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Control valves for hygienic duties

30 January 2007

Among the key design requirements for control valves used in aseptic applications, such as food processing, is a cavity-free body design without crevices or ‘traps’ to ensure that the potential for bacteria growth is eliminated, the ability for effective CIP and SIP (Clean or Sterilised In Place) and a self-draining capability. Samson Controls offers a range of valves incorporating these features, which are manufactured to quality assurance systems certified to ISO 9001 and also meet stringent FDA requirements. The company's type 3347 control valve, for example, has polished steel parts and a special PTFE bushing along with an additional steam line connection that is used to prevent bacteria from spreading at the actuator stem guide. Another example is Samson's Type 3249 valve which is equipped with an EPDM diaphragm and a back-up safety packing box to protect against bacterial colonisation and prevent product leakage.

Process applications that involve pasty, fibrous or highly viscous products can be controlled by Samson’s Type 3345 cavity-free valve body, which features a diaphragm made of rubber, nitrile, butyl or PTFE. This diaphragm acts both as a seal and a valve plug.

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