The Cla-Val Pacific Model 100-21 is a hydraulically operated, diaphragm actuated, globe or angle pattern valve. It consists of four major components: the body, intermediate chamber, diaphragm assembly and cover. The diaphragm assembly is the only moving part. The Model 100-21 is receommended where ndependent operating pressure is desired. The valve's packless construction and simplicity of design assures long life and dependable operation.