• Wood Chippers (Tritone Range) - Approved Hydraulics Limited

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    Wood Chippers (Tritone Range)

    Key Features

    • Range: tritone wood chippers
    • Drive options: tractor pto ; petrol engine variants
    • Cutting system: disc ; hammer depending on model
    • Typical capacity: small to medium branches
    • Use: landscaping ; grounds maintenance

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    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Z50 3/8" Solenoid Control Valves 50LPM 12/24VDC - Approved Hydraulics Limited
    Regular price From £159.47
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    Z50 3/8" Solenoid Control Valves 50LPM 12/24VDC

    Key Features

    • Valve type: solenoid operated monoblock
    • Nominal flow: 50 lpm
    • Port size: 3/8" bsp
    • Coils: 12 vdc ; 24 vdc
    • Sections: up to 6 sections
    • Options: hp carry over ; spool kits
    Regular price From £159.47
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Z50 Motor Spool - Approved Hydraulics Limited

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    Z50 Motor Spool

    Key Features

    • Type: z50 motor spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

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    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Out of Stock
    Z50 Single Acting Spool

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    Z50 Single Acting Spool

    Key Features

    • Type: z50 single acting spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

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    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Adam Hindle

    Sales Director

    I began my engineering career at Stockport College in around 2005, first completing a National Diploma in Electrical Engineering, followed by a Higher National Diploma in Mechanical Engineering. I then progressed to the University of Salford, where I earned a BEng (Hons) degree in Mechanical Engineering.

    After graduating, I started my professional career with Approved Hydraulics. I initially gained a combination of hands-on workshop experience and telephone-based sales experience. In later years, I moved into a full-time sales role and led the new crane and excavator attachments department that the company had recently established.

  • Z80 1/2" Solenoid Control Valves 80LPM 12/24VDC - Approved Hydraulics Limited
    Regular price From £207.30
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    • Delivery to UK & Ireland

    Z80 1/2" Solenoid Control Valves 80LPM 12/24VDC

    Key Features

    • Port size: 1/2\" bsp
    • Nominal flow: 80 lpm
    • Supply voltage: 12 vdc ; 24 vdc
    • Configuration: direct acting solenoid control ; monoblock
    • Banks: up to 6 sections
    • Carry over: high pressure carry over option
    Regular price From £207.30
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Z80 Motor Spool - Approved Hydraulics Limited

    POA

    • All Items Guaranteed
    • Delivery to UK & Ireland

    Z80 Motor Spool

    Key Features

    • Type: z80 motor spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Z80 Single Acting Spool

    POA

    • All Items Guaranteed
    • Delivery to UK & Ireland

    Z80 Single Acting Spool

    Key Features

    • Type: z80 single acting spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice

All

Common Calculations FAQs

Calculating force, speed, pressure, power, and efficiency in hydraulic applications.

How do you calculate actuator speed?

Actuator speed is determined by flow rate and cross-sectional area:

Speed = Flow rate ÷ Area

Flow rate is the volume of fluid delivered (in L/min or GPM).

Area is the cross-sectional area of the actuator piston: π × (diameter ÷ 2)².

How do you calculate cylinder force?

Cylinder force can be calculated using:

Force = Pressure × Area

Pressure is the system pressure (in psi or bar).

Area is the cross-sectional area of the cylinder bore (in square inches or square centimeters).

Area = π × (bore diameter ÷ 2)².

How do you calculate pressure drop across a valve?

Pressure drop can be calculated using the valve flow coefficient (Cv):

Pressure Drop (ΔP) = (Flow Rate)² ÷ (Cv² × Fluid Density)

Flow Rate is the fluid flow (in GPM or L/min).

Cv is the valve flow coefficient.

Fluid Density is the density of the hydraulic fluid.

How do you size an accumulator?

Accumulator sizing considers required flow, pressure, and pre-charge:

Accumulator Volume = Flow Rate × Time ÷ Pressure

This determines how much fluid must be stored to maintain system pressure.

How to convert psi to bar?

Use the conversion factor: 1 bar = 14.5 psi.

To convert psi to bar, divide psi by 14.5.

Example: 200 psi ÷ 14.5 = 13.79 bar.

What is pre-charge pressure in an accumulator?

Pre-charge pressure is the initial gas pressure in the accumulator before fluid enters.

It helps maintain system pressure as the accumulator discharges.

Typically set to 70–80% of system operating pressure.

What is specific gravity of hydraulic fluid?

Specific gravity is the ratio of hydraulic fluid density to water.

A value of 1 means equal density.

Less than 1 means the fluid floats; greater than 1 means it sinks.

What is torque in a hydraulic motor?

Torque is the rotational force produced based on system pressure and motor displacement:

Torque = Pressure × Displacement ÷ 2π

Pressure is the operating system pressure.

Displacement is the volume displaced per revolution (in cubic inches or cubic centimeters).

What unit is hydraulic power measured in?

Hydraulic power is measured in horsepower (HP) or kilowatts (kW).

Hydraulic horsepower can be calculated using:

HP = (Pressure (psi) × Flow rate (GPM)) ÷ 1714.

What’s the relationship between pump speed and flow?

Flow rate is directly proportional to pump speed.

If pump speed doubles, flow rate doubles (assuming constant displacement).

This is important when adjusting flow or selecting a pump for varying speeds.