Pilot check valve
First Claim
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1. A pilot check valve comprising:
- a flow passage body including a first port and a second port;
a movable body which is at least partly disposed slidably in the flow passage body and configured to move in an axial direction thereof under action of a pilot pressure;
a packing mounted on the movable body and configured to be displaced between a valve closed position and a valve open position integrally with the movable body, the packing including an inclined lip which is elastically deformable radially, the lip being configured to make sliding contact with an inner circumferential surface of the flow passage body;
a detector configured to detect whether or not the movable body is placed at a position that causes the packing to be positioned at the valve closed position; and
a packing support member configured to be fixed to the movable body so as to be displaced integrally with the movable body in the axial direction, to surround the packing, and to prevent the lip from being deformed radially outwardly by a predetermined amount or more,wherein, in the valve closed position, the packing allows a working fluid to flow from the first port toward the second port, and blocks flow of the working fluid from the second port toward the first port, and in the valve open position, the packing allows the first port and the second port to communicate with each other,and wherein, when the packing is at the valve closed position, the lip is able to be pressed and elastically deformed in a radially inward direction by the working fluid supplied from the second port, and separated away from the inner circumferential surface of the flow passage body, whereby the lip allows the working fluid to flow from the first port toward the second port.
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Abstract
A pilot check valve includes: a fluid channel body; a moveable body that moves in an axial direction under effects of pilot pressure; a packing including a lip portion that is displaceable, integrally with the moveable body, between a valve close position and a valve open position; and a detector to detect position of the moveable body. The packing, in the valve close position, allows flow of an operating liquid from a first port side of the fluid channel body to a second port side and prevents the flow of the operating liquid from the second port side to the first port side, and in the valve open position, connects the first port and the second port.
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Citations
5 Claims
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1. A pilot check valve comprising:
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a flow passage body including a first port and a second port; a movable body which is at least partly disposed slidably in the flow passage body and configured to move in an axial direction thereof under action of a pilot pressure; a packing mounted on the movable body and configured to be displaced between a valve closed position and a valve open position integrally with the movable body, the packing including an inclined lip which is elastically deformable radially, the lip being configured to make sliding contact with an inner circumferential surface of the flow passage body; a detector configured to detect whether or not the movable body is placed at a position that causes the packing to be positioned at the valve closed position; and a packing support member configured to be fixed to the movable body so as to be displaced integrally with the movable body in the axial direction, to surround the packing, and to prevent the lip from being deformed radially outwardly by a predetermined amount or more, wherein, in the valve closed position, the packing allows a working fluid to flow from the first port toward the second port, and blocks flow of the working fluid from the second port toward the first port, and in the valve open position, the packing allows the first port and the second port to communicate with each other, and wherein, when the packing is at the valve closed position, the lip is able to be pressed and elastically deformed in a radially inward direction by the working fluid supplied from the second port, and separated away from the inner circumferential surface of the flow passage body, whereby the lip allows the working fluid to flow from the first port toward the second port. - View Dependent Claims (2, 3, 4, 5)
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Specification