German PRATISSOLI pump PRATISSOLI model PRATISSOLI price

PRATISSOLI pumps are an important component in hydraulic systems. They rely on the reciprocating motion of plungers within the cylinder block to change the volume of the sealed working chamber, 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.

PRATISSOLI pump structural types

Plunger pumps are divided into two representative structural forms: axial plunger pumps and radial plunger pumps. Since radial plunger pumps are a new type of high-efficiency pump with high technical content, with the acceleration of localization, radial plunger pumps will inevitably become an important part of the plunger pump application field. A radial plunger pump is a plunger pump where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Radial plunger pump working principle: Drive torque is transmitted from the drive shaft via a cross coupling to the star-shaped hydraulic cylinder rotor; the stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plungers located in the rotor press tightly against the eccentric stroke stator through hydrostatically balanced slippers. The plunger is connected to the slipper via a ball joint and locked with a retaining ring. Two retaining rings hold the slippers against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor turns, due to the eccentricity of the stator, the plunger performs reciprocating motion, with its stroke being 2 times the stator eccentricity. The stator's eccentricity can be adjusted by two plungers positioned radially opposite each other on the pump body. Oil inlet and outlet occur through channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. The hydraulic pressure generated within the pump body is absorbed by the hydrostatically balanced surfaces. The hydrostatic balance of the friction pairs adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft serve only a supporting role and are not subjected to other external forces. In hydraulic systems: Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the transmission shaft within the plunger holes. Since the plungers and plunger holes of plunger pumps are circular components, they can achieve very high precision fits during machining.

PRATISSOLI pump usage instructions

For plunger pump cylinder blocks fitted with copper sleeves, installation can be performed by replacing the copper sleeves. First, trim the outer diameter of a set of plunger rods to a uniform size, then polish the outer diameter with sandpaper of 1000# grit or higher. Three methods for installing copper sleeves in the cylinder block: a) Heating the cylinder block for hot fitting or cryogenic shrink-fitting of the copper sleeve for interference fit; b) Adhesive assembly using Loctite, which requires grooves on the outer diameter surface of the copper sleeve; c) Tapping the cylinder bore, machining threads on the outer diameter of the copper sleeve, applying Loctite, and screwing it in for assembly. Installation methods for cylinder blocks and copper sleeves joined by sintering are as follows: a) Use a lapping bar to manually or mechanically lap and repair the cylinder bore; b) Use a coordinate boring machine to re-bore the cylinder block hole; c) Use a reamer to repair the cylinder block hole. Methods using "surface engineering technology" are as follows: a) Electroplating technology: Plate a layer of hard chrome on the plunger surface; b) Brush plating technology: Brush plate wear-resistant material onto the plunger surface; c) Thermal spraying, arc spraying, or electric spraying: Spray high-carbon martensitic wear-resistant material; d) Laser cladding: Clad high-hardness wear-resistant alloy powder onto the plunger surface. e) For cylinder blocks without copper sleeves, the cylinder material is mostly nodular cast iron, with an amorphous film or coating prepared on the inner wall of the cylinder. Because of this special material on the inner wall of the cylinder bore, a hard-to-hard friction pair can be formed.

PRATISSOLI pump mechanical maintenance

For plunger pumps supplied with oil by a charge pump, after 3000h of use, operators must inspect the plunger pump 1-2 times daily to check if the hydraulic pump operating noise is normal. If a decrease in hydraulic cylinder speed or stalling is observed, the charge 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. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump. The most important component of a plunger pump is the bearing. If bearing play occurs, the normal clearance of the three internal friction pairs of the hydraulic pump cannot be guaranteed, and the thickness of the hydrostatic support oil film of each friction pair will be compromised, 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; beyond this value, new bearings must be replaced. Removed bearings cannot be tested for play without professional detection instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surface, 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 products from the original manufacturer with original specifications. If switching to another brand, consult personnel experienced with bearings to check tables for equivalents, aiming to maintain the bearing's precision grade and load capacity. The service life of a plunger pump depends on routine maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear on the plunger pump friction pairs caused by particles in the oil is also an effective way to extend plunger pump life. During maintenance, try to use original manufacturer parts when replacing components. These parts may sometimes be more expensive than counterfeit alternatives, but their quality and stability are better. Purchasing cheap counterfeit parts may seem to save costs in the short term, but it introduces hidden dangers and may cause greater harm to the plunger pump's operation. Distribution plates come in two forms: flat distribution and spherical distribution. For spherical distribution friction pairs, if scratches on the cylinder block distribution surface are shallow, they can be repaired by lapping; if grooves on the cylinder block distribution surface are deep, "surface engineering technology" should first be used to fill the grooves before lapping. Blind lapping should be avoided to prevent thinning of the copper layer or exposing the steel base, which could cause 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 the actual pressure exceeds the required pressure, a relief valve is used for regulation to maintain stable working pressure by releasing the excess. However, the motor continues to run at full speed with repeated actions, and power consumption remains unchanged. 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 a Chuangjie energy-saving VFD is used, the relief valve can be set to close, and the VFD automatically adjusts the working pressure to maintain stability and automatically track the equipment pressure. This achieves automated control, thereby saving energy. The greatest advantage of this regulation method is the reduction of plunger pump operating energy consumption, with power savings reaching 30% or more.

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