• DIN 3/8" BSPP Double Acting Pilot Check Valve With Adjustable Banjo 12mm - Approved Hydraulics Limited
    Regular price £38.34
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    DIN 3/8" BSPP Double Acting Pilot Check Valve With Adjustable Banjo 12mm

    Key Features

    • Type: double acting pilot operated check valve with adjustable banjo
    • Ports: 3/8 BSPP
    • Function: locks actuator in both directions until pilot pressure opens
    • Benefit: load holding with controlled release
    • Use: cylinders that must hold position under load
    Regular price £38.34
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  • Din Connector plug 3 Pole + Earth - IP65 - Max 240 VAC - 10A - Approved Hydraulics Limited
    Regular price £3.19
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    Din Connector plug 3 Pole + Earth - IP65 - Max 240 VAC - 10A

    Key Features

    • Standard: DIN 43650 Form A ; ISO 4400
    • Contacts: 3 pole + earth PE
    • Rating: 250 VAC ; 10 A max
    • Ingress protection: IP65 with gasket ; strain relief
    • Use: fits solenoid coils with 18 mm pin spacing ; DIN Form A
    Regular price £3.19
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  • Femac DOC 101 Side Arm Flail (1-2.5T Tractors) - Approved Hydraulics

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    DOC 101 Side Arm Flail (1-2.5T Tractors)

    Key Features

    • Reach: 3.0 m side arm
    • Tractor class: 20-40 hp ; 1-2.5 t
    • Hydraulic system: independent 60 l tank; double gear pump 40+15 l/min
    • Head: T3 90 flail; direct transmission
    • Rotor speed: ≈3000 rpm
    • Safety: mechanical release; self-levelling floating head
    • Head angle: 200° rotation

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  • Femac DOC 201 Side Arm Flail (2-2.5T Tractors) - Approved Hydraulics

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    DOC 201 Side Arm Flail (2-2.5T Tractors)

    Key Features

    • Tractor class: 50-80 hp ; 2-2.5 t
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: 20.2 TTD 105 flail; direct drive
    • Controls: remote cables standard; proportional option
    • Cooling option: add-on heat exchanger available
    • Other options: 70 cm ; 90 cm heads ; tie rod adaptors cat 1 ; cat 2

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  • Team Member

    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.

  • Femac DOC 202 Side Arm Flail (2.4-2.8T Tractors) - Approved Hydraulics

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    DOC 202 Side Arm Flail (2.4-2.8T Tractors)

    Key Features

    • Tractor class: 50-70 hp ; 2.4-2.8 t
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: 20.2 TTD 105 flail; direct transmission
    • Rotation: 90° head rotation; shock resistant safety
    • Controls: on-off electric or fully proportional optional
    • Cooling option: additional heat exchanger available

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  • Femac DOC 302 Side Arm Flail (3.5-4.5T Tractors) - Approved Hydraulics

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    DOC 302 Side Arm Flail (3.5-4.5T Tractors)

    Key Features

    • Tractor class: ≈60-80 hp; 3.5-4.5 t
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: 20.2 TTD 105 flail; direct drive
    • Safety: shock resistant hydraulic device
    • Controls: remote cables ; on-off electric ; proportional options
    • Cooling option: heat exchanger add-on

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  • Femac DOC 303 Side Arm Flail (3.0-3.5T Tractors) - Approved Hydraulics

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    DOC 303 Side Arm Flail (3.0-3.5T Tractors)

    Key Features

    • Tractor class: ≈60-90 hp; 3.0-3.5 t
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: 105 cm flail; direct drive
    • Rotation: head rotation up to 90°
    • Controls: cable ; on-off electric ; proportional options
    • Cooling option: heat exchanger add-on

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  • Femac DOC 400 Side Arm Flail (4.5-5.0T Tractors) - Approved Hydraulics

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    DOC 400 Side Arm Flail (4.5-5.0T Tractors)

    Key Features

    • Tractor class: ≈80-100 hp; 4.5-5.0 t
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: 105 cm flail; direct drive
    • Safety: shock resistant system; floating head
    • Controls: cable ; on-off electric ; proportional
    • Cooling option: heat exchanger add-on

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  • Femac DOC 500 Side Arm Flail (6.5T Tractors) - Approved Hydraulics

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    DOC 500 Side Arm Flail (6.5T Tractors)

    Key Features

    • Tractor class: ≈100-140 hp ; ~6.5 t
    • Side arm reach: long-reach verge mowing
    • Head: heavy 105 cm flail; direct drive
    • Controls: on-off electric ; fully proportional options
    • Cooling: heat exchanger option for continuous duty
    • Protection: shock resistant head safety ; floating

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  • Femac DOC 600 Side Arm Flail (7.0T Tractors) - Approved Hydraulics

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    DOC 600 Side Arm Flail (7.0T Tractors)

    Key Features

    • Tractor class: ≈120-160 hp ; ~7.0 t
    • Side arm: heavy-duty verge flail system
    • Head: 105 cm class; helical rotor; hammers
    • Controls: remote cable ; on-off electric ; proportional
    • Cooling: optional oil cooler
    • Hydraulics: independent pump ; tank package

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  • Femac DOC302P Side Arm Flail(3.5-4.5T Tractors) - Approved Hydraulics

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    DOC302P Side Arm Flail(3.5-4.5T Tractors)

    Key Features

    • Tractor class: ≈70-90 hp; mid-heavy spec
    • Side arm length options: 4.3 m ; 5.0 m
    • Head: suitable flail head 105 cm class ; direct drive
    • Safety: shock resistant device ; self-levelling
    • Controls: on-off electric ; fully proportional options
    • Cooling option: heat exchanger add-on

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  • Scanreco Don't Forget Me Device For RC400 Transmitter - Approved Hydraulics
    Regular price £327.82
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    Don't Forget Me Device For RC400 Transmitter

    Key Features

    • Type: transmitter reminder accessory
    • Function: helps prevent leaving transmitter behind
    • Compatibility: RC400 Mini ; Maxi families
    • Attachment: fits to strap or holster
    • Use: operator safety ; asset retention
    Regular price £327.82
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  • Donaldson Hydraulic Return Filter Cartridge 25 Micron - Approved Hydraulics Limited
    Regular price £22.09
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    Donaldson Hydraulic Return Filter Cartridge 25 Micron

    Key Features

    • Type: hydraulic return filter element
    • Rating: 25 micron filtration class
    • Media: cellulose or synthetic media options
    • Use: protect system from contamination on return line
    • Compatibility: fits designated filter head family
    Regular price £22.09
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  • Dorfmeister WSF650 Stump Grinder

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    Dorfmeister WSF650 Stump Grinder

    Key Features

    • Disc diameters: 650 mm ; 850 mm options
    • Disc thickness: 30 mm
    • Recommended excavator: 5-15 t range
    • Drive: axial piston motor via belt transmission
    • Use: stump removal ; landscaping ; forestry
    • Features: replaceable tungsten carbide teeth

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  • Hydra Part Double Acting Cylinder 100mm Bore Rams - Approved Hydraulics
    Regular price From £219.25
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    Double Acting Hydraulic Cylinder 100mm Bore Rams

    Key Features

    • Bore: 100 mm
    • Rod: 50 mm
    • Ports: 1/2' bsp
    • Max pressure: 250 bar
    • Speed: 0.5 m/s max
    • Temp range: -25 c to +80 c
    • Mounting: fixed pin holes 30 mm approx
    Regular price From £219.25
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  • Hydra Part Double Acting Cylinder 25mm Bore Rams - Approved Hydraulics
    Regular price From £109.80
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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 £109.80
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  • Hydra Part Double Acting Cylinder 32mm Bore Rams - Approved Hydraulics
    Regular price From £72.78
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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 £72.78
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  • Hydra Part Double Acting Cylinder 40mm Bore Rams - Approved Hydraulics
    Regular price From £84.35
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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 £84.35
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  • Hydra Part Double Acting Cylinder 50mm Bore Rams - Approved Hydraulics
    Regular price From £89.57
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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 £89.57
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  • Hydra Part Double Acting Cylinder 60mm Bore Rams - Approved Hydraulics
    Regular price From £96.16
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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 £96.16
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  • Hydra Part Double Acting Cylinder 70mm Bore Rams - Approved Hydraulics
    Regular price From £111.35
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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 £111.35
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  • Hydra Part Double Acting Cylinder 80mm Bore Rams - Approved Hydraulics
    Regular price From £134.66
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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 £134.66
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  • Hydra Part Double Acting Cylinder 70mm Bore Rams - Approved Hydraulics
    Regular price From £172.99
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    Double Acting Hydraulic Cylinder 90mm Bore Rams

    Key Features

    • Bore: 90 mm
    • Rod: 50 mm
    • Pin hole: 30 mm
    • Max working pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Type: Double acting welded cylinder for mobile hydraulics
    Regular price From £172.99
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  • Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 1x Double Acting CETOP - 160bar Preset - Approved Hydraulics Limited
    Regular price From £272.21
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    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 1x Double Acting CETOP - 160bar Preset

    Key Features

    • Circuit: 1x double acting cetop
    • Motor: 1.6 kw
    • Pressure: 160 bar preset
    • Supply: 12 vdc ; 24 vdc
    • Notes: built to order
    Regular price From £272.21
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All for Professional Hydraulic Applications

Discover quality all from Approved Hydraulics, trusted by professionals across construction, transport, forestry, agriculture and industrial sectors. Built for demanding working environments, our range offers dependable performance, durable construction and trusted reliability. Whether you are replacing existing parts or specifying components for a new build, our experienced team can help you find the right product. With fast UK delivery and expert technical support, Approved Hydraulics supplies hydraulic equipment you can rely on.

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.