German schmalenberger pump schmalenberger model schmalenberger price

schmalenberger pumps are mechanical devices that meter the delivered liquid and are often used in various chemical dosing skids, hence they are also called dosing pumps. They are a special type of positive displacement pump designed to meet stringent process requirements, with flow infinitely adjustable within the 0-100% range for transporting liquids (especially corrosive liquids).

schmalenberger pump structure and classification

The pump consists of three main parts: motor, gearbox, and cylinder block. The gearbox components include a cam mechanism, stroke adjustment mechanism, and ratio worm gear; rotating the adjustment handwheel adjusts the tappet stroke, thereby changing the diaphragm extension distance to achieve flow adjustment. The cylinder block components include the pump head, suction valve assembly, discharge valve assembly, and diaphragm base. Dosing metering pumps can be classified by drive type into motor-driven and solenoid-driven. For motor-driven metering pumps, flow adjustment can be achieved by using a VFD to change the motor speed or by adjusting the piston stroke. Installing a servo motor (ATE) allows left/right rotation to adjust the angle, increasing or decreasing the piston stroke. Solenoid-driven flow adjustment changes the reciprocating frequency of the diaphragm; it can accept pulse frequency from a flow meter or an analog signal of 4～20mA, as well as analog 4～20mA signals from water quality instruments, with the controller regulating dosing. Flow can be adjusted manually via buttons or controlled by a controller (PID) for dosing quantity.

schmalenberger pump working principle

The motor drives the worm shaft via a coupling, and the worm gear reduces speed to rotate the main shaft and eccentric wheel. The eccentric wheel drives the tappet to reciprocate within the guide tube. Together with the diaphragm, the action of the check valves gradually creates a vacuum in the pump chamber, opening the suction valve to draw in liquid; when the diaphragm moves to the forward dead center, the suction valve closes and the discharge valve opens, expelling the liquid under the diaphragm's push. The pump forms a continuous, pressurized, quantitative discharge by reciprocating at a set stroke. Pump flow adjustment is achieved by rotating the adjustment handwheel, which turns the adjustment screw, changing the spacing between tappets and thus the diaphragm stroke within the pump chamber to determine flow size. The handwheel scale determines the diaphragm stroke, with an accuracy of 95%.

schmalenberger pump precautions

1) What important matters should be noted when operating a dosing system? Injection point pressure, stroke frequency, suction lift height, altitude, and chemical corrosiveness. 2) When the metering pump outlet is at atmospheric pressure, what methods can improve repetitive metering accuracy? Installing a valve spring on the metering pump discharge valve can improve repetitive metering accuracy, but the most effective improvement is installing a back-pressure valve at the end of the line. 3) How to adjust the back-pressure valve? When there is pressure at the suction end of the metering pump, the pressure at the discharge end must be at least 1bar higher than the suction end pressure. Never exceed the maximum working pressure of the metering pump. 4) If the transported liquid is not water, how is suction lift calculated? Divide the rated suction lift of the metering pump by the specific gravity of the metered liquid. 5) How to set the safety valve pressure? The safety valve pressure can be adjusted within the rated working pressure range of the metering pump and must not exceed the maximum working pressure. The safety valve is designed to prevent overpressure operation of the metering pump. For example, if the maximum working pressure of the metering pump is 3bar, the safety valve pressure should be set to 3bar or lower to ensure normal operation. Overpressure operation is one of the main causes of metering pump damage. 6) How to select the appropriate pulse dampener volume? Multiply the metering capacity per stroke of the metering pump (ml) by 26 to obtain the minimum volume (ml) of the pulse dampener required to reduce 90% pulsation. 7) Under what circumstances is flooded suction used? When the metered liquid is volatile; when the metered liquid has a high specific gravity; when high stroke frequencies are required; when the metering pump operates at high altitudes; or when large storage tanks are required on-site and self-priming by the metering pump is not feasible. 8) Can you provide some recommendations regarding metering pump head selection? What issues typically arise concerning chemical corrosion of the pump head/seals, and how can they be avoided? Issues with metering pump heads usually occur when metering acids, chlorine, fluorides, and hydrogen peroxide. Due to varying chemical concentrations and operating temperatures, it is difficult to determine the specific pump head material. For metering fluorides, we recommend selecting Viton seals with PVC pump heads. For most chlorination applications, it is best to choose EPDM seals with NP (plexiglass) pump heads. For metering hydrogen peroxide mixtures, only PTFE sealed PTFE pump heads or stainless steel pump heads should be selected. For metering concentrated hydrochloric acid, Viton sealed plexiglass pump heads are usually chosen. For metering concentrated sulfuric acid, PTFE sealed PTFE pump heads can be selected. Chemical manufacturers will provide relevant recommendations, or consult ProMinent chemical resistance charts to determine compatibility between chemicals and contact materials. 9) What influencing factors must be considered when metering liquids with the pump head? The main factors to consider are liquid viscosity, specific gravity, vapor pressure, and temperature.

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