Eliminating areas that might increase the potential for bacterial growth, such as traps and crevices, is important in the design requirement for control valves used in aseptic applications. This firm offers a range of valves (photo) that incorporate these features. The Type 3347 control valve, for example, has polished steel parts to ensure the highest purity for the process medium, special PTFE bushing and an additional steam line construction that prevents bacteria from spreading at the actuator stem guide. The Type 3249 is equipped with an EPDM diaphragm and a backup safety packing box. Finally, the Type 3345 cavity-free valve body features a diaphragm made of either rubber, nitrile, butyl or PTFE, which acts both as a seal and a valve plug. — Samson Controls Ltd., Redhill, U.K.