German RIDGID pump RIDGID model RIDGID price

RIDGID 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.

RIDGID 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 draws in 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 have several plungers (typically 3 or 6) installed in parallel. A 1 crankshaft drives the plungers in reciprocating motion via connecting rod sliders or directly through an eccentric shaft, achieving hydraulic pumping for 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 supply emulsion to hydraulic supports; their operating principle relies on crankshaft rotation driving pistons in reciprocating motion to achieve fluid 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 volume changes 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 following each startup. Starting the machine when hydraulic tank air pressure is insufficient can cause detachment of slipper shoes inside the hydraulic pump, leading to abnormal wear between the return plate and pressure plate within the pump body. 5) Radial type: Radial plunger pumps can be categorized into valve distribution and shaft distribution types. Valve-distribution radial plunger pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial plunger pumps developed internationally in the 70s and 80s overcame 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 life, and offer higher control precision compared to axial plunger pumps. For pumps with short variable strokes, displacement variation is achieved by changing the stator's eccentricity under the action of variable plungers and limit plungers; the maximum stator eccentricity 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 control valves, giving the pump fast response speed. 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 startup, operation must wait until 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, while some hydraulic pumps have built-in boost pumps supplying pressure oil to the inlet. Self-priming hydraulic pumps have strong self-priming capability and do not require external oil supply.

RIDGID pump operating mode

During operation, the cam on the injection pump camshaft and the plunger spring force the plunger to reciprocate up and down, thereby completing the pumping task. The pumping process can be divided into the following three stages. Conclusion: From the above discussion, the following conclusions are drawn: (1) The total reciprocating stroke L of the plunger is constant and determined by the cam lift. (2) The fuel supply quantity per plunger cycle depends on the supply stroke; the supply stroke is not controlled by the camshaft and is variable. (3) The start timing of fuel supply does not change with variations in the supply stroke. (4) Rotating the plunger changes the end timing of fuel supply, thereby altering the fuel supply quantity. 3. Domestic series plunger injection pumps: Domestic series plunger pumps mainly include A, B, P, Z, and Series I, II, III, etc. Standardization is based on different fuel supply requirements according to the single-cylinder power range of diesel engines, using plunger stroke, pump cylinder center distance, and structural type as the basis, combined with plunger diameters of different sizes to form several injection pumps with varying fuel supply quantities per working cycle, meeting the needs of various diesel engines. The working principles and structural types of domestic series injection pumps are basically the same; taking the A type pump as an example, the construction and working principle of plunger injection pumps are introduced. The plunger pump consists of four main parts: pumping elements, fuel quantity adjustment mechanism, drive mechanism, and pump body. It features microprocessor intelligent control, LCD display, and communication with computers, offering stable working pressure, low pulsation, and easy operation. It is widely used in biochemistry, pharmaceutical, chemical, environmental protection, and other industries, meeting the requirements for continuous constant-pressure and constant-flow liquid delivery in these sectors.

RIDGID pump mechanical maintenance

For plunger pumps using boost pumps for oil supply, after 3000h of use, operators must inspect the plunger pump 1-2 time(s) daily to check if the hydraulic pump operating noise is normal. If a decrease in hydraulic cylinder speed or stalling is observed, the boost pump should be disassembled for inspection to check for scoring on the impeller edges and whether the internal gear pump clearance is excessive. For self-priming plunger pumps, the oil level in the hydraulic tank must not fall below the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. Higher hydraulic oil cleanliness extends hydraulic pump service life. The most critical component of a plunger pump is the bearing. If bearing clearance occurs, it cannot guarantee the normal clearance of the three friction pairs inside the hydraulic pump and will also disrupt the static hydrostatic support oil film thickness of each friction pair, reducing the service life of the plunger pump bearings. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h; exceeding this value requires replacement with new ones. Removed bearings cannot be tested for clearance without professional detection instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surfaces, they must be replaced. When replacing bearings, note the original bearing's English letters and model number. Plunger pump bearings mostly use high-load capacity bearings; purchase original manufacturer, original specification products. If switching to another brand, consult experienced personnel to cross-reference tables, aiming to maintain the bearing's precision grade and load capacity. The service life of a plunger pump depends on routine maintenance, hydraulic oil quantity and quality, and oil cleanliness. Avoiding wear on plunger pump friction pairs caused by particles in the oil is also an effective way to extend plunger pump life. During maintenance, use original manufacturer parts whenever possible. These parts may sometimes be more expensive than counterfeit alternatives, but their quality and stability are superior. Purchasing cheap counterfeit parts may seem cost-effective in the short term but introduces hidden dangers and may cause greater harm to the plunger pump. Distribution plates come in flat and spherical distribution forms. For spherical distribution friction pairs, shallow scratches on the cylinder block distribution surface can be repaired by grinding; if grooves are deep, surface engineering techniques should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent thinning of the copper layer or exposing the steel base, which could lead to oil leakage. Plunger pumps can also use variable frequency drives (VFDs) to save energy. Engineers from Shanghai Zhengyi point out that in actual production processes, plunger pumps usually regulate their operating status by pressure or flow. When actual pressure exceeds required pressure, relief valves are used to regulate, maintaining stable working pressure by releasing excess pressure. However, the motor continues to run at full speed with repeated actions and unchanged power consumption. When using overflow to regulate pressure and flow, some surplus flows back to the original system, resulting in useless power in the plunger pump and low work efficiency. If using Chuangjie energy-saving VFDs, the relief valve can be set to close, and the VFD automatically adjusts working pressure, maintains stable working pressure, and automatically tracks equipment pressure. This achieves automated control, thereby saving energy. The greatest advantage of this regulation method is reducing the operating energy consumption of plunger pumps, with power savings reaching over 30%.

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