Low leakage solenoid valve
US4666125A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1986 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Feb 14, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/0655
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A normally closed high pressure solenoid valve structure including a plunger pin spring-urged against a composite valve seat having a steel reinforcing ring positioned against the seat and backed up by a fixed spacer. The seat has a projecting neck with orifice. The steel reinforcing ring surrounds and contains any radial movement of the seat which is of elastic material softer than the plunger pin which provides a very low leakage level across the valve from either direction. A lost-motion connection between the plunger pin and the solenoid armature provides that the spring load on the plunger pin is retained even with cold flow of the seating material during cycling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.