Diaphragm pump
US4365745A · kind A · utility
Inventor
Key dates
| Filing date | Feb 5, 1981 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | Feb 5, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/073
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A hydraulically actuated pump of the piston-diaphragm type for pumping a liquid such as paint through an airless spray gun having a flexible hose which is connected to the pump outlet downstream of the outlet check valve and which has a volumetric capacity many times the displacement of the diaphragm actuating piston to constitute an elastically expansible and contractible pressure storage vessel. The driving fluid chamber of the pump between the piston and diaphragm has a restricted adjustable pressure control valve to control the operating pressure of the pump and an automatic hydraulic inlet-outlet valve operative upon arrest of the return movement of the diaphragm, to admit driving fluid from a reservoir into the driving fluid chamber during the continued terminal portion of return stroke of the piston and to permit expulsion of driving fluid from the driving fluid chamber to the reservoir during the initial portion of the pressure stroke of the piston to adjust the volume of hydraulic fluid between the piston and diaphragm thus to maintain a predetermined rate of discharge of the pumped liquid through the spray gun during the pressure and return strokes of the diaphragm and pi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.