Hydraulic Accumulator Sizing: piston
Hydraulic accumulator sizing parameters for bladder, piston, and diaphragm types — precharge pressure ratios, polytropic gas law exponents (adiabatic n=1.4, isothermal n=1.0), usable volume efficiency, maximum operating pressure, flow rate limits, temperature range, and application-specific sizing guidance per Parker, Bosch Rexroth, and Hydac engineering data
| accumulator type | record id | application category | gas law | max flow rate gpm (gpm) | max operating pressure psi (psi) | max pressure ratio p2 p0 (dimensionless) | polytropic n (dimensionless) | precharge ratio notes | precharge ratio p0 p1 (dimensionless) | response time category | sizing notes | standard sizes liters | temp max c (degC) | temp min c (degC) | usable volume efficiency (dimensionless) | volume ratio v1 v0 formula |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| piston | piston_energy_storage | energy_storage | adiabatic | 500 | 5,000 | 10 | 1.4 | P0 = P1 - 100 psi (minimum 100 psi below minimum system) for piston type; avoids seal blow-by | 0.9 | rapid | Higher efficiency (92%) vs bladder (75%); handles wider pressure ratios up to 10:1; better for large volumes | 0.5,1,2,5,10,20,38 | 107 | -54 | 0.92 | V0 = (delta_V * P1^n * P2^n) / (P2^n - P1^n) / P0^n; piston uses same gas law formula |
| piston | piston_high_pressure | energy_storage_hp | adiabatic | 800 | 6,000 | 10 | 1.4 | P0 = P1 - 100 psi; high-pressure piston units standard to 6000 psi | 0.9 | rapid | Piston type preferred when >5000 psi required; weld-end construction; Hydac SK 600 series up to 6000 psi; Parker HDP series | 0.5,1,2,5,10,15 | 107 | -54 | 0.92 | Same formula as piston_energy_storage; higher pressure rating |
| piston | piston_large_volume | large_volume | isothermal | 300 | 3,000 | 8 | 1 | P0 = P1 - 100 psi; large volume piston accumulators | 0.92 | slow | Large volume piston for long hold times; isothermal n=1.0; volumes to 200+ liters; used in press/clamp/die-casting circuits | 20,38,75,150,200 | 107 | -54 | 0.92 | Isothermal preferred for large volume slow-discharge applications; delta_V = V0*(P0/P1 - P0/P2) |
This is a sample. Search the full hydraulic accumulator sizing dataset and 300+ more by creating a free account and accessing the database.
Get started for FREE