# US 11,112,019 B2 · Integral check valve

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- Number: US 11,112,019 B2
- Document ID: US11112019B2
- Status: Granted
- Kind: B2
- Application number: 16/654,843
- Filed: 2019-10-16
- Published: 2020-04-23
- Granted: 2021-09-07
- Earliest claimed: 2018-10-17
- Assignees: McGuire Manufacturing Co., Inc.
- Applicants: McGuire Manufacturing Co., Inc.
- Inventors: Kevin Mayer; Robert B. Williams, Jr.
- Web page: https://patentgrep.com/patent/US11112019B2

## CPC

- F16K 15/063: {the valve being loaded by a spring}
- F16K 1/422: {attachable by a threaded connection to the housing}
- F16K 15/18: with actuating mechanism; Combined check valves and actuated valves
- F16K 15/1848: {Check valves combined with valves having a rotating tap or cock}
- F16K 27/0209: {Check valves or pivoted valves}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

An integral check valve has a stem with a first interior bore extending longitudinally inward from a first end thereof and a spindle having a central shaft having a first end and an opposing second end with flange circumscribing the central shaft. The interior bore is sized to receive the stem and a portion of the central shaft extending from the first end to the flange. The integral check valve may be a component of a plumbing fixture that further includes a hollow body having a water inlet, a water outlet and an integral check valve receiving conduit. The integral check valve receiving conduit has threads sized to engage the outwardly extending threads of the stem.

## Claims

### Claim 1

An integral check valve, comprising:
a stem having a first interior bore extending longitudinally inward from a first end thereof;
a spindle with a central shaft having a first end and an opposing second end with a flange circumscribing the central shaft adjacent the second end; and
a compressible spring circumscribing a portion of the central shaft between the first end and the flange;
wherein the interior bore is sized to receive the portion of the central shaft extending from the first end to the flange and the compressible spring.

### Claim 2 (depends on 1)

The integral check valve of claim 1 wherein threads extend outward from a surface adjacent the first end thereof.

### Claim 3 (depends on 2)

The integral check valve of claim 2 wherein a conformable set packing circumscribes the central shaft of the spindle between the flange and the second end.

### Claim 4 (depends on 3)

The integral check valve of claim 3 wherein a handle engages an opposing second end of the stem.

### Claim 5

A plumbing fixture, comprising:
an integral check valve with:
a stem having a first interior bore extending longitudinally inward from a first end thereof and threads extending outward from a surface adjacent the first end thereof,
a spindle with a central shaft having a first end and an opposing second end with a flange circumscribing the central shaft adjacent the second end, and
a compressible spring circumscribing a portion of the central shaft between the first end and the flange; and
a hollow body having a water inlet, a water outlet and an integral check valve receiving conduit, the integral check valve receiving conduit having threads sized to engage the outwardly extending threads of the stem.

### Claim 6 (depends on 5)

The plumbing fixture of claim 5 wherein a compressive force of the spring is effective to be displaced by incoming water pressure and not be displaced by backflow of water from the water outlet.

### Claim 7 (depends on 6)

The plumbing fixture of claim 6 wherein a handle engages an opposing second end of the stem.

### Claim 8 (depends on 7)

The plumbing fixture of claim 7 wherein the integral check valve is configured such that rotation of the handle causes rotation of the threads of the stem within the threads of the check valve receiving conduit.

### Claim 9 (depends on 8)

The plumbing fixture of claim 8 wherein a conformable set packing circumscribes the central shaft of the spindle between the flange and the second end.

### Claim 10

A plumbing fixture, comprising:
an integral check valve with:
a stem having a first interior bore extending longitudinally inward from a first end thereof and threads extending outward from a surface adjacent the first end thereof,
a spindle with a central shaft having a first end and an opposing second end with a flange circumscribing the central shaft adjacent the second end, and
a compressible spring circumscribing a portion of the central shaft between the first end and the flange; and
a hollow body having a water inlet, a water outlet, a secondary opening and an integral check valve receiving conduit, the integral check valve receiving conduit having threads sized to engage the outwardly extending threads of the stem.

### Claim 11 (depends on 10)

The plumbing fixture of claim 10 wherein a shut-off handle is configured to regulate a flow of water to the water inlet.

### Claim 12 (depends on 11)

The plumbing fixture of claim 11 wherein the shut-off handle is configured such that no water flows to the water inlet when the shut-off handle is in a closed position.

### Claim 13 (depends on 12)

The plumbing fixture of claim 12 wherein a compressible spring circumscribes the central shaft of the spindle between the first end and the flange, the spring being sized to fit within the interior bore.

### Claim 14 (depends on 13)

The plumbing fixture of claim 13 wherein a compressive force of the spring is effective to be displaced by incoming water pressure and not be displaced by backflow of water from the water outlet.

### Claim 15 (depends on 14)

The plumbing fixture of claim 14 wherein a handle engages an opposing second end of the stem.

### Claim 16 (depends on 15)

The plumbing fixture of claim 15 wherein the integral check valve is configured such that rotation of the handle causes rotation of the threads of the stem within the threads of the check valve receiving conduit.

### Claim 17 (depends on 16)

The plumbing fixture of claim 16 wherein a conformable set packing circumscribes the central shaft of the spindle between the flange and the second end.