packing ring

A polymer packing ring and a guide ring is attached with the Acetal guide bush.

The thickness of the NFTC packing ring is equal to 50% of the difference between the dia of a new wheel and the wheel in question.

In order to ensure that the packing ring and the guide ring retain their respective place, a dashpot spring is fixed which applies continuous pressure on the piston ring.

The piston and slide valve rods were all fitted with metallic packing to the stuffing boxes, and all pistons fitted with packing rings and springs.

This packing ring is generally made up of NFTC(Natural Fiber Thermosetting COMPOSITE) or UHMWPE (Ultra-high molecular weight polyethylene) material.

In case the buffer height is still not obtained even after placement of the packing ring, then compensation rings are to be inserted below the axle box spring ensuring that the bogie frame height is within 686 + - 5 mm.