A VALVE SEAT RING AND A MULTI-WAY VALVE HAVING VALVE SEAT RING

摘要

Disclosed are a valve seat ring (8) and a multi-way valve having the valve seat ring (8). The multi-way valve comprises an upper valve body (1), a lower valve body (2) and a rotary valve core (3), wherein the valve seat ring (8) is located in the rotary valve core (3), the valve seat ring (8) comprises a body (10), the body (10) is provided with a penetrated through-hole (18), a first annular boss (13) is arranged on an outer wall (11) of the body (10), and a second annular boss (14) is arranged on an inner wall (12); the upper surfaces of the first annular boss (13) and the second annular boss (14) are respectively flush with the upper surface of the body (10) to form a sealing surface (15) which fits with a sealing surface (9) of the upper valve body (1) in a sealed manner; and an annular gap is formed between the lower surface of the first annular boss (13) and the rotary valve core (3), so that liquid in a chamber (4) and an oil incoming channel (5) respectively acts on the lower surface of the first annular boss (13) or the second annular boss (14) to form a sealing load. Pressure is applied from either the chamber (4) or a metering orifice (6), a sealing load hydraulically acted on the valve seat ring (8) is formed by the hydraulic acting force of the chamber (4) or the metering orifice (6), and the hydraulic adaptability for sealing the valve seat ring (8) is realized, thereby meeting the requirement of sealing in the multi-way valve at the leakage level of sealing level VI under a high-pressure difference.