US 12,486,909 B2
Fluid control valve and method for manufacturing the same
Hiroyuki Murase, Komaki (JP); Atsushi Tsuneduka, Komaki (JP); and Mayuko Okada, Komaki (JP)
Assigned to CKD CORPORATION, Komaki (JP)
Filed by CKD CORPORATION, Komaki (JP)
Filed on May 2, 2023, as Appl. No. 18/142,450.
Claims priority of application No. 2022-084617 (JP), filed on May 24, 2022.
Prior Publication US 2023/0383853 A1, Nov. 30, 2023
Int. Cl. F16K 7/17 (2006.01); F16K 7/16 (2006.01); F16K 31/122 (2006.01); B23K 26/21 (2014.01); B29C 48/255 (2019.01); F16K 41/12 (2006.01)
CPC F16K 7/17 (2013.01) [F16K 7/16 (2013.01); F16K 31/1221 (2013.01); B23K 26/21 (2015.10); B29C 48/255 (2019.02); F16K 41/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A fluid control valve comprising:
a flow passage for flowing a control fluid;
an annular valve seat provided in the flow passage;
a diaphragm assembly configured to contact with or separate from the annular valve seat to control a flow of the control fluid; and
a drive shaft that is located coaxially with the annular valve seat and moves the diaphragm assembly in a direction to contact with or separate from the annular valve seat, wherein the diaphragm assembly comprises:
a shaft member coupled on one side to an end of the drive shaft on a side near the annular valve seat;
a membrane member made of perfluoro alkoxy alkane and positioned in surface contact with an end face of the shaft member on an opposite side from the one side coupled to the drive shaft; and
a weld part that is formed in a shape of a string of beads in a cross-section by laser welding, which is performed by irradiating a laser beam onto the membrane member so that the laser beam passes through the membrane member, at an interface between the shaft member and the membrane member and joins the shaft member and the membrane member,
the shaft member is made of fluorine resin containing a carbon-based additive dispersed,
the weld part is formed of a weld mark with a diameter gradually increasing from a center of the weld part toward an outer circumferential side,
the weld mark is formed such that portions adjacent in a radial direction overlap each other so that a portion of the weld mark, located on the outer circumferential side, overlaps an outer edge of another portion located on an inner circumferential side,
the radial direction is perpendicular to the direction in which the diaphragm assembly contacts with or separates from the annular valve seat,
the membrane member includes a contact portion in a surface on an opposite side from a side facing the shaft member, and the contact portion will contact with the annular valve seat, and
the weld part is located at least on a back side of the contact portion.