| 摘要 |
<p>A process for equalizing pressure of a flow stream across a valve, the process comprises providing a first process valve 19 having a flow stream of a process fluid with a first pressure on a pump side and a second pressure on a second side of the process valve 19, providing a pump 17 upstream from the pump side of the first process valve, where the pump comprises a floating piston 18 within a housing, one side of the floating piston 18 being in fluid connection with a non-abrasive fluid, providing a slave cylinder C containing a reciprocating piston 94 having one side in fluid connection with the flow stream of the process fluid downstream from the second side of the first process valve 19, the other side of the reciprocating piston 94 being in fluid connection with a first non-abrasive fluid line, arranging a needle valve 92 along the first non-abrasive fluid line between the pump 17 and the slave cylinder C, and actuating the needle valve 92 to permit flow of the non-abrasive fluid between the slave cylinder C and the pump 17 thereby equalizing the first pressure with the second pressure.</p> |
