Slowly unscrew bleed screw on SVB ( about three turns ).
慢慢放松关闭阀B上 的排气螺丝 ( 大约三圈 ).
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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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Kits consist of: Check assembly, O - ring, Spring, Vent O - ring Bleed screw O - ring and Retainer.
组件包括: 止回阀总成, O形环, 弹簧, 排气O形环,带孔螺钉O形环和护圈.
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