In some regulation processes, it is necessary a linear opening valve (related to the passing area). To the butterfly valves, which are normally used for modulated regulating processes, can be indicated the required opening degree, but the passing area through the valve is not linear and the biggest throttler is only caused in the last closing degrees. For the same fact that in butterfly valves the biggest throttler is caused in the last closing degrees, it is produced a cavitation that creates serious damages to the valve.
The surface passing control process is achieved through the longitudinal movement of the obturator that has on its final fraction a teflon or elastomeric ring. This ring is the one that gives the final sealing into the integral seat to the closing flange.
Both the seat and the obturator have the nominal diameter of the valve.
For the high cavitation cases it is used a model called drilled cilinder, in the exit it is placed a high hardness stainless steel cilinder designed to manage the cavitation.
Our anular type valve is a control equipment prepared to work through an electric actuator managed by PLC or manual operation.
• Both the teflon ring and the hardened seat are easily replaceable.
• The anular valve allows an optimum precision level of the system because it has a modification on the passing surface that is proportional to the obturator movement.
• The AUMA mechanism box of the valve is standard in the industry, it is easily motorized.