Valve with fail-safe device
First Claim
1. A valve comprising:
- a housing;
a first flow control valve for controlling flow of a first fluid from a first source;
a second flow control valve for controlling flow of a second fluid from a second source;
a first actuator that is configured to move the first flow control valve;
a second actuator that is configured to move the second flow control valve;
a fail-safe device that holds each of the first and second actuators in a control position in response to electric power being supplied to the valve, wherein the fail-safe device releases the first and second actuators in response to an absence of electric power being supplied to the valve such that the first actuator and the first flow control valve move toward a closed position and such that the second actuator and the second flow control valve move toward a closed position;
a first spring that is disposed between the first actuator and the housing and is configured to apply a biasing force that biases the first actuator away from the housing; and
a second spring that is disposed between the second actuator and the housing and is configured to apply a biasing force that biases the second actuator away from the housing.
1 Assignment
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Accused Products
Abstract
A valve comprising a first flow control valve for controlling flow of a first fluid from a first source; a second flow control valve for controlling flow of a second fluid from a second source; a first actuator that controls movement of the first flow control valve; a second actuator that controls movement of the second flow control valve; and a fail-safe device that holds each of the first and second actuators in a control position in response to electric power being supplied to the valve, wherein the fail-safe device releases the first and second actuators in response to an absence of electric power being supplied to the valve such that the first actuator and the first flow control valve move toward a closed position and such that the second actuator and the second flow control valve move toward a closed position.
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Citations
23 Claims
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1. A valve comprising:
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a housing; a first flow control valve for controlling flow of a first fluid from a first source; a second flow control valve for controlling flow of a second fluid from a second source; a first actuator that is configured to move the first flow control valve; a second actuator that is configured to move the second flow control valve; a fail-safe device that holds each of the first and second actuators in a control position in response to electric power being supplied to the valve, wherein the fail-safe device releases the first and second actuators in response to an absence of electric power being supplied to the valve such that the first actuator and the first flow control valve move toward a closed position and such that the second actuator and the second flow control valve move toward a closed position; a first spring that is disposed between the first actuator and the housing and is configured to apply a biasing force that biases the first actuator away from the housing; and a second spring that is disposed between the second actuator and the housing and is configured to apply a biasing force that biases the second actuator away from the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A valve comprising:
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a housing; a first flow control valve for controlling flow of a first fluid from a first source; a second flow control valve for controlling flow of a second fluid from a second source; a first actuator that controls movement of the first flow control valve; a second actuator that controls movement of the second flow control valve; a fail-safe device that holds each of the first and second actuators in a control position in response to electric power being supplied to the valve, wherein the fail-safe device releases the first and second actuators in response to an absence of electric power being supplied to the valve such that the first actuator and the first flow control valve move toward a closed position and such that the second actuator and the second flow control valve move toward a closed position; a first armature coupled to the first actuator such that the entire first armature and the entire first actuator move together relative to the housing by a first distance between the control and closed positions; and a second armature coupled to the second actuator such that the entire second armature and the entire second actuator move together relative to the housing by a second distance between the control and closed positions. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A valve comprising:
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a first flow control valve for controlling flow of a first fluid from a first source; a second flow control valve for controlling flow of a second fluid from a second source; a first actuator that controls movement of the first flow control valve; a second actuator that controls movement of the second flow control valve; and a fail-safe device that holds each of the first and second actuators in a control position in response to electric power being supplied to the valve, wherein the fail-safe device releases the first and second actuators in response to an absence of electric power being supplied to the valve such that the first actuator and the first flow control valve move toward a closed position and such that the second actuator and the second flow control valve move toward a closed position wherein each of the first and second flow control valves comprises a spool and first and second valve members fixedly mounted on the spool at a predetermined distance apart; wherein a first end of the spool is slidably received within a blind guide bore formed in a valve body, and a second, opposed end of the spool is connected to the associated actuator; and wherein the second end of each spool is connected to a shaft of the associated actuator through a coupling unit that converts rotational movement of the shaft into linear movement of the spool. - View Dependent Claims (20, 21, 22, 23)
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Specification