# US 2013/0153056 A1 · Composite valve

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- Number: US 2013/0153056 A1
- Document ID: US20130153056A1
- Status: Published application
- Kind: A1
- Application number: 13/711,777
- Filed: 2012-12-12
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Fujikoki Corporation
- Inventors: Yusuke ARAI
- Web page: https://patentgrep.com/patent/US20130153056A1

## CPC

- F25B 41/35: by rotary motors, e.g. by stepping motors
- F16K 31/12: actuated by fluid ({fluid-actuated lift valves F16K1/126} ; fluid-actuated check valves F16K15/00; fluid-actuated safety valves F16K17/00)
- F25B 41/34: with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F16K 31/04: using a motor
- F16K 31/406: {acting on a piston}
- F25B 2341/067: Expansion valves having a pilot valve
- Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
- Y10T 137/7758: Pilot or servo controlled
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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)}
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composite valve has a communication path, a second valve port and a pilot passage. First and second valve bodies are arranged to be moved up and down in the same direction, and are away from each other only at a predetermined distance. In the case that a lift amount of the second valve body for a small flow rate control is equal to or less than a predetermined amount, said pilot passage and a first valve port are respectively closed by a pilot valve body and the first valve body, thereby taking a small flow rate control state. In the case that the lift amount of said second valve body goes beyond said predetermined amount, said pilot valve body is moved up by the upward movement of a valve shaft to open said pilot passage, thereby taking a large flow rate control state.

## Claims

### Claim 1

A composite valve comprising:
a first valve body;
a valve shaft which is provided with a second valve body;
an elevation driving means for moving up and down said valve shaft;
a pilot valve body which is driven so as to be opened and closed by utilizing an elevating motion of said valve shaft; and
a valve main body which is provided with an inflow port and an outflow port,
wherein between said inflow port and said outflow port in said valve main body, there are provided a fitting and inserting chamber to which said first valve body is slidably fitted and inserted, and which is zoned into a back pressure chamber and a first valve chamber by said first valve body, a first valve port which is open to said first valve chamber, a second valve chamber in which said pilot valve body and said second valve body are arranged so as to be movable up and down, a communication path which communicates said inflow port or said first valve chamber with said second valve chamber, a second valve port which communicates said second valve chamber with said outflow port, and a pilot passage which communicates said back pressure chamber with said outflow port,
wherein said first valve body and said valve body are arranged in such a manner as to be moved up and down in the same direction, and are away from each other only at a predetermined distance, and
wherein in the case that a lift amount of said second valve body is equal to or less than a predetermined amount, said pilot passage is closed by said pilot valve body, and said first valve port is closed by said first valve body, thereby taking a small flow rate control state in which a flow rate is controlled in correspondence to said lift amount of said second valve body, and in the case that said lift amount of said second valve body goes beyond said predetermined amount, said pilot valve body is moved up in conjunction with the upward movement of said valve shaft so as to open said pilot passage, thereby taking a large flow rate control state in which said first valve body opens said first valve port.

### Claim 2 (depends on 1)

A composite valve as claimed in claim 1, wherein said pilot valve is energized downward by a spring member so as to close said pilot passage, and is pulled up against the energizing force of said spring member by a catch portion which is provided in said valve shaft, if the lift amount of said second valve body is increased further more than said predetermined amount.

### Claim 3 (depends on 1)

A composite valve as claimed in claim 1, wherein said first valve body is provided with a pressure equalizing hole which communicates said first valve chamber with said back pressure chamber.

### Claim 4 (depends on 2)

A composite valve as claimed in claim 2, wherein said first valve body is provided with said pressure equalizing hole which communicates said first valve chamber with said back pressure chamber.