Elliptic diaphragm control valve

VACOMASS® elliptic diaphragm control valve

Diaphragm control valve with elliptical control aperture and falling flow axis
Optimized for high airflow volumes at low pressure loss
Low operating noise due to integrated pressure wave breaker (patent pending)
0-100% control span, bubble-tight in closed position
Electric actuator for sensitive aeration control is standard feature
Valve optimized for minute control steps of less than 0.2% of flow

VACOMASS® elliptic diaphragm control valve

The VACOMASS® elliptic diaphragm control valve is a technically optimized diaphragm control valve with an elliptical aperture for precise, lowpressureloss control and distribution of aeration air in wastewater treatment plants. It closes bubble-tight. For sensitive control of axial and tangential flows (e.g. after elbows) the flow axis moves downward and is designed for compliance with DIN EN 60534-2-3.

The diaphragm control valve has a stable, apertureproportional control curve in the usual control range and can be positioned from 0-100% open. Differential pressure loss, as measured according to ATV guidelines, less than 10 mbar (0.145 psi) at specified flow and 100% open.

The diaphragm control valve body consists of two identical halves that are designed for use as a wafer valve or end-of-pipe. A groove between the body halves holds the seal. The prismatic PTFE/carbon seal seals the diaphragm and simultaneously acts as a guide for the diaphragm. The pairing of the stainless diaphragm plate with the PTFE/carbon seal provides a vibration-free guide and prevents jamming.

Important features include:

Bubble-tight shut-off for applications such as swing zones and process optimization – saves a separate automatic isolation valve and associated costs
Sizing based on customer airflow rates; specification of the valve size is targeted towards optimal performance at average flow rates.
At 100% the entire pipe cross section is open, reducing pressure losses
Due to the shape of the control diaphragm, the control range for airflows is much greater than comparable triangular, square, pentagonal or hexagonal diaphragms
Designed with falling flow axis to direct flow towards the wall. This supports pressure recovery for a relatively low pressure loss – saves energy costs
Pipes must be reduced/expanded for measurement and control to achieve optimal performance.
The diaphragm control valve is designed and built with a stainless steel diaphragm plate and seals made of Teflon/carbon/Viton for environmental and media temperatures up to 1500C (3000F), selflubricating spindle for dry operation, and hermetic sealing of the spindle against moisture and dust – reduces operations and maintenance costs
Comes with a VACOMASS electric actuator for sensitive control of air from -400C to +600C (-400F to 1400F) (optionally up to +800C/+1750F), flanged directly to the valve; besides AUMA and Rotork other manufacturers are available as long as they meet technical specifications
Can be combined with a VACOMASS flow meter for aeration control
Despite space needed for pipe reduction/expansion, special calibration of the flow meter for compact installation provides a relatively short measurement and control section – ideal for upgrading existing installations.