L6579 Series

The 7590U and 7591U Chek-Loks® are also designed for use on permanent installations provided the excess flow valve is sized properly for the system and piping. The Chek-lok® contains a weak section underneath the outlet threads to protect the container from a pull away incident. Any undue stress could cause this weak section to shear unintentionally if not properly supported and installed. NOTE: In some cases, it may be necessary to use an in-line excess flow valve to protect the downstream piping. This valve is not recommended for use as a liquid source for pumps.