Pump Assembly With Safety Valve
First Claim
1. A pump assembly, comprising:
- a fluid inlet (191) and a fluid outlet (197),a suction pump (198) having a pump inlet in fluid communication with the fluid inlet and a pump outlet in fluid communication with the fluid outlet,a first safety valve (150) arranged between the pump inlet and the fluid inlet,wherein the first safety valve is operatable between an initial state in which the safety valve is closed, and an activated state in which the safety valve is open, the first safety valve being operated from the initial to the activated state by means of suction action from the pump.
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Accused Products
Abstract
The invention provides a pump assembly comprising a suction pump and a safety valve arranged between the pump inlet and a fluid inlet for the assembly. The safety valve comprises an inlet valve and a moveable control member acting on the safety inlet valve, wherein the control member is operatable between an initial position in which the safety inlet valve is closed, and an activated position in which the safety inlet valve is open, and wherein the control member is moved from the initial to the activated position by means of suction action from the pump. By this arrangement the opening of the safety valve is positively controlled by the suction provided by the pump whereas the safety valve is closed during non-operation of the pump.
80 Citations
14 Claims
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1. A pump assembly, comprising:
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a fluid inlet (191) and a fluid outlet (197), a suction pump (198) having a pump inlet in fluid communication with the fluid inlet and a pump outlet in fluid communication with the fluid outlet, a first safety valve (150) arranged between the pump inlet and the fluid inlet, wherein the first safety valve is operatable between an initial state in which the safety valve is closed, and an activated state in which the safety valve is open, the first safety valve being operated from the initial to the activated state by means of suction action from the pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pump assembly, comprising:
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a fluid inlet (291) and a fluid outlet (292), a suction pump (298) comprising a variable-volume pump chamber and having an inlet valve (293) in fluid communication with the fluid inlet and an outlet valve (294) in fluid communication with the fluid outlet, the inlet valve and the outlet valve having a combined opening resistance, a first safety valve (250) arranged between the inlet valve and the fluid inlet, the first safety valve having an opening resistance less than the combined opening resistance of the inlet valve and the outlet valve. - View Dependent Claims (13, 14)
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Specification