Elastomeric molded valve stem and spring hat
US6322051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 3, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K15/063
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve comprises a valve body including a valve cavity with an inlet and an outlet. The valve body has a valve seat in the valve cavity. The valve seat has a flow passage disposed between the inlet and the outlet. A valve stem is movable in the valve cavity between an open position and a closed position. The valve stem includes a substantially rigid shaft and a resilient shell. The resilient shell is generally tubular, and is injection molded around a portion of the shaft. The resilient shell includes a sealing surface which is spaced from the valve seat with the valve stem in the open position and which is pressed against the valve seat to block the flow passage between the inlet and the outlet with the valve stem in the closed position. The resilient shell includes a spring cavity. A resilient spring hat has a spring seat. The resilient spring hat is disposed in the valve cavity with a press fit against an inner surface of the valve cavity to seal the valve cavity against leakage. A spring is connected between the spring cavity of the resilient shell and the spring seat of the resilient spring hat. The spring biases the valve stem toward the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.