German PRICE PUMP pump PRICE PUMP model PRICE PUMP price

PRICE PUMP pump is a mechanical device that can meter the delivered liquid. It is often used in various types of chemical dosing skids, so it is also called a dosing pump. It is a special positive displacement pump used to transport liquids (especially corrosive liquids), which can meet the needs of various strict process flows, and the flow rate can be steplessly adjusted within the range of 0-100%.

PRICE PUMP pump structure and classification

The pump consists of three parts: motor, transmission box, and cylinder body. The transmission box components consist of a cam mechanism, stroke adjustment mechanism, and ratio worm gear mechanism; the plunger stroke is adjusted by rotating the adjustment handwheel, thereby changing the diaphragm extension distance to achieve the purpose of changing the flow rate. The cylinder body components consist of the pump head, suction valve group, discharge valve group, diaphragm base, etc. Dosing metering pumps can be divided into motor-driven and solenoid-driven types according to the drive. For flow adjustment of motor-driven metering pumps, a frequency converter can be used to change the motor speed, or the piston stroke can be changed to adjust the flow. Install a servo motor (ATE), rotate left and right to adjust the angle, making the piston stroke larger or smaller. Electromagnetic flow adjustment changes the reciprocating frequency of the diaphragm. It can accept the pulse frequency from a flow meter or an analog signal of 4～20mA, and can also accept the analog 4～20mA signal from water quality instruments, with the controller adjusting the dosing. The flow rate can be adjusted manually using buttons, or the dosing amount can be controlled by a controller (PID).

PRICE PUMP pump working principle

The motor drives the worm shaft via a coupling, and the worm gear reduces the speed to make the main shaft and eccentric wheel perform rotary motion. The eccentric wheel drives the plunger to perform reciprocating motion within the guide tube. Together with the diaphragm, the action of the check valve gradually forms a vacuum in the pump chamber, opening the suction valve and sucking in the liquid; when the diaphragm moves to the forward dead center, the suction valve closes, the discharge valve opens, and the liquid is discharged under the push of the diaphragm. The pump performs continuous reciprocating work with a certain stroke to form a continuous, pressurized, and quantitative discharge of liquid. The pump's flow adjustment relies on rotating the adjustment handwheel, which drives the adjustment screw to rotate, thereby changing the distance between the plungers and determining the flow rate by changing the diaphragm's movement stroke within the pump chamber. The scale of the adjustment handwheel determines the diaphragm stroke, with an accuracy of 95%.

PRICE PUMP pump precautions

1) What important matters should be noted when operating the 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 the pump's repeatable metering accuracy? Installing a valve spring on the metering pump discharge valve can improve repeatable metering accuracy, but the most effective improvement method is to install a backpressure valve at the end of the pipeline. 3) How to adjust the backpressure 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 the suction lift height calculated? Divide the rated suction lift height 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 of the metering pump. 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 of the metering pump. Overpressure operation is one of the main causes of metering pump damage. 6) How to calculate the appropriate volume for a pulse dampener? Multiply the metering capacity per stroke of the metering pump (ml) by 26 to obtain the minimum volume of the pulse dampener (ml) required to reduce 90% pulsation. 7) Under what circumstances is flooded suction used? When the metered liquid is volatile; when the specific gravity of the metered liquid is high; when a higher stroke frequency is required; when the metering pump operates at high altitudes; and when field applications require large storage tanks and self-priming by the metering pump is not feasible. 8) Can you provide some suggestions on metering pump head selection? What problems usually arise regarding chemical corrosion of the pump head/seals, and how can they be avoided? Problems with metering pump heads usually occur when metering acids, chlorine, fluorides, and hydrogen peroxide. Due to different chemical concentrations and operating temperatures, it is difficult to determine the specific pump head material. When metering fluorides, we recommend choosing a Viton sealed PVC pump head. For most chlorination applications, it is best to choose an EPDM sealed NP (plexiglass) pump head. For metering hydrogen peroxide mixtures, only a PTFE sealed PTFE pump head or stainless steel pump head can be selected. For metering concentrated hydrochloric acid, a Viton sealed plexiglass pump head is usually selected. For metering concentrated sulfuric acid, a PTFE sealed PTFE pump head can be selected. Chemical manufacturers will provide relevant recommendations, or consult the ProMinent chemical resistance chart to determine the compatibility of chemicals with contact materials. 9) What influencing factors must be considered when metering liquids with the pump head? The main factors to consider are the viscosity, specific gravity, vapor pressure, and temperature of the liquid.

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