Voith I/H converter modules are redundant dual/duplex current-to-pressure converters (DX-CPC), which adjust hydraulic positioning cylinders by means of a pilot valve in processes requiring high availability. The positioning cylinders operate a valve that controls the mass flow needed to drive machinery. The pressure control module provides very precise and high dynamic control of the mass flow. An I/H converter module consists of two I/H converters connected in parallel. The I/H converter changes a constant input pressure into a variable output pressure. A standard 4 – 20 mA signal specifies the output pressure. The major components of the I/H converter are a hydraulic unit and a force-controlled electromagnet.

Every I/H converter has a monitoring circuit that detects a malfunction of the converter. In the event of converter malfunction, a hydraulic maximum selection circuitry ensures that the other I/H converter assumes control automatically. This makes it possible to remedy the cause of the malfunction during operation. The Mean Time Between Failure (MTBF) for a Voith pressure control module is over 20,000 years. Your equipment runs for an exceptionally long period of time without unplanned downtime thereby ensuring increased productivity.

Advantages and benefits

-Thanks to the redundancy provided by the two I/H converters, the Mean Time Between Failure (MTBF) for the pressure control module is over 20,000 years. Your equipment operates with maximum availability. Productivity increases and the costs associated with lost production remain low

-It is possible to replace a faulty I/H converter during operation. You avoid unplanned downtime and their associated high costs

-Voith pressure control modules are not sensitive to contaminated pilot oil. Turbine lubricating oil is suitable as the operating fluid. One oil supply system for both lubricating and pilot oil suffices. -Maintenance is simple, which helps you lower operating costs

-Exceptional control response, almost no hysteresis, and a resolution better than 0.1% ensures very fast and accurate control. You benefit from having a stable process with high product quality

-Low system integration costs as connections are industry-standard which means the I/H converter module can be easily integrated into your equipment. Standard adapter plates are available to allow the I/H converter module to interface with systems designed for Woodward CPC and CPC-II converters

-The output pressure range can be adjusted easily on-site by means of potentiometer which allows you to adjust the output pressure for the application quickly and without any delays

-For use in hazardous areas, we offer certified explosion proof pressure control modules

Typical fields of use

-Control valve operations within:

--Steam turbines

--Gas turbines

--Compressors

-Retrofit of mechanic-hydraulic valve controls

-Upgrade of systems with Voith DSG I/H converters

-Upgrade of systems with partially or non-redundant Woodward CPC or CPC-II converters

Voith DSM I/H converter

DSM-B05XXX

DSM-B10XXX