FluidPower.Pro – Page 9 – Hydraulic and pneumatic professionals

Fluid Power Books

Dzyanis May 2, 2018 0 Articles books 903 Views

By this link you anybody can download (or just read online) quick reference book with formulas from Bosch Rexroth.

By this link anybody can free download (or just read online) first couple chapters of “Fluid Power Basics” by Alan Hitchcox. This handbook is really just a basics and probably will be good enough for beginners. Unfortunately, full book is available for $59. But you always can read previous edition (from 2007) online by this link.

By clicking this link you can download very well illustrated eBook about pneumatic system design from Automation Direct. And it is really good book for beginners.

Here is a free eBook what I tried to use for proportional valve calculations. In the reality this book was not useful enough, but you can read it at least because it free for download. The book contains a lot of ads at the pages, so, probably, this is the reason why it free.

Very basics book for beginners from Yuken.

Hydraulic tank volume

Dzyanis March 12, 2018 0 Articles tank 1994 Views

The main rule for hydraulic tank sizing is: “bigger is better”, but because there is not always exist a possibility to find a lot of space for the tank (mostly in mobile applications) we need to know and follow min requirements for system calculation.

Just wanted to summarize all info I have for estimation of hydraulic tank volume:

Min. value	Recommendation
Industrial application – Mineral Oil
2.5 times of all pumps flow + 10% for air cushion	3..5 times of all pumps flow + 10% for air cushion
Industrial application – HFC/HFD
5 times of all pumps flow + 10% for air cushion	8 times of all pumps flow + 10% for air cushion
Mobile application – Open loop pumps
1.5..2 times of all pumps flow + 10% for air cushion	2.5 times of all pumps flow + 10% for air cushion
Mobile application – Close loop pumps
1..2 times of all CHARGE pumps flow + 10% for air cushion	1.5..2 times of all pumps flow + 10% for air cushion

Please correct me if I’m wrong.

Pump-Motor calculation

Dzyanis January 30, 2018 1 Calculators close loop, motor, pump 1017 Views

Pump-Motor calculations

Here you can find the online calculations for Pump-Motor in close loop.
These calculations are for variable displacement pump and fixed displacement motor.

Conduit calculations (pressure losses, velocity)

Dzyanis October 15, 2017 0 Calculators hose, losses, pipe, pressure drop 809 Views

Pressure losses in the conduit

These calculations can help you to estimate the pressure losses, and flow velocity in the conduit (hose, pipe or tube) and check/correct conduit ID.

Calculations Notes:

The recommended flow velocity in conduits you can find at the article Recommended flow velocity.
The assumption: pressure losses on elbows, fittings at calculated conduit is zero.
Height difference between IN and OUT points needs to calculate hydrostatic pressure what will be added to pressure losses, if IN point is below OUT (use positive value), or subtracted from pressure losses, if IN point is upper than OUT (use negative value). Use value “0” if height difference can be neglected.
To find Darcy friction factor there are different formulas used:
- Darcy equation – for laminar flow.
- Churchill’s all-regime (1977) – the best approximation what I found for critical and transient flow.
- Haaland’s approximation (1983) to the Colebrook–White relation – for turbulent flow.