Brittle material valves

A valve system, comprising:

• a valve comprising:
• a valve housing with a valve cavity extending in a length direction of the valve, the valve housing being formed entirely from a carbon-containing material that remains in a solid state in a temperature range of 1000° C. to 3000° C. and comprising a first port aligned with the valve cavity and a second port that is formed on a side of the valve cavity, wherein the valve housing comprises a first section and a second section that are separable and configured to couple in the length direction of the valve with at least a compressible sealing material in between;
• and
• a plunger being formed entirely from the carbon-containing material, movable in the valve cavity of the valve housing, and configured to control a fluid flow between the first port and the second port while the fluid flow is at a temperature of 1900° C.-2400° C.

A method of operating a valve system comprising a valve with a valve housing and a plunger, the method comprising:

• driving the plunger to move in a linear motion within a cavity of the valve housing to a position associated with a fluid flow between a first port and a second port of the valve housing, wherein:
• each of the valve housing and the plunger is formed entirely from a carbon-containing material that remains in a solid state in a temperature range of 1000° C. to 3000° C.,
• the first port is aligned with the cavity that extends in a length direction of the valve, and
• the second port is formed on a side of the cavity;
• and
• driving the plunger to move in a rotation motion when the plunger reaches the position associated with the fluid flow between the first port and the second port while the fluid flow is at a temperature of 1900° C.-2400° C.