Pneumatic valve actuators
US4783046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Apr 24, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/1262
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
There is disclosed a pneumatic gate valve actuator adapted to move the gate of the valve between opened and closed position by the introduction of air pressure into or the exhaustion of air pressure from an expandable and contractible pressure chamber formed within a tire casing and between upper and lower plates having their peripheries connected to inner edges of a tire casing. The lower plate is connected to the stem for the gate, the upper plate is connected to the bonnet of the actuator, and a coil spring is compressed between the lower plate and the bonnet, so that the gate may be moved to open position upon the supply of air pressure to the chamber, and moved to closed position upon the exhaust of air pressure from the pressure chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.