High-Performance Hydraulic Accumulators & Fluid Power Energy Storage

SCHWERLL manufactures a series of standard piston accumulators in strict compliance with the certification requirements for special‑purpose equipment in major countries and regions worldwide. These accumulators are designed to withstand pressures of up to 200 MPa, with individual units offering nominal volumes of up to 1,500 L. They are suitable for applications involving high‑frequency transfer functions at frequencies of 200 Hz and above, with piston speeds reaching a maximum of 9 m/s. SCHWERLL’s piston accumulators are engineered for a wide range of demanding operating conditions and media, and the company provides specialized solutions tailored to fluids such as water‑glycol, phosphate ester, and mineral hydraulic oils.

Schwerll standard piston accumulators are suitable for the vast majority of industrial applications, compatible with mineral hydraulic oils, water‑emulsions, water‑glycol fluids, phosphate esters, and other media. The products comply with the special‑equipment regulations and standards of the country or region where they are installed and used. Individual piston accumulators offer capacities up to 1,500 L, with design pressures reaching as high as 207 MPa, and piston speeds of up to 5 m/s. Sever in piston accumulators can be equipped with a variety of proven gas‑charged fluid‑level monitoring systems.

The Seville standard bladder accumulator series uses native rubber and a special process to produce bladders with low permeability, high fatigue life, high and low temperature resistance, and special material adaptability for special media.

The SCHWERLL bladder accumulator system is designed and manufactured on SCHWERLL’s proprietary production line. Upon leaving the factory, it meets stringent requirements for cleanliness, safe system integration, and compact construction. Its configuration complies with national regulatory standards for auxiliary safety components, and the complete unit undergoes comprehensive factory acceptance testing before delivery, with modularized shipment.

Piston accumulator system integration—featuring volumetric matching and hardware configuration tailored to user‑specific operating conditions in accordance with thermodynamic equations—is a standard offering from SCHWERLL. Compared with hydraulic systems or piston accumulator systems manufactured in‑house by OEMs, SCHWERLL piston accumulators boast product and system certification standards, modular delivery of the complete system, a high‑cleanliness delivery condition, and enhanced safety in the overall system design and construction details.

SCHWERLL SA-type oil‑side safety and shut‑off valve block, comprising a valve block, a built-in relief valve, a main shut‑off valve, and a manual or electric unloading valve, with pressure‑oil and return‑oil passages as well as the necessary pressure‑measurement ports.

The SCHWERLL mobile nitrogen booster cart uses a piston accumulator for pressurization, delivering a high inflation flow rate and enabling rapid charging of large accumulator systems. Additionally, in consideration of confined working spaces and the need for mobile inflation, SCHWERLL has developed and markets the MINI‑type nitrogen booster unit.

Traditional flow‑synchronization systems, such as those used for penstock gate valves in hydropower stations, typically require six sets of synchronizing servomotors. These systems rely on either synchronous motors or mechanical linkages—often employing a mechanical lead‑screw drive to achieve synchronization—but they suffer from issues like reduced accuracy due to wear and tear, as well as potential lead‑screw breakage caused by air pockets in the mechanical transmission. In contrast, the SCHWERLL hydraulic servo digital control system achieves digital synchronization via a hydraulic servo control loop and employs a multi‑channel hard‑sync cylinder design driven by piston accumulators equipped with energy‑monitoring capabilities. This enables emergency shutdown functionality under fault conditions, ensuring long‑term repeatability of synchronization accuracy and high‑precision hard synchronization even during complete power loss. Meeting the stringent requirements of applications such as penstock gate valves—where high precision, excellent repeatability, and reliable emergency synchronization under total power‑outage conditions are critical—the SCHWERLL system represents the optimal synchronization solution.