Excellent stepless trimmer(wear compensation device),the flow meter can be calibrated positively and negatively for high accuracy and repeatability over a wide range, Constant flow is ultra-high precision, low maintenance, low wear, long      life, pressure loss is small, true gravity flowmrter, Measurement accuracy is not affected by temperature,      pressure and viscosity change. with differential pressure valve, to ensure liquid flow meter liquid gas, to ensure the measurement accuracy.