Butterfly valve assembly
US4133513A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2265
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A butterfly valve assembly includes a two-section housing in which a resilient liner is seated. The liner includes diagonally opposed collars, with a bushing being bonded within each collar. A gate is rotatably mounted within the liner and includes closure, stem and stub shaft portions of integral, one-piece construction. The gate is formed of plastic and includes a metallic reinforcing shaft extending completely therethrough. The closure includes bearing surfaces extending around the stem and stub shaft, and sealing surfaces extending between the bearing surfaces. The sealing and bearing surfaces are of continuous uninterrupted spherical configuration. The liner includes seating surfaces which extend between annular surfaces of each collar. The seating surfaces and the annular collar surfaces are of continuous uninterrupted spherical configuration. Flat surface portions are disposed on the bearing surfaces and extend around the stem and stub shaft portions. Flat ends of the bushings bear against these flat surfaces in sealing relationship. The stem includes a tapered section which extends between a pair of constant diameter sections to facilitate insertion of the gate within the l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.