Importance

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Abstract

A constant flow valve comprises a valve body (5) having an inlet passage (2), an outlet passage (3), and a hollow chamber (4) disposed between the passages and inclined with respect to the inlet passage at a certain angle; an opening (7) for connecting the outlet passage with the hollow chamber, an inner circumferential face of the opening being tapered from an upstream side toward a downstream side; a lid body (17) fitted to the valve body; a spindle (9) supported by the lid body and movable back and forth along the axis of the opening; a cylinder (10) integrally arranged at a lower end of the spindle; a valve shaft (12) freely arranged inside the cylinder and positioned substantially on the axis of the opening; a valve plug (13) fitted to a front end of the valve shaft to create an orifice between itself and the opening; and springs (14, 15) disposed inside the cylinder to force the valve plug away from the opening. The cylinder (10) is movable back and forth inside the hollow chamber (4), and a lower end face thereof may come into contact with a valve seat portion (6) of the opening (7). The springs (14, 15) have different spring constants and expand or contract in response to changes in a fluid pressure. The springs are arranged such that their expanding or contracting actions actually start at different timings.

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First Claim