Chinese wholesale Valve Guide - Cummins Engine part Piston Ring Set 4089489/3804500/3803358 for Cummins NT855 Engine – Raptors

Company Introduction

Raptors, the authorized dealer of Cummins (China), established in 2015 by Mr. Jordan Wang who worked in Cummins (China) for 8 years, Jordan had been responsible for mine market for 4 years during working in Cummins china, so we have big advantages for almost all genuine Cummins generators, engine assembly and spare parts, especially for NTA855, KTA19, KTA38, KTA50, QSK60, QSX15 etc…

Product Parameter

Working principle of piston rings

Piston rings are metal rings that are embedded in the grooves of the piston. There are two types of piston rings: compression rings and oil rings. The compression ring is used to seal the combustible mixture in the combustion chamber; the oil ring is used to scrape excess oil from the cylinder.

The piston ring is a metal elastic ring with large outward expansion deformation, which is assembled into the annular groove corresponding to the cross section. Reciprocating and rotating piston rings rely on the pressure difference of gas or liquid to form a seal between the outer circular surface of the ring and the cylinder and one side of the ring and the ring groove.

Features of Piston Rings

1.Force: The forces acting on the piston ring include gas pressure, the elastic force of the ring itself, the inertial force of the reciprocating motion of the ring, the friction between the ring and the cylinder and the ring groove, etc.

2.Thermal conductivity: The high heat generated by combustion is transmitted to the cylinder wall through the piston ring, so it can cool the piston.

3.Air tightness: The first function of the piston ring is to maintain the seal between the piston and the cylinder wall and to control air leakage to a minimum.

4.Oil control: The second function of the piston ring is to properly scrape off the lubricating oil attached to the cylinder wall and maintain normal oil consumption.

5.Support: Because the piston is slightly smaller than the inner diameter of the cylinder, if there is no piston ring, the piston will not be stable in the cylinder, and it will be impossible to move freely.

Product Application

Piston rings are widely used in various power machinery, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic machines, etc., and are widely used in automobiles, trains, ships, yachts, etc. Generally, the piston ring is installed in the ring groove of the piston, and it forms a chamber with the piston, cylinder liner, cylinder head and other components to do work.

Product Pictures