Needle valves provide proportional opening to needle travel for more accurate metering applications and other fine adjustment flow control applications. Special design PTFE seal eliminates elastomer type seals or O-rings that can contribute to chemical compatibility problems. PVC, CPVC and Polypropylene valves are available with 1/4 in, 3/8 in and 1/2 in NPT female threaded ends in either standard globe pattern or special angle pattern configuration that eliminates need for additional elbow in various system setups.