# US 5,344,071 A · Expansion tank airation device

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- Number: US 5,344,071 A
- Document ID: US5344071A
- Status: Granted
- Kind: A
- Application number: 07/981,555
- Filed: 1992-11-25
- Granted: 1994-09-06
- Earliest claimed: 1992-11-25
- Inventors: Frederick Peifer
- Web page: https://patentgrep.com/patent/US5344071A

## CPC

- F24D 3/1008: {expansion tanks}
- Y10T 137/3115: Gas pressure storage over or displacement of liquid
- F24D: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for purging water from flooded expansion tanks without necessitating the complete drainage and subsequent refilling of the systems allows for a stabilized hydronic water system in much less time with less effort and expense.

## Claims

### Claim 1

A method for the purging of water from a flooded expansion tank in a hydronic heating system comprising:
a) calculating the volume of water equivalent to one-half the volume of the expansion tank;
b) pumping air into the drain valve of the expansion tank;
c) opening the drain valve of the associated boiler unit;
d) draining an amount of water forced out by the air in an amount approximately equivalent to one-half the volume of said expansion tank and;
e) closing the valves.

### Claim 2 (depends on 1)

The method of claim 1 wherein said air pump is connected directly to the drain valve of said expansion tank using a flusher connector component comprising an air valve threadably attached to a dual female adapter by means of a bushing.

### Claim 3 (depends on 2)

The method of claim 2 wherein said water is forced from the expansion tank into the associated boiler unit.

### Claim 4 (depends on 3)

The method of claim 3 wherein said boiler drain valve is closed prior to the cessation of pumping air in order to equilibrate the system.

### Claim 5 (depends on 4)

The method of claim 4 further comprising a hose connected to the flusher component at one end and the expansion tank drain at the other.

### Claim 6 (depends on 2)

The method of claim 2 wherein said air valve is a Schrader air valve.

### Claim 7

A means for purging water from a flooded expansion tank consisting of an air source and a flusher component comprising an air valve, a bushing, and a dual female connector for attaching the air source to the drain valve of an expansion tank in an hydronic heating system.

### Claim 8

A means for purging water from a flooded expansion tank consisting of an air source and a flusher component comprising a Schrader air valve, a bushing, a dual female connector and a flexible hose for attaching the air source to the drain valve of an expansion tank in an hydronic heating system.