Valving for multi-stage vacuum pumps

Details Valving for multi-stage vacuum pumps Valving for multi-stage vacuum pumps

2008-01-15

2008-01-15

Koczo, Jr., Michael (Department: 3746)

Pumps

Successive stages

Reciprocating rigid stages

C417S517000, C417S539000

Reexamination Certificate

active

10920674

ABSTRACT:
A multi-stage vacuum pump comprises a first piston in a first cylinder defining a first stage pumping chamber and a second piston in a second cylinder defining a second stage pumping chamber. The pump has a spool valve between the first and second cylinders for controlling flow from the first stage pumping chamber to the second stage pumping chamber. Either the first cylinder and the first piston or the second cylinder and the second piston being stepped so as to define a third stage pumping chamber. The spool valve is arranged to control the flow from the second stage pumping chamber to the third stage pumping chamber.

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European Search Report of Application No. 04 25 5438; Date of completion of search: Aug. 9, 2005.
UK Patent Office Search Report for Application No. GB 0321576.1; Date of search: Jan. 23, 2004.

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