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Common formulae for hydraulic calculations

(Summary description)Common formulae for hydraulic calculations

Common formulae for hydraulic calculations

(Summary description)Common formulae for hydraulic calculations

Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item Item
.
Metric formula
.
Symbol Meaning
.
  Hydraulic cylinder area (cm2)   A =πD2   D：Hydraulic cylinder effective piston diameter (cm)
  Hydraulic cylinder speed (m/min)   V = Q / A   Q: Flow rate (l / min)
  The flow rate required by the hydraulic cylinder (l/min)   Q=V×A/10=A×S/10t   V: Speed (m/min)
.   S：Hydraulic cylinder stroke (m)
The hydraulic cylinder stroke (m)
is the same as the above.   t: time(min)
  Hydraulic cylinder force (kgf)   F = p × A
.   F = (p × A)-(p ×A)
  (When there is back pressure present)		   p : pressure (kgf /cm2)
  Pump or motor flow (l/min)   Q = q × n / 1000   q: Geometric displacement of the pump or motor (cc/rev)
.   n: Speed (rpm)
  Pump or motor rotation speed (rpm)   n = Q / q ×1000   Q: Flow rate (l / min)
  Pump or motor torque (N.m)   T = q × p / 20π  
  Hydraulic power required (kw)   P = Q × p / 612  
  Tube flow rate (m/s)   v = Q ×21.22 / d2   d：tube inner diameter (mm)
  Tube pressure drop (kgf/cm2)   △P=0.000698×USLQ/d4   U: viscosity of oil (cst)
.   S: specific gravity of oil
  L：The length of the tube (m)
  Q：Flow rate (l/min)
  d：The inner diameter of the tube (cm)

 

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