• Protective Black Frame For Radio Remote Control Mini Transmitter Scanreco RC400
    Regular price £218.12
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    Protective Black Frame For Radio Remote Control Mini Transmitter Scanreco RC400

    Key Features

    • Type: protective black frame for mini transmitter
    • Compatibility: rc400 g2b mini housing
    • Protection: impact and abrasion shield for transmitter edges
    • Access: leaves display ; buttons and e stop unobstructed
    • Use: maintain durability in harsh mobile environments
    Regular price £218.12
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  • Antenna extension cable 10M
    Regular price £167.74
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    Antenna extension cable 10M

    Key Features

    • Type: antenna extension cable for RC400 receiver
    • Length: as specified in title
    • Impedance: 50 ohm typical
    • Connector: coax connection for RC400 antenna port
    • Use: optimise radio reception by relocating antenna
    Regular price £167.74
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  • Parker Coil 24VDC for Proportional cartridge GP0130N) 13mm hole x 40mm long 2 pin DIN 43650 - Approved Hydraulics Limited
    Regular price £127.21
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    Parker Coil 24VDC for Proportional cartridge GP0130N) 13mm hole x 40mm long 2 pin DIN 43650

    Key Features

    • Type: solenoid coil for proportional cartridge
    • Voltage: 24 vdc nominal
    • Connector: din 43650 form a 2 pin
    • Core tube: 13 mm bore ; 40 mm length fitment
    • Use: drive proportional cartridge valve operation
    Regular price £127.21
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  • Scanreco Proportional Single Module PWM For MOD10 Servo Unit 24V Includes Mounting Bolts.
    Regular price £476.24
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    Scanreco Proportional Single Module PWM For MOD10 Servo Unit 24V Includes Mounting Bolts.

    Key Features

    • Type: proportional single module for MOD10 actuator block
    • Supply: 24 vdc
    • Control: PWM electromagnetic section with mechanical feedback
    • Mounting: bolts included for block assembly
    • Use: add one proportional function to manual valve bank
    Regular price £476.24
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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.

  • Scanreco Maxi Transmitter Emergency Stop Button - Approved Hydraulics Limited
    Regular price £83.72
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    Scanreco Maxi Transmitter Emergency Stop Button

    Key Features

    • Type: scanreco radio remote component
    • Compatibility: rc400 series
    • Use: proportional control ; machine remote operation
    • Note: model specific details per part number
    • Service: consult oem manual for wiring
    Regular price £83.72
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  • 24v Coil for MOD09 Hydraulic Actuator - Approved Hydraulics Limited
    Regular price £64.38
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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 £64.38
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  • Scanreco Don't Forget Me Device For RC400 Transmitter - Approved Hydraulics
    Regular price £312.20
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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 £312.20
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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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  • Out of Stock
    45L-50L Control Valve 3 Position Detent Kit (G)
    Regular price £34.97
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    45L-50L Control Valve 3 Position Detent Kit (G)

    Key Features

    • Part number: 30075303
    • Compatibility: 45L; 50L control valve family
    • Detent type: 3 position detent kit; type G
    • Function: Locks spool in 3 working positions without holding the lever
    • Typical use: Continuous functions such as motors or extended actuator cycles
    • Installation: Retrofit kit for valve spool end cap assembly
    Regular price £34.97
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  • Electro Pneumatic 3/2 valve (N/O) without coil for 8EP3 for direct into cylinder kit (G-S)
    Regular price £12.48
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    Electro Pneumatic 3/2 valve (N/O) without coil for 8EP3 for direct into cylinder kit (G-S)

    Key Features

    • Voltage: 12 vdc
    • Power: 3 w rating
    • Hole: 9 mm through-bore
    • Body length: 30 mm
    • Ingress protection: IP65
    • Duty: 100% ed
    • Use: electro-pneumatic 8EP3/8EP4 valves
    Regular price £12.48
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  • Grease Nipple 1/8 BSP - Approved Hydraulics Limited
    Regular price £0.78
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    Grease Nipple 1/8 BSP

    Key Features

    • Thread: 1/8 bsp
    • Type: standard zerk lubrication fitting
    • Use: periodic greasing of moving joints
    • Application: hydraulic levers ; linkages ; hinges
    • Application: hydraulic component
    Regular price £0.78
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  • Electrical plug for 12/24VDC coils EP3/4 kits
    Regular price £1.49
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    Electrical plug for 12/24VDC coils EP3/4 kits

    Key Features

    • Connector: DIN 43650-A ; 3 pole + earth
    • Ingress protection: IP65 with gasket
    • Rating: up to 240 vac ; 10 a
    • Use: mates to EP3/EP4 solenoid coils 12 ; 24 vdc
    • Application: hydraulic component
    Regular price £1.49
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  • Out of Stock
    Hydraulic Leg Lock off Valve - Isolator - Diverter valve 3/8" - Approved Hydraulics Limited
    Regular price £134.50
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    Hydraulic Leg Lock off Valve - Isolator - Diverter valve 3/8"

    Key Features

    • Type: lock off ; diverter valve
    • Port size: 3/8"
    • Function: isolate hydraulic leg circuit
    • Use: service ; transport safety
    • Application: hydraulic system component
    Regular price £134.50
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  • 3/8 BANJO BOLT (35mm long) - Approved Hydraulics Limited
    Regular price £5.29
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    3/8 BANJO BOLT (35mm long)

    Key Features

    • Part number: BJBOLT-06
    • Bolt size: 3/8 in banjo bolt
    • Length: 35 mm
    • Connection type: Hollow banjo bolt for banjo body fittings
    • Typical use: Hydraulic banjo joints for compact hose or tube routing
    • Sealing method: Requires sealing washers either side of banjo body
    Regular price £5.29
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  • CETOP 5 Coil  - 12VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £27.13
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    CETOP 5 Coil - 12VDC, (31mm Bore x 75mm long)

    Key Features

    • Part number: HP-31-75-COIL-12VDC
    • Valve standard: CETOP 5 / NG10 solenoid coil for directional control valves
    • Supply voltage: 12 VDC
    • Coil bore: 31 mm armature tube bore
    • Coil length: 75 mm overall length
    • Electrical connection: Typically via DIN 43650 / EN 175301-803 plug
    • Function: Energises solenoid valve to shift spool for flow direction control
    • Typical use: Mobile hydraulics; manifolds; power packs
    Regular price £27.13
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  • Rotary Shaft seal 17x30x7 R23 High Pressure - Approved Hydraulics Limited
    Regular price £5.94
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    Rotary Shaft seal 17x30x7 R23 High Pressure

    Key Features

    • Size: 17 x 30 x 7 mm
    • Profile: R23 (double lip with dust lip)
    • Rating: high pressure capable (application dependent)
    • Material: oil-resistant elastomer with spring energised lip
    • Use: hydraulic pumps; motors; gearboxes (rotating shafts)
    Regular price £5.94
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  • CETOP 5 Coil  - 24VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £27.13
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    CETOP 5 Coil - 24VDC, (31mm Bore x 75mm long)

    Key Features

    • Interface: CETOP 5
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £27.13
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  • Out of Stock
    11cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain
    Regular price £171.06
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    11cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain

    Key Features

    • Displacement: 11.3 cm3.rev (Group 2)
    • Mounting: 4 bolt European flange ; Ø36.5 spigot
    • Shaft: 1.8 taper with key
    • Ports: 3/4" BSP P.A.B ; 1/4" BSP case drain
    • Rotation: bi directional reversible
    • Working pressure: up to ~250–300 bar model dependent
    • Construction: aluminium body ; cast iron end covers ; pressure balanced
    Regular price £171.06
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  • CETOP 5 Coil  - 110VAC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £24.73
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    CETOP 5 Coil - 110VAC, (31mm Bore x 75mm long)

    Key Features

    • Valve size: CETOP 5 ; ISO 4401-05
    • Voltage: 110 VAC 50.60 Hz
    • Core ; length: Ø 31 mm bore ; 75 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with proper DIN plug
    • Duty: continuous service ; wet armature compatible
    Regular price £24.73
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  • HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve
    Regular price £28.21
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    HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve

    Key Features

    • Compatibility: HP50 monoblock control valve sections
    • Assembly: complete wet spool lever cap with lever hardware
    • Rated flow of valve: 50 l.min HP50 valve family
    • Seal type: wet armature design with O ring sealing
    • Use: service kit to replace damaged cap ; restores manual actuation
    Regular price £28.21
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  • Out of Stock
    3/8" Cylinder Breather - Approved Hydraulics Limited
    Regular price £12.59
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    3/8" Cylinder Breather

    Key Features

    • Thread: 3/8" BSP
    • Function: vents cylinder to atmosphere while filtering intake air
    • Element: integrated filter to reduce contamination ingress
    • Use: maintains pressure balance; prevents vacuum build-up
    • Application: hydraulic cylinders; gearboxes; reservoirs
    Regular price £12.59
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  • Out of Stock
    3 WAY PRIORITY VALVE - EXCESS TO LINE 3/4"
    Regular price £144.54
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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 £144.54
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  • M5 x 110 CAP head bolt
    Regular price £2.22
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    M5 x 110 CAP head bolt

    Key Features

    • Thread: metric M5
    • Length: 110 mm
    • Head: socket cap
    • Material: high tensile steel (typical)
    • Use: hydraulic assemblies; brackets; adapters
    • Drive: internal hex for controlled tightening
    Regular price £2.22
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  • ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings
    Regular price £96.30
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    ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings

    Key Features

    • Mounting interfaces: PTO EN.ISO 4 bolt to UNI 3 bolt
    • Integrated bearing: one ball bearing
    • Max torque: 315 N.m
    • Max power at 1000 rpm: 33 kW
    • Use case: fit UNI 3 bolt pumps to ISO 4 bolt PTO housings
    • Construction: steel adaptor with precision machining
    • Accessories: studs ; gaskets available in kits
    Regular price £96.30
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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.