• 24V - 150AMP Starter + Cables and Copper Bar (Kit) - Approved Hydraulics Limited
    Regular price £26.81
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    24V - 150AMP Starter + Cables and Copper Bar (Kit)

    Key Features

    • System voltage: 24 vdc
    • Current class: 150 a
    • Kit contents: starter cables ; copper bar
    • Use: dc power pack motor relay ; battery link
    • Compatibility: mini power packs ; vehicle auxiliary systems
    Regular price £26.81
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  • 24v Coil for MOD09 Hydraulic Actuator - Approved Hydraulics Limited
    Regular price £67.61
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    24v Coil for MOD09 Hydraulic Actuator

    Key Features

    • Type: proportional coil for MOD09 hydraulic actuator
    • Supply: 24 vdc
    • Fit: 19 mm bore ; 50 mm length core tube
    • Connector: DIN 43650 interface
    • Use: drive proportional servo module operation
    Regular price £67.61
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  • 24V DC Coil-22W-13mm hole-39mm long for  45 - 50L - 80L-90L-100L-150L Unloader Valve - Approved Hydraulics Limited
    Regular price £26.11
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    24V DC Coil-22W-13mm hole-39mm long for 45 - 50L - 80L-90L-100L-150L Unloader Valve

    Key Features

    • Voltage: 24 vdc
    • Power: 22 w
    • Bore: 13 mm through-hole
    • Body length: 39 mm
    • Duty: 100% ed
    • Use: unloader valve actuation
    Regular price £26.11
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  • 24V Elec/Air Solenoid for 8EP3 -4 kit  4.8W IP65 100% ED - Coil 9mm Hole x 30mm long - Approved Hydraulics Limited
    Regular price £10.03
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    24V Elec/Air Solenoid for 8EP3 -4 kit 4.8W IP65 100% ED - Coil 9mm Hole x 30mm long

    Key Features

    • Voltage: 24 vdc
    • Power: 4.8 w
    • Protection: ip65
    • Duty cycle: 100% ed
    • Core tube fit: 9 mm bore ; 30 mm length
    • Application: 8ep3 ; 8ep4 electro pneumatic kits
    Regular price £10.03
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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.

  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 24 vdc
    • Power: 37 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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  • 24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
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    24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 24 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A
    • Insulation class: Class H typical for DC coils
    • Protection: IP65 with gasketed DIN plug
    Regular price £124.93
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  • 24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long
    Regular price £24.68
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    24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long

    Key Features

    • Voltage: 24 vdc
    • Bore: 16.3 mm
    • Length: 50 mm
    • Use: z50 sectional valve coil
    • Connector: din plug
    Regular price £24.68
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  • 24VDC Coil For Z80 Valve 22mm Hole x 54mm Long - Approved Hydraulics Limited
    Regular price £34.88
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    24VDC Coil For Z80 Valve 22mm Hole x 54mm Long

    Key Features

    • Voltage: 24 vdc
    • Bore: 22 mm
    • Length: 54 mm
    • Use: z80 sectional valve coils
    • Connector: din plug
    Regular price £34.88
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  • 24VDC Proportional Solenoid PWM For Scanreco Mod10  Actuator Valve 14mm Dia Hole x 39mm Long
    Regular price £73.39
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    24VDC Proportional Solenoid PWM For Scanreco Mod10 Actuator Valve 14mm Dia Hole x 39mm Long

    Key Features

    • Voltage: 24 vdc
    • Control: pwm proportional
    • For: scanreco mod10 actuator valve
    • Core size: 14 mm id x 39 mm long
    • Application: hydraulic attachment component
    Regular price £73.39
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  • Hydra Part 25cc Single acting manual hand pump - Approved Hydraulics
    Regular price £78.40
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    25cc Single Acting Manual Hand Pump

    Key Features

    • Displacement: 25 cc per stroke
    • Function: single acting manual hand pump
    • Rated pressure: 250 bar
    • Reservoir compatibility: 1 l ; 3 l ; 5 l steel tanks
    • Mounting: flanged fixing to oil tank
    • Typical applications: actuating single acting cylinders ; emergency circuits
    Regular price £78.40
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  • 25mm Straight Keyed Shaft For MP & MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £32.44
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    25mm Straight Keyed Shaft For MP & MR Motors (ZHE)

    Key Features

    • Shaft diameter: 25 mm
    • Key standard: DIN 6885 parallel key
    • Key size: 8 x 7 mm typical for 25 mm shaft
    • Compatibility: M+S MP ; MR orbital motor shaft interface
    • Material: steel ; ground finish on bearing ; seal lands
    • Use: replacement straight keyed shaft ; service part
    Regular price £32.44
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  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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    25mm Straight Keyed Shaft For MR Motors (Zi)

    Key Features

    • Interface: 25 mm straight keyed shaft
    • Compatibility: MR series hydraulic motors
    • Keyway: parallel key for positive torque transfer
    • Use: couples motor output to hubs; pulleys; couplings
    • Material: alloy steel for durability
    Regular price £38.16
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  • 28 Bar Servo pressure reducer for IT128 blocks
    Regular price £164.69
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    28 Bar Servo pressure reducer for IT128 blocks

    Key Features

    • Type: servo pressure reducer for IT128 blocks
    • Set pressure: 28 bar class
    • Porting: internal pilot gallery with dedicated ports
    • Function: regulates pilot pressure to servo controlled valves
    • Use: stable proportional control in IT128 retrofit systems
    Regular price £164.69
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  • 3 kW Drive Coupling - Approved Hydraulics Limited
    Regular price £3.45
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    3 kW Drive Coupling

    Key Features

    • Power rating: 3 kw
    • Role: elastic drive element for motor ; pump coupling
    • Use: b14 mounting kits ; compact power units
    • Compatibility: group 1 pump semi couplings
    • Function: damp torsional vibration ; align drive
    Regular price £3.45
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  • Hydra Part 3 Port Solenoid Diverter Valve 1/2" 12/24vDC - Approved Hydraulics
    Regular price From £96.49
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    3 Port Closed Centre Solenoid Diverter Valve 1/2" 80LPM 12/24vDC

    Key Features

    • Type: 3 port 2 position diverter valve
    • Ports: 1/2" BSP
    • Actuation: solenoid 12V or 24V DC
    • Function: redirects flow between two circuits in closed centre systems
    • Mounting: line mounted body
    • Brand: Hydra Part; data sheet available
    Regular price From £96.49
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  • Hydra Part 3 Port Solenoid Diverter Valve 3/8" 12/24vDC - Approved Hydraulics
    Regular price £103.64
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    3 Port Closed Centre Solenoid Diverter Valve 3/8" 80LPM 12/24vDC

    Key Features

    • Type: 3 port 2 position diverter valve
    • Ports: 3/8" BSP
    • Actuation: solenoid 12V or 24V DC
    • Function: redirects flow between two circuits in closed centre systems
    • Mounting: line mounted body
    • Brand: Hydra Part; data sheet available
    Regular price £103.64
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  • 3 Position Detent Kits Type SC4 For AK50 Control Valve - Approved Hydraulics Limited
    Regular price £13.14
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    3 Position Detent Kits Type SC4 For AK50 Control Valve

    Key Features

    • Part number: 2000363000
    • Compatibility: AK50 control valve
    • Detent type: SC4 detent mechanism
    • Positions: 3 position detent
    • Function: Holds spool in selected position for continuous operation
    • Typical use: Directional control where lever must stay engaged
    Regular price £13.14
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  • Hydra Part 3 Way High Pressure Ball Valves - Approved Hydraulics
    Regular price From £54.58
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    3 Way High Pressure Ball Valves

    Key Features

    • Type: 3 way high pressure ball valve
    • Body: zinc plated steel
    • Seals: buna n ; pom
    • Function: diverts inlet to port a or b by lever selection
    • Typical ports: bsp thread options
    Regular price From £54.58
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  • Out of Stock
    3 WAY PRIORITY VALVE - EXCESS TO LINE 3/4"
    Regular price £159.00
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    3 WAY PRIORITY VALVE - EXCESS TO LINE 3/4"

    Key Features

    • Ports: G 3/4 BSPP
    • Function: 3 way priority flow control ; excess to S line
    • Max inlet flow: 150 l.min
    • Max regulated flow: up to 90 l.min adjustment range
    • Max pressure: 260 bar
    • Body: aluminium body ; hardened internal parts
    • Adjustment: twin handknob ; lockable
    • Typical use: steering priority ; auxiliary circuits from single pump
    Regular price £159.00
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  • Out of Stock
    3 WAYS Manual Diverter Valve 3/4'', 120 l/min
    Regular price £111.53
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    3 WAYS Manual Diverter Valve 3/4'', 120 l/min

    Key Features

    • Type: 3-way manual diverter valve
    • Port size: 3/4'' BSP
    • Max flow: 120 l/min
    • Pressure class: up to 350 bar (family rating)
    • Ports: P to pressure; A/B to circuit outlets
    • Operation: lever-actuated; mechanical detents
    • Use: high-flow circuit selection for truck hydraulics
    Regular price £111.53
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  • 3 Ways Manual Diverter Valve 3/8", 60 l/min
    Regular price £65.57
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    3 Ways Manual Diverter Valve 3/8", 60 l/min

    Key Features

    • Type: 3-way manual diverter valve
    • Port size: 3/8" BSP
    • Max flow: 60 l/min
    • Pressure class: up to 350 bar (family rating)
    • Ports: P to pressure; A/B to circuit outlets
    • Operation: lever-actuated; mechanical detents
    • Use: direct flow to one of two outlets in mobile hydraulics
    Regular price £65.57
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  • 1/2" BSP Coned Blanking Plug - Approved Hydraulics Limited
    Regular price £10.09
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    3/" BSP Coned Blanking Plug

    Key Features

    • Type: 60° coned seat blanking plug
    • Thread: BSP
    • Seal: metal-to-metal cone sealing
    • Material: plated steel for high pressure service
    • Use: blank unused ports safely
    Regular price £10.09
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  • 3/4 Bonded seal - Approved Hydraulics Limited
    Regular price £1.50
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    3/4 Bonded seal

    Key Features

    • Part number: DOW34
    • Seal type: Bonded seal washer with elastomer insert
    • Size: 3/4 in
    • Materials: Steel outer ring with nitrile rubber sealing element
    • Typical use: Sealing BSP threaded hydraulic fittings; adaptors; and banjo bolts
    • Benefits: High pressure sealing; reusable in many service applications
    Regular price £1.50
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £4.86
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    3/4 BSP x 3/4 BSP M/M Ad

    Key Features

    • Type: hydraulic fitting
    • Threads: 3/4 to 3/4 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £4.86
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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.