This Standard Practice establishes requirements for plastic industrial ball valves in sizes NPS 1/2 to NPS 4@ designed for general industrial systems for the distribution of pressurizes liquids that are chemically compatible with the piping material. It reflects the industry practice of design@ manufacture@ and application of these valves. This Standard Practice applies to valves having the ball seal against two self lubricating seats of the following types: a) Union Ball Valves All joint ends have detachable nuts and end connectors; b) Single Union Ball Valves Only one joint end as detachable nuts and end connectors@ with the other joints being integral to the valve body; c) Non Union Ball Valves All joint ends are integral to the valve body. This Standard Practice covers the following: a) Pressure-Temperature Ratings and Design Requirements b) Port Sizes c) Tests d) Markings e) Commonly Used Laying Length Dimensions f) Actuator Application Requirements