VALVE DEVICE

• US 20190316686A1
• Filed: 06/26/2019
• Published: 10/17/2019
• Est. Priority Date: 01/16/2017
• Status: Active Grant

• Current Assignee: TLV Co., Ltd.
• Original Assignee: TLV Co., Ltd.
• Inventors: OIKE, Tadashi
• Granted Patent: US 11,015,718 B2
• Time in Patent Office: Days
• CPC Class Codes: F16K 1/42 Valve seats for double-seat valves F16K1/44
• CPC Class Codes: F16K 25/00 Details relating to contact between valve members and seats movement of valve members other than for opening and closing F16K29/00
• CPC Class Codes: F16K 31/002 actuated by temperature variation thermo-electric F16K31/025
• CPC Class Codes: F16K 31/18 actuated by a float floats F16K33/00; float-actuated valves in steam-traps F16T1/20, in boilers F22D5/08
• CPC Class Codes: F16K 31/22 with the float rigidly connected to the valve
• CPC Class Codes: F16T 1/10 by thermally-expansible liquids
• CPC Class Codes: F16T 1/22 of closed-hollow-body type
• CPC Class Codes: F16T 1/38 Component parts; Accessories valves in general F16K

Abstract

A drain trap includes: a casing having a fluid channel; and a second valve mechanism including a second valve seat having a seat surface in a ring shape and a second valve body configured to be displaced to be separated from and seated on the seat surface of the second valve seat so that and the second valve mechanism opens and closes the channel The second valve seat is held to be movable back and forth along a center axis of the ring shape such that the seat surface of the second valve seat and the seat surface of the second valve body are separated from each other and contact each other, and is held to be rotatable about the center axis of the ring shape.

Claims

1. A valve device comprising:

a casing having a channel for fluid; and

a valve mechanism including a valve seat having a seat surface in a ring shape and a valve body configured to be displaced to be separated from and seated on the seat surface of the valve seat so that the valve mechanism opens and closes the channel, wherein

the valve seat is held to be movable back and forth along a center axis of the ring shape such that the seat surface of the valve seat and the seat surface of the valve body are separated from each other and brought into contact with each other, and

the valve seat is held to be rotatable about the center axis of the ring shape.

2. The valve device according to claim 1, wherein

the valve mechanism includes

a driving shaft that is coaxially provided with the center axis of the ring shape and is coupled to the valve seat, and

a retention member that is screwed to the driving shaft and holds the driving shaft, and

the valve seat is moved back and forth and rotated by rotating the driving shaft.

3. The valve device according to claim 2, wherein

the valve mechanism includes an elastic member that is elastic along the center axis of the ring shape and holds the valve body directly or indirectly.

4. The valve device according to claim 2, wherein

the valve mechanism includes

a driving portion that holds the valve body and is displaced in accordance with a temperature of the fluid so that the valve body is displaced along the center axis of the ring shape to be separated from and seated on the seat surface of the valve seat, and

an elastic member that is elastic along the center axis of the ring shape and holds the driving portion.

5. The valve device according to claim 1, wherein

the valve seat has a substantially tubular end surface serving as the seat surface in the ring shape, is coupled to the driving shaft by a coupling pin extending orthogonally to the center axis of the ring shape, and is rotatable about the coupling pin.

6. The valve device according to claim 1, further comprising

a restriction member that restricts an amount of displacement of the valve body caused by forward movement of the valve seat.

7. The valve device according to claim 4, wherein

the casing includes a fluid reservoir having an upper portion to which the channel is connected and a lower portion in which a valve hole is formed,

the valve device further comprises

a float that is housed in the reservoir and rises and lowers in accordance with a storage level of fluid in the reservoir to thereby open and close the valve hole, and

a restriction member that is disposed above the float in the reservoir and restricts rising of the float to a height greater than or equal to a predetermined height,

the valve mechanism is disposed above the restriction member such that the center axis of the ring shape coincides with a top-bottom direction, and that the seat surface of the valve seat contacts the seat surface of the valve body by downward movement of the valve seat, and

the driving portion is displaced downward to contact the restriction member so that the restriction member thereby restricts an amount of downward displacement of the driving portion.