A supplementary device or service, in this case referring to a valve that helps regulate a system.

An additional component that aids in the functioning of a primary system.

एक अतिरिक्त घटक जो प्राथमिक प्रणाली के संचालन में मदद करता है।

English Usage: The auxiliary valve improved the overall efficiency of the heating system.

Hindi Usage: सहायक वॉल्व ने हीटिंग प्रणाली की सामान्य दक्षता को सुधार दिया।