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Hii, Attached picture is a spool in valve assembly. How can we calculate the pressure and flow differences occurring due to the construction of spool.https://files.engineering.com/getfile.aspx?folder=9809617a-a709-4e2d-b569-3b7943000e24&file=sp.JPG

@Brianpetersen. Torque - 2000Nm Leakage - 10 LPM. From bernoulli's equation and pressure drop from restrictor is 0.5 bar. Fluid is has viscosity co-efficient of 32 CSt At present I don't know any simplified method to calculate the pressure drop from mechanical work.Please do share it if you know...

@rb1957 Displacement 1000 CC/rev

@hydtools. You were right. my mistake in interpreting the formula. Actually the solution is From rpm we can calculate the flow as you mentioned. To calculate the flow from the restrictor dimension, we have to find P1 and P2 using bernoulli's equation. Then to find flow I used Poiseuille law...

@hydtools I think it should be Q(CC/min) = Displacement(Cubic centimeter)/ RPM Correct me if I am wrong. I get 50 RPM for inlet pressure of 200 bar. So for 1000cm3 Q should be = 1000/50 = 20 cc/min. After inlet the fluid goes through a reducer pipe of length 7.5mm...

@hydtools What all informations should be measured? Density of oil is about 857 KG/mm3 Volume/ Capacity = 1000 cm3

How can we calculate the flow rate and rpm of a hydraulic vane rotator/motor, if we use a steel restrictor pipe with diameter 4mm length 7.5mm. Pressure of pumped fluid is 250 bar and pressure of fluid at outlet of the motor is 25 bar? Restrictor pipe is installed to both inlet and outlet...

@kiwitom235 Hi Friend, Yes we use crossport valve, but I don't know what's the maximum value. I hope it should between 180 to 250 bar

I have a bundle of steel bars with each bar measuring length about 1.5m. Total weight of bundle is 650kg.If I fasten the steel bar bundle to a hydraulic motor in centre position of the bundle(.75m to each end) and rotate it with 800 Nm of torque.How to calculate the stopping force and stopping...

@EngDesServies, Hii friend, There is no need to be sorry, It happens. But really thank you , yes it does helps.

@cdill21 Hello, Its a Vane motor

@hydtools, Hello Friend, I understand the concept behind 9.9453 But look the answer 3864.68 KW. I am sure this power is not technically possible. Please correct me if I am wrong

@hydtools Hello friend, Thank you so much. As per your formula, RPM = 14/0.33 = 42.42 RPM Stays closer to the practical result of 41 rotations. Do you have any Idea how to find power from the values provided in my question?

@EngDesServices Hello Friend, Thank you so much for your kind reply. But I see some faults in the formula when tested with my model. When I tested the rotator with flow of 14l/min, RPM was 42. So Power (KW)= (900*41)/9.548 = 3864.68 KW = 5178.67 HP. I think the...

What is the formula to calculate Power(Kw) and Rpm of a hydraulic rotator (Vane model) from Torque 900 Nm, Displacement 330cm3, flow rate 14 L/min, volumetric efficiency is 0.9?

What is the formula to calculate the torque of a hydraulic rotator (vane model) with two chambers whose displacement is 330 cm3 and the input pressure is 250 bar? More details: Dimensions that measured can be seen in attachment. Shaft is having Diameter of 80mm Number of vanes = 6 Each vane...