American StandardAccumulators(ASME)

Hydraulic accumulators are energy storage components in hydraulic systems. They store pressure energy of hydraulic oil converted into other forms of energy, and release pressurized oil when required by the system to realize energy recovery, pressure stabilization, shock absorption and other functions. They are essential auxiliary parts for hydraulic power stations, construction machinery, injection molding machines, hydraulic filtration equipment and other machinery.

Energy conversion is realized between compressible media (mainly nitrogen) and incompressible hydraulic oil:

.Charging phase: High-pressure oil from the hydraulic pump flows into the accumulator and compresses the internal nitrogen, converting pressure energy into internal gas energy for storage.

.Discharging phase: When system pressure drops, the high-pressure nitrogen expands to push oil out, supplying pressurized oil to supplement system flow rate.

.Nitrogen is the universally adopted medium in the industry. Oxygen and air are strictly prohibited, as they may cause fire and explosion under high pressure.

1. Auxiliary Power Source for Energy Conservation For intermittent high-flow operations (clamping, rapid traverse, lifting): The pump continuously charges the accumulator with low flow. During working strokes, the accumulator supplies oil. This enables adoption of smaller pumps and motors and reduces energy loss under no-load conditions.
2. Pressure Holding & Internal Leakage Compensation For pressure-maintaining processes (injection mold clamping, fixture clamping): The pump stops operation while the accumulator offsets internal system leakage to hold the preset pressure for a long time, minimizing frequent pump start-stop cycles.
3. Hydraulic Shock Absorption, Vibration and Noise Reduction Sudden closure of directional valves and abrupt stopping of cylinders create water hammer surges. The accumulator instantly absorbs peak pressure to safeguard valves, pipelines, filters and pressure gauges, and mitigate vibration and noise.
4. Compensation for Volume Variation and Thermal Expansion Temperature fluctuations cause thermal expansion and contraction of hydraulic oil. The accumulator accommodates volume changes to stabilize system pressure.
5. Emergency Power Source (Safety Backup) Upon power cut or pump malfunction, the accumulator discharges stored pressurized oil to complete safe equipment reset and secure clamping, guaranteeing operational safety.
6. Flow Pulsation Damping It absorbs flow pulsations produced by piston pumps and gear pumps, stabilizes supply pressure, and enhances the control accuracy of precision hydraulic systems.

construction machinery (excavators, lifting vehicles), metallurgical steel rolling equipment, injection molding machines, hydraulic pump stations, pressure buffering for filtration systems, coal mine hydraulic machinery, automated tooling fixtures, marine hydraulic systems