AirSense 3/4" Large 2 way ball valve

When the aspirating smoke detection system is installed in a dirty or dusty environment, the sampling pipes and sampling holes may become obscured over a period of time by various airborne particles. It is therefore recommended to clean the sampling pipes and holes by blowing low pressure, compressed air in reverse direction through the sampling pipes. 

The quick release airline valve is installed close to the detector. During maintenance, the detector can be switched-off and the valve closed to prevent any damage to the detector during the clearing process. The low pressure compressed air can now be easily connected to the quick release. At the far end of the sampling pipe, the ¾” large check valve or ¾” large 2-way ball valve can be used. The check value is the easiest as it will automatically open to release excess pressure during the cleaning process and does not require human interaction. In some cases, the check valve might not be suitable so then the 2-way ball valve may be used to manually open the far end of the sampling pipe."

The airline should never be turned on without first closing the valve to protect the ASD. The ABS ball valve is a 15 bar rated valve along with the pipes and fittings. However, the cement and jointing procedures used on aspirating installations is low pressure and not rated at 15 bar. Excessive pressure should not be used to blow the dust from the pipe system. Pressure will naturally be lost through the holes in the system or by pre-installing a check valve/air release valve (9-10978) at the end of the pipeline in order to allow excessive air pressure to be released from the end of the pipeline. Only a minimal amount of pressure is required to blow dust out. It is recommended that the 9-10980 is used in conjunction with the 9-10976 Quick Release airline valve (where the 9-10978 is not suitable).