F1: Pump oil discharge coefficient (from the list)V1: Accumulator gas volume(L)1ＰＸＰ11ｎ1ＰＸＰ1ｎ－１ＰｍＰＸｎｎｎ231-3-2 Pulsation Dampening Calculation1-3-3 Shock Absorbing Calculationｑ・Ｆ1・Ｖ1＝ 1－Ｗ・ｖ2・（ｎ－１）･Ｖ1＝ 203.94・ｇ・Ｐｘ・η －1π・ｄ2４Ｗ＝ ・Ｌ・γ・10-6* For gas charging pressure P1, at the maximum working temperature, a value of 60% of Px is recommended. (Adjust the gas charging pressure ratio up to 80% of Px in consideration of the temperature change.)* The maximum allowable pulsation pressure Pm is the maximum pressure that can be tolerated when an accumulator is used, rather than the pressure currently generated.* For polytropic exponent n, use a value that is found at the intersection of less than 15 seconds and Px in the polytropic exponent list.If you use the polytropic exponent formula, use the value of 8 seconds.* Please refer to the volume calculation sheet on page 120.* For gas charging pressure P1, at the maximum working temperature, a value of 60% of Px is recommended. (Adjust the gas charging pressure ratio up to 80% of Px in consideration of the temperature change.)* The maximum allowable shock pressure Pm is the maximum pressure that can be tolerated when an accumulator is used, rather than the pressure currently generated.* For polytropic exponent n, use a value that is found at the intersection of less than 15 seconds and Px in the polytropic exponent list.If you use the polytropic exponent formula, use the value of 8 seconds.* Please refer to the volume calculation sheet on page 121.q: Oil discharge volume per pump revolution (L/rev)Pump Oil Discharge Coefficient (F1) List * For a pump larger than triplex, vane pump, or gear W: Weight of fluid in the line(kg)v: Flow velocity(m/sec)g: Acceleration of gravity 9.8(m/sec2)d: Pipe bore(mm)L: Total pipe length(m)γ: Weight volume ratio of the fluid(kg/m3)Px: Regular circuit pressure(MPa∙abs)V1: Accumulator gas volume (L)Px: Regular circuit pressure (MPa∙abs)Pm: Maximum allowable pulsation pressure (MPa∙abs)Pm : Maximum allowable shock pressure(MPa∙abs)SimplexDuplexTriplexpump, use 0.06 for F.Pump TypePump Oil Discharge Coefficient F10.60 0.25 0.25 0.15 0.13 0.06 Single ActionDouble ActionSingle ActionDouble ActionSingle ActionDouble ActionＰＸＰｍ
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