Manufacturers of check valves and pressure relief valves for hydraulic and pneumatic compressors are constantly looking for ways to improve the performance of their products. Valve performance, more than any other component, determines compressor efficiency. To achieve improvements such as reduced fluid leakage, noise reduction, longer valve life, and cost reduction, a number of manufacturers are turning to Performance Plastics Ltd. (PPL), a high performance injection molding specialist, for assistance. To meet the requirements, PPL suggests replacing the metal poppets in the valves with poppets made of VICTREX® PEEK™ polymer, a high performance thermoplastic. Substituting plastic for metal maintains strength while improving corrosion resistance, reducing weight, and allowing for greater design flexibility.