以A型夹管阀为基础改进而来，这种锚链管道阀门坚固耐用，使用寿命长，并配置内置气动执行器的气动夹管阀。
Modeled after the original Type A pinch valve, the valve is a rugged, long-lasting, air-operated pinch valve with a built-in actuator.
焊接波纹管是近年来国内外兴起的一种新型元件，它有两突出的优点：变形量大，寿命长。
Welded bellows are a kind of new developed component, which have two prominent advantages: large transmogrification quantity and long duration.
塑料管具有耐腐蚀、不结垢、质量轻、使用寿命长等特点。
PVC-U plastic pipe has the character of corrosion resistance, no-scale, light weight and long service life.
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