● Polytropic Exponent m and nT1: Temperature after change (ºC)P0: Gas pressure before temperature change (MPa · abs) T0: Temperature before change (ºC) [−35≤T1≤110ºC]P1: Gas pressure after temperature change (MPa · abs) Introduction １０.２０３９×Ｐ０ ＋１ Average Pressure (MPa)Pressure : PaShock Pulsation : Px<15<2.02.0≤, <3.53.5≤, <5.05.0≤, < 6.56.5≤, <8.08.0≤, <9.59.5≤, <11.011.0≤, <12.512.5≤, <14.014.0≤, <15.515.5≤, <17.017.0≤, <18.518.5≤, <20.020.0≤, <21.521.5≤, <23.023.0≤, <24.524.5≤, <26.026.0≤, <27.527.5≤, <29.029.0≤, <30.530.5≤, <32.032.0≤, <33.533.5≤, <35.015≤, <3030≤, <6060≤, <120120≤, <240240≤, <480480≤, <900900≤, <18001800≤● Gas Charging Pressure P1* It can be calculated easily with the NACOL volume calculation program.Oil Charge Time (Tm) · Oil Discharge Time (Tn) sec1.381.411.451.501.541.591.641.691.741.791.841.901.952.002.062.112.172.222.282.332.392.442.501.341.371.401.441.491.531.581.621.671.721.771.831.881.931.982.032.092.142.192.252.302.362.411.291.321.351.391.431.471.521.561.611.661.701.751.801.851.901.962.012.062.112.162.212.272.32Time1.421.461.501.541.591.641.691.741.801.851.901.962.012.072.122.182.242.292.352.402.462.522.5820Px: Regular Circuit Pressure (MPa · abs)Ａ＝１０.１９７２×Ｂ×Ｐ０－Ｃ× １－Ｂ＝｛ ４８８－ ２０６５×１０２－（Ｔ０－１７０）２ ｝／１０４Ｃ＝｛ ８２３３－ ６７９４×１０４－（Ｔ０－６９６）２ ｝／１０２Ｐ1＝｛ Ａ×（Ｔ１－Ｔ０）＋Ｐ０×１０.１９７２ ｝／１０.１９７２・At the maximum working temperature, gas charging pressure recommended value (range) is as follows.For energy storage .................... 85% (80% to 90%) of P2For pulsation dampening ........... 60% (50% to 80%) of PXFor shock absorbing .................. 60% (50% to 80%) of PX・Bladder Compression RatioIf the bladder compression ratio is larger than 4, the bladder life will be shortened.Bladder Compression Ratio b (P3 / P1) ≤4 (when vertical)In case of using J series, 145 to 175L of A/H/N series or 40, 60, 80, 120 L of H/N/Y series accumulator whose outer diameter of its body is 355.6 mm, allowable compression ratio may be smaller than 4 depending on usage conditions.Please contact us if the accumulator is used under the following conditions. ・J series, 145 to 175L of A/H/N series : Bladder Compression Ratio b is more than 3. ・40, 60, 80, 120 L of H/N/Y series accumulator whose outer diameter of its shell is 355.6 mm: The Bladder Compression Ratio b is more than 3.5.・For energy storage calculation, taking temperature change into account, use Gas Charging Pressure of minimum working temperature at the time (Min. P1).Gas Charging Pressure of minimum working temperature is determined by the following equation. (See page 22, Volume calculation example)・Gas pressure will vary with changes in temperature.The gas pressure at the time of charging, adjusted to match the room temperature, is obtained by the following equation.・Formula for gas charging pressure actual change due to temperature changeA polytropic exponent can be calculated by an average pressure (Pa) or a regular circuit pressure (Px) and an oil charge/discharge time from the polytropic exponent list. Use m as the polytropic exponent at charge time, and n as the polytropic exponent at discharge time. In addition, a polytropic exponent can be obtained by calculation.1.241.271.301.331.371.411.451.501.541.591.631.681.731.781.831.871.921.972.022.072.122.182.231.191.221.241.271.311.351.391.431.471.511.561.601.651.701.741.791.841.891.931.982.032.082.131.151.161.191.221.251.281.321.361.401.441.481.531.571.611.661.701.751.791.841.891.931.982.031.101.111.131.161.191.221.261.291.331.371.411.451.491.531.581.621.661.711.751.791.841.881.931.051.061.071.101.121.151.181.221.251.291.321.361.401.441.481.521.561.601.641.681.721.761.81
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