Technical-Guidance

Commonly used physical quantities, symbols and units in hydraulics physical quantity notation common unit Area \(A\) \(mm^2\) Shrinkage factor \(C_c\) Flow rate coefficient \(C_d\) Flow rate coefficient \(C_v\) Diameter \(D、d\) \(mm\) Eccentricity \(e\) \(mm\) Force \(F\) \(kN\) Frequency \(f\) \(H_z\)…

The table below shows commonly used values and unit conversions for hydraulics. To convert hydraulics units in the left column to hydraulics units in the right column, multiply by the conversion factor. To convert hydraulics units in the right column…

Hydraulic common calculation formula symbolic form SL units common unit pump \(P=\frac{pq_v100}{\eta_0} \) \(W=\frac{P_a\times(m^3/s)\times100}{\eta_0} \) \(kW=\frac{Mpa \times (L/min) \times 100}{60_{\eta 0}} \) \(V=\frac{q_v100}{n\eta_v}  \) \(m^3=\frac{(m^3/s)\times100}{(r/s)\times\eta_v} \) \(mL=\frac{(L/min)\times 10^5}{(r/min)\times \eta _v} \) \(q_v=\frac{_{n}V_{\eta v}}{100} \) \(m^3/s=\frac{(r/s)\times m^3 \times \eta_v}{100} \) \(L/min=\frac{(r/min)\times…

Common materials used for hydraulic valve blocks include hot rolled steel plates, carbon steel forgings and free cutting steel. In addition, grey cast iron castings, ductile iron castings, and aluminium alloy castings are used. Table 3-16 compares these materials. Selection…

International Standard 2-way Cartridge Valve consist of ISO CV 7368 mounting holes and slide-in inserts. They differ from plate-type valve elements in that they have their own circuitry, which is unique to their mounting and assembly in the control valve…

  3D Printing Has Disruptive Impact on Hydraulic Valve Block Processing 3D printing in hydraulics can include hydraulic component parts (see Figure 26-307), hydraulic valve blocks (see Figure 26-308), and sand patterns for hydraulic casting. One of the focuses is…

The control element in an electro-hydraulic proportional control system is an electro-hydraulic proportional valve. It accepts the instruction of the electric signal, and continuously controls the pressure, flow rate and other parameters of the system, so that it changes proportionally…

The pressure p (the physics concept is pressure) is the force per unit area and is related to the size of the load, i.e. p=F/A In the formula: p — Pressure (commonly referred to as stress) (MPa) F — Load…

It is often necessary to punch many holes through the inside of a valve block in order to achieve a certain control function on the block. Some of these holes are intended to allow for easy machining of others and…

In hydraulic drive systems and proportional/servo control systems, you achieve the control of load motion by controlling the fluid flow. Assume that the fluid is incompressible at constant flow, and you can write its Bernoulli equation as follows: Equation (2-3)…