Kamdhenu Valves Private Limited

SUPER ALLOY VALVES: Recent developments in very high performance engines require very high performance valves where the conventional Valve Steels could not satisfy the required parameters. Hence newer material were invented like Nimonic 80 A, Pyromet 31, Inconel - X751, Nitronic - 20, etc. Most of these Super Alloys are Nickel based with various other alloying elements including Iron (Fe) present only in small percentages to enhance the performance.

BI-METAL VALVES: Usually used for making Exhaust Valves. Since the temperatures & working conditions is severe at exhaust port, austenitic steels like 21-4 / N or higher grade is the preferred material choice. There are two major disadvantages of using this in single metal construction.

A) Austenitic Steels are not easily hardenable. Hence the Valve Tip has to be either Stellited or a hardened piece has to be welded at the tip end. Both the operations are relatively expensive compared to induction hardening.

B) The severe working conditions are only near the Valve Seat area & the Valve Neck portion to some extent. The portion of Valve in valve Guide i.e. the Valve Stem, does not have to sustain these extreme conditions. Hence the use of costly austenitic steel is not justified. The solution was to make a Bi-metal Valve. The most reliable of making Bi-metal Valves is by Friction Welding Process. Hence Bi-metal Valves reduces the cost of Valve.

MONO - METAL VALVES: It is the least complicated of all valve constructions. Reduces manufacturing cost.

SHROUDED VALVES: The “shroud” or the projection just above the Valve Seat increases the swirling effect inside the Combustion chamber as the valve is usually rotating inside the chamber. This improves the efficiency. The valve shape is complicated & is difficult & costly to manufacture.