Low noise rotary control valve
US4212321A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Apr 9, 1979 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Apr 9, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86751
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The valve comprises a casing which defines a receptacle having a main axis. The receptacle has a pair of opposed ports forming a flowway having an axis disposed at an acute angle to the main axis. A flow-control element is rotatably disposed within the receptacle. The element has an axis of rotation coaxial with the main axis. The body of the control element defines an axial open bore. The bore is in register with the flow ports at the fully-open position of the control element. A pair of elongated orifice slots extend circumferentially through the wall of the control element's body. At least one slot is defined by wall converging toward its trailing end. A chamber surrounds the walls of the axial bore in the control element's body. Silencing means in the body of the control element produce a silencing effect on the fluid flowing through the flowway only when the flowway is throttled by the orifice slots. The flow in the flowway is substantially unhindered when the ends of the bore are opposite to the flow ports in the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.