• Hydraulic Pilot Control Joystick - 30056363
    Regular price £431.81
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    Hydraulic Pilot Control Joystick - 30056363

    Key Features

    • Type: hydraulic pilot control joystick
    • Actuation: progressive ; low operating force
    • Handles: multiple grip variants ; proportional ; switching
    • Use: operate directional valves ; pumps ; motors
    • Notes: suitable for mobile hydraulic pilot circuits
    Regular price £431.81
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  • 50L Control Valve  Pressure compensated Flow Divider Section Type DFG
    Regular price £423.36
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    50L Control Valve Pressure compensated Flow Divider Section Type DFG

    Key Features

    • Series: 50L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £423.36
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  • Hydra Part WD Worm Drive Kits - Approved Hydraulics Limited
    Regular price From £420.00
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    Hydra Part WD Worm Drive Kits

    Key Features

    • Compatibility: WD7, WD9, WD12, WD17, WD21
    • Included: Worm and all associated components
    Regular price From £420.00
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  • 8 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £414.60
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    8 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 8 on ; off pushbuttons
    • Supply: 12 ; 24 VDC receiver
    • Harness: 2.4 m prewired receiver connection
    • Use case: multiple discrete outputs for valve coils or contactor logic
    • Applications: hydraulic attachment control where simple binary commands are required
    • Note: choose e stop variant where a safety interlock is mandated
    Regular price £414.60
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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.

  • HP50 1/2" Solenoid & Lever Control Valves 50LPM 12/24VDC - Approved Hydraulics Limited
    Regular price From £404.90
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    HP50 1/2" Solenoid & Lever Control Valves 50LPM 12/24VDC

    Key Features

    • Valve type: monoblock ; solenoid + lever control
    • Nominal flow: 50 lpm
    • Coils: 12 vdc ; 24 vdc
    • Sections: up to 6 sections in single housing
    • Spool: double acting standard ; other spools available
    • Options: hp carry over ; valve kits ; connectors
    • Mounting: in line ; direct to system
    Regular price From £404.90
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  • Hydraulic Motors (MV Series) - Approved Hydraulics Limited
    Regular price From £403.48
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    Hydraulic Motors (MV Series)

    Key Features

    • Series: mv 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
    • Features: tapered roller bearings for high radial ; axial loads
    • Displacements: 315 cc to 800 cc
    Regular price From £403.48
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  • Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump - Approved Hydraulics Limited
    Regular price From £403.26
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    Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump

    Key Features

    • Gear ratio: 3 ; 1 step up for pump speed
    • Power rating: 20 kW maximum
    • Input/output: 540 rpm PTO nominal to ~1620 rpm output ; observe 3000 rpm max output guidance
    • Shafts: male PTO 1 3/8 inch 6 spline interface
    • Pump interface: supplied with Group 3 gear pump for higher flow demand
    • Construction: lightweight aluminium gearbox for agricultural PTO duty
    Regular price From £403.26
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  • 6 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £402.76
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    6 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 6 on ; off channels for multi function control
    • Supply: 12 ; 24 VDC receiver input
    • Harness: prewired 2.4 m cable simplifies installation
    • Use case: control of up to three double acting valve sections
    • Applications: service bodies ; cranes ; small plant
    • Operating concept: non proportional on ; off commands for clear operator feedback
    Regular price £402.76
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  • Hydraulic Motors (MT Series) - Approved Hydraulics Limited
    Regular price From £399.03
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    Hydraulic Motors (MT Series)

    Key Features

    • Design: geroler ; shaft distribution flow
    • Mounting: 4 bolt flange
    • Characteristics: smooth operation ; high efficiency ; long life
    • Displacements: multiple options per series
    • Applications: winches ; conveyors ; augers ; slew drives
    Regular price From £399.03
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  • Out of Stock
    MV Hydraulic Motor Mounted Dual Cross Line relief valve 1" Ports - Approved Hydraulics Limited
    Regular price £397.86
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    MV Hydraulic Motor Mounted Dual Cross Line relief valve 1" Ports

    Key Features

    • Mounting: flanged directly to MV ; OMV ; CPMV motor port pattern
    • Port size: 1 in ports on MV variant
    • Setting ranges: 30 to 100 bar ; 50 to 210 bar ; 20 to 250 bar options
    • Max flow: up to 120 l.min
    • Function: dual cross port relief for overpressure ; shock protection
    • Construction: zinc plated steel body ; hardened internal components
    • Seals: NBR Buna N standard
    • Options: anti cavitation check valves available in related families
    Regular price £397.86
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  • Stabiliser Leg Ram Cylinder 70 x 50 x 320 Stroke (Includes PO Check Valve)
    Regular price £396.06
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    Stabiliser Leg Ram Cylinder 70 x 50 x 320 Stroke (Includes PO Check Valve)

    Key Features

    • Bore x rod x stroke: 70 x 50 x 320 mm
    • Integrated valve: Pilot operated check valve for load holding
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Use: Stabiliser legs ; outriggers ; props
    • Temperature range: -25 °C to +80 °C
    Regular price £396.06
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  • Triple Gear Pump - Gp2 17cc - Gp1 3.3+3.3 - 1:8 taper
    Regular price £384.42
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    Triple Gear Pump - Gp2 17cc - Gp1 3.3+3.3 - 1:8 taper

    Key Features

    • Displacement: 17 cc/rev
    • Euro flange with: 1/8 taper shaft
    • Max working pressure: 260 bar
    • Specification: BSP threaded ports
    • Displacement: 3.3 cc/rev
    • Max working pressure: 280 bar
    • Use case: PTO driven hydraulic gear pump for mobile hydraulics; tipping; cranes; auxiliaries
    Regular price £384.42
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  • Aluminium Hydraulic Female Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump - Approved Hydraulics Limited
    Regular price £382.30
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    Aluminium Hydraulic Female Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump

    Key Features

    • Gear ratio: 3 ; 1 speed increase
    • Power rating: 20 kW
    • Input coupling: female quick coupling PTO 1 3/8 inch 6 spline standard
    • Pump interface: supplied with Group 3 gear pump for higher displacement
    • Recommended limits: keep gearbox output below 3000 rpm per common PTO gearbox guidance
    • Construction: aluminium gearbox for low mass on 3 point link implements
    Regular price £382.30
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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise - Approved Hydraulics Limited
    Regular price £372.30
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    Clockwise Group 2 Tandem Pump 14cc Front + 14cc Rear 1:8 taper shaft with Flange Ports

    Key Features

    • Sections: tandem two stage ; 14 cc front ; 14 cc rear
    • Rotation: clockwise
    • Ports: typical suction 3/4" BSP ; pressure 1/2" BSP per stage
    • Shaft: 1.8 taper ; 4 bolt EU flange
    • Working pressures: P1 up to 200 bar ; P2 up to 160 bar
    • Speed: up to ~3500 rpm
    • Use: dual circuit mobile hydraulics ; steering ; implements
    Regular price £372.30
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  • 6 Port Closed Centre Solenoid Diverter Valve 3/4" 120LPM 12vDC/24vDC - Approved Hydraulics Limited
    Regular price £364.21
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    6 Port Closed Centre Solenoid Diverter Valve 3/4" 120LPM 12vDC/24vDC

    Key Features

    • Type: 6 port ; 2 position solenoid diverter ; closed centre
    • Port size: 3/4"
    • Nominal flow: 120 lpm
    • Coils: 12 vdc ; 24 vdc
    • Function: select two circuits ; isolates when de-energised
    • Typical applications: auxiliary circuit selection on mobile plant
    Regular price £364.21
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  • 4 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £355.63
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    4 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 4 on ; off pushbuttons
    • Supply: 12 ; 24 VDC receiver
    • Harness: 2.4 m prewired receiver lead
    • Use case: simple on ; off control of one or two double acting functions
    • Form factor: handheld transmitter with compact receiver
    • Applications: tippers ; winches ; auxiliary hydraulic functions
    Regular price £355.63
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  • Hydra Part 1/2" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £347.56
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    1" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Max Inlet Flow: 200 Lpm
    • Max Adjusted Flow: 170 Lpm
    • Max Pressure: 350 Bar
    • Function: Pressure compensated flow control; regulates actuator speed
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    Regular price £347.56
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  • Out of Stock
    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 2x Double Acting CETOP - 160bar Preset
    Regular price From £337.74
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    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 2x Double Acting CETOP - 160bar Preset

    Key Features

    • Motor: 1.6 kw dc
    • Valving: 2 x double acting cetop stack
    • Starter: solenoid relay included
    • Pressure preset: 160 bar
    • Supply: 12 vdc ; 24 vdc
    • Use: two circuit da operation
    Regular price From £337.74
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  • Out of Stock
    Hydra Part Side Mounted Steel Oil Tanks With Filter (80L-250L) - Approved Hydraulics
    Regular price From £332.20
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    Side Mounted Steel Oil Tanks With Filter (80L-250L)

    Key Features

    • Capacity options: 80 l to 250 l
    • Material: 2 mm steel ; black painted
    • Includes: return filter 25 micron
    • Return filter: 4 different return filter mounting variations.
    • Mounting: side mounted reservoir
    • Testing: pressure tested tank
    Regular price From £332.20
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  • Series 620 Top Link Cylinders - Approved Hydraulics Limited
    Regular price From £331.32
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    Series 620 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link for medium ; large tractors
    • Bore ; rod range: 60/35 mm up to 100/45 mm options
    • Rated pressure: 200 bar typical ; 250 bar max
    • Check valve: Often supplied with double pilot operated check for position holding
    • Supply: Complete with hoses
    • Applications: Implements angle control ; hitch adjustment
    Regular price From £331.32
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  • 2 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £331.19
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    2 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Buttons: 2 on/off
    • Supply: 12 ; 24 vdc
    • Cable: 2.4 m prewired
    • Use: remote control of basic hydraulic functions
    • Application: hydraulic component
    Regular price £331.19
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  • Stabiliser Leg Ram Cylinder Assembly 70 x 50 x 220 Stroke (incl Pilot  Operated Check Valve)
    Regular price £330.06
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    Stabiliser Leg Ram Cylinder Assembly 70 x 50 x 220 Stroke (incl Pilot Operated Check Valve)

    Key Features

    • Bore x rod x stroke: 70 mm ; 50 mm ; 220 mm
    • Actuation: double acting cylinder
    • Mounting: 4 bolt side plate
    • Rod end: foot plate
    • Valve: pilot operated check valve included
    • Application: stabiliser leg / outrigger
    Regular price £330.06
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  • Counter Pressure Pilot Blocks (IT009/IT019) - Approved Hydraulics Limited
    Regular price From £329.99
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    Counter Pressure Pilot Blocks (IT009/IT019)

    Key Features

    • Function: pilot pressure reducing block to feed secondary circuit
    • Flow capacity options: 70 l/min ; 140 l/min
    • Use with: mod10 proportional actuator blocks ; direct to hcd/sd blocks
    • Recommended filtration: 10 micron ; 3-4 l/min pilot flow ; ≤30 bar
    • Connections: 1/2" outlets to distributor ; tank return port
    • Typical applications: scanreco ; remote control ; crane valve pilots
    Regular price From £329.99
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  • 240L Control Valve 1" Left Inlet Section With Direct PRV Type AC (60-315 Bar Max) - Approved Hydraulics Limited
    Regular price £319.81
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    240L Control Valve 1" Left Inlet Section With Direct PRV Type AC (60-315 Bar Max)

    Key Features

    • Valve series: 240 L/min sectional control valve
    • Section: 1" left inlet with direct relief valve ; type AC
    • Relief range: 60 to 315 bar adjustable max
    • Use: Main supply inlet for 240L stacks
    • Compatibility: Hydra Part 240L sectional family
    Regular price £319.81
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Hydra Part

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.