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concrete mixer pump PV21

The PV21 and PV23 hydraulic pumps, manufactured by Sundstrand, are axial piston pumps designed for high-reliability operation in concrete mixer hydraulic systems. They can be used in both open and closed circuit systems, providing sufficient flow and pressure for heavy-duty concrete mixing. The PV21 has a displacement of 21 cm³ per revolution, while the PV23 displaces 23 cm³ per revolution. Maximum operating pressures reach 350 bar for PV21 and 360 bar for PV23, with maximum flows of 120 and 130 liters per minute, respectively. Each pump weighs approximately 55–60 kg, and the required input power at operational speed is around 100 kW.

The repair process begins with removing the pump from the hydraulic system and inspecting the housing and external connections for leaks or cracks. The cylinder block, pistons, swash plate, and drive shaft are measured using precision tools such as micrometers and gauges. Worn or damaged components are replaced to restore hydraulic performance and flow to factory specifications. All auxiliary components, including seals and O-rings, are also replaced to minimize leakage and prevent future failures.

After reassembly, the pump undergoes comprehensive performance testing. Operating pressure, output flow, input torque, and noise levels are mea


parsianrahbalandeh	02155130771

hyper-boxel

Iran

021-55407112

Mixer Drum with ZF and Italian Gearbox

Mixer drums with ZF and Italian gearboxes are industrial equipment designed for high-quality concrete production in construction projects. These drums are typically manufactured with capacities ranging from 3 to 12 cubic meters and made from alloy steel with 6 to 10 millimeter thickness. Rotation is powered by an industrial ZF or Italian gearbox with hardened gears. The driving motor, diesel or electric, delivers the required torque efficiently. The shaft and internal blades are made of high-strength steel with precise welding, ensuring uniform material mixing. Gear ratios and rotation speed are optimized for complete and homogeneous concrete blending.

Structurally, the mixer drum features a reinforced steel frame with anti-corrosion coating and industrial paint. ZF and Italian gearboxes operate with high-pressure lubrication and optimized cooling. The power transmission system includes shaft, coupling, and industrial bearings designed to handle radial and axial loads. The drum operates reliably within minus 20 to plus 50 degrees Celsius. Each unit undergoes functional testing, mixture uniformity inspection, and load testing prior to delivery to ensure durability and performance. These drums are suitable for high-volume construction, civil, and industrial projects.


hyper-boxel	021-55407112

hydraulicpaytakht

Iran

021-55770712

mixer

A check valve is a one-way valve designed to prevent backflow of fluid in hydraulic, pneumatic, and industrial piping systems. Typical operating pressure ranges from 1 to 300 bar, and flow rate depends on size and type, ranging from a few liters to several thousand liters per minute. The valve body is made of steel, stainless steel, or bronze, capable of withstanding temperatures from -20 to 200°C. Internal design includes a disc, spring, or ball that opens and closes with fluid flow, ensuring unidirectional flow and minimal internal leakage.

Structurally, the check valve consists of the main body, disc or ball, spring, valve seat, and durable seals. Installation can be vertical or horizontal, with connection via threaded, fitting, or standard flange. Seals are made of NBR, Viton, or PTFE, providing resistance to pressure, temperature, and chemicals. This valve is suitable for hydraulic, pneumatic, water, oil, and chemical industries, with service life exceeding 50,000 operating hours.