Air breather null for hydraulic oil tank

摘要

PROBLEM TO BE SOLVED: To operate pressure regulating mechanism without removing an operating body by providing the operating body for operating the pressure regulating mechanism, and forming this operating body of a bendable elastic body in an air breather for an operating oil tank provided with the pressure regulating mechanism for regulating the pressure in an air chamber so as to be equal to that of outside air. ;SOLUTION: When the pressure in an air chamber of an operating oil tank rises to the specified pressure or higher, an exhaust poppet 9 rises, and air in the air chamber passes a clearance between the exhaust poppet 9 and a body 11, and a filter 6 so as to be exhausted through a clearance between a casing 4 and the body 11. In an air breather for the operating oil tank functioning in such a way, in the case of operating pressure regulating mechanism to regulate the pressure in the air chamber, an upper face part of a rubber cap 1 is pressed to move down the exhaust poppet 12. At this time, a clearance is formed between the exhaust poppet 9 and an intake poppet 12, and the outside of the casing 4 and the inside of the air chamber are communicated with each other through this clearance to regulate so that the pressure in the air chamber is equal to that of outside air.;COPYRIGHT: (C)1997,JPO