Mechanical seal for chemical pump, hot water pipeline pump, oil pump is very important. The installation of mechanical seal can make the pump run without leakage, greatly improve the working environment of the pump management personnel, but also extend the service life of the pump.

The following is a detailed explanation of the installation steps of mechanical seal:

(1) Prepare the workbench (ground) and disassembly tools for placing the pump parts. Do not put them carelessly to avoid damaging the pump parts.

(2) Confirm that the motor is in maintenance state before disassembly; Unscrew the oil plug and suck out the lubricating oil in the sealing seat cavity with a straw.

(3) disassemble the split coupling: first unscrew the fixed hex screw of the coupling, and then gently pull down the half of the coupling from the shaft slowly (pay attention not to fall off). Unscrew the pump shaft retaining bolt and block with the box wrench, let the impeller slowly sink to the pump body, remove the other half of the coupling, and take down the pump shaft retaining ring.

(4) Remove the sealing seat: unscrew the compression nut of the sealing seat, gently remove the sealing seat (note: do not break the rubber oil seal on the seat) and clean.

(5) Disassemble and clean the bearing seat: first loosen the bearing seat gently, then use the removal bolt to lift the bearing seat, and lift it up along the pump shaft and unload; Clean bearing and seat with jet fuel, dry before loading and apply a little No. 20 mechanical oil lubrication protection.

(6) Remove the mechanical seal: grab the seal spring up along the pump shaft, you can remove.

(7) Mechanical seal assembly: in the moving and static ring mirror coated with a layer of clean 20 lubricating oil; Guide bearing seat with lubricating oil, the static ring gently positioned into the guide bearing seat; Then grease the pump shaft, gently load the moving ring part of the mechanical seal into the pump shaft, and gently push the seal ring should be able to retract freely (pay attention to the anti-rotation parts of the moving and static ring parts need to be assembled in place).

(8) Install the sealing seat: install the rubber oil seal on the sealing seat first, then load the sealing seat into the pump cover and press on the bearing seat, tighten the nut.

(9) Install the coupling: install the retaining ring on the motor shaft head first, install half of the coupling, and then install the blocking block in the pump shaft end and the coupling groove and tighten the bolt with a box wrench (lift the pump shaft 3~5 mm and provide the prestressed mechanical seal); Install the other half of the coupling and screw on the hex socket screw must be tightened. Correct inspection requirements for coupling installation: uniform clearance between the upper and lower parts of the split coupling; Hand drive coupling several turns to check the rotation is flexible.

(10) Test run according to the key points to check whether the replacement of mechanical seal is correct and whether the pump group is in normal operation.