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US 2020/0049263 A1Published application
Control valve
AssigneeYamada Manufacturing Co., Ltd.
InventorAkifumi Ozeki
Life of this patent
Estimating the term…
Abstract
A control valve includes a valve housing, a joint member, a valve body, and a sealing tube member. The sealing tube member has a biasing pressure receiving surface that receives a pressure of a liquid inside the valve housing and biases the sealing tube member to the valve body side. An area S1 of the biasing pressure receiving surface and an area S2 of a valve sliding contact surface of the sealing tube member are set to satisfy Expressions (1) and (2), S1<S2≤S1/k (1) α≤k<1 (2) where k is a pressure reduction constant of a liquid flowing through a minute gap between the valve sliding contact surface and the valve body, and α is a lower limit value for the pressure reduction constant determined based on physical properties of a liquid.
Claims8
A control valve comprising:
- a valve housing which has an inflow port for causing a liquid to flow in from outside and a discharge port for discharging a liquid that has flowed in to the outside;
- a joint member which is joined to a circumferential edge of the discharge port;
- a valve body which is rotatably disposed inside the valve housing and has a circumferential wall portion in which a valve hole for communication between the inside and the outside is formed;
- and
- a sealing tube member in which one end side is held by the joint member in a state of communicating with the discharge port, and a valve sliding contact surface slidably abutting an outer surface of the circumferential wall portion at a position where at least a part of the valve body overlaps a rotation path of the valve hole is provided on the other end side,
- wherein the valve body allows an outflow of a liquid to the discharge port from an inner region of the circumferential wall portion when at a rotation position where the valve hole and the sealing tube member are allowed to communicate with each other, and the valve body controls or blocks an outflow of a liquid to the discharge port from the inner region of the circumferential wall portion when at a rotation position where the valve hole and the sealing tube member are inhibited from communicating with each other,
- wherein the sealing tube member has a biasing pressure receiving surface which receives a pressure of a liquid inside the valve housing and biases the sealing tube member to the valve body side, and
- wherein an area S1 of the biasing pressure receiving surface and an area S2 of the valve sliding contact surface of the sealing tube member are set to satisfy Expressions (1) and (2),
- S1<S2≤S1/k (1)
- α≤k<1 (2)
- where k:
- a pressure reduction constant of a liquid flowing through a minute gap between the valve sliding contact surface and the valve body, and
- α:
- a lower limit value for the pressure reduction constant determined based on physical properties of a liquid.
11 more elements
A control valve comprising:
- a valve housing which has an inflow port for causing a liquid to flow in from outside and a discharge port for discharging a liquid that has flowed in to the outside;
- a joint member which is joined to a circumferential edge of the inflow port;
- a valve body which is rotatably disposed inside the valve housing and has a circumferential wall portion in which a valve hole for communication between the inside and the outside is formed;
- and
- a sealing tube member in which one end side is held by the joint member in a state of communicating with the inflow port, and a valve sliding contact surface slidably abutting an outer surface of the circumferential wall portion at a position where at least a part of the valve body overlaps a rotation path of the valve hole is provided on the other end side,
- wherein the valve body allows an inflow of a liquid to an inner region of the circumferential wall portion from an upstream portion of the inflow port when at a rotation position where the valve hole and the sealing tube member are allowed to communicate with each other, and the valve body controls or blocks an inflow of a liquid to the inner region of the circumferential wall portion from the upstream portion of the inflow port when at a rotation position where the valve hole and the sealing tube member are inhibited from communicating with each other,
- wherein the sealing tube member has a biasing pressure receiving surface which receives a pressure of a liquid in the upstream portion of the inflow port and biases the sealing tube member to the valve body side, and
- wherein an area S1 of the biasing pressure receiving surface and an area S2 of the valve sliding contact surface of the sealing tube member are set to satisfy Expressions (1) and (2),
- S1<S2≤S1/k (1)
- α≤k<1 (2)
- where k:
- a pressure reduction constant of a liquid flowing through a minute gap between the valve sliding contact surface and the valve body, and
- α:
- a lower limit value for the pressure reduction constant determined based on physical properties of a liquid.
11 more elements
Dependencies are inferred from the claim text.