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US 10,371,270 B2Granted
Diaphragm valve
AssigneeFujikin Incorporated
InventorsTakashi Funakoshi, Tadayuki Yakushijin, Tomohiro Nakata
Life of this patent
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Abstract
Provided is a diaphragm valve that improves the durability of a diaphragm by focusing on the ratio of the radius of curvature of a pressing surface of a diaphragm presser to the radius of curvature of the diaphragm. SRb/SRa=0.4 to 0.6 is satisfied, wherein SRa represents the radius of curvature of a diaphragm 5 and SRb represents the radius of curvature of a pressing surface of a diaphragm presser 6.
Claims5
A diaphragm valve comprising:
- a valve body provided with a fluid channel;
- a valve seat provided on a peripheral edge of the fluid channel;
- a diaphragm having a spherical surface and configured to be pressed against or separated from the valve seat to close or open the fluid channel;
- a diaphragm presser having a lower end that has a spherical surface and serves as a pressing surface and configured to press the diaphragm;
- and
- an actuator configured to move the diaphragm vertically;
- wherein SRb/SRa =0.4 to 0.6 is satisfied, where SRa represents a radius of curvature of the diaphragm and SRb represents a radius of curvature of the pressing surface of the diaphragm presser.
4 more elements
Dependencies are inferred from the claim text.