Poppet valve and method of its manufacture

A method for manufacturing a poppet valve or mushroom valve, comprising:

• providing a mixture of metal powder and a binder,
• filling and pressing the mixture in a mold, to obtain two green products;
• wherein each of the discrete green products is in the form of a half shell valve having a hollow head portion and a hollow stem portion and a longitudinally extending joining surface;
• and wherein the two green half shell valves are joinable to one another along their respective longitudinal joining surfaces;
• removing the binder from the green products;
• matching the two half shell valves of the green product along their longitudinal joining surfaces either before or after removal of the binder and thereafter joining them to one another by thermally sintering the green products by subjecting the joined half shells hot isostatic pressing to obtain a hollow poppet valve blank.