Valve construction
US4057217A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1975 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Aug 4, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/22
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve includes a housing, a pivotal stem mounted on housing, and a disk mounted on the stem and tiltable within the housing to control the flow rate of a fluid. Means for attaching the stem to the disk includes a keyway defined by one of the stem and the disk, and an associated pin carried by the other of the stem and the disk. The keyway includes a ramp inclined with respect to the stem at a particular angle, and portions of the pin slide on the ramp in response to temperature change of the fluid to accommodate radial and axial displacement of the disk with respect to the stem. The particular angle of the ramp can be made dependent upon the diameter of the stem and the distance between a fixed point along the stem and the ramp pin. With this particular angle, the pin will slide on the ramp radially and axially of the stem while maintaining a fixed angular relationship between the stem and the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.