Fluid operated gate valve for use with vacuum equipment
US4157169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1977 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Oct 12, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/188
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gate valve for use with vacuum equipment is provided in which a gate assembly is opened and closed by a fluid operated device, such as a pneumatic cylinder. The gate assembly is enclosed in a valve housing. The valve housing has aligned openings therein, and the gate assembly is moved reciprocally between the walls and parallel to the planes of the aligned openings therein, to an open position and to a closed position with respect to the openings. The gate assembly comprises two gates which are intercoupled by a bellows, the bellows defining a hermetically sealed pressure vessel with the gates. The gate assembly is coupled to a piston in the pneumatic cylinder by a piston rod. The gate assembly is moved to its closed position when pressurized fluid is introduced to one end of the pneumatic cylinder; and the gate assembly is moved to its open position when pressurized fluid is introduced to the other end of the cylinder. When the gate assembly is moved to its closed position, a valve opens within the pneumatic cylinder, and pressurized fluid from the pneumatic cylinder is caused to enter the pressure vessel between the gates. This pressurized fluid forces the gates against seats m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.