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1. The pump inlet and outlet pipes are cast on the lower pump body. The inlet and outlet of the pump body are flanged and connected in and out horizontally. The pump maintenance can not move the pump body or the inlet and outlet pipes, , The material of the pump body is ZG25, the lower part of the pump body is equipped with the guide key so that the pump body freely expands along the guide key, and the exhaust valve of the pump body is installed on the upper part of the pump body. 2. Rotor (1) The shaft of the pump is made of stainless steel forgings (2Cr13). The angle and chamfer R are strictly controlled. The concentricity is less than 0.025mm, and the surface of the bearing is chrome plated. (2) The hydraulic components adopt single stage, double suction impeller and stainless steel (ZGOCr13Ni4) Precision casting, and the pump housing wear ring seal with a single gap, the axial position by the ends of the hub of the nut to determine, so that the impeller can be positioned on the volute centerline, in order to prevent the axial back and forth, the impeller exit processed into oblique Mouth, so that the rotor is always subject to the transmission of the axial force. 3. Bearings (1) Sliding bearing using thin-walled ukin cylindrical sliding radial bearings, free-wheeling plus two-way tilting thrust bearing, the thrust pad to withstand axial force, forced oil circulation lubrication, thrust pad axial clearance 0.3 ~ 0.5 mm, therefore, no axial displacement. (2) The rolling bearing drive end adopts one single-row radial short cylindrical roller bearing; the free end adopts two single-row tapered roller bearings, mounted back-to-back, ensuring the axial clearance of 0.15 to 0.25mm during installation, Oil lubrication (3) Shaft end seal with balanced mechanical seal (8B1D), equipped with cooling water jacket in the pump housing to cool the hot water inside and outside the pump, thereby reducing the water temperature of the mechanical seal chamber, moving ring using graphite (SW- 1). The static ring is made of high-nickel cast iron. A cooling groove is formed on the back of the static ring, cooled with condensing water or industrial water. There is a Φ15 × 2.5 condensate water cooling on the moving and stationary ring ends to cool the moving and static toroidal surfaces , To extend the service life of mechanical seals.