is retracted opening the valve assembly 10 an indicator rod 76 extends from the end of the actuator assembly 70 signaling that the valve assembly 10 is in a valve open condition although shown herein as a hydraulically actuated valve the invention is not intended to be limited as such and it is contemplated that actuation could be accomplished by any standard means such as manual or pneumatic actuation the linings 50 60 form a modular replaceable interlocking lining system the linings 50 60 are formed of rigid lining materials formed to removably slide into the valve body and do not need to be molded or bonded to the valve body as best shown in fig6 the valve 10 is assembled by slidably inserting the first lining 50 into the outlet end 32 of the first body portion 30 such that the first lining 50 extends from the outlet end 32 to the actuator attachment end 34 of the first body portion 30 lining 50 is oriented such that aperture 52 is aligned with the second body portion lining 50 includes a lining flange 54 that registers against a corresponding recess 38 in the outlet attachment flange 32 of the first body portion 30 and acts to axially locate the lining 50 in the first valve body portion 30 it is noted that the lining flange 54 extends slightly beyond the outlet end 32 to ensure a proper seal with the lining of the adjacent piping not shown the lining flange 54 can also be used to aid.