When dripping from bleed screw stops and PSID needle on gauge stabilizes, record the differential pressure.
当从排气螺丝上的滴漏停止时,仪表上的PSID指针稳定下来, 则记录压差.
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Slowly open VA and lower high side pressure about side pressure ( differential reading about - 2.0 psid ).
缓慢开启VA, 高端压力比低端压力降低2psid左右 ( 不同读数大约在2.0psid左右 ).
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