Instruction of pump type
For example：
1：250AYS80
250—Suction nozzle diameter (mm)
A:First reform
Y: Centrifugal oil pump
S:First stage impeller is double-suction
80: Head of single stage (m)
2：80AY100X2B
80:Suction nozzle diameter (mm)
A:First reform
Y: Centrifugal oil pump
100:Head of single stage (m)
2: Stage number
B:Impeller cutting code
Construction：
 The construction of oil pump type AY is divided into eight kind single-stage and single-suction overhung, double-stage and single-suction overhung, single-stage and double-suction overhung, single-stage and double-suction with two ends supporting, double-stage and double-suction with two ends supporting, single-stage and double-suction with two ends supporting，multi-stage and ring section.
The single and double stage pump casing is installed horizontally with supported on the center line. The suction and discharge nozzle flanges are cast together on the pump casing and vertical upwards. The stuffing boxes and pump cover are cast together which can be installed with soft packing seal and mechanical seals such as balancing bellow and series. The water-cooled chamber jacket, which can be selected ,is installed outside of shaft sealing chamber the water cooled chamber will be installed only when required by customers or when the medium is water with temperature more the 66℃ and hydrocarbon compound with temperature more than 120℃.
A journal ball bearing and thrust bearing arranged back-to-back are installed on the bearing housing. The bearings are lubricated by flinger with thin oil. Cooling fins are cast outside of bearing housing which can be cooled by air(temperature is less than 120℃). The bearing housing also can be cooled by water(temperature is 120℃ to 420℃)
The pumps are driven directly by driver through the membrane coupling. View from motor end, the rotating direction is anticlockwise.