套筒阀是六十年代发展起来的品种。它由套筒阀塞节流代替单双阀座的阀芯、阀座节流。
由引黄连接段工程引进的日本粟本铁工所设计、制造的淹没式多孔套筒阀，在国内为首次使用。
The exported relief valve with submerged perforated sleeve designed and manufactured by a Japanese company is used in the connecting section of YRDP for the first time in China.
在套筒上四分之一转的刻度，以及阀杆上的刻痕，显示大约的流量测量。
The quarter turn graduations on the sleeve, with the scribed line on the stem, provide for approximate flow measurement.
他们是真正的多用途阀采用专利的纽曼帝克阀芯和套筒组装。
They are true multi-purpose valves and employ the patented Numatics spool and sleeve assembly.
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