# US 6,003,167 A · Apparatus for eliminating gas from a fluid piping system

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- Number: US 6,003,167 A
- Document ID: US6003167A
- Status: Granted
- Kind: A
- Application number: 09/096,564
- Filed: 1998-06-12
- Granted: 1999-12-21
- Earliest claimed: 1998-06-12
- Inventors: W. Wayne Nehring
- Web page: https://patentgrep.com/patent/US6003167A

## CPC

- A61H 33/60: {Components specifically designed for the therapeutic baths of groups A61H33/00 (plumbing E03C1/00)}
- A61H 33/0087: {Therapeutic baths with agitated or circulated water}
- A61H 33/601: {Inlet to the bath}
- A61H 33/6068: {Outlet from the bath}
- A61H 2033/0025: {by connecting the air lines with the drain}
- Y10T 137/3015: Choke or restricted passage gas bleed
- A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A gas release apparatus for use with centrifugal pumps, and particularly for centrifugal pumps when used in conjunction with a fluid piping system such as hydrotherapy tubs, spas, and whirlpools.

## Claims

### Claim 1

Hydrotherapy apparatus comprising:
a tub configured to be filled with water and including a drain connection;
a jet positioned below the surface of the water when the tub is filled and operable to aspirate air into water flowing through the jet;
a centrifugal pump including an outlet positioned above the jet and an inlet;
a first conduit connecting the inlet of the pump to a water source;
a second conduit connecting the outlet of the pump to the jet;
a third conduit extending from the jet to above the surface of the water to enable air to be aspirated through the jet by water flowing from the pump through the jets; and
a fourth conduit connected at a first end to a high point of the second conduit and adapted to bleed air and water from the second conduit continuously when the centrifugal pump is in operation.

### Claim 2 (depends on 1)

Apparatus as defined in claim 1 wherein the fourth conduit is connected at a second end to the third conduit.

### Claim 3 (depends on 1)

Apparatus as defined in claim 1 wherein the fourth conduit defines one or more passageways restricted for the flow of air in preference to water.

### Claim 4 (depends on 1)

The apparatus of claim 1 wherein the fourth conduit includes a fluid restriction device located inside of a T-coupling having a disk with an orifice that is from about 0.1 mm. to about 10 mm. in diameter.

### Claim 5 (depends on 4)

The apparatus of claim 4 wherein the orifice is from about 2 mm. to about 4 mm. in diameter.

### Claim 6 (depends on 1)

The apparatus of claim 1 further comprising a valve operatively connected to the fourth conduit.

### Claim 7 (depends on 6)

The apparatus of claim 6 wherein the valve is operatively connected to the pump outlet.

### Claim 8

A system for reducing gas from liquid piping, the system comprising:
(a) a drain-and-fill reservoir for holding a quantity of liquid for hydrotherapy or bathing purposes having at least one reservoir outlet and at least one exit jet;
(b) a centrifugal pump with a pump inlet and a pump outlet at an elevation greater than the exit jet; and
(c) a liquid piping system connecting the reservoir and the pump, the piping system comprising
a suction line connecting the reservoir outlet and the pump inlet;
a discharge line connecting the pump outlet and the exit jet;
an air release apparatus connected to the discharge line between the pump outlet and the exit jet;
an air line having a first end connected to the air release apparatus, and a second end communicating with the atmosphere;
the air release apparatus comprises a T-coupling having a disk with an orifice that is from about 1 mm to about 6 mm in diameter mounted in the T-coupling so as to allow gas or liquid to pass through the orifice into the air line.

### Claim 9 (depends on 8)

The air release apparatus of claim 8 wherein the reservoir is in the group consisting of hydrotherapy tubs, spas, and saunas.

### Claim 10 (depends on 8)

The air release apparatus of claim 8 wherein the orifice is from about 2 mm. to 4 mm. in diameter.

### Claim 11 (depends on 10)

The air release apparatus of claim 10 wherein a valve is located in the air line.