The air starting valve is operated by pressurised air from the air bottle. Each air admittance valve is equipped with its own distributor and Ahead-Astern cam.
These cams have been adjusted for their opening times in such a manner, so as to ensure overlapping for consecutive cylinders for a certain time period, based on the firing order of the engine
Each cylinder is equipped with a starting valve fitted at the lateral side of the cylinder cover. The housing for the valve is integrally cast with the lower part of the two piece cylinder cover.
The valve chest is made out of a steel casing. The miter faced valve is carried at one end of the spindle, and the other end is provided with the guide piston.
The control piston is screwed with the extension of the valve spindle. The valve guide piston is fitted in a bush and is equipped with a number of seal rings.
A store spring keeps the valve firmly seated. A control piston with its cylinder is secured with the valve body by two studs, thus the body makes a gas tight joint with the cylinder cover.