Device for circulating sealing gas for mechanical dry seals...

Details Device for circulating sealing gas for mechanical dry seals... Device for circulating sealing gas for mechanical dry seals...

2005-08-23

2005-08-23

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

Piston

Nonmetallic portion

C417S418000

Reexamination Certificate

active

06931983

ABSTRACT:
A device (10) for circulating sealing gas for mechanical dry seals (11) of a centrifugal compressor (13) at times when the machine is stationary and pressurized; the device comprises a sealed reciprocating compressor (12), which includes a piston (14) slidable in a cylinder (16), and the piston (14) is moved by a magnetic coupling to an external magnetic element (20) which moves along the said cylinder (16).

REFERENCES:
patent: 4231722 (1980-11-01), Teichmann
patent: 6789804 (2004-09-01), Wilhelm
patent: 6802689 (2004-10-01), Nogiwa

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