US 12,146,574 B2
Flow rate control valve
Masahiro Hayama, Tokyo (JP); Toshinori Kanzaki, Tokyo (JP); Keichi Urushiyama, Tokyo (JP); Kohei Fukudome, Tokyo (JP); and Keigo Shirafuji, Tokyo (JP)
Assigned to EAGLE INDUSTRY CO., LTD., (JP)
Appl. No. 18/017,825
Filed by EAGLE INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Jul. 27, 2021, PCT No. PCT/JP2021/027766
§ 371(c)(1), (2) Date Jan. 24, 2023,
PCT Pub. No. WO2022/030311, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-132384 (JP), filed on Aug. 4, 2020.
Prior Publication US 2023/0272859 A1, Aug. 31, 2023
Int. Cl. F16K 1/36 (2006.01); F16K 1/38 (2006.01); F16K 1/54 (2006.01); B60H 1/32 (2006.01)
CPC F16K 1/36 (2013.01) [F16K 1/38 (2013.01); F16K 1/385 (2013.01); F16K 1/54 (2013.01); B60H 2001/3275 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A flow rate control valve, comprising:
a valve housing; and
a valve body to be driven by a drive source,
wherein the flow rate control valve is configured to control a flow rate of a fluid flowing through a through-flow passage in a direction opposite a closing direction of the valve body, by moving the valve body from a control region to a closing region,
the valve housing has a large diameter hole and a small diameter hole which communicates with the large diameter hole in an axial direction,
the through-flow passage is defined by the valve body, the large diameter hole and the small diameter hole,
a valve seat is provided at a border between the large diameter hole and the small diameter hole,
the valve body includes a contact portion which is brought into contact with and separated from the valve seat, and a corner portion which is provided at an edge of an outer peripheral surface of the valve body,
the contact portion of the valve body and the valve seat cooperatively form a closing portion,
an inner peripheral surface of the large diameter hole and the corner portion of the valve body cooperatively from a throttle portion,
the closing region is a stroke range of the valve body in which an opening area of the throttle portion is larger than an opening area of the closing portion,
the control region is a stroke range of the valve body in which the opening area of the throttle portion is smaller than the opening area of the closing portion,
the valve body has an effective pressure-receiving area where a pressure of the fluid acts on the valve body, the effective pressure-receiving area being switched, in accordance with a movement of the valve body in the axial direction, between a control regional effective pressure-receiving area that exists when the valve body is positioned in the control region and a closing regional effective pressure-receiving area that exists when the valve body is positioned in the closing region, and
the closing regional effective pressure-receiving area is smaller than the control regional effective pressure-receiving area.