A plunger cylinder is distinguished by its robust and simple design. Unlike a conventional double-acting piston cylinder, it lacks an internal piston head. Instead, the solid plunger rod​ itself acts as the pressure-receiving surface, moving in and out of the single-pressure-chamber barrel.

Hydraulic fluid enters the single port at the base, applying pressure directly to the entire cross-sectional area of the plunger rod. The extending force is calculated as F_extension = System Pressure (P) × Plunger Rod Area (A_rod)

As a predominantly single-acting​ device, it has no hydraulic pressure for retraction. Retraction is accomplished by:

1. Gravity​ (in vertical applications).

2. An external load or spring.

3. A separate return cylinder​ in a duplex setup.

A single set of seals is housed in the cylinder head, sealing against the plunger rod. This results in a simple seal arrangement, easy maintenance, and exceptional resistance to buckling​ due to the large rod diameter.

Tailored for the core needs of enterprises in metallurgy, mining, and construction machinery industries:
Unstable Heavy-Load Operation：Plunger adopts 45# forged steel quenching and tempering treatment, with a maximum rated thrust of 6300kN, ensuring no deformation under long-term full load.
High Maintenance Costs：Imported high-pressure sealing components + cylinder nitriding treatment reduce failure rate by 40% and extend maintenance cycle to 18 months.
Mismatched Scenarios：Supports flange/threaded/hinge shaft connections, with a fully customizable stroke range of 500-5000mm, suitable for continuous casting machines, gantry cranes, hull jacking and other scenarios.

Enterprise-Grade Service Guarantee
Pre-Evaluation Service: Free load/pressure matching calculation for customer equipment to avoid selection errors.
Delivery Efficiency: In-stock for standard models within 7 days; delivery of customized models within 20 days.
After-Sales Response: 6 service stations nationwide, on-site fault resolution within 24 hours (on-site engineers assigned for large projects).

Typical Cooperation Cases
A Steel Group: Continuous casting machine steel pushing system. After replacing the original cylinder, the continuous operation time of the equipment increased by 25%.
A Shipbuilding Heavy Industry: Hull block jacking project. The synchronization accuracy of 12 SBM cylinders is controlled within ±0.5mm.