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The temperature limits for various valve materials depend on the type of material and its ability to withstand extreme temperatures. Below, I'll provide a general guideline for some common valve materials and their temperature ranges. Keep in mind that specific temperature limits can vary based on the manufacturer and the quality of the material. It's important to consult the valve manufacturer's documentation for precise temperature recommendations for a particular valve.

Carbon Steel:

Carbon steel valves can typically handle temperatures from -29°C (-20°F) to 538°C (1000°F) or higher, depending on the specific grade and design.

Stainless Steel:

Stainless steel valves are known for their resistance to corrosion and can operate in a wide temperature range, typically from -196°C (-321°F) to 816°C (1500°F).

Brass:

Brass valves are suitable for temperatures ranging from -40°C (-40°F) to 149°C (300°F), but they may not be suitable for extremely high-temperature applications.

Bronze:

Bronze valves have a similar temperature range to brass, typically from -40°C (-40°F) to 204°C (400°F).

Cast Iron:

Cast iron valves, such as those used in low-pressure applications, can handle temperatures ranging from -34°C (-30°F) to 538°C (1000°F).

PVC (Polyvinyl Chloride):

PVC valves are limited to relatively low-temperature applications and are typically used in the range of -20°C (-4°F) to 60°C (140°F).

CPVC (Chlorinated Polyvinyl Chloride):

CPVC valves can handle a slightly higher temperature range than PVC, usually from -20°C (-4°F) to 93°C (200°F).

PTFE (Polytetrafluoroethylene, Teflon):

PTFE is known for its excellent chemical resistance but has a temperature range of approximately -29°C (-20°F) to 204°C (400°F).

Alloy Valves (e.g., Inconel, Hastelloy, Monel):

Alloy valves are designed for high-temperature and corrosive applications and can operate in a wide range of temperatures, often from cryogenic temperatures to over 1000°C (1832°F), depending on the specific alloy.

Ceramic:

Ceramic valves are known for their resistance to wear and corrosion but can operate at temperatures typically ranging from -18°C (0°F) to 871°C (1600°F) or higher.

These are general temperature guidelines for commonly used valve materials. However, the specific temperature limits can vary based on factors like the composition of the material, the valve design, and the intended application. Always refer to the manufacturer's specifications and guidelines for the most accurate information regarding the temperature range of a particular valve.