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JJG311—83规程规定e值为0.005D≤e≤0.02D(D为节流件上游管道内径),在两点或多点上测得的e值之间的最大偏差不得超过0.001D。e是一个内尺寸(见图1),
JJG311-83 regulation provides e value of 0.005D≤e≤0.02D (D is upstream of the throttle pipe diameter), measured at two or more points, the maximum deviation between the e value of not more than 0.001D. e is an internal size (see Figure 1),