VARIVENT® CONTROL VALVES

To ensure an economical system productivity, it is necessary to keep the operation, maintenance and servicing costs at a minimum. At the same time, increasing cost pressure leads to higher expectations toward technology, quality and service and more comprehensive and stringent statutory provisions.

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The VARIVENT® system’s modular design makes it possible to individually adjust control valves to specific process requirements. This results in economic efficiency for the system operator, optimized stock keeping, and cost-effective spare parts production due to the low diversity of parts.
 
The integration of the control valves into the process control technology has a decisive impact on the quality of the control and the product. Preventive maintenance of the control valves ensures the system's high availability.

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General Advantages

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• Proven seal technology

• Dead-zone-free VARIVENT® housing

• Maximum cleaning efficiency

• Low spare part stocks

• Positioner for a large variety of requirements

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Valve Function

 

Control valves serve as actuators in control loops. In this process, the particular control valve works as a throttle device that sets the desired flow rate by changing the pressure loss in a pipeline.

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Technical Design

 

The linear or equal percentage control cone and the corresponding valve seat are located in the completely cleanable, dead zone-free VARIVENT® housing. The exchangeable seat ring with an associated control cone allows the selection of several KVS values (= discharge coefficient) per nominal width; subsequent adjustments to changes in the operating conditions are possible at any time. All control cones are available in either a soft- or a metallic-sealing version.

The open lantern allows easy detection of potential leakages due to a defective stem seal.

Detachable clamp connections between the individual modules enable the control valve's quick assembly and maintenance. The valves are available in both effective directions, spring-to-close (NC) and spring-to-open (NO).

Positioners determine the valve's stroke with a high level of accuracy; a variety of designs allows for ideal integration into the process control.

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Application Examples

 

The need for strict adherence to standards in food production requires that control valves be designed to comply with the food and beverage industry’s maximum hygiene demands.

In the manufacture of drugs by the pharmaceutical industry and in chemical process systems or in the technical use of enzymes, cells and microorganisms, any contamination would endanger the process results as well. Therefore, the application of dead zone-free control valves is required, which can be cleaned efficiently and without leaving residue.

VARIVENT® valves enable germ-free processes. The control valves meet high hygiene requirements and allow the cleaning of pipes according to the efficient CIP or SIP procedure.

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Control valves are used for pressure regulation, flow control, or for the mixing of liquids. Typical applications include: Temperature control in heat exchangers, tank pressure control, wort aeration, or the dosing of a variety of different media. A number of different control valves is available that are adjusted to various control tasks.