• Hydra Part High Visibility Stabiliser Pads - Approved Hydraulics
    Regular price From £30.90
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    High Visibility Stabiliser Pads

    Key Features

    • Material: uhmwpe
    • Colour: high visibility yellow
    • Point load capacity: 4 t to 160 t range
    • Use: stabiliser ; outrigger pad for cranes ; plant
    • Size options: multiple pad sizes available
    Regular price From £30.90
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  • Scanreco Scanreco Battery for Mini and Maxi Transmitters - Approved Hydraulics
    Regular price £160.72
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    Scanreco Battery for Mini and Maxi Transmitters

    Key Features

    • Chemistry: nimh
    • Voltage: 7.2 v nominal
    • Capacity class: ≈2000 mah standard
    • Compatibility: scanreco mini ; maxi transmitter packs
    • Application: hydraulic attachment component
    Regular price £160.72
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  • Hydra Part Hydraulic Oil ISO 46, 20 Litres - Approved Hydraulics
    Regular price £48.05
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    Hydraulic Oil ISO 46, 20 Litres

    Key Features

    • Viscosity grade: iso vg 46
    • Type: anti wear hydraulic oil
    • Additives: anti oxidation ; anti foam ; anti rust
    • Applications: industrial and mobile hydraulic systems
    • Pack size: 20 litres
    Regular price £48.05
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  • Hydra Part Double Acting Cylinder 50mm Bore Rams - Approved Hydraulics
    Regular price From £85.29
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    Double Acting Hydraulic Cylinder 50mm Bore Rams

    Key Features

    • Bore: 50 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £85.29
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  • 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.

  • Hydra Part Double Acting Cylinder 40mm Bore Rams - Approved Hydraulics
    Regular price From £80.33
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    Double Acting Hydraulic Cylinder 40mm Bore Rams

    Key Features

    • Bore: 40 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £80.33
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  • Hydra Part Double Acting Cylinder 60mm Bore Rams - Approved Hydraulics
    Regular price From £91.57
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    Double Acting Hydraulic Cylinder 60mm Bore Rams

    Key Features

    • Bore: 60 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £91.57
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  • Hydra Part Double Acting Cylinder 70mm Bore Rams - Approved Hydraulics
    Regular price From £106.04
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    Double Acting Hydraulic Cylinder 70mm Bore Rams

    Key Features

    • Bore: 70 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £106.04
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  • Hydra Part Hydra Part Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out - Approved Hydraulics
    Regular price £102.32
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    Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out

    Key Features

    • Type: spring centred ; pressure released detent auto return
    • Nominal flow: 80 to 81 l/min
    • Ports: inlet ; outlet 3/4' bsp ; work a ; b 1/2' bsp
    • Function: auto kick out to neutral at end of extend stroke
    • Relief: adjustable system relief integrated
    Regular price £102.32
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  • Hydra Part Side Mounted Steel Hydraulic Oil Tanks With Filter (15L-80L) - Approved Hydraulics
    Regular price From £206.71
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    Side Mounted Steel Hydraulic Oil Tanks With Filter (15L-60L)

    Key Features

    • Construction: 2 mm steel ; robot welded ; pneumatically tested
    • Finish: 2 coat black paint
    • Return filtration: 25 micron return filter included
    • Mounting: side mounted
    • Capacities: 15l-60l
    Regular price From £206.71
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  • Standard 45L Lever Operated Monoblock Valves (3/8"BSP) (1-6 levers) - Approved Hydraulics Limited
    Regular price From £73.39
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    Standard 45L Lever Operated Monoblock Valves (3/8"BSP) (1-6 levers)

    Key Features

    • Ports: 3/8\" bsp p ; a ; b ; t
    • Nominal flow: 45 lpm ; 65 lpm max
    • Max operating pressure: 315 bar
    • Spools: double acting ; spring return to neutral
    • Carry over: hp carry over port optional
    • Banks: 1 to 6 levers
    • Options: single acting ; motor ; float spools ; detents
    Regular price From £73.39
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  • Hydra Part Double Acting Cylinder 32mm Bore Rams - Approved Hydraulics
    Regular price From £69.31
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    Double Acting Hydraulic Cylinder 32mm Bore Rams

    Key Features

    • Bore: 32 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £69.31
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  • Hydra Part Double Acting Cylinder 80mm Bore Rams - Approved Hydraulics
    Regular price From £128.25
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    Double Acting Hydraulic Cylinder 80mm Bore Rams

    Key Features

    • Bore: 80 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £128.25
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  • Hydraulic Motors (MR Series) - Approved Hydraulics Limited
    Regular price From £121.34
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    Hydraulic Motors (MR Series)

    Key Features

    • Series: mr high torque
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    Regular price From £121.34
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  • 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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  • Hydra Part 90º Rotary Swivel Joint - Approved Hydraulics
    Regular price From £26.36
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    90º Rotary Swivel Joint

    Key Features

    • Type: 90 degree rotary swivel joint
    • Installation: between hose and rigid component
    • Function: allows occasional rotation ; reduces hose stress
    • Ports: bsp female sizes
    • Typical applications: hose routing on mobile plant
    Regular price From £26.36
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  • Standard 90L Lever Operated Double Acting Monoblock Valves (1/2"BSP) (1-6 Levers) - Approved Hydraulics Limited
    Regular price From £89.33
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    Standard 90L Lever Operated Double Acting Monoblock Valves (1/2"BSP) (1-6 Levers)

    Key Features

    • Nominal Flow Rating: 90L/Min
    • Max Flow: 100L
    • Max Operating Pressure: 315 Bar - 4600 Psi
    • Specification: Built In Port For The Option Of A High Pressure Carry Over
    • Specification: Pneumatic kits for air operation
    • Ports: 1/2" BSP
    • Levers: 1-6 options
    • Specification: 1/2" Ported Double Acting Monoblock Valves
    • Specification: Built in Adjustable Main Relief Valve
    • Specification: Spring Return To Neutral
    Regular price From £89.33
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  • Hydra Part CETOP 3 Double Solenoid Control Valve NG06, All Ports Blocked - Approved Hydraulics
    Regular price From £63.82
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    CETOP 3 Double Solenoid Control Valve NG06, All Ports Blocked

    Key Features

    • Centre spool: all ports blocked
    • Interface: iso 4401-03 cetop 3 ng06
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £63.82
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  • Hydra Part Flow Regulator Valves with Needle Shut Off - Approved Hydraulics
    Regular price From £31.10
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    Flow Regulator Valves with Needle Shut Off

    Key Features

    • Type: bi directional flow regulator with needle shut off
    • Function: adjust flow ; fully close with needle
    • Ports: bsp sizes
    • Typical sizes: 1/4" ; 3/8" ; 1/2"
    • Use: meter actuator speed both directions
    Regular price From £31.10
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  • Hydra Part Stabiliser Pad Cages - Approved Hydraulics
    Regular price From £132.92
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    Stabiliser Pad Cages (Premium Quality)

    Key Features

    • Size range: 300 x 300 to 800 x 800 mm pads
    • Capacity: stores 2 stabiliser pads
    • Security: padlock ; chain included
    • Use: stowage for stabiliser pads in transit ; onsite
    • Fitment: sized to match pad dimensions
    Regular price From £132.92
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  • Hydra Part Double Acting Cylinder 25mm Bore Rams - Approved Hydraulics
    Regular price From £104.57
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    Double Acting Hydraulic Cylinder 25mm Bore Rams

    Key Features

    • Bore: 25 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £104.57
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    • Order by 3pm for Next Day Delivery
  • Scanreco Scanreco Battery Charger with 10-30vDC Car Adapter - Approved Hydraulics
    Regular price £327.88
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    Scanreco Battery Charger with 10-30vDC Car Adaptor

    Key Features

    • Input: 10-35 vdc vehicle supply
    • Battery type: g2 nimh 7.2 v
    • Compatibility: scanreco mini ; maxi transmitters
    • Mounting: on machine ; rugged
    • Application: hydraulic attachment component
    Regular price £327.88
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  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/4" Bottom Entry - Approved Hydraulics
    Regular price £9.42
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    63mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/4" Bottom Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp bottom entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-6000 psi ( 400 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £9.42
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  • Scanreco Scanreco Quick Battery Charger with 110-230vAC Mains Adapter - Approved Hydraulics
    Regular price £336.42
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    Scanreco Quick Battery Charger with 110-230vAC Mains Adaptor Type 434

    Key Features

    • Input: 110-230 vac mains
    • Charger type: g2 nimh standard type 434 ; 435 family
    • Compatibility: scanreco mini ; maxi transmitters
    • Note: mains adapter included
    • Application: hydraulic attachment component
    Regular price £336.42
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  • Hydra Part 6 Port Solenoid Diverter Valve 3/8" Open Centre 50LPM 12/24vDC - Approved Hydraulics
    Regular price £102.36
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    6 Port Closed Centre Solenoid Diverter Valve 3/8" 50LPM 12vDC/24vDC

    Key Features

    • Type: 6 port 2 position stackable diverter
    • Nominal flow: 50 L/min
    • Max operating pressure: up to 250 bar; 350 bar with drain (typical)
    • Ports: 3/8" BSP
    • Actuation: solenoid 12V or 24V DC
    • Use: add auxiliary circuit from a single control lever
    • Stacking: multiple valves can be used in series
    Regular price £102.36
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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.