Flow control device
First Claim
1. A flow control device for controlling fluid flowing in a fluid passage, comprising:
- a valve body disposed within said fluid passage, said valve body having a shutoff portion for prohibiting flow of fluid and a first and a second opening for allowing flow of the fluid, said second opening being smaller than said first opening, said valve body being movable between a first position in which said fluid passage is fully closed by said shutoff portion, a second position in which said fluid passage is opened by said first opening and a third position in which said fluid passage is opened by said second opening;
valve body operating means for moving said valve body between said first, second and third positions; and
control means for electrically performing a first duty control for said valve body operating means, said first duty cycle comprising repeated movement of said valve body between said first position and said third position, said valve body remaining in said first position for a first specified time period and said valve body remaining in said third position for a second specified time period.
1 Assignment
0 Petitions
Accused Products
Abstract
First to third openings are formed stepwise in a rotor side wall portion of a flow control valve disposed in a hot water circuit. Third positions (a) and (b) are established between a first position in which a first communication passage for communication between inlet and outlet pipes of the flow control valve is fully closed and a second position in which the first communication passage is fully opened. A duty control is performed so that the rotor reciprocates repeatedly among the above four positions. In this way, in the flow control valve for controlling the amount of the fluid flowing in the fluid passage, the valve colliding noise, the water hammer noise, and the temperature variation in the heating heat exchanger can be reduced.
23 Citations
18 Claims
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1. A flow control device for controlling fluid flowing in a fluid passage, comprising:
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a valve body disposed within said fluid passage, said valve body having a shutoff portion for prohibiting flow of fluid and a first and a second opening for allowing flow of the fluid, said second opening being smaller than said first opening, said valve body being movable between a first position in which said fluid passage is fully closed by said shutoff portion, a second position in which said fluid passage is opened by said first opening and a third position in which said fluid passage is opened by said second opening; valve body operating means for moving said valve body between said first, second and third positions; and control means for electrically performing a first duty control for said valve body operating means, said first duty cycle comprising repeated movement of said valve body between said first position and said third position, said valve body remaining in said first position for a first specified time period and said valve body remaining in said third position for a second specified time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A flow control device for controlling fluid flowing in a fluid passage, comprising:
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a valve body disposed within said fluid passage, said valve body having a shutoff portion for prohibiting flow of fluid and a first and a second opening for allowing flow of the fluid, said second opening being smaller than said first opening, said valve body being movable between a first position in which said fluid passage is fully closed by said shutoff portion, a second position in which said fluid passage is opened by said first opening and third position in which said fluid passage is opened by said second opening; valve body operating means for moving said valve body between said first, second and third positions; and control means for electrically performing a first duty control for said valve body operating means, said first duty cycle comprising repeated movement of said valve between said second position and said third position, said valve body remaining in said second position for a first specified time period and said valve body remaining in said third position for a second specified time period. - View Dependent Claims (15, 16, 17, 18)
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Specification