Accurate control valve for sterile applications

17 July 2017

The GEMÜ 567 BioStar control valve is said to offer a safe solution for media control of small quantities of fluid – from 0.08 to 4.1 m³/hr.

Sealing takes place via a PTFE diaphragm with PD technology (plug diaphragm), which is said to combine the advantages of a diaphragm valve with those of a globe valve. This valve is available with linear control characteristics and with equal-percentage control characteristics.

Aseptic diaphragm valves are frequently used as control valves for sterile applications. This means that small volumes can only be controlled with an inadequate level of accuracy. The new 2/2-way diaphragm globe valve, with regulating needle or regulating cone, fills these gaps. The actuator is sealed by an FDA-compliant and USP Class VI compliant PTFE diaphragm. In combination with a spring washer, this ensures that the seal is permanently temperature-resistant, meaning that the diaphragm need not be re-tightened. In comparison with bellows valves, cleaning the valve is significantly improved by the hygienic construction.

An optional feature of the unit is the inclusion of an integrated bypass function and the potential installation of the diaphragm globe valve in a multi-port valve block (GEMÜ M-block). In the bypass version, the angle valve body can be designed with a manually operated bypass or with a pneumatically operated bypass. Both versions allow for easier cleaning and greater flows. 

The valve is also suited to use in hygienic safety applications. It meets the standards of the EHEDG cleaning test and the standards in accordance with the American 3A definition. 

The control valve is used, for example, for dosing small quantities in the beverage industry for in-line mixers (for example, for vitamins, dyes and other additives), for controlling sterile steam and air (for example, for DIP processes) or for controlling the inflow and outflow of bioreactors in the pharmaceutical industry

The GEMÜ 567 BioStar control is available in the nominal sizes DN 8 to DN 20. The body is manufactured, as standard, from block material with a grade of surface finish of Ra 0.4 µm.

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