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SQ253 Valve Combination 4.3 Compressed-air solenoid valves This 2/2 solenoid valve is closed in the unenergized state (action Type A). It is suitable for neutral gases and liquids which do not attack the housing material. The sealing material is labeled behind the nominal width on the name-plate (B = NBR, A = EPDM, F = FPM). Fig. 5 Compressed-air solenoid valve Copyright ® SIEMENS Page 68 04/04
SQ253 Valve Combination 4.3.1 Replacing the valves • Pull off the cable head after loosening the screw. • Loosen screwed joints on the housing. • Unscrew the pipes at both ends. • Before fitting the new valve Note: Pay attention to voltage and type of current according to the nameplate. • Clean the pipe work of contamination (metal swarf, sealing material). Note: The arrow indicates the direction of flow. Do not use the valve as a lever when screwing it in. Do not block pilot hole on the valve output with pipe ends, sealing material, etc. Use PTFE tape as sealing material. • Assembly takes place in the reverse sequence. 4.3.2 Cleaning the valve • Pull off the cable head after loosening the screw. • The pilot valve can be removed after loosening the four screws on the solenoid section. • Take care with the core and spring. • Loosen four screws on the valve cover. • Remove the upper part. • Take out the diagram and, if necessary, clean it and replace damaged parts. • The valve body can now be cleaned. • Grease with silicone grease or acid-free Vaseline. • Assembly takes place in reverse sequence. Note: Observe the tightening torque of 1Nm for the cable head. 4.3.3 Faults: • Check connections. operating pressure and voltage. • Pilot hole on the valve output covered or contaminated ? Solenoid does not pull in: • Short circuit or coil interruption. • Core or core aperture contaminated. • With alternating current, jammed core causes coil overheating. Leaky valve: • Procedure as under Section 4.3.2 SQ253 Valve Combination Copyright ® SIEMENS Page 69 04/04
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FLK Gas Sampling System Operating M
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SQ250 FLK Gas Sampling System 1. In
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SQ250 FLK Gas Sampling System Fig.
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