Pumps – Including separate port on noncyclic valve for venting or...
Patent
1995-11-09
1997-08-26
Freay, Charles G.
Pumps
Including separate port on noncyclic valve for venting or...
137202, F04B 3900, F04B 5300
Patent
active
056605331
ABSTRACT:
A vacuum assisted pump priming system which includes a vacuum chamber communicating with a pump inlet via a transfer passage. A valve assembly within the vacuum chamber controls the communication of a vacuum source with the chamber. The valve assembly includes a semi-cylindrical valve body having a plurality of ports by which the vacuum source is communicated with the vacuum chamber. A closure element, attached to a float, is operative to block the vacuum ports when the float rises above a predetermined level in the vacuum chamber in response to liquid entering the chamber. A lost motion connection is established between the float and the valve body, which enables the float to rise above the predetermined level, while the closure element maintains its blocking relationship with the ports. The float includes an enlarge portion that acts as a defuser and a tamper portion which is received in the transfer passage and is operative to dislodge matter drawn into the transfer passage. The float may include extension portions which act as shields and occupy additional volume in the vacuum chamber in order to reduce the liquid level rise in the chamber. The valve body and closure element may be arranged at a predetermined angle to promote drainage and a shield overlies the transfer passage to inhibit the entry of solids into the vacuum chamber. A two-stage eductor assembly is used to provide cooling for a seal chamber forming part of the pump.
REFERENCES:
patent: 3296973 (1967-01-01), Paish et al.
patent: 3307492 (1967-03-01), Selwood et al.
patent: 3591316 (1971-07-01), Piccirilli
patent: 3726303 (1973-04-01), Allen et al.
patent: 3904319 (1975-09-01), Paish et al.
patent: 4381928 (1983-05-01), Roffelsen
patent: 5020567 (1991-06-01), Proulx
Article Authored by A. Tynan, Entitled "Pump Priming by Applied Vacuum", pp. 167-169, World Pumps, Date Unknown.
Article Authored by C.E.J. Sheather, Entitled "Design Improvements to a Solids Handling Auto Priming, Torgue Flow Pumps", pp. 143-147, Date Unknown.
Freay Charles G.
The Gorman-Rupp Company
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