Excess Flow Check Valve Glandless Piston Valve Safety Valve Excess Flow Check Valve Applications LPG , Butane etc. Used in tankers and unloading line End connection- screwed, flanged Type – Internal and external Size- ½”, ¾” & 1” Our Products ‹ › Contact Us Name Email Address Message 10 + 9 = Submit Describe your requirements in details, so we can get back to you soon.