Gestra BAE46 Blowdown Valve Flanged DN15 PN40 C/W 115V Actuator
Gestra BAE46 continuous blowdown valves with electric actuator are used for removing boiler blowdown from steam generating units.

The equipment may only be used within the admissible pressure and temperature limits, with due consideration of chemical and corrosive influences. The equipment comes with a sampling valve as standard.

• BAE 46 is operated by the Electric Actuator EF10

Due to the continuous evaporation process in the steam boiler the density and hence the TDS (= Total Dissolved Solids) concentration of the boiler water is increased. The TDS level must remain within the limits specified by the boiler manufacturer and applicable guidelines. For this purpose a certain amount of boiler water (= boiler blowdown) is discharged continuously or periodically.

The continuous blowdown valve BAE 46 feature specially designed and wear resistant nozzle stems that enter concentrically into a system of expansion chambers which are arranged one after the other, making the valve well suited for the continuous discharge of boiler blowdown at very high differential pressures. The continuous blowdown valve BAE 46 is suitable for operation in steam boiler plants according to TRD 604, EN 12952 and EN 12953.

The continuous blowdown valve BAE 46 is motored to its control position by means of the actuator EF 10 The actuator is activated by the Gestra conductivity controller KS 90 working in conjunction with the Gestra conductivity electrode LRGT 1... or the conductivity controller LRR 1-5x in combination with the Gestra conductivity electrode LRG/T 1... or the conductivity controller LRR 1-40 in conjunction with the conductivity electrode LRG 16...-40.

The actuator opens or closes the continuous blowdown valve as a function of the required amount of boiler blowdown and the desired operating position, at which - independent of the actual electrical conductivity of the boiler water - a freely selectable basic amount can be discharged by the BAE 46. The valve positions OPEN and CLOSED are limited by the cam-operated switch located in the actuator, the operating position is variably adjustable by means of an operating cam or a feedback potentiometer. The power flow towards the closing direction is transmitted via a coupling with integrated torsion spring. The coupling permits the actuator to travel a little bit further when the nozzle stem is pressed into the valve seat.

The conductivity of the boiler water is monitored by the equipment combination consisting of a conductivity electrode and a conductivity controller. The continuous evaporation process in the steam boiler increases the boiler water density and, consequently, the TDS level, causing the conductivity of the boiler water to rise. Once the set limit is reached, the actuator receives an opening signal from the conductivity controller as a function of the deviation from the conductivity setpoint. When the adjusted conductivity setpoint is attained, the actuator closes the continuous blowdown valve or returns to the adjusted operating position. The valve positions CLOSED and OPEN are limited by the cam-operated switch located in the actuator, the operating position is variably adjustable by means of an operating cam or a feedback potentiometer