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.
Accumulators, particularly accumulator systems, are required to deliver extremely high‑rate, instantaneous hydraulic flows when serving as power sources or providing auxiliary flow functions. However, measuring and controlling such transient ultra‑large flows is highly challenging. To address this, SCHWERLL has developed an integrated liquid‑side pressure‑line system with large‑diameter conduits, enabling precise control and distribution of high‑flow rates on the accumulator system’s liquid side.
For nitrogen‑pressure monitoring in accumulator systems and hydraulic‑fluid pressure measurement in hydraulic systems, SCHWERLL offers high‑precision pressure sensors, available with digital display and both digital and analog outputs. The pressure sensors supplied by SCHWERLL have been rigorously tested over long service lives in hydraulic and accumulator applications, demonstrating reliable performance. These are well‑established products, featuring sensor interfaces that fully match the standard ports on system valve blocks, while maintaining a compact installation footprint.
SCHWERLL supplies high‑pressure gas (or liquid) safety valves with stable performance, compliant with DN6 and DN9 specifications and equipped with pipeline‑mounted overflow discharge ports. Our products meet international standards such as CE and ASME, and their testing is conducted by authorized laboratories in accordance with I.S.P.E.S.L. or ASME national codes. In China, if you require a calibration certificate that complies with the Chinese TS standard, please specify this when placing your order.
Excessive nitrogen temperature within the accumulator system can lead to overpressure, causing thermal damage to component parts. System operation also imposes strict temperature‑control requirements for the hydraulic fluid. Drawing on years of experience in demanding operating conditions, SCHWERLL offers users a range of temperature sensors designed to monitor nitrogen‑related issues in the accumulator system or to measure the hydraulic fluid temperature in the hydraulic circuit.
When operating conditions demand that the hydraulic flow characteristics supplied by the power source exhibit ultra‑high speeds and require local control, conventional hydraulic systems can no longer meet the requirements of on‑site high‑speed control. The solution is to shorten the fluid‑transmission system’s pipeline length and increase the control pressure to achieve a higher energy‑density output. Under such conditions, a pneumatic‑hydraulic intensifier provides an excellent solution.
SCHWERLL gas pressure piping employs components and fabrication techniques that meet stringent requirements for minimizing gas‑molecule leakage. The products utilize stainless‑steel piping, complying with the design and manufacturing standards for gas pressure pipelines in China and in the countries where they are installed, including adherence to the TSG‑D0001 standard for metallic pressure pipelines (covering design and fabrication requirements for pressure pipelines with diameters of 50 mm or greater).
SCHWERLL liquid drain valves are typically installed at the bottom of gas cylinders or at the lowest point of a system. For certain horizontally mounted vessels, an internal stainless-steel flushing line may need to be pressurized. The standard product interface is G3/4–ISO 228 (the universally used connection size for gas cylinders). The design pressure is 350 bar, with a nominal diameter of DN 4 mm. Liquid drain valves for higher pressures are available, depending on the user’s operating conditions.
The SCHWERLL gas‑liquid piston‑type shock absorber is a high‑precision damping device. Compared with spring‑based dampers, it offers superior repeatability and smoother vibration suppression, and when installed in vehicle seats or speedboat seating, it can effectively enhance driver comfort.
The bladder of SCHWERLL’s standard‑specification bladder accumulators is manufactured using an adhesive‑bonding process. Following simulation‑based design, the bladders are produced on a dedicated production line, delivering exceptional long‑term durability. The diaphragm exhibits low permeability, providing an ideal solution for high‑end applications.
For large‑scale piston‑type accumulator systems, SCHWERLL can supply high‑performance cylindrical gas cylinders. These high‑performance cylinders feature high pressure ratings (design pressures up to 60 MPa) and large capacities (nominal volumes of up to 2,000 L per unit), with mounting dimensions tailored to the calculated flow rates. However, subject to the constraints of China’s special equipment regulations and standards, SCHWERLL currently offers only cylindrical gas cylinders that comply with ASME and PED standards; certified products meeting Chinese special equipment regulatory requirements are not yet available.
In industries such as low-pressure water treatment (16 bar and below), the Xiwel low-pressure, large-capacity bladder accumulator can be selected, with capacities up to 5,000 L. The internal bladder of this cushioning accumulator provides isolation, delivering excellent resistance to fouling and making it suitable for use with water and other corrosive liquid media.
When the system requires stable flow regulation for a liquid—such as cooling water—a stainless steel cooling‑water pressure regulator must be installed in the piping. This regulator stabilizes the system’s water pressure, thereby delivering cooling water at a consistent pressure to the load side.
SCHWERLL’s outstanding flow‑control and distribution technology demands high‑quality ball valves. SCHWERLL designs and manufactures large‑bore, high‑pressure ball valves that deliver reliable shut‑off performance; even at a nominal diameter of DN125 and a pressure rating of 35 MPa, these valves can be safely opened and closed via manual lever operation.
SCHWERLL plug‑in flanges are specifically designed for large‑diameter pressure pipelines. Addressing the challenges inherent in installing flanged connections on such pipelines—such as difficult installation heights, alignment issues, and cumbersome seal‑replacement procedures—SCHWERLL’s plug‑in flanges feature a separate sealing element mounted on an independent insert. The hard‑seal system installed on both sides of this insert effectively compensates for installation deviations and simplifies seal replacement. These flanges accommodate nominal diameters up to DN 15,000 mm and can withstand working pressures of up to 100 MPa.
Sivir supplies high‑performance bladder accumulators for the industrial sector, with design pressures up to 690 bar and capacities of up to 300 L. The outer diameter range includes 299, 325, 351, 356, and 426 mm, and the interface sizes are tailored to meet high‑flow operating requirements.
Compared with rubber diaphragms and metal pistons used as internal gas–liquid separation elements in accumulators, metal bellows offer superior gas tightness. For pressurized nitrogen service, their intrinsic nitrogen permeability is virtually zero. Leveraging this property, high-pressure metal‑bellows accumulators are well suited for applications where replenishing nitrogen is challenging, such as subsea ROV systems, underwater unmanned vehicles, hydraulic control systems within spacecraft cabins, and ultra‑compact vibration‑damping accumulators in vehicles.
