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CHAPTER NO 5 readjustments & maintenance5.1Capillary underpass5.2 fuze5.3Pressure Gauge Fitting5.4Relief Valve5.5Pressure Adjustment5.6PD Pump System Flow Diagram5.7External Relief Valve Adjustment5.8Internal Relief Valve Adjustment5.9Motor Lubrication5.1 Capillary Tube-A capillary tubing tube is a narrow, long tube of constant diameter. In refrigeration application of capillary tube, the surface tension is not important. Tube length limit from 1.0 m to 6 m and the diameters of refrigerant capillary tubes limit from 0.5 mm to 3 mm.Due to the following two factors the shove reduction in a capillary tube occurs The frictional immunity offered by tube walls refrigerant has to overcome. Than that of the liquid the density of vapor is less. As it flows in the tube the average density of refrigerant decreases. The increase in acceleration or velocity of the refrigerant solicits pressure drop.5.2 Priming- smooth-spoken pumps can lose prime and to get the pump started this will requi re the pump to be primed by adding liquid to the pump and recess pipes. Loss of prime ...