With the discovery of large oil and gas offshore fields in the mid 1900 s, this industry expanded widely and offshore drilling became very lucrative. This fast economic growth, in addition to the increased challenges of field operations, caused the first great environmental accidents due to sea oil spill. That increased the demand for tests that would guarantee a higher level of trust and safety on such projects. Nowadays, all oil and gas drilling and production equipment must be submitted to strict quality control tests under international standards, such as ISO and API (American Petroleum Institute). This Undergraduate Final Project presents the development of a thermal chamber for temperature testing for subsea actuated gate valves quality control, in accordance to API 6A Annex F standard. Initially there will be an introduction of subsea actuated gate valves projects, in accordance to API 6A standard, and its quality control tests. The temperature test was studied in detail in order to map all the test chambers requirements so the project could be detailed. The chamber, in addition to addressing the API 6A test requirements, must have a structure that allows a quick setup and that respects the project s lead time. Therefore, a prototype was built and tested to validate the chamber project concept and, after these results were analyzed, the project was revised, fabricated, assembled and tested in accordance with the API 6A regulation. The analysis of the results from the last test concluded that the goals for the project were achieved.