FAQ-Product
Frequently asked questions
According to AD2000 data sheet A2 section 10.2, the narrowest flow diameter upstream of the valve seat has to be 6 mm. For sizes DN6 and DN8 the flow diameter of the safety valve SV15 is less than 6 mm. In this case, a shortened maintenance interval must be provided for these sizes and a gas & gas mixture in accordance with ISO8573-1:2010 (4:1:1) must be maintained.
According to AD2000 data sheet A2 section 12.4, the narrowest flow diameter for safety valves can be at least 4 mm when using clean gases if overdimensioning with a flow diameter >=6 mm leads to impairment of the function. In addition, interfering impurities should be safely excluded and the function of the safety valves must not be impaired (e.g. by packaging, icing or blockages).
The membrane-operated pressure reducing valve is frequently used in applications with low to normal back pressure. Due to the membrane, it also delivers more sensitive regulation.
The piston-operated pressure reducing valve is frequently used with high back pressures and aggressive media. It has an extremely robust design, giving it a high level of safety in case of pressure surges.
Direct acting normally closed solenoid valves actuate the magnet armature with a sealing element directly via the solenoid (they do not need minimum or differential pressure). The valve is sealed by the existing operating pressure, or at low pressure with an additional compression spring (the spring force must be great enough to securely close the valve at an operating pressure of 0 bar). When voltage is applied to the solenoid, the magnet armature is tightened and the valve opens. In doing so, the force of the operating pressure and the closing spring must be overcome.
| Soledoid valve closed: | Solenoid valve open: | Advantages: |
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- No pressure differential required - Function from 0 bar - Less sensitive to contamination - Simple design - Fast switching times |
Direct acting solenoid valves from NieRuf are available here.
No, calibration is not possible for these devices.
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