Patent ID: 8313313
Filing Date: 2012-11-20
Classification: F04B

Abstract:
1. A pumping device ( 1 ) by means of which fluids ( 10 ) or pourable materials stored in a reservoir tank ( 9 ) can be transported to a spray gun ( 11 ) in a metered fashion, the device comprising: a piston rod ( pressure lines ( a working medium ( a diaphragm ( and a pumping chamber ( the second housing section and said diaphragm ( 12 , 13 ) form a control chamber ( 31 ) in which a negative pressure prevails, and wherein a negative pressure condition of the control chamber ( 31 ) can be monitored from the outside, wherein a control line ( 32 ) debouches in the control chamber ( 31 ), wherein a line is connected to a measuring device ( 33 ) and communicates therewith such that the measuring device ( 33 ) allows the negative pressure condition in the control chamber ( 31 ) to be measured, and the control chamber ( 31 ) is temporarily or permanently connected with a suction device ( 37 ) by means of the control line ( 32 ), and the suction device ( 37 ) allows the control chamber ( 31 ) to be evacuated, and said flexible ring area ( 16 ) of said diaphragm ( 12 , 13 ) is drawn into the control chamber ( 31 ) due to the negative pressure prevailing in the control chamber ( 31 ) and has a curvature ( 38 ) projecting in the direction of the control chamber ( 31 ).