Pumps – With signal – indicator – or inspection means
Patent
1991-03-20
1992-07-14
Bertsch, Richard A.
Pumps
With signal, indicator, or inspection means
92 865, F04B 2100, F01B 3100
Patent
active
051297906
ABSTRACT:
A plunger pump for supplying solution in accordance with an extrusion action of a plunger within a pump chamber. The plunger pump includes a cleaning chamber sealed by a seal member around and relative to the plunger, with a cleaning liquid inlet-side flow conduit and a cleaning liquid outlet-side flow conduit for communicating with the cleaning chamber, respectively. A mechanism isolates one of the inlet- and outlet-side flow conduits from the atmosphere and releases the other to an atmosphere under a condition where the cleaning liquid inlet- or outlet-side flow conduits are filled with the cleaning liquid. If the seal member in sliding contact with the plunger is degraded or aged, it is possible to observe a leakage of the liquid from the pump chamber along a sealing face between the seal member and the plunger.
REFERENCES:
patent: 2330781 (1943-09-01), Langmyhr et al.
patent: 3914752 (1975-10-01), Howard et al.
patent: 3943717 (1976-03-01), Schexnayder
Hirata Genzo
Kato Wataru
Ohnuma Sadabumi
Takiuchi Hiromi
Tomimatsu Sachio
Bertsch Richard A.
Hitachi , Ltd.
Richman Howard R.
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