# US 5,348,223 A · Method and apparatus for controlling temperature of a liquid

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,348,223 A
- Document ID: US5348223A
- Status: Granted
- Kind: A
- Application number: 07/867,092
- Filed: 1992-06-29
- Granted: 1994-09-20
- Earliest claimed: 1990-10-29
- Assignees: Arjo Hospital Equipment AB
- Inventors: Leif Sonesson; Jorgen Olsson
- Web page: https://patentgrep.com/patent/US5348223A

## CPC

- G05D 23/1393: {characterised by the use of electric means}
- Y10T 137/87249: Multiple inlet with multiple outlet
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method and an apparatus for producing a continuous liquid flow at a controlled temperature. The apparatus includes mixers (1, 2) which, upstream, are connected to a supply conduit (3) for hot liquid under pressure and a supply conduit (4) for cold liquid under pressure. Each respective mixer has an outlet (5, 6) connected to a common discharge conduit (9) by a first outlet conduit (7, 8). The common conduit (9) is provided with a tap (10) disposed downstream of the interconnection of the outlet conduits with the common conduit (9). The temperature of the liquid which is to be discharged through conduit (9) is adjusted in that hot and cold liquid are mixed in the mixers from which the liquid is supplied to the common conduit (9).

## Claims

### Claim 1

Apparatus for supplying liquid at a controller temperature comprising first and second mixers, a supply conduit for hot liquid under pressure connected to each of said mixers, a supply conduit for cold liquid under pressure connected to each of said mixers, central operating means connected to said mixers for controlling said mixers to supply mixed liquid at determined temperatures at respective outlets of said mixers, first and second outlet conduits respectively connected to the outlets of said first and second mixers, a common conduit connected to said first and second outlet conduits to supply mixed liquid from both said mixers as a combined liquid outflow externally of the apparatus through said common conduit as a first discharge conduit, temperature sensing means in said common conduit connected to said central operating means for control of the mixers, and a tap in said common conduit.

### Claim 2 (depends on 1)

Apparatus as claimed in claim 1 comprising a valve in said second outlet conduit.

### Claim 3 (depends on 1)

Apparatus as claimed in claim 1 wherein said first mixer has a second outlet, the apparatus further comprising a second discharge conduit connected to said second outlet of said first mixer, and second temperature sensing means in said second discharge conduit connected to said central operating means.

### Claim 4 (depends on 3)

Apparatus as claimed in claim 3 wherein said first mixer has smaller flow capacity than said second mixer.

### Claim 5 (depends on 1)

The apparatus as claimed in claim 1, wherein one of said mixers includes a second outlet for mixed liquid, said apparatus further comprising a second discharge conduit for outflow of liquid from the apparatus separate from the first said discharge conduit and second tap in said second discharge conduit.

### Claim 6 (depends on 5)

The apparatus as claimed in claim 5, comprising a connection between said second discharge conduit and said first outlet conduits to supply mixed liquid from said mixers to both first and second discharge conduits.

### Claim 7 (depends on 6)

The apparatus as claimed in claim 6, comprising a non-return valve in said first outlet conduit of one of the mixers to prevent liquid flow in said first outlet conduit to said one mixer from the other said mixer.

### Claim 8 (depends on 7)

The apparatus as claimed in claim 7, comprising further non-return valves between each mixer and the respective supply conduits for hot and cold liquid to prevent backflow of liquid from said mixers.

### Claim 9 (depends on 1)

The apparatus as claimed in claim 1, wherein each mixer comprises a thermostat mixer.