4-PORT VALVE

摘要

A 4-port valve for quickly controlling the direction of flow of fluids of two systems, especially, two types of fluids having different temperatures between flow paths without leakage of fluids through a simple construction. In this 4-port valve, a casing (1) is divided into four chambers (3a, 3b, 3c, 3d) by a substantially X-shaped partition wall (2). Two confronting chambers (3d, 3c) of the four chambers are made fixed chambers communicating with ports, respectively, connected to flow paths of two systems wherein the flow direction of fluid is fixed, while the remaining two confronting chambers (3a, 3b) are made switch-over chambers communicating with ports, respectively, connected to flow paths of two systems wherein the flow direction of fluid is switched. Valve ports (5ac, 5ad, 5bd, 5bc) are formed in the substantially X-shaped partition wall (2) for establishing communications between the two adjacent chambers. A valve plate (6) for closing the valve port and a driving shaft (8) for supporting and oscillating the same are provided on one of the four chambers (3a, 3b, 3c, 3d) for example, on the chamber (3d), while a valve plate (6') for closing the valve port is provided on the confronting chamber (3c), and the valve plate (6') is connected to the valve plate (6) supported on the driving shaft (8) via a semi-circular or circular connecting ring (7) which passes through the valve ports (5ac, 5ad, 5bd, 5bc), whereby the two fixed chambers (3d, 3c) are made to communicate with the different switch-over chambers (3a, 3b) alternately by interlocking the valve plate (6) with the other valve plate (6') both of which are oscillated by virtue of the rotation of the driving shaft (8), thereby only fluid of one system being allowed to flow around the driving shaft (8).