Centrifugal pumps in the zero-flow conditions, the minimum shaft power for the rated shaft power of 30% - 90%, so the starting characteristics of the centrifugal pump is zero flow start (ie, off the valve start). After the pump reaches the rated speed, the control valve slowly opens at the set speed. Working principle: When the pump is started (before), the pressure water flows through the solenoid valve with delay to the upper chamber of the piston in the cylinder, while the lower chamber of the piston opens to the atmosphere through the solenoid valve at the lower end of the cylinder. At this time, the control valve is in the closed state. Motor compensation start over, the pump is running, the solenoid valve to perform commutation command, cut off the pressure on the piston cavity, close the lower end of the cylinder to the atmosphere loop, while the pressure water through the solenoid valve into the cylinder piston lower chamber, open the piston Upper chamber open to the atmosphere of the loop, the piston cavity of the water through the solenoid valve discharge valve, the control valve at a set speed slowly open to complete and meet the centrifugal pump at zero flow axis power minimum starting characteristics to ensure that the pump unit Safe operation.
UNI Flanges
UNI style of flanges:
Plate (UNI 2276 2277 2278 6083 6084) ,Blind (UNI6091 6092 6093 6094 6095 6096 6097) ,Threaded (UNI2253 2254), Welding-Neck (UNI2280 2281 2282 2283 2284 2285 2286)
Pressure rating:
PN 6 PN10 PN16 PN25 PN40 PN64 PN100
Features
Dimensions:
UNI AND DRAWING
Carbon Steel Materials:
ASTMA105-ASTMA350LF2/ASTMA694 F42-F52-F60-F65-70/C22.8/C21/Rst37.2/S235JRG2/P355NH/SS400
Alloy Steel Materials:
ASTM A182 F1-F11-F12-F22-F5-F9-F91
Stainless Steel Materials:
ASTM A 182 F304/304L/304H-ASTM A182 F321/321H-ASTM A182 F347-347H-ASTM A182 F316-316L-316H
Special alloys:
DUPLEX-SUPER DUPLEX-INCONEL-INCOLOY-MONEL-HASTELLOY-TITANIUM
UNI Flanges,UNI Blind Flanges,UNI EN Flanges,Flat Faced Flange
Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflanges.com