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壓力儀表標(biāo)準(zhǔn)精選(最新) G1226《GB/T 1226-2010 一般壓力表》 G1227《GB/T 1227-2010 精密壓力表》 G8892《GB/T 8892-2005 壓力表用銅合金管》 G17764《GB/T 17764-2008 密度計的結(jié)構(gòu)和校準(zhǔn)原則》 G22052《GB/T 22052-2008 用液體蒸氣壓力計測定液體的蒸氣壓力 溫度關(guān)系和 初始分解溫度的方法》 G25112《GB/T 25112-2010 焊接、切割及類似工藝用壓力表》 G26787《GB 26787-2011 焊接、切割及類似工藝用管路減壓器安全規(guī)范》 G26788《GB 26788-2011 彈性式壓力儀表通用安全規(guī)范》 G27504《GB/T 27504-2011 壓力表誤差表》 G27505《GB/T 27505-2011 壓力控制器》 G30432《GB/T 3043
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Dead weight testers are used for examination and calibration of pressure gauges and other pressure measuring instruments without using an external instrument. The main components are the measuring system, the valve units, the built-in screw pump for accurate pressure adjustment and the set of weights. The measuring system itself consists of a precise lapped-in pair of piston and cylinder. Dur