How to choose a polyurethane metering pump: 
 "Pump": metering pump most of the selected dosing pumps (gear metering pumps), the measurement of high accuracy requirements should be used in low-speed high-precision, high pressure, high temperature of the gear pump (pump speed is low on the manufacturing precision of the required pump high, or leakage of fluids and measurement of the elephant, such as a conventional gear pump does not work when speed <50r/min). Zentih polyurethane pump speed range 1 to 250 r / min adjustable, prolong life and improve sealing speed is low. The accuracy of the measurement is not only determined by the metering pump, 
 Buy polyurethane pump, air tightness, no leakage "high precision" pulse "," repeat performance "is an important consideration indicators. 
 Zenith Pumps polyurethane pump how to do the "high precision", "no pulse", "repeat performance" 
 Rational design of: 
 From the rationality of the design: the pump has only three moving parts, the main drive shaft, drive gear, driven gear (no bearings, bushings). 
 "Repeat performance" 
 Two gears and shafts hardened, hardness up to Rc54, to ensure a good wear resistance, long-term use also can achieve high precision. 
 "High precision" 
 Must reach a certain high precision, high volumetric efficiency of the pump must be done, how to achieve high volumetric efficiency? 
 Rationality of the design must first be re-processing of high precision, Zenith, Pumps polyurethane pump (B-9000 series of 2.4 ml / rotation for example) of gear and cavity gap of 0.005 inch, but at the same time after hardening to ensure that in 340 degrees Celsius, not due to thermal expansion and contraction of the physical properties of the gear expansion card dead. 
 Output pulse " 
 Zenith, Pumps polyurethane pump (B-9000 series of 2.4 ml / rev for example) to 2.4 ml 360-degree turn, the two gears, the number of teeth of each gear 27, which means that 2.4 ml assigned to the two gear 54 gear groove. Here, the output can be achieved without pulse, the displacement must, gear more, on a very small pulse. Can be negligible. Of course, the same with the rationality of the internal structure of the polyurethane pump. 
 Tightness, no leakage 
 Zenith, Pumps polyurethane pump seal lips, can do no leakage, air tightness. 
 Polyurethane metering pump series: Universal 
 Polyurethane metering pump material: universal type 400 stainless steel manufacturing 
 Polyurethane metering pump flow: Displacement (cc / rev): 0.05 | 0.3 | 0.6 | 1.2 | 2.4 | 4.5 | 9.0 | 15 | 30 | 45 | 90 
 Polyurethane metering pump speed range: 0.05 to 30 ml / transfer up to 500 rpm; 45 and 90 ml / transfer up to 300 rpm 
 The polyurethane Metering Pump viscosity range: 1CPS ~ 500,000 cps. 
 Polyurethane metering pump flow range: up to 27,000 ml / rev. 
 Polyurethane metering pump inlet pressure: 20 kg (300PSI) Highest 
 Polyurethane metering pump outlet pressure: 70 kg (1000PSI) Highest 
 Polyurethane metering pump pressure drop: 20 to 1000PSI (depending on viscosity) 
 Polyurethane metering pump temperature: minus 18 degrees minimum, 205 degrees (magnetic couplings seal), 340 (depending on the shaft seal material) 
 Polyurethane metering pump seal: mechanical seals, lip seals, packing seals, magnetic couplings seal