Title:
MOTOR-OPERATED VALVE
Document Type and Number:
Japanese Patent JP2022103524
Kind Code:
A
Abstract:
To enable a motor-operated valve to highly accurately control flow volume at low flow volume and to prevent an increase in the amount of leakage from the valve due to the intrusion of foreign matters.SOLUTION: The motor-operated valve comprises: a valve body 11 comprising, in the inside thereof, a valve chest, a valve port 18 and a valve seat 17; a valve element 19 moving forward and backward with respect to the valve seat thereby controlling the passage amount of fluid; a first flow path port communicated with the valve chest via the valve port; a second flow path port communicated with the valve chest; and an electric drive unit driving the valve element, wherein the valve element comprises a needle portion 19a having an inversely conical shape with its diameter gradually smaller toward the valve seat, and adapted to be inserted into the valve port during closing the valve when the valve element is seated on the valve seat, to thereby close the valve port. An angle θ formed by opposed bus bars of the needle portion is 26° or larger and smaller than 45°, and a coating layer 62 mainly formed of fluorine resin (for example, PTFE) is provided on the surface of each of the needle portion and the valve seat. Furthermore, a high-strength base layer (for example, Ni-P plating layer) 61 is provided between the coating layer and each of parent materials 63, 64.SELECTED DRAWING: Figure 3
More Like This:
| WO/2001/081802 | ELECTRIC ACTUATOR FOR FLUID CONTROL VALVES |
| JP2000074244 | FLOW CONTROL DEVICE |
Inventors:
AIHARA HIROKI
ARAI RYOTA
ARAI RYOTA
Application Number:
JP2020218216A
Publication Date:
July 08, 2022
Filing Date:
December 28, 2020
Export Citation:
Assignee:
FUJI KOKI KK
International Classes:
F16K31/04; F16K1/38
Domestic Patent References:
| JPS5028029A | 1975-03-22 | |||
| JP2012197849A | 2012-10-18 |
Attorney, Agent or Firm:
Nashiko Masuko