KOBOLD 粘度补偿型带玻璃视窗的金属转子流量控制器VKGpdf,KOBOLD 粘度补偿型带玻璃视窗的金属转子流量控制器VKGViscosity-Compensated Flow Meters and Switches Model VKG OBOLD Four versions VKG-1 VKG-2 Flow meters Flow meters and switches with 1 contact VKG-3 VKG-4 Flow meters and switches Flow met