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Our special service for you: Some interesting things about valve technology

Would you like to know more about valve technology? We would be more than happy if you take advantage of the information that we have compiled just for you. If you have any further questions about particular topics, we’re always happy to help. If you are interested, please call us or send us an email.
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Here we go! 

Direct-acting solenoid valves 


The valve is opened or closed directly by the solenoid system No operating or differential pressure is required. The valve can be activated from 0 bar pressure onwards.

The sealing element must be raised from its seat against operational and spring pressure exclusively by solenoid action.

ilot-operated solenoid valves


The force of pressure from the medium is required for opening and closing the valve. Pressure from the medium or local differential pressure raises the sealing element.

This activation method enables the use of solenoids with relatively low power in situations with high flow rates and relatively high pressures.

Force-pilot-operated solenoid valves 


This activation method represents a combination of direct-acting and pilot-operated valves. This activation method unites both advantages (no differential pressure and high flow rates / high pressures).

The valve can be activated from 0 bar pressure onwards. The actuator opens a pilot orifice and then lifts the sealing element from its seat directly or supported by the differential pressure (delta p) of the operating pressure.


Pressure-controlled valves

Activation is initiated by an external pilot valve mounted either on the actuator or the control feed line. In the case of clean power sources (e.g. compressed air or hydraulic oil) valve activation is relatively independent of high temperatures, high operating pressures and contaminated media.


RSG control valves


Regulating valves are activated by electromotive power or with the aid of compressed air. Here, a control signal, usually 0–10 V, is switched to the operating range of the valve. This allows regulation of the medium-pressure or the flow.

A special case is our pressure relief valve. Here, tensioned springs and compressed air create a preload force that counteracts the hydraulic pressure force of the operating medium. The valve opens and diverts excess pressure to the tank when the pressure of the operating medium exceeds the preload force. The preload force value may be set either manually with a pressure reducing valve or with the aid of a pneumatic proportional valve.


RSG coaxial valves

Are either direct acting or pressure-controlled and are therefore a variant of the classical activation methods. A particular feature is their axial construction. This enables the control of relatively high pressures with simultaneously high flow rates. Coaxial valves are employed for the control of gaseous, abrasive, viscose and gelatinous media.