초록 ▼

A butterfly valve includes a duct defining a fluid flow path and a plate-like valve member pivotal in the duct to in one position open and close the latter. The valve member is pivotal to a second position spanning the duct and extending parallel to the flow path to allow fluid flow therein. Means a

A butterfly valve includes a duct defining a fluid flow path and a plate-like valve member pivotal in the duct to in one position open and close the latter. The valve member is pivotal to a second position spanning the duct and extending parallel to the flow path to allow fluid flow therein. Means are provided for altering the effective area distribution of the valve member about its pivot axis to effect opening and closing of the inventive valve in response to fluid pressure forces acting thereon.

대표청구항 ▼

The method of stopping and throttlingly controlling a flow of pressurized fluid, said method comprising the steps of: conveying said fluid flow through a duct; disposing a plate-like butterfly valve member in said duct for free pivotal movement about a transverse axis substantially bisecting said du

The method of stopping and throttlingly controlling a flow of pressurized fluid, said method comprising the steps of: conveying said fluid flow through a duct; disposing a plate-like butterfly valve member in said duct for free pivotal movement about a transverse axis substantially bisecting said duct between a first position transverse to and closing said duct and a second position non-transverse or substantially parallel with said duct to open said fluid flow therein; providing an aperture through said butterfly valve member in one of a pair of wings thereof which are on opposite sides of said pivot axis and substantially of equal area; opening and closing said aperture with a pilot valve member carried upon said butterfly valve member: using an actuator including a motor to move said pilot valve to open and close said aperture, and carrying said actuator and motor upon said butterfly valve member.