The VACOMASS® elliptic diaphragm control valve is a technically optimized control valve, especially developed for aeration air, closing gas-tight with a lenticular control aperture. Low pressure drop in the whole control range and high flow rate capacity for flexing and cleaning the diffuser with very low pressure drop are two of the main features (design according to DIN EN 60534-2-3).
The VACOMASS® elliptic diaphragm control valve is a technically optimized sliding gate control valve with gas-tight shut-off and a lenticular/ elliptical control aperture. It is used for precise and low-loss control of air flow 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.
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. A wave breaker in the outlet area of the valve body (patent pending) prevents high-pitched noise generation.
Within the usual control range the valve has a stable control curve, 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 design stroke in control mode typically ranges between 30 – 70%, pressure drop will range between 8-15 mbar (technically required for a stable control and distribution of aeration air at stable and optimum boundary conditions – same pressure conditions related to water depth, aerators etc.).
Air flow rate can be increased significantly and easily for cleaning of aerators (air bumping, flexing) and/or pulse aeration in nitrification zones without mixer during non-aerated process phases by increasing the stroke up to 100% without increase of header pressure. This control valve complies with the requirements of the new standard paper of German Water and Wastewater Association M 229-1, published in September 2017 regarding pressure drop and related energy efficiency.
Depending on local pipe situation, there are two different types of measuring and control pipe section possible:
Compact System: The VACOMASS® air flow meter can be installed 500 mm in front of the VACOMASS® elliptic diaphragm control valve. Simultaneous flow profile correction for very precise flow measurement is applied based on actual stroke of the valve. If necessary, piping related 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 (depending on the type of pipe fittings and the geometry of the pipe run, a minimum distance of 10*D upstream of the VACOMASS® flow meter), the flow meter can be installed at least 5*D in front of the VACOMASS® elliptic diaphragm control valve. Standard calibration can be applied, flow profile correction is not necessary. The total length of the measurement and control section is much longer and in most cases not available.
VACOMASS® flow meter
The VACOMASS® air flow meters use thermal mass flow principle and measure the gas mass flow respectively standard volume flow directly, independent of pressure and temperature of the medium at standard conditions according to DIN 1343.
The special feature of VACOMASS® flexcontrol is the complete flexibility and intuitive operation of the open system, which allows easy adjustment to the plant requirements - not a "black box" that spreads uncertainty, but modular with standardized building blocks and based on control algorithms that have been successfully used worldwide for many years, simple and clear for every control loop.
Service & Support
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Binder Engineering GmbH
Tel +49 731 96826-0