Three-way bleed type proportional electromagnetic valve
First Claim
1. A three-way bleed type proportional electromagnetic valve comprising:
- a solenoid coil;
a core that is excited by energizing the solenoid coil;
a plunger on which magnetic attractive force is exerted from the core when the core is excited;
a bleed valve element that is in contact with or separated from a first seat portion of a valve seat depending on the magnetic attractive force acting on the plunger;
a housing that houses the valve seat and the bleed valve element and has an input port, an output port, and an ejection port for control by means of the bleed valve element a subject fluid supplied via the input port such that fluid having a predetermined output pressure is discharged at the output port; and
a stop valve element that is disposed in a cylindrical shape in a flow passage between the input port and the output port so as to be in sliding contact with a wall of the flow passage and that is in contact with or separated from a second seat portion of the valve seat,wherein in controlling an output pressure to a minimum value the stop valve element is brought in contact with the valve seat so as to close the input port and to cause the output port and the ejection port to communicate with each other.
1 Assignment
0 Petitions
Accused Products
Abstract
A bleed-type proportional electromagnetic valve having an input port, output port, and ejection port is disclosed. Fluid force and pressing force, proportionate to an output pressure and a current flowing in a solenoid coil respectively, act on a bleed valve for controlling the output pressure, whereby the valve can obtain an output pressure commensurate to the flowing current by displacing the valve to a position that those forces counterbalance, wherein the valve is provided with a stop valve disposed so as to be in sliding contact with a passage between the input and output port, and in contact with or separated from a valve seat. This enable the stop valve to contact with the valve seat so as to close the input port and communicate the output port with the ejection port when controlling the output pressure to be minimum.
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Citations
20 Claims
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1. A three-way bleed type proportional electromagnetic valve comprising:
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a solenoid coil; a core that is excited by energizing the solenoid coil; a plunger on which magnetic attractive force is exerted from the core when the core is excited; a bleed valve element that is in contact with or separated from a first seat portion of a valve seat depending on the magnetic attractive force acting on the plunger; a housing that houses the valve seat and the bleed valve element and has an input port, an output port, and an ejection port for control by means of the bleed valve element a subject fluid supplied via the input port such that fluid having a predetermined output pressure is discharged at the output port; and a stop valve element that is disposed in a cylindrical shape in a flow passage between the input port and the output port so as to be in sliding contact with a wall of the flow passage and that is in contact with or separated from a second seat portion of the valve seat, wherein in controlling an output pressure to a minimum value the stop valve element is brought in contact with the valve seat so as to close the input port and to cause the output port and the ejection port to communicate with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A three-way bleed type proportional electromagnetic valve comprising:
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a solenoid coil; a core that is excited by energizing the solenoid coil; a plunger on which magnetic attractive force is exerted from the core when the core is excited; a bleed valve element that is in contact with or separated from a valve seat depending on the magnetic attractive force acting on the plunger; a housing that houses the valve seat and the bleed valve element and has an input port, an output port, and an ejection port for control of a subject fluid; a stop valve element that is disposed in a flow passage between the input port and the output port so as to be in sliding contact with a wall of the flow passage and that is in contact with or separated from the valve seat, wherein in controlling an output pressure to a minimum value the stop valve element is brought in contact with the valve seat so as to close the input port and to cause the output port and the ejection port to communicate with each other; and wherein the stop valve element is formed, at an input-port-side end, with an elliptical groove whose width is smaller than an outer diameter of the projection of the bleed valve element.
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19. A three-way bleed type proportional electromagnetic valve comprising:
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a solenoid coil; a core that is excited by energizing the solenoid coil; a plunger on which magnetic attractive force is exerted from the core when the core is excited; a bleed valve element that is in contact with or separated from a valve seat depending on the magnetic attractive force acting on the plunger; a housing that houses the valve seat and the bleed valve element and has an input port, an output port, and an ejection port for control of a subject fluid; a stop valve element that is disposed in a flow passage between the input port and the output port so as to be in sliding contact with a wall of the flow passage and that is in contact with or separated from the valve seat, wherein in controlling an output pressure to a minimum value the stop valve element is brought in contact with the valve seat so as to close the input port and to cause the output port and the ejection port to communicate with each other; wherein the stop valve element is formed with a stop valve element communication hole that enables the output port to communicate with the input port and the ejection port; and wherein the stop valve element has a large-diameter portion that is in sliding contact with the housing and a small-diameter portion that is inserted in a valve seat communication hole and has an end that is in contact with the bleed valve element. - View Dependent Claims (20)
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Specification