The AMOT Model 4140 is a high-capacity, self-actuating 3-way thermostatic control valve designed for precise and reliable temperature regulation in critical applications. It is commonly used for diverting or mixing fluids in engine jacket water systems, lubricating oil cooling circuits, and various industrial processes. Operating without any external power source, the 4140 valve utilizes a proven wax-based thermostatic element to automatically maintain the desired fluid temperature. Its robust ductile iron construction ensures long-lasting performance in demanding environments, making it a low-maintenance, “fit and forget” solution for protecting vital equipment and optimizing system efficiency.