Are possible supply stable regardless of changes in the surrounding environment, and can open and close the valve without using an active element, the forward flow obtaining a smooth fluid supply device.
Fluid supply source (2), a valve (3A), and differential pressure generating means (4), and pressurizing means (6), the fluid supply apparatus comprising a. Valve (3A) includes a housing (10), dividing the 該筺 body (10) inside the first valve chamber (11) and the second valve chamber (12), the pressure of the fluid acting on the front and back main surfaces the second opening provided with a displacement member which is displaced (20), a first opening provided in the first valve chamber (11) and (15), the first valve chamber (11) by ( 16), and a third opening provided in the second valve chamber (12) and (17), the. Thus, the changes in the surrounding environment, the pressure in the discharge side or the suction side of the apparatus even if fluctuation, change in flow rate is suppressed.