CAP FOR TANK EQUIPPED WITH AUTOMATIC VALVE-CLOSING FUNCTION

摘要

PROBLEM TO BE SOLVED: To provide a cap which can perform a replenishment while keeping a specified liquid level without making a liquid from an external tank overflow. SOLUTION: This cap for tank equipped with an automatic closing valve function is equipped with a diaphragm 13 and a valve disc 17. The diaphragm 13 pneumatically operates by sealing the other end of an air tube 23 of which one end is always dipped in a liquid. The valve disc 17 closes a flow-in port 19 for the liquid from the external tank by the diaphragm 13. Then, the valve disc 17 is brought into contact with or separated from the flow-in port 19 by an air pressure by the liquid level in the air tube 23.