US 4,941,502 A · Low pressure recirculation valve

Abstract

A low pressure recirculation valve for cooling a centrifugal pump. The invention comprises a unitary valve casing divided into a first valve chamber and a second valve chamber, the casing having a first port for introducing fluids into said first chamber, and a second port for expelling fluids out of said second chamber, the first chamber having a recirculation port for redirecting fluids back to said centrifugal pump. A multiple piece check valve member situated between said first chamber and second chambers permits the flow of fluid from said first chamber to the second chamber and prevents the flow of fluid from said second chamber to said first chamber. A slidable valve stem coupled to said check valve member and extending through the first chamber moves the check valve member from an open to closed position. Means coupled to said valve stem biases the slidable valve stem and check valve means toward the closed position. A recirculation valve means operatively coupled to said valve stem opens and closes said recirculation port, said recirculation valve means opening when said check valve means is closed and closing when said check valve means is open.

Claims11

Dependent claims

A low pressure recirculating valve for cooling a centrifugal pump comprising;

a unitary valve casing having a first chamber for connection to a centrifugal pumping means and a second chamber for connection to a fluid outlet, said first chamber having a recirculation port for redirecting fluid from said first chamber to said centrifugal pump;
multiple piece check valve means situated between said first and second chambers for permitting fluid flow from said first chamber to said second chamber, said check valve means comprising a flat disk and a second disk transversely superimposed over said first disk whereby said disks can fit and be assembled within said unitary casing;
said check valve means opening when the fluid pressure in said first chamber exceeds the fluid pressure in said second chamber and closing when the fluid pressure in the second chamber approaches that in that said first chamber;
and
recirculation valve means coupled to said valve means for controlling the flow of fluid from said first chamber through said recirculation port, said recirculation valve impeding such flow when said check valve means is open and permitting such flow when said check valve means is closed.

2 more elements

A low pressure recirculation valve for cooling a centrifugal pump comprising;

a unitary valve casing divided into a first valve chamber and a second valve chamber, said casing having a first port for introducing fluids into said first chamber, a second port for expelling fluids out of said second chamber, said first chamber having a recirculation port for redirecting fluids back to said centrifugal pump;
a multiple-piece check valve member situated between said first chamber and second chambers for permitting the flow of fluid from said first chamber to said second chamber and preventing the flow of fluid from said second chamber to said first chamber, said check valve means comprising a flat disk and a second disk transversely superimposed over said first disk whereby said disks can fit and be assembled within said unitary casing;
a slidable valve stem coupled to said check valve member and extending through said first chamber, said valve stem moving said check valve from an open to closed position;
means coupled to said valve stem for biasing said slidable valve stem and check valve member toward the closed position;
and
reciprocating valve means operatively coupled to said valve stem for opening and closing said recirculation port;
said recirculation valve means being open when said check valve member is closed and closed when said check valve member is open.

4 more elements

Dependencies are inferred from the claim text.

Low pressure recirculation valve

Life of this patent

Low pressure recirculation valve

Life of this patent

Abstract

Claims11