Patent Number: 6,167,902

Title: Bottom entry cryogenic valve

Abstract: An improved bottom entry cryogenic valve, with single piece cast body, that provides for easy and efficient removal of the valve stem and valve seat components without removing the valve body from the fluid circuit. The valve body forms the housing and has a top end, a main body section and a bottom entry end. The main body section has fluid entry and fluid exit openings. A bonnet nut is attached to the valve body top end. A body ring is attached at the bottom entry end. A valve stem extends axially through the bonnet nut, with a top portion exposed with a hand wheel attached thereon. The valve stern has a mid portion, a flange portion and a threaded bottom end located in the main body section of the valve body. The valve stem mid portion supports a valve seal member and a seal nut/bearing. The valve seal member is to prevent fluid from flowing through the valve body when the valve is in a closed position. The seal nut/bearing acts to restrict fluid from entering the top end portion of the valve body. The body ring acts to seal the valve body at the bottom entry end. The valve stem together with valve seal and seal nut/bearing supported thereon may be removed, as a unit, for repair or replacement.

Inventors: Nelson; Donald R. (Worcester, MA)


International Classification: F16K 41/00 (20060101); F16K 31/44 (20060101); F16K 31/50 (20060101); F16K 41/02 (20060101); F16K 51/02 (20060101); F16K 031/50 (); F16K 041/04 ()

Expiration Date: 01/02/2018