FACILITIES 

DUROVALVES specialises in and has capability to produce small batches with short lead times. The following are the manufacturing facilities that Durovalves has as its strong infrastructure.

MANUFACTURING FACILITIES - VALVES

DIE MAKING

Quality Forging dies with accurate Dimensions and Profile ensure consistent Quality Valves. Durovalves is equipped with NC machine to produce highly accurate dies for the manufacture of Valves to match International Standards.

ELECTRIC UPSETING &
FORGING

Operation made by FICEP Machine Starting from precut slugs, the process consists of Upsetting and Forging Operations. The upsetting process is PLC controlled and carried out at a temperature of 900⁰C and transferred onto the die for the Forging Operation. The Forging is carried out with a 160 & a 250 Ton Friction Screw Press with Controlled Forging loads to ensure consistency, thus maintaining dimensions according to the tolerances and specifications.

HEAT TREATMENT

Through Hardening & Solutionsing Aging of Steels are done in the state-of-the-art Fumaces, ensuring uniform Mechanical Properties.

FRICTION WELDING

Bimetal Valves – The head is of Austenitic Steel and Stem is of Martensitic Steel welded together. Austenitic is for heat resistance and the Martensitic Steel for wear resistance.

BUTTON WELDING

Weld Tip – Hardenable material such as Martensitic Steel button is welded to Austenitic Steel at the end whereby the end is hardened to increase wear resistance.

STELLITE DEPOSIT

Stellite Grade – 6 or 12 is welded on the Seat to Improve wear resistance and corrosion resistance. The Seat itself undergoes a Stellite Coating Process

SEAT GRINDING

Seat Grinding is done on the state-of-the-art machine to ensure consistent concentricity and cylindricity to match International Standards.

INDUCTION HARDENING –
 SEAT & TIP

Valves are hardened at the end to required length and area to increase the Hardness as per Customer’s requirements by special Induction Hardening Process.

GROOVING

Cottor Grooves are made as per Customer Requirements on a special turning machine within close tolerances and accuracy.

TUFFTRIDING 

Valves are Tuffrided to increase Surface Hardness of the Steam and resistance to corrosion. The layer which undergoes such treatment also acts as a Surface Protection, limiting the danger of Seizure even in the absence of Lubrication

CHROMIUM PLATING

Valve Stem coated with Chrome Flash having 3-7 microns thickness or Chrome Plated having thickness of 15-25 microns to increase the Surface Hardness of Stem with consequent sliding ease.