WO2016155751A1 PCT/EG2016/000010 EG2016000010W WO2016155751A1 WO 2016155751 A1 WO2016155751 A1 WO 2016155751A1 EG 2016000010 W EG2016000010 W EG 2016000010W WO 2016155751 A1 WO2016155751 A1 WO 2016155751A1 Authority WO WIPO (PCT) Prior art keywords poppet port pressure spool effect Prior art date 2015-04-02 Application number PCT/EG2016/000010