• Oil Level & Temperature Gauge (12mm)
    Regular price £27.96
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    Oil Level & Temperature Gauge (12mm)

    Key Features

    • Type: oil level ; temperature dual gauge
    • Probe: 12 mm mounting stud ; vertical tank installation
    • Scale: dial thermometer ; level mark window
    • Use: monitor reservoir level ; oil temperature
    • Material: aluminium ; polycarbonate sight
    Regular price £27.96
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    Aluminium Hydraulic Female AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 2 Pump - Approved Hydraulics Limited
    Regular price From £294.06
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    Aluminium Hydraulic Female AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 2 Pump

    Key Features

    • Gear ratio: 3 ; 1 PTO speed increase
    • Power rating: 20 kW maximum
    • Input coupling: female quick fit PTO 1 3/8 inch 6T per DIN 9611
    • Pump interface: pre fitted Group 2 gear pump
    • Use case: driving auxiliary hydraulics from tractor PTO circuits
    • Orientation: aluminium housing allows multiple mounting positions
    Regular price From £294.06
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  • Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 2 Pump - Approved Hydraulics Limited
    Regular price £282.06
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    Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 2 Pump

    Key Features

    • Gear ratio: 3 ; 1 speed increase from PTO to pump
    • Power rating: 20 kW max continuous service
    • Input/output: PTO 540 rpm nominal ; gearbox output up to 1620 rpm with limit below 3000 rpm
    • Shafts: male PTO input 1 3/8 inch 6T ; mates to agricultural tractors
    • Pump interface: supplied with Group 2 gear pump pre fitted
    • Housing: aluminium body for reduced weight in mobile applications
    Regular price £282.06
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  • 80L Control Valve Flexible Cable Connector Kit (2 x Ends) - Approved Hydraulics Limited
    Regular price £32.51
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    80L Control Valve Flexible Cable Connector Kit (2 x Ends)

    Key Features

    • Series: 80L GS sectional control valve
    • Interface: remote flexible cable ends ; 2 pcs
    • Use: connects joystick cable to spool input
    • Mounting: replaces lever box on the section
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £32.51
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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.

  • Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 200mm Long - 30mm Dia Ball End - Approved Hydraulics Limited
    Regular price £6.54
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    Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 200mm Long - 30mm Dia Ball End

    Key Features

    • Lever thread: M10
    • Overall length: 200 mm
    • Knob diameter: 30 mm
    • Compatibility: 45L ; 80L ; 90L ; 100L ; 120L ; 150L ; 240L valves
    • Use: manual actuation of lever boxes
    Regular price £6.54
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  • 100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit)  M10x1.5 x 328mm long
    Regular price £24.58
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    100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit) M10x1.5 x 328mm long

    Key Features

    • Kit: tie rods for 5 bank assembly . 4 rods per kit
    • Thread: m10x1.5
    • Rod length: 328 mm
    • Compatibility: 100l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £24.58
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  • 45L & 50L Control Valve Lever Box (Without Lever) (G) - Approved Hydraulics Limited
    Regular price £19.54
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    45L & 50L Control Valve Lever Box (Without Lever) (G)

    Key Features

    • Function: lever pivot box without hand lever
    • Compatibility: 45l ; 50l control valves
    • Interface: accepts m10 threaded lever rod
    • Use: manual actuation of spool ; replace damaged housings
    • Option: stroke limiter versions available separately
    Regular price £19.54
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  • Out of Stock
    90L 100L 120L 150L Control Valve Remote Cable Connection Kit
    Regular price £30.00
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    90L 100L 120L 150L Control Valve Remote Cable Connection Kit

    Key Features

    • Actuation: remote flexible cable control for spool operation
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Interface: lever box ; joystick cable systems
    • Intended use: relocate spool control away from valve for operator ergonomics
    • Notes: kit components may vary ; verify cable length and end fittings per installation
    Regular price £30.00
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  • 90L-100L-120L-150L Control valve  3 Position Detent Kit (11) - Approved Hydraulics Limited
    Regular price £24.08
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    90L-100L-120L-150L Control valve 3 Position Detent Kit (11)

    Key Features

    • Function: 3 position detent ; holds spool in forward and reverse
    • Compatibility: 90L ; 100L ; 120L ; 150L control valves
    • Use: Motor circuits needing maintained actuation or float
    • Install: Replaces end cap hardware on selected spool
    • Additional info: See product data sheet for detailed measurements
    Regular price £24.08
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  • 1" BSP Spy Eye Level Gauge (Clear)
    Regular price £14.10
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    1" BSP Spy Eye Level Gauge (Clear)

    Key Features

    • Type: Threaded sight level gauge for hydraulic tanks
    • Thread: 1" BSP
    • Seal: Supplied with rubber sealing washer
    • Head: Hex head with shoulder for seating
    • Colour: Clear
    • Use: Visual oil level indication at reservoir wall
    Regular price £14.10
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  • JS100 Cable Operated Joystick - Approved Hydraulics Limited
    Regular price £63.94
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    JS100 Cable Operated Joystick

    Key Features

    • Type: Cable operated remote control joystick
    • Model: JS100
    • Control: Single lever ; remote actuation of valve spools
    • Applications: Agricultural loaders ; cutters ; mixers
    • Mounting: Panel mount base with gaiter
    Regular price £63.94
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  • Bearing Support for Group 2 Pump
    Regular price £90.56
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    Bearing Support for Group 2 Pump

    Key Features

    • Pump group: External gear pump ; Group 2
    • Shaft options: Ø18 mm parallel 6 mm key ; Ø22 mm parallel ; 1/8 taper
    • Radial load capacity: ≈318 daN at 1500 rpm
    • Rated lifetime: ≈3500 h at 1500 rpm at rated load
    • Lubrication: Grease to DIN 51502 MPF 1K-20
    • Mounting: Direct flanged between drive and pump ; takes belt or chain side load
    • Typical use: Protects pump bearings in pulley ; sprocket ; belt drives
    Regular price £90.56
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  • 3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors
    Regular price £13.07
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    3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: straight
    • Port: 3/4"
    • Mounting: 3/4 hole on 51 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £13.07
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  • 1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors - Approved Hydraulics Limited
    Regular price £11.39
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    1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £11.39
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  • 3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor
    Regular price £8.22
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    3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: Straight
    Regular price £8.22
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  • 1" Male Female Tipper Quick Release  Coupling (Set) - Approved Hydraulics Limited
    Regular price £59.82
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    1" Quick Release Coupling (Screw Type, Female)

    Key Features

    • Type: screw to connect quick release coupling female
    • Port size: 1"
    • Benefit: high resistance to pressure spikes
    • Use: high pressure attachments ; hammer circuits
    • Standard: screw to connect design
    • Pressure: high impulse rated per series
    Regular price £59.82
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  • CETOP 5 Manifolds - P & T 3/4" - A & B 1/2" - Approved Hydraulics Limited
    Regular price From £85.37
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    CETOP 5 Manifolds - P & T 3/4" - A & B 1/2"

    Key Features

    • Type: cetop 5 ng10 manifold
    • Interface: iso 4401 05 pattern
    • Ports: p ; t 3/4" bsp ; a ; b 1/2" bsp
    • Mounting: 4 hole on industry mm pcd
    • Use: mount ng10 valves to pipework
    Regular price From £85.37
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  • Hydra Part Double Counterbalance Valve 3/4" In Line - 100-350Bar (Aluminium Body) - Approved Hydraulics
    Regular price £215.21
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    Double Counter Balance / Overcentre Valve 3/4" IN LINE Ally Body 100 - 350 bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 3/4"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: aluminium body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £215.21
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  • Group 3 Gear Pumps with 1:8 Taper Shaft (Threaded Ports) - Approved Hydraulics Limited
    Regular price From £273.29
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    Group 3 Gear Pumps with 1:8 Taper Shaft (Threaded Ports)

    Key Features

    • Type: bi rotational external gear pump
    • Group: 3
    • Shaft: 1.8 taper
    • Configuration: single ; double ; triple options
    • Ports: threaded bsp options
    • Construction: cast iron end covers ; aluminium body
    • Applications: mobile hydraulics ; industrial power units
    Regular price From £273.29
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  • Out of Stock
    Hydra Part HP-GP20 Power Take Off Gear Pumps - Approved Hydraulics
    Regular price From £165.53
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    GP20 Power Take Off Gear Pumps

    Key Features

    • Use case: PTO driven hydraulic gear pump for mobile hydraulics; tipping; cranes; auxiliaries
    • Pump type: Hydraulic pump; see title for series and configuration
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price From £165.53
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  • Out of Stock
    Hydra Part Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm - Approved Hydraulics
    Regular price £27.44
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    Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm

    Key Features

    • Application: tractor top link cylinder load holding
    • Type: double pilot operated check
    • Port size: 1/4' bsp
    • Rated flow: 25 to 50 l/min options
    • Use: prevents drift ; allows controlled retraction on pilot
    Regular price £27.44
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  • BSPP Adjustable Compensated Flow Control Valve - Approved Hydraulics Limited
    Regular price From £43.16
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    BSPP Adjustable Compensated Flow Control Valve

    Key Features

    • Type: pressure-compensated adjustable flow control
    • Ports: as specified
    • Function: maintains set flow largely independent of load/pressure
    • Bypass: integrated check for free flow opposite direction
    • Use: stable actuator speed under varying loads
    Regular price From £43.16
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  • Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body - Approved Hydraulics Limited
    Regular price £105.86
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    Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body

    Key Features

    • Type: double acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price £105.86
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £2.80
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    1/4 BSP x 1/4 BSP M/M Ad

    Key Features

    • Type: hydraulic fitting
    • Threads: 1/4 to 1/4 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £2.80
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Shop All Components for Professional Hydraulic Applications

Discover quality shop all components 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. Browse related products including control valves, line mounted valves 1, hydraulic cylinders, hydraulic pumps to find the right solution for your hydraulic system. 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.