8481.80.90.45 - With thermostatic actuators

This HTS classification, 8481.80.90.45, specifically designates taps, cocks, valves, and similar appliances that are equipped with thermostatic actuators. These devices are designed to regulate flow or pressure based on temperature changes. Examples include thermostatic mixing valves used in plumbing or heating systems, and automatic temperature control valves for industrial processes. The core function of these valves relies on the expansion or contraction of a temperature-sensitive element to operate the valve mechanism.

This category is distinguished from its siblings by the specific type of actuator employed. While other categories within 8481.80.90 cover valves with electrical, electro-hydraulic, or pneumatic actuators, this particular code is exclusively for those utilizing thermostatic actuation. The absence of electrical, hydraulic, or pneumatic components in the primary control mechanism is the defining characteristic.

As this is a leaf node, there are no further subcategories. Therefore, classification within 8481.80.90.45 depends on the presence of a thermostatic actuator as the primary means of valve operation and temperature regulation. Excluded from this category are valves where thermostatic control is achieved through external electronic or hydraulic systems, which would fall under different subheadings.