A hollow poppet valve (10) is provided with an additional flange shape cavity (S1a), in addition to an ordinary valve head cavity (S1) formed in the valve head (14) of the valve (10) in communication with a valve stem cavity (S2) formed in a valve stem (12). A coolant (19) is loaded in the cavities to facilitate dissipation of heat out of the valve. This flange shape cavity (S1a) extends radially outwardly round a bottom portion of the valve head cavity (S1), extending close to a valve seat, thereby significantly facilitating heat transfer between the coolant (19) and the valve seat of the valve, yet, since the flange shape cavity (S1a) does not influences the thickness of other regions of the valve, it does not degrade durability of the valve.

A hollow poppet valve (10) is provided with an additional flange shape cavity (S1a), in addition to an ordinary valve head cavity (S1) formed in the valve head (14) of the valve (10) in communication with a valve stem cavity (S2) formed in a valve stem (12). A coolant (19) is loaded in the cavities to facilitate dissipation of heat out of the valve. This flange shape cavity (S1a) extends radially outwardly round a bottom portion of the valve head cavity (S1), extending close to a valve seat, thereby significantly facilitating heat transfer between the coolant (19) and the valve seat of the valve, yet, since the flange shape cavity (S1a) does not influences the thickness of other regions of the valve, it does not degrade durability of the valve.

A valve for a pressurizable enclosure includes a valve head provided at a first portion of the valve, a connecting portion extending between the first portion and a second portion of the valve, a chamber comprising a hollow portion, and a first body disposed within the chamber. The valve head is configured to selectively permit fluid flow into or out of the pressurizable enclosure. The hollow portion of the chamber is provided at least partially within the connecting portion and configured to contain a filler material. The first body is configured to be movable within the chamber during valve operation.

A valve for a pressurizable enclosure includes a valve head provided at a first portion of the valve, a connecting portion extending between the first portion and a second portion of the valve, a chamber comprising a hollow portion, and a first body disposed within the chamber. The valve head is configured to selectively permit fluid flow into or out of the pressurizable enclosure. The hollow portion of the chamber is provided at least partially within the connecting portion and configured to contain a filler material. The first body is configured to be movable within the chamber during valve operation.