German Williamson pump Williamson model Williamson price

Williamson pumps are also known as positive displacement devices, functioning like a piston within a cylinder. When one gear tooth enters the fluid space of another, the incompressibility of the liquid prevents the liquid and the tooth from occupying the same space simultaneously, mechanically displacing the liquid. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume is identical for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed.

Williamson pump structural features

1) Simple structure and low cost; 2) Low operational requirements and wide application; 3) The end covers and the spaces between the gear teeth form many fixed sealed working chambers, so it can only be used as a fixed-displacement pump. The gears adopt the double-arc sine curve tooth profile, an advanced technology from the international nineties. Compared with involute gears, its most prominent advantage is that there is no relative sliding on the tooth profile surface during the gear meshing process, resulting in no tooth surface wear, smooth operation, no fluid trapping, low noise, long service life, and high efficiency. This pump breaks free from the constraints of traditional design, bringing gear pump design, production, and use into a new field. The pump is equipped with a differential pressure safety valve for overload protection. The full return pressure of the safety valve is 1.5 times the rated discharge pressure of the pump. It can also be adjusted according to actual needs within the allowable discharge pressure range. However, this safety valve cannot be used as a pressure reducing valve for long-term operation; a pressure reducing valve can be installed separately if needed. The shaft end seal of the pump is designed in two forms: mechanical seal and packing seal, which can be determined based on specific usage conditions and user requirements.

Williamson pump classification

Piston pumps are generally divided into single-piston pumps, horizontal piston pumps, axial piston pumps, and radial piston pumps. 1) Single-piston pump: The main structural components are an eccentric wheel, plunger, spring, cylinder body, 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, drawing in oil during downward motion and discharging oil during upward motion. The volume of oil discharged per revolution of the pump is called the displacement, which depends only on the pump's structural parameters. 2) Horizontal piston pump: Horizontal piston pumps consist of several pistons (generally 3 or 6) installed in parallel. A 1 crankshaft drives the pistons to reciprocate via connecting rod sliders or directly through an eccentric shaft, achieving suction and discharge of liquid in a hydraulic pump. They all use valve-type distribution devices and are mostly fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal piston pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. Their working principle relies on the rotation of the crankshaft to drive the Piston to reciprocate, achieving liquid suction and discharge. 3) Axial type: Axial Piston pump (English name: Piston pump) are piston pumps where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder body. Axial piston pumps operate by utilizing the volume change generated by the reciprocating motion of pistons parallel to the drive shaft within the piston bores. Since both the pistons and piston bores are circular parts, they can achieve high-precision fit, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate piston pumps are divided into pressure-supplied and self-priming types. Pressure-supplied 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 following each startup. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause the slipper shoes inside the hydraulic pump to detach, leading to abnormal wear between the return plate and the pressure plate in the pump body. 5) Radial type: Radial piston pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial piston pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial piston pumps developed internationally in the 70s and 80s overcame the shortcomings of valve-distribution radial piston pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial piston pumps are more impact-resistant, have longer service lives, and offer higher control precision than axial piston 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 the displacement size), and the variable stroke is very short. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve, resulting in fast response speed. The radial structural design overcomes problems such as uneven wear of slipper shoes in axial piston pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic piston pumps rely on pressurized tanks for oil supply. After each startup, the machine must only be operated after the hydraulic tank reaches the required operating pressure. Straight-axis swashplate piston pumps are divided into pressure-supplied and self-priming types. Pressure-supplied hydraulic pumps mostly use pressurized tanks, while some hydraulic pumps have a booster pump that supplies pressure oil to the inlet of the hydraulic pump. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

Williamson pump maintenance

(1) Inspect the plunger for scratches and corrosion; replace with a new part if necessary. (2) Check the fit of the plunger assembly. Insert the plunger tip into the plunger barrel and tilt it by approximately 60°; if the plunger slides down slowly under its own weight, the fit is good. (3) Check the sealing of the plunger assembly. Hold the plunger barrel with one hand, and use two fingers to block the oil inlet at the top and side of the plunger. Pull out the plunger with the other hand; if significant suction is felt and the plunger immediately retracts to its original position upon release, the plunger assembly sealing is good; otherwise, replace the plunger assembly. (4) Inspect the decompression band of the delivery valve assembly for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve assembly. Block the lower hole of the delivery valve with one finger, and gently press the delivery valve downward with another finger. When the finger is removed from the top of the delivery valve, if it automatically springs back to its original position, the delivery valve assembly sealing is good; otherwise, replace the delivery valve assembly. (6) Inspect the tappet body. The standard clearance between the fuel injection pump body and the tappet body is 0 to 0.03mm; if it exceeds 0.2mm, replace the parts. (7) Check the clearance between the plunger flange and the groove of the control sleeve, which should be 0.02 to 0.08mm; if it exceeds 0.12mm, the control sleeve must be replaced.

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