Bottom drain valve construction
US3949963A · kind A · utility
Inventor
Key dates
| Filing date | Nov 7, 1974 |
| Grant date | Apr 13, 1976 |
| Priority date | — |
| Expiry date | Nov 7, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bottom drain valve comprises a housing with an upper tubular portion with a top drain opening and an annular valve seat around the drain opening. The drain discharge connects laterally downwardly from the lower part of the upper tubular portion. A valve rod guide and sealing portion of the housing extends below and is aligned with the upper portion and has a valve rod guide bore therethrough. A lower cylindrical portion of the housing has a bottom wall with a piston passage bore and has a first drain chamber below the valve rod guide and sealing portion and a second piston chamber below the drain chamber. A piston guide chamber is defined between the first drain chamber and the second piston chamber. An actuating piston is movable in the second piston chamber and has a central hollow tubular portion which is guided in the piston guide chamber adjacent its upper end and guided through the piston bore adjacent its lower end and out of the lower cylindrical portion. The hollow tubular portion permits draining of the leakage liquid therethrough. A valve member including a rod portion extends through at least part of the hollow tubular portion of the piston and through the valve rod g…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.