The quarter turn graduations on the sleeve, with the scribed line on the stem, provide for approximate flow measurement.
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。
2
Analyzing the actual research progress and targets, we can make a conclusion that Thermal Dissipation Method will be the vital techniques on stem SAP flow measurement and calculation in the future.