Aseptomag® single-seat control valves are used for the exact setting and control of parameters such as flow, pressure, temperature, or filling level in UltraClean and Aseptic processing plants. The inverted control valve is specifically designed for installations where product enters the valve from the bellows side.
A welded stainless steel bellows is used to hermetically seal the product area from outside contamination and enables optimum process and product safety. In contrast to conventional control valves, the inverted control valve has its control contour on the side facing away from the bellows, so that it can be closed against the flow direction even in application processes where the product enters the valve on the bellows side. An electro-pneumatic positioner enables the precise positioning of the valve stem by controlling the pneumatic actuator.
The single-part housing with two chambers designed specifically for this control valve ensures that no mechanical interfaces outwards can endanger product safety on the negative pressure side, like it can occure at flash vessel applications. They are available with either two or three port connections. The valves are produced with standard butt-weld connections by default. Mixed port connection sizes, a divisible design for Internal Assemblies with an additional valve seat seal as well as various aseptic pipe connections are available upon request.
The internal assembly is designed without an additional valve seat seal by default. It includes a hemispheric control cone to enable smooth operation in a process and includes only one product-wetted seal. Designs with an additional valve seat seal are available upon request.
The standard version of the pneumatic actuator is designed as air-closing / spring-opening and results in a normally open failsafe position for inverted control valves.
Due to its solid construction, the GEA clamp enables a pressure stable and safe connection of the main components. The special design with three segments allows a service-friendly handling of the component, even under tight space conditions.
Positioner / Process Controller
Aseptic inverted control valves can be equipped with three different types of positioners. The closed centralized positioner (GRZ) is used by default and can be exchanged with either an open centralized positioner (ORZ) or a closed decentralized system (GRD). Depending on process requirements, it is also possible to apply a process controller instead of a positioner.
Higher closing pressures, other materials, higher surface qualities and higher operating temperatures are available upon request.