| 摘要 |
PURPOSE:To provide a simple valve structure capable of reducing pressure loss, by inserting a throttle valve actuating member connected with a throttle valve member into a hole formed in a fluid constituting member, and varying the sectional area of fluid passages smoothly from a normal passage to an outlet opening. CONSTITUTION:A fluid passage constituting member 13 in a valve cage 11 is moved vertically by turning a spindle 19, whereby the differential pressure acted to a throttle valve actuating member 28 inserted into a hole 27 formed concentrically with a variable shaft of the member 13 is changed and a throttle valve member 25 connected to the member 28 is actuated. Resultantly, the sectional area of a flow restricting passage (g) is changed. Further, since arrangement is such that the sectional area of fluid passages (d), (e), (f) is increased gradually from an inlet opening (a) and a normal passage (c) formed between the outer surface of a cylindrical section 21 of the member 13 and the inner wall surface of the valve cage 11 toward an outlet opening (i), so that different static pressures are acted to the surfaces of the member 28. Thus, it is enabled to reduce pressure loss. |
