The Danfoss PAH50-100 stands as a formidable solution in the realm of industrial hydraulics,specifically engineered as a high-pressure oil pump capable of meeting the rigorous demands of heavy-duty applications.This model represents a pinnacle of high-pressure pump technology,designed to deliver reliable performance in open circuit systems where consistent fluid power under extreme pressure is non-negotiable.Built with a focus on durability and efficiency,the PAH50-100 is ideally suited for powerful machinery operating in sectors like metal processing,construction,and injection molding.Its robust construction and advanced pressure-compensating control mechanism allow it to automatically adjust output flow based on system demands,optimizing energy consumption while maintaining operational integrity under loads up to 350 bar.This pump exemplifies Danfoss's commitment to providing components that enhance both the performance and longevity of hydraulic systems.

　　1.Product Overview and Operational Principle

　　The Danfoss PAH50-100 is a variable displacement axial piston pump that operates on the swashplate principle.Its core functionality revolves around a rotating cylinder block containing several pistons,which are connected to a swashplate.As the drive shaft turns the cylinder block,the angle of the swashplate causes the pistons to undergo a reciprocating motion.This movement draws hydraulic oil from the inlet port during the suction stroke and forcefully expels it through the outlet port during the discharge stroke,thereby generating the high pressure required for system operation.The key to its variable displacement capability lies in the adjustable swashplate,whose angle can be controlled hydraulically to vary the piston stroke length and,consequently,the pump's output flow,all while the input shaft speed remains constant.This fundamental principle allows the PAH50-100 to provide precisely the flow needed by the system at any given moment,eliminating wasteful energy expenditure.

　　2.Technical Specifications and Performance Characteristics

　　The PAH50-100 is defined by a set of impressive technical parameters that underscore its capacity as a high-pressure workhorse.It boasts a maximum continuous operating pressure of 350 bar,with the capability to handle peak pressures up to 400 bar for shorter durations,ensuring resilience against pressure spikes common in demanding cycles.The pump offers a nominal displacement of 100 cm³per revolution,placing it in a power class suitable for driving large-scale hydraulic actuators and motors.It is designed to function efficiently within a wide range of rotational speeds,typically from 1000 to 1800 RPM,making it compatible with standard industrial prime movers like electric motors and diesel engines.The pump is engineered for use with mineral-based hydraulic oils with a viscosity range of 10 to 160 cSt,and it maintains high volumetric and overall efficiency,often exceeding 95%,which directly translates to lower operating costs and reduced heat generation.

　　3.Design Features and Construction Details

　　Robust Componentry and Material Selection

　　The durability of the PAH50-100 is rooted in its selective use of high-grade materials and precision manufacturing.Critical components such as the cylinder block,pistons,and slippers are crafted from case-hardened steel to withstand high cyclic pressures and resist wear.The sliding surfaces within the pump,including the valve plate,are designed with optimized hydrostatic balancing and are often coated or treated to enhance their longevity and reduce friction.The pump housing is a high-strength cast iron,providing a rigid structure that maintains critical alignments under load and effectively dissipates the substantial heat generated during high-pressure operation.

　　Advanced Control and Regulation Mechanisms

　　A defining feature of this high-pressure pump is its integrated pressure compensator control.This system continuously monitors the output pressure and automatically adjusts the swashplate angle to reduce displacement when the set pressure is reached.This action effectively places the pump in a low-flow,high-pressure standby mode,minimizing power consumption and fluid heating.For more complex system requirements,options for load-sensing control are available,which adjust the pump's output to match the flow and pressure demands of the most critical actuator in the circuit.This sophisticated control capability is contained within a compact control group,designed for quick response and stable operation.

　　4.Primary Application Areas and Industry Solutions

　　The PAH50-100 finds its niche in industrial applications where high,sustained pressure is a fundamental requirement.In the metal forming industry,it is the power source for massive press brakes,stamping presses,and extrusion machines,where it delivers the immense force needed to shape metal.The construction sector utilizes this pump in heavy machinery like piling rigs,rock splitters,and hydraulic breakers,where its ability to endure shock loads and maintain pressure is critical.Another significant application is in plastic injection molding machines,where the pump provides the high clamping force and precise injection pressure control necessary for manufacturing high-quality plastic components.Its robustness also makes it suitable for test benches that simulate high-pressure environments and for industrial winches and hoists that require reliable lifting power.

　　5.Operational Advantages and Economic Benefits

　　Enhanced Energy Efficiency and Cost Savings

　　The most significant economic advantage of the PAH50-100 high-pressure oil pump is its potential for substantial energy savings.Its pressure-compensating and load-sensing capabilities ensure that the pump only delivers the flow and pressure required by the system,drastically reducing energy losses associated with throttling or overflow common in fixed-displacement systems.This"on-demand"operation leads to lower electricity or fuel consumption and significantly reduces the need for cooling systems to manage waste heat,resulting in a lower total cost of ownership.

　　System Reliability and Reduced Lifetime Costs

　　The pump's rugged construction and use of premium materials contribute to exceptional service life and reliability,even in the most demanding 24/7 operational environments.This longevity directly reduces downtime and maintenance costs.The design also emphasizes serviceability,with a modular construction that allows for the replacement of wear parts without requiring a full pump overhaul.Furthermore,its high contamination tolerance,supported by a recommended filtration level of NAS 1638 class 8,ensures stable operation and protects downstream components,thereby enhancing the reliability of the entire hydraulic system.

　　Frequently Asked Questions(FAQs)

　　What is the primary functional difference between the PAH50-100 and a fixed displacement high-pressure pump?

　　A fixed displacement pump delivers a constant volume of fluid per revolution,meaning its output flow is directly tied to its shaft speed.To vary the speed of an actuator or to hold pressure without flow,a complex system of valves is required,which often results in significant energy loss as heat.The Danfoss PAH50-100,as a variable displacement axial piston pump,automatically adjusts its output flow by changing the swashplate angle.This allows it to provide exactly the flow needed by the system or to maintain pressure with minimal flow,leading to far greater energy efficiency,lower operating temperatures,and reduced wear on system components.

　　Can the PAH50-100 be used in mobile applications,or is it strictly for industrial use?

　　While the PAH50-100 is engineered with a robust,cast iron housing that makes it ideal for harsh industrial settings,its fundamental technology is also applicable to mobile machinery.However,for typical mobile equipment where weight and compactness are critical,dedicated mobile-series pumps are often preferred.The PAH50-100 is best suited for stationary industrial applications or very large mobile equipment where its high-power density and maximum pressure capability are the primary selection criteria,and its weight is less of a concern.

　　What type of maintenance is required to ensure the long service life of this pump?

　　The key to maximizing the service life of the PAH50-100 is maintaining fluid cleanliness.Regularly monitoring and replacing hydraulic filters according to the recommended service intervals is paramount.Periodic oil analysis can provide early warning of internal wear or contamination.It is also crucial to operate the pump within its specified pressure,speed,and temperature ranges.During routine maintenance,checks for external leaks,unusual noise,or elevated case drain flow can help identify potential issues before they lead to a major failure.Following Danfoss's specific commissioning and break-in procedures is also essential for long-term reliability.

　　How does the pressure compensator control benefit the overall hydraulic system?

　　The pressure compensator acts as an intelligent,self-regulating device that optimizes pump operation.By reducing the pump's displacement to a minimal level once the set system pressure is achieved,it drastically cuts down on power consumption and heat generation.This not only saves energy but also protects the entire hydraulic system from the detrimental effects of excessive heat,such as accelerated oil degradation and seal failure.It also simplifies the system design by integrating a critical control function directly into the pump,reducing the need for additional pressure relief and flow control valves.

　　Is the PAH50-100 compatible with bio-degradable or fire-resistant hydraulic fluids?

　　Yes,the Danfoss PAH50-100 is generally compatible with a range of hydraulic fluids beyond standard mineral oil,including many types of fire-resistant fluids like HFA,HFB,HFC,and some biodegradable oils.However,compatibility is dependent on the specific fluid formulation and its properties,such as viscosity and lubricity.It is absolutely critical to consult the official Danfoss technical documentation or contact their application engineering support for confirmation before using any non-standard fluid,as material compatibility and potential impacts on performance and warranty must be verified.