Unloading system for cryogenic pumps
US4376377A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1981 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Apr 3, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/243
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A multi-cylinder pump for a cryogenic liquid is provided with an unloading system in which the inlet valve of each cylinder can be selectively held open or permitted to close. In the closed position, the operation of the cylinder is normal; while, in the open position, the liquid fails to attain sufficient pressure to exit through the outlet valve, thereby deactivating the cylinder. Preferably, the unloading system comprises several plunger assemblies which may be extended in order to engage the inlet valve and hold it in the open position. Each plunger assembly may be activated by means of a manual thumb screw or in accordance with the change in a pressure differential acting on the plunger. Alternatively, the plunger assembly may be activated electronically by means of a solenoid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.