and pressure mains, back valve installed in pressure mains equipped with element for connection to unit for well sealing. In suction mains controlled block for liquid supply to piston pump is installed. In pressure mains between the pump and main back valve additional back valve is installed. Between the main and additional back valves discharge is installed, this is connected to controlled block for liquid supply, and pneumatic hydro-accumulator.
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