The VACOMASS® square diaphragm control valve is a technically optimized sliding gate control valve with gas-tight shut-off and a square control aperture. It is used for precise and low-loss control of airflow and distribution in the aeration tanks of a wastewater treatment plant. The valve has a falling flow axis to achieve sensitive control of normal and tangential flows (e.g. after elbows) and is designed according to DIN EN 60534-2-3.
Within the usual control range the valve has a control curve that is proportional to the open area, and it can be used from 0-100% stroke. It is designed to have a pressure loss of less than 10 mbar at full load and 100% stroke.
The control valve body consists of two halves that are designed to be of wafer or end-of-line type. The inner surface has a groove for a PTFE/ carbon gasket that makes the valve gas-tight and serves as an external guide for the valve´s knife-edge sliding gate. The combination of stainless steel on Teflon/carbon allows precision movement of the plate without vibrations or jamming.
Depending on local pipe run, there are two different types of measuring and control pipe section available:
Compact System:
The VACOMASS® air flow meter can be installed only 500 mm in front of the VACOMASS® square diaphragm control valve. Using simultaneous flow profile correction, flow can be measured very precisely. Even If necessary, piping related influences disturbances of the flow profile can be examined and compensated during calibration in Binder´s CAMASS® Calibration -Lab.
Separated system:
If there is sufficient straight pipe run available (depending on the number and kind type of pipe fittings as well asand the geometry of the pipe run/ pipe reduction, a minimum distance of 10*D upstream to the installation place of the VACOMASS® flow meter), the flow meter will can be installed min.at least 5*D in front of the VACOMASS® square diaphragm control valve. Standard calibration can be applied, flow profile correction is not necessary. The total length of the measurementing and control section becomes is much longer compared to compact system and in most cases of refurbishments not available.
