Flow-control valve
AssigneeConcordia Fluidtechnik GmbH
InventorKurt Stahle
Life of this patent
Estimating the term…
Abstract
A flow-control valve is provided, especially for controlling the flow of water heated to near its boiling point. In order to limit cavitation at the position immediately downstream of the throttling point formed by the sealing body, preferably in the form of a rubber diaphragm, and the valve seat, a ventilating slit is provided for communicating ambient air into the flow of liquid at a position downstream of the throttling point. In particularly preferred embodiments, the ventilating slit is formed between a thin inner tube and an outer tube, which outer tube has an upper end forming the valve seat. In particularly preferred embodiments, the cross section for the flow at the position where the ventilating air is introduced, is smaller than the throttling point cross section.
Claims19
Flow control valve for liquids, such as water or the like heated to near the boiling point;
- comprising:
- a sealing body,
- a valve seat which cooperates with the sealing body to form a throttling point,
- and ventilating aperture means opening into the flow of liquid through said valve at a position downstream of the throttling point, said ventilating aperture means being disposed adjacent the throttling point and being configured to prevent cavitation at the throttling point,
- wherein the valve seat is formed on a nozzle which is configured to have an increasing flow cross-sectional area downstream of the throttling point, and wherein the ventilating aperture means open into said nozzle at locations outside of the projection of the throttle point cross-section such that said liquid does not impinge directly on the ventilating aperture means.
Flow-control valve for liquids, such as water or the like heated or near the boiling point;
- comprising:
- a sealing body,
- a valve seat which cooperates with the sealing body to form a throttling point, and
- ventilating aperture means opening into the flow of liquid through said valve at a position downstream of the throttling point, said ventilating aperture means being disposed adjacent the throttling point and being configured to prevent cavitation at the throttling point,
- wherein the ventilating aperture means are in the form of an annular slit adjacent the throttle point,
- wherein the ambient pressure acts on the annular slit via an annular chamber, and
- wherein the annular slit and the annular chamber are located between a nozzle supporting the valve seat and an inner tube inserted into said nozzle.
Dependencies are inferred from the claim text.