Spring-Return Cable Puller PSTS

Hydraulic Bolt Tensioners with Spring Return – PSTS

The PSTS series of hydraulic bolt tensioners with integrated return spring is the optimal solution for fast, safe, and repeatable bolted connections in high-pressure industrial applications. By axially stretching the bolts, the desired preload force is applied directly to the connection, completely torsion-free and without friction losses in the thread. The integration of a mechanical return spring elevates this series to a new level of process speed and operational safety.

Functionality and Advantages of Automatic Spring Return

The use of PSTS bolt tensioners significantly streamlines the assembly process for heavy flange connections and in mechanical engineering.

After positioning the tool and building up hydraulic pressure, the bolt is precisely stretched, allowing the nut to be turned without load. As soon as the operating pressure is released via the hydraulic power unit, the integrated return spring automatically retracts the cylinder's piston to its initial position in a matter of seconds.

The time-consuming manual return stroke, which often has to be performed by hand with standard cylinders, is completely eliminated. This ensures minimal cycle times in series assembly and reduces the effort required by assembly personnel to a minimum.

Technical Highlights of the PSTS Series:

• Maximum time savings in continuous operation. Thanks to the automatic piston return, the tool is immediately ready for the next tensioning operation. For large flanges with many bolts, this time advantage adds up to a significant reduction in downtime and assembly times.
• Wear-free power transmission. Since there is no rotational movement under load during hydraulic tensioning, seizing of the thread is impossible. This protects both the bolts and the high-quality interchangeable bushings of the PSTS cylinder, leading to extremely long service lives in demanding industrial environments.
• Compact and robust design. Despite the integrated spring return technology, the PSTS series features optimized external dimensions and a low dead weight. This enables reliable use even in confined spaces or for overhead installations in pipeline and apparatus construction.
• Highest operational safety. The closed design protects the return spring from contamination and damage in harsh construction site or workshop environments. In addition, the controlled movement of the piston prevents operating errors and jammed tools when releasing pressure.

At hyTool, quality comes first. Our tools and systems are reliable, durable, and meet all relevant national and international standards. Each product is tested, documented, and designed for continuous professional use – so you can rely on safe and reproducible results in every application.