The object of the present invention is to provide a bronze-based alloy of low lead content, first improved in tensile strength at high temperatures, secondly contributing to the promotion of the environmental conservation including recycling, while avoiding the adverse effect of lead on human bodies by means of ...

Provided is a seal structure for a butterfly valve with which sealing characteristics near a valve vane are improved and an increase in operating torque is prevented by suppressing a force that deforms a resin lining layer during operation when the valve is closed said butterfly valve being openable/closable while e...

The objective of the present invention is to provide a lined butterfly valve which has excellent chemical resistance and heat resistance, and with which, even if provided with a large aperture, penetration and permeation of liquid is prevented by ensuring that there is an adequately thick lining layer on a metal cor...

Provided is a lined butterfly valve that is corrosion resistant to fluids that simultaneously improves top and bottom sealing properties and shaft sealing properties so as to reliably prevent leaks and that is capable of maintaining said sealing properties even if a disc moves to the secondary side due to fluid pres...