Air relay
US4465090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1982 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | May 7, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86413
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An oscillating or timing valve, sometimes known as an air relay, suitable for use with a chemical injector. A valve housing with sliding poppet, sliding piston and adjustable needle, with the poppet movable in one direction to close an exhaust port and with the piston movable in the opposite direction to engage the poppet and close the outlet or drive port and open the exhaust port. The piston oscillates between the drive port open and the drive port closed conditions, with the timing adjusted by varying the needle orifice and the size of the chamber fed through the needle orifice. The oscillating valve does not utilize any diaphragms or springs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.