Zupper Hollow Plunger Hydraulic Cylinder 20-Ton 50mm RCH-2050

While standard solid hydraulic jacks are designed strictly for lifting compressive loads, certain mechanical and civil engineering tasks require active pulling, tensioning, and extraction forces. The Zupper hollow plunger hydraulic cylinder RCH-2050 is a specialized single-acting, spring-return hydraulic cylinder. Featuring a 27mm center hole, this hollow plunger design allows threaded rods, steel shafts, or cables to pass completely through the cylinder body, transforming standard hydraulic pressure into a highly controlled, linear pulling mechanism.

Unlike locking jacks used for prolonged load holding, the RCH-2050 is an active-operation tool. Once the tensioning or extraction task is complete, the hydraulic pressure is released, and the heavy-duty internal spring rapidly retracts the plunger to its original position.

Zupper hollow plunger hydraulic jack 20-ton 50mm RCH-2050

Core applications: Post-tensioning and mechanical extraction

By accommodating a central shaft, the hydraulic cylinder RCH-2050 is the primary tool for two distinct heavy industrial applications across the construction and maintenance sectors.

Post-tensioning cables in civil engineering

In modern concrete construction and bridge building, reinforcing steel cables (tendons) must be stretched before the concrete fully cures. The hollow core allows the pre-stressing cable to pass through the jack. When connected to a 700-bar hydraulic pump, the cylinder extends, gripping and tensioning the cable to the exact structural specifications required to prevent concrete deflection.

Bearing assembly and disassembly in industrial plants

For mechanical maintenance engineers handling heavy rotary equipment, extracting a seized bearing or pressing a massive gear onto a shaft is a high-friction challenge. By passing a threaded puller rod through the Zupper RCH-2050, maintenance crews can apply up to 20 tons of smooth, controlled hydraulic force to safely extract large bearings without using open flames or destructive hammering, thereby protecting the expensive machine shafts.

Engineering directive: Safe working load and stroke limits

Because a hollow plunger cylinder sacrifices central surface area to accommodate the through-hole, the cylinder walls and internal seals endure significantly higher concentrated stress compared to solid cylinders. To maximize the operational lifespan of the Zupper RCH-2050 and prevent seal blowouts under 700-bar (10,000 psi) pressure, our technical team strictly enforces the following operational parameters:

• Optimal working load (14 - 16 Tons): While rated for a maximum capacity of 20 tons, we highly recommend operating this cylinder at 70% to 80% of its maximum capacity for continuous duty. If your specific project requires a constant, sustained pulling force of full 20 tons, civil contractors should consider a 30-ton structural upgrade to ensure a safe operational buffer.

• Stroke limitation protocol: The maximum physical stroke is 50mm. However, to protect the internal stop ring and the return spring mechanism from deformation caused by pressure spikes, operators should ideally limit the extension to 40mm - 45mm during standard tensioning cycles.

• Valve maintenance: As with all high-pressure hydraulic equipment, technicians must strictly use wrenches or hex keys when servicing the pump linkages. Screwdrivers must never be used, as they will strip the fittings and compromise the system's integrity.

Specifications for Zupper RCH-2050

Please review the critical dimensions and capacities below to ensure compatibility with your threaded rods and hydraulic setups:

Recommended system component: Zupper CP-700 manual pump

The RCH-2050 is a dependent cylinder that requires an external 700-bar power source to operate. For field operations and precise tensioning control, we highly recommend pairing this cylinder with the Zupper CP-700 manual hydraulic hand pump. Engineered to deliver a consistent 10,000 psi output, this two-speed pump allows for rapid cylinder advancement and micro-adjustments under heavy loads, making it the standard pairing for all Zupper single-acting cylinders. Click here to view Zupper CP-700 manual pump specifications and pricing.

Zupper Hydraulic Hand Pump 700 Bar CP-700

Regional B2B fulfillment for Singapore and Malaysia

At Asia Pro Equip, we supply genuine, high-grade hydraulic tensioning tools to civil contractors and maintenance facilities. We maintain active inventory of the Zupper RCH-2050 across our regional logistics hubs, ensuring rapid dispatch to industrial zones and construction sites throughout Singapore and Malaysia.

To request a transparent corporate quotation or to verify compatibility with your existing 700-bar manual or electric hydraulic pumps, please contact our procurement team directly. All pricing follows our strict corporate pricing policy, ensuring stable and fair valuations for your project bidding requirements.

Corporate Sales & RFQ: [email protected]