| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor-operated valve capable of controlling with high accuracy a flow rate when a small flow rate circulates, decreasing a pressure loss more when a large flow rate circulates, changing a flow direction promptly and stably, and improving reliability without causing valve body enlargement.SOLUTION: Check-valve valving elements 75 as three balls are each arranged to close check valve ports 72B and 72C during normal flow and open them during reverse flow. Guide columns 73A and 73B as guide means for enabling the check-valve valving elements 75 to open and close the check valve ports 72B and 72C surely and smoothly are provided protrusively downward from a ceiling 21a of a valve chamber 21 to a predetermined height position above a valve seat body 16. A circulation gap H is formed between the lower end surfaces of the guide columns 73A and 73B and an upper surface of the valve seat body 16. |
