Pumps – Processes
Reexamination Certificate
2007-05-29
2007-05-29
Freay, Charles G. (Department: 3746)
Pumps
Processes
C417S534000, C417S901000, C062S050600
Reexamination Certificate
active
10764139
ABSTRACT:
A double-acting, reciprocating piston, high discharge pressure, cryogenic fluid pump having a unique blow-by venting system. In two different embodiments, a double-acting piston has two pair of piston heads and two sets of seals. In a first embodiment, a blow-by vent system is provided by a passageway that communicate with the cylinder between the pair of piston heads and vents the vapor or fluids axially through the piston rod. A second embodiment has the two piston heads separated on the piston rod a distance equal approximately to the stroke of the piston. This provides an annulus around the piston rod forming a manifold in communication with passageways through the pump cylinder wall to vent blow-by vapors or fluids. In both cases, blow-by vapors or fluids that leak or creep past the piston heads are vented to the liquid being pumped inside an insulating enclosure surrounding the pumps.
REFERENCES:
patent: 3181473 (1965-05-01), Duron
patent: 3456595 (1969-07-01), Gottzmann
patent: 4376377 (1983-03-01), Duron et al.
patent: 4559786 (1985-12-01), Schuck
patent: 4639197 (1987-01-01), Tornare et al.
patent: 5411374 (1995-05-01), Gram
patent: 5477690 (1995-12-01), Gram
patent: 2002/0085921 (2002-07-01), Gram et al.
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