GARDNER DENVER FK-FXK Pump

The cornerstone of chassis -- stability

The frame of the FK-FXK power end is cast in one piece using high strength alloy cast iron or ductile cast iron.

The crankshaft and gear system -- the heart of power transmission

Crankshaft: As the core component that converts rotational motion to reciprocating motion, the FK-FXK crankshaft is made of the finest forged alloy steel (35CrMo or 40CrMnMo).

Gears: The smoothness and efficiency of power transmission are guaranteed by the continuous herringbone gears (Herringbone Gears) we use.

The link and the crosshead -- convert power into action

Connecting Rod: The FK-FXK connecting rod is integrally manufactured from high-strength, ductile ductile iron. At the crankshaft's large end, we employ a high-lead bronze bushing, while the crosshead pin end utilizes bronze bushing. These bearing materials are meticulously selected for their exceptional self-lubrication properties and superior wear resistance with anti-galling performance, ensuring reliable operation even under extreme load conditions.

Crosshead: As the critical component connecting the power end and hydraulic end, the crosshead withstands tremendous reciprocating impact forces. Our crosshead utilizes integral alloy cast iron with specially reinforced construction around the pin holes, designed to accommodate oversized crosshead pins and ensure exceptional structural strength.

The bearing and lubrication system -- ensure long and smooth operation

Bearings: Our eccentric spindle is equipped with heavy-duty tapered roller bearings, while the pinion shaft utilizes roller bearings. These industrial-grade bearings, meticulously designed through precision calculations and selection processes, can simultaneously withstand significant radial and axial loads. This configuration ensures optimal rotational accuracy and stability throughout the transmission system during high-speed operation under heavy-load conditions.

Lubrication System: The FK-FXK's power end utilizes a simple yet highly reliable oil bath splash lubrication system. The massive oil reservoir in the crankcase ensures ample lubricant supply for all moving components. As gears and the crankshaft rotate, the lubricating oil is continuously agitated and "splashed" into every corner, forming a protective film that effectively reduces friction and heat buildup.

Cylinder (module)

The FK-FXK hydraulic cylinder modules are critical components designed to withstand extreme pressure. Constructed from premium forged alloy steels (35CrMo, 40CrMnMo, or 4135 steel), each module undergoes rigorous quenching and tempering heat treatment after forging. This process ensures optimal mechanical properties, enabling them to endure cyclic pressures up to 7,500 PSI or higher without developing fatigue cracks.

Cylinder sleeve -- the first line of defense against wear

The cylinder liner is one of the fastest worn parts in the hydraulic end, and its quality directly affects the life of the piston and the overall efficiency of the pump. Our standard high-chromium bimetal cylinder liner is the top solution in the industry.

Composite Structure: This cylinder liner features a dual-layer design. The outer shell is forged from high-strength carbon steel (AISI 1045), providing sufficient toughness and strength to withstand the high pressure within the pump chamber while preventing thermal expansion cracks under high-pressure conditions. The inner liner is made of high-chromium cast iron alloy produced through centrifugal casting, containing over 27% chromium content.

Excellence in Performance: Centrifugal casting ensures a dense, defect-free high-chromium lining with exceptional hardness (Rockwell hardness reaching HRC ≥61−65). This remarkable hardness endows the cylinder liner's inner wall with superior wear resistance, effectively resisting erosion from abrasive particles like quartz sand in drilling fluids. The integrated design combining both inner and outer components enables bimetallic cylinder liners to maintain an average service life exceeding 800 hours – 2-3 times longer than conventional counterparts. This significantly reduces downtime caused by liner replacements during drilling operations.

The force that drives the fluid with the piston and the piston rod --

Piston: Our standard piston assembly features a high-quality forged steel piston core bonded with specially formulated rubber compound. Depending on the mud system (water-based or oil-based), materials such as nitrile rubber or polyurethane are selected to ensure optimal heat resistance, oil tolerance, and wear performance.

Piston Rod: We utilize premium alloy steels such as 42CrMo as raw materials for piston rods. The manufacturing process is highly rigorous, involving forging and integral tempering heat treatment to achieve superior mechanical properties. Subsequently, surface treatments like chromium plating are applied to enhance surface hardness, wear resistance, and corrosion resistance.

Valve assembly (valve body and valve seat) -- Guardian of pressure control

Premium Materials: Our valve body and seat are manufactured from high-quality low-carbon alloy steels such as AISI 4119 or AISI 8620 through precision forging. This integrated forging process ensures a dense internal structure and continuous grain flow lines, eliminating potential weaknesses that could arise from welding or casting processes at the source.

Deep carburizing process: The forged valve body and valve seat will undergo a key "deep carburizing" (Deep Carburizing) heat treatment process.

Precision Machining: To ensure a flawless metal-to-metal seal between the valve body and seat, we perform final precision machining after heat treatment. Using high-precision CNC machine tools, we meticulously refine the working conical surfaces of both components, achieving precise dimensional alignment and angular matching.

Gardner Denver FK-FXK Key technical specifications

This table outlines the core design parameters of the FK-FXK slurry pump to help you quickly assess whether it meets your basic operational requirements.

FK-FXK slurry working condition performance parameter table

This table details the pressure and displacement of the FK-FXK slurry pump at different cylinder liner sizes. Please note that the displacement data is based on theoretical calculations and actual displacement will vary slightly due to volumetric efficiency.

Note: Some displacement data are calculated based on geometric formulas and existing data points to ensure the integrity and consistency of the data sheet. All performance ratings are based on 90% mechanical efficiency and 100% volumetric efficiency.

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