High-pressure hydraulic accumulators, piston cylinders, bladder units, safety valve blocks, and turn-key fluid power systems manufactured to ASME, CE/PED, and ISO standards.
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 in target installation jurisdictions. 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. SCHWERLL piston accumulators can be equipped with a variety of proven gas‑charged fluid‑level monitoring systems.
The SCHWERLL standard bladder accumulator series uses high-grade synthetic elastomer compounds and a special process to produce bladders with low permeability, high fatigue life, wide-range thermal endurance (-40°C to +120°C), 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.
In accordance with the accumulator standards of major countries worldwide, such as EN 14359, ASME, and TSG 21‑2016, the oil‑side outlet of an accumulator must be equipped with essential components, including shut-off valves and safety relief valves. SCHWERLL offers integrated safety and shut-off valve blocks for the oil‑side outlet of accumulators, supplied as pre‑assembled units for seamless connection. These standard valve assemblies are installed at the outlet of each bladder accumulator in the accumulator station, enabling functions such as shut-off, safety relief, hydraulic fluid inlet and outlet, and manual or electric return‑oil operation.
SCHWERLL gas-side safety and shut-off valve block, installed on the gas-side piping of accumulator systems, integrates inflation, pressure monitoring points, a gas safety valve, and a one-way shut-off function into a single unit, making it suitable for standard accumulator system module construction.
SCHWERLL valve block for the nitrogen side, featuring a one-way shut-off function: in the normal operating state, it remains open, allowing bidirectional nitrogen flow; when closed, nitrogen is permitted to flow only from the accumulator toward the nitrogen cylinder side. Utilizing this valve block significantly enhances charging efficiency in accumulator systems during inflation, thereby reducing installation and commissioning time.
In closed-loop systems, the use of conventional hydraulic reservoirs is constrained by system dynamics and installation space; therefore, pressurized reservoirs must be employed to form a closed hydraulic circuit, thereby reducing the overall equipment footprint.
The diaphragms supplied by SCHWERLL for welded‑type diaphragm accumulators are low‑permeability diaphragms, manufactured in France. They are long‑term OEM components, with diaphragm capacities ranging from 0.1 L to 4 L.
When aluminum alloys, aluminum–magnesium alloys, magnesium alloys, and other metals are formed by die‑casting, it is necessary to account for the forming process, including rapid injection control (for shaping) and pressure‑holding control (for fine solidification). The forming process typically employs a piston‑accumulator system as the power source and is driven by a hydraulic servo‑controlled rapid‑forming system. As the actuating element, the hydraulic cylinder must achieve a piston‑rod speed of 8–12 m/s, necessitating the use of high‑speed servo‑driven injection cylinders to complete the injection‑forming operation. Key characteristics of these injection cylinders include:
SCHWERLL high‑performance, seamless, integral‑molded stationary pressure vessels and cylinders, with individual capacities up to 2,000 L, are designed to meet cyclic pressure service requirements, featuring design pressures of up to 35 MPa or 45 MPa.
