Carten Controls carten, valves, clean room, ultra high purity, semiconductor, cleanroom, automatic control equipment, brass, stainless, steel, ireland, waterford, europe, zero dead space, no leakage, killer particle entrapment, fab, process control, ISO 9002, electronics, semicon Carten is recognised as a global leader in the design and manufacture of ultra high purity gas valves and system components for the Semiconductor industry.