Title:
BALL VALVE
Document Type and Number:
Japanese Patent JP2019049333
Kind Code:
A
Abstract:
To provide a ball valve that can stabilize operation torque of a valve element at desired torque, and can reliably prevent inner fluid from leaking.SOLUTION: A ball valve 1 comprises: a valve element 2 of which an outer surface is a spherical surface, and comprising a through hole; a thermoplastic resin-made valve casing 3 comprising a drum part 31 comprising a valve element housing part in which the valve element is housed, and a side part 32 integrated with the drum part 31; and a seat ring 4 fitted between the outer surface of the valve element 2 and an inner surface of the valve casing 3. The drum part 31 comprises an outer cylinder part 312. The side part 32 comprises an inner cylinder part 321 inserted into the outer cylinder part 312. In the drum part and the side part, an inner surface of the outer cylinder part 312 and an outer surface of the inner cylinder part 321 are melted and integrated.SELECTED DRAWING: Figure 1
Inventors:
NAGAHISA RYOSUKE
NIWA HIROKAZU
KATAYAMA YOSHIO
NIWA HIROKAZU
KATAYAMA YOSHIO
Application Number:
JP2017174448A
Publication Date:
March 28, 2019
Filing Date:
September 12, 2017
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
F16K27/10; F16K5/06; F16K27/00; F16K27/06
Domestic Patent References:
| JPS60147863U | 1985-10-01 | |||
| JPH01176274U | 1989-12-15 | |||
| JPH10306881A | 1998-11-17 | |||
| JPH1038116A | 1998-02-13 | |||
| JP2007120769A | 2007-05-17 |
Foreign References:
| CN2775424Y | 2006-04-26 |