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US 5,397,219 AGranted
Integral liquid pump and drainback valve
AssigneeC. Cretors & Company
InventorCharles D. Cretors
Life of this patent
Estimating the term…
Abstract
An integral liquid pump and drainback valve for use in pumping popcorn popping oil. A two-part housing is formed with one part having cavities forming inlet and outlet passages extending from an impeller cavity. A second part is formed with inlet and outlet ports and shuttle valve cavity connecting those ports. The inlet and outlet passages and the inlet and outlet ports respectively are in fluid communication with each other when the two parts are secured to each other. A resilient biasing means in the shuttle valve cavity moves the shuttle to a position wherein a fluid path is provided between the inlet and outlet ports when the pump impeller is not driven.
Claims22
An integral liquid pump and drainback valve comprising,
- a housing,
- a pump impeller means,
- a pump impeller cavity formed in said housing for receiving said pump impeller means, an inlet passage formed in said housing in fluid flow communications with said pump impeller cavity, and outlet passage formed in said housing in fluid flow communications with said pump impeller cavity,
- an inlet port formed in said housing,
- an outlet port formed in said housing,
- a shuttle valve cavity formed in said housing, said shuttle valve cavity in fluid flow communications with both said inlet passage and said outlet passage, and with both said inlet port and said outlet port,
- a shuttle received within said shuttle valve cavity,
- a resilient biasing means received within said shuttle valve cavity, said resilient biasing means urging said shuttle toward said outlet port so as to essentially block fluid flow through said shuttle valve cavity between said outlet port and said outlet passage,
- means for driving said impeller means, said impeller means when driven drawing fluid from said inlet port through said shuttle valve cavity and said inlet passage and discharging it through said outlet passage to said shuttle valve cavity, the discharge of fluid through said outlet passage causing said shuttle to be moved against said biasing means to permit the discharge of fluid through said shuttle valve cavity to said outlet port, said shuttle being moved by said biasing means when said impeller means is no longer driven to essentially block fluid flow through said shuttle valve cavity between said outlet passage and said outlet port, and to provide fluid flow communications through said shuttle valve cavity between said outlet port and said inlet port to permit fluid to be returned through said outlet port and said shuttle valve cavity to said inlet port so as to equalize the fluid pressures at said inlet and outlet ports.
6 more elements
An integral liquid pump and drainback valve comprising,
- a housing,
- a pump impeller means,
- a pump impeller cavity formed in said housing for receiving said pump impeller means, an inlet passage formed in said housing in fluid flow communications with said pump impeller cavity, and outlet passage formed in said housing in fluid flow communications with said pump impeller cavity,
- an inlet port formed in said housing,
- an outlet port formed in said housing,
- a shuttle valve cavity formed in said housing, said shuttle valve cavity in fluid flow communications with both said inlet passage and said outlet passage, and with both said inlet port and said outlet port,
- a shuttle received within said shuttle valve cavity, said housing being positioned for use such that the gravitational force on said shuttle urges said shuttle toward said outlet port so as to essentially block fluid flow through said shuttle valve cavity between said outlet port and said outlet passage,
- means for driving said impeller means, said impeller means when driven drawing fluid from said inlet port through said shuttle valve cavity and said inlet passage and discharging it through said outlet passage to said shuttle valve cavity, the discharge of fluid through said outlet passage causing said shuttle to be moved against the gravitational force to permit the discharge of fluid through said shuttle valve cavity to said outlet port, said shuttle being moved by the gravitational force when said impeller means is no longer driven to essentially block fluid flow through said shuttle valve cavity between said outlet passage and said outlet port, and to provide fluid flow communications through said shuttle valve cavity between said outlet port and said inlet port to permit fluid to be returned through said outlet port and said shuttle valve cavity to said inlet port so as to equalize the fluid pressures at said inlet and outlet ports.
5 more elements
An integral liquid pump and drainback valve comprising,
- a housing,
- a pump impeller means,
- a pump impeller cavity formed in said housing for receiving said pump impeller means, an inlet passage formed in said housing in fluid flow communications with said pump impeller cavity, and outlet passage formed in said housing in fluid flow communications with said pump impeller cavity,
- an inlet port formed in said housing,
- an outlet port formed in said housing,
- a shuttle valve cavity formed in said housing, said shuttle valve cavity in fluid flow communications with both said inlet passage and said outlet passage, and with both said inlet port and said outlet port,
- means for driving said impeller means,
- a shuttle received within said shuttle valve cavity, said shuttle blocking fluid flow through said shuttle valve cavity between said outlet passage and said outlet port when said pump impeller means is not driven, said impeller means when driven drawing fluid from said input port through said shuttle valve cavity and said inlet passage and discharging it through said outlet passage to said shuttle valve cavity, the discharge of fluid through said outlet passage to said shuttle valve cavity causing said shuttle to be moved to permit the discharge of fluid through said shuttle valve cavity to said outlet port, said shuttle again blocking fluid flow communication through said shuttle valve cavity between said outlet passage and said outlet port when said impeller means is no longer driven, and fluid flow communications being provided through said shuttle valve cavity between said outlet port and said inlet port to permit fluid to be returned through said outlet port and said shuttle valve cavity to said inlet port so as to equalize the fluid pressures at said inlet and outlet ports.
5 more elements
Dependencies are inferred from the claim text.