(Click to enlarge image) Chemline Type 58 Butterfly Valves are designed for ON/OFF and throttling control applications in heavy industries. They have a large size range, 1-1/2” to 24”. All sizes have Polypropylene (PP) bodies as standard, offered at prices competitive with similar PVC body valves. A higher pressure/temperature safety factor is a bonus especially for hazardous services. Prices are much lower than similar PP body valves. A choice of disc and seat materials is available as well bodies in PVDF.