German TAOFLO pump TAOFLO model TAOFLO price

TAOFLO pumps are an important component in hydraulic systems. They rely on the reciprocating motion of plungers within a cylinder block to change the volume of sealed working chambers, thereby achieving oil suction and discharge. Plunger pumps offer advantages such as high rated pressure, compact structure, high efficiency, and convenient flow regulation. Plunger pumps are widely used in applications requiring high pressure, large flow rates, and flow adjustment, such as hydraulic presses, construction machinery, and ships.

TAOFLO pump classification

Plunger pumps are generally classified into single-plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single-plunger pump: The main structural components include an eccentric wheel, plunger, spring, cylinder block, and two check valves. A sealed volume is formed between the plunger and the cylinder bore. One rotation of the eccentric wheel causes the plunger to reciprocate once; downward motion sucks oil, and upward motion discharges oil. The volume of oil discharged per revolution of the pump is called displacement, which depends only on the pump's structural parameters. 2) Horizontal plunger pump: Horizontal plunger pumps consist of several plungers (generally 3 or 6) installed in parallel. A 1 crankshaft drives the plungers in reciprocating motion via connecting rod sliders or directly via an eccentric shaft, achieving liquid suction and discharge. They also use valve-type distribution devices and are mostly fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. Their operating principle relies on the rotation of the crankshaft to drive pistons in reciprocating motion, achieving liquid suction and discharge. 3) Axial type: Axial plunger pumps (English name: Piston pump) are plunger pumps where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder block. Axial plunger pumps operate by utilizing the volume change generated by the reciprocating motion of plungers parallel to the drive shaft within plunger bores. Since both the plunger and plunger bore are circular parts, they can achieve high-precision mating, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks. For hydraulic tanks relying on air pressure for supply, the machine must only be operated after the hydraulic tank reaches the required operating pressure. Starting the machine when the hydraulic tank pressure is insufficient can cause detachment of the slipper shoes within the hydraulic pump, leading to abnormal wear between the return plate and the pressure plate inside the pump body. 5) Radial type: Radial plunger pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial plunger pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial plunger pumps developed in the 70s and 80s internationally have overcome the shortcomings of valve-distribution radial plunger pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial plunger pumps are more impact-resistant, have longer service lives, and offer higher control precision than axial plunger pumps. For pumps with short variable strokes, displacement variation is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger. The maximum eccentricity of the stator is 5–9mm (depending on displacement size), resulting in a very short variable stroke. Furthermore, the variable mechanism is designed for high-pressure operation and controlled by a control valve, resulting in fast pump response. The radial design overcomes issues such as uneven slipper shoe wear found in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized hydraulic tanks. After each machine start-up, operation must only begin once the hydraulic tank reaches the required operating pressure. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks, though some hydraulic pumps have built-in boost pumps to supply pressure oil to the inlet. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

TAOFLO pump operating principle

The motor drives the worm gear via a coupling, and the worm wheel reduces speed to rotate the main shaft and eccentric wheel. The eccentric wheel drives the tappet in reciprocating motion within the guide tube. Together with the diaphragm, the action of the check valves gradually forms 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, the discharge valve opens, and the liquid is discharged under the push of the diaphragm. The pump performs continuous, pressurized, metered liquid discharge through reciprocating motion with adjustable stroke. Pump flow regulation is achieved by rotating the adjustment handwheel, which turns the adjustment screw, thereby changing the distance between tappets and altering the diaphragm's travel stroke within the pump chamber to determine flow rate. The scale on the adjustment handwheel determines the diaphragm stroke, with an accuracy of 95%.

TAOFLO 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 corrosivity. 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 back-pressure valve at the end of the pipeline. 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 height calculated? Divide the metering pump's rated suction lift height 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 metering pump's rated working pressure range and must not exceed the metering pump's maximum working pressure. The safety valve is designed to prevent overpressure operation of the metering pump. For example, if the metering pump's maximum working pressure 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 select the appropriate pulse dampener volume? 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 pulsation by 90%. 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 field applications require large storage tanks and reliance on the metering pump's self-priming capability is not feasible. 8) Can you provide some recommendations regarding metering pump head selection? What problems typically arise concerning chemical corrosion of pump heads/seals, and how can they be avoided? Typical issues with metering pump heads 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 seals with PTFE pump heads or stainless steel pump heads should be selected. For metering concentrated hydrochloric acid, Viton seals with plexiglass pump heads are usually chosen. For metering concentrated sulfuric acid, PTFE seals with 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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