• CETOP 3 Coil  -24VDC Coil (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £14.41
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    CETOP 3 Coil -24VDC Coil (23mm Bore x 50mm long)

    Key Features

    • Voltage: 24 vdc
    • Bore: 23 mm
    • Length: 50 mm
    • Connection: din 43650 a
    • Use: cetop 3 solenoid valves
    Regular price £14.41
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  • Standard DIN Hirschmann Connector Plug - Black - Approved Hydraulics Limited
    Regular price £4.34
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    Standard DIN Hirschmann Connector Plug - Black

    Key Features

    • Standard: EN 175301-803 DIN 43650
    • Pins: 3 pin; 2 pole and earth
    • Cable gland range: 4 mm to 9 mm cable diameter
    • Ingress protection: IP67 when correctly assembled
    • Current rating: 16 A max
    • Voltage rating: AC up to 250 V; DC up to 300 V
    • Typical use: Solenoid valve coils and industrial sensors
    Regular price £4.34
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  • CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    CETOP 3 Coil - 12VDC, (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 12 VDC
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A or AMP Jr versions depending on brand
    • Protection: IP65 with suitable connector
    • Power class: typically ~20–29 W DC coils for NG6
    Regular price £13.13
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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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  • 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.

  • M5 x 120 Cap Head bolt
    Regular price £2.22
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    M5 x 120 Cap Head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 120 mm
    • Drive: internal hex (Allen)
    • Use: hydraulic brackets; manifolds; general assemblies
    Regular price £2.22
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  • Out of Stock
    Oil Level & Temperature Gauge (12mm)
    Regular price £23.10
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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 £23.10
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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
    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 Standard Lever Box (Excluding Lever)
    Regular price £13.80
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    80L Control Valve Standard Lever Box (Excluding Lever)

    Key Features

    • Series: 80L GS sectional control valve
    • Actuator: manual lever box
    • Interface: lever M10 thread input
    • Use: mechanical actuation of spool
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £13.80
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  • 90L Monobloc Valve High pressure carry over plug 1/2" - Approved Hydraulics Limited
    Regular price £17.00
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    90L Monobloc Valve High pressure carry over plug 1/2"

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 1/2" bsp
    • Compatibility: 90l monoblock valves
    • Use case: cascade 2nd control valve downstream
    • System rating: for systems operating to 315 bar with host valve
    Regular price £17.00
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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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  • 1" BSP Spy Eye Level Gauge (Clear)
    Regular price £11.65
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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 £11.65
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  • JS100 Cable Operated Joystick
    Regular price £53.28
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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 £53.28
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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
    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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  • Out of Stock
    In-Line Pressure Reducing And Relieving Valve Direct Acting with Check - Approved Hydraulics Limited
    Regular price £115.56
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    In-Line Pressure Reducing And Relieving Valve Direct Acting with Check

    Key Features

    • Max Flow: 30LPM
    • Max Pressure REG: 140 Bar
    • Max Pressure IN: 350 Bar
    • Function: Pressure reducing and relief regulation with check; protects downstream circuit
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    Regular price £115.56
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  • Scanreco Cross Rod Clamp Brackets - Approved Hydraulics Limited
    Regular price £22.32
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    Scanreco Cross Rod Clamp Brackets

    Key Features

    • Brand: Scanreco
    • 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 £22.32
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  • 1" Quick Release Coupling (Screw Type, Female)
    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"
    Regular price From £81.30
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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 £81.30
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  • Hydra Part FLOW DIVIDER/COMBINER 1/2" in 3/8" Inlet Capy. 24-38 LPM - Approved Hydraulics
    Regular price £117.16
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    FLOW DIVIDER/COMBINER 50/50 1/2" in 3/8"out Inlet Capy. 24-38 LPM

    Key Features

    • Function: 50 ; 50 flow divider ; combiner
    • Porting: 1/2" bsp in ; 3/8" bsp out
    • Flow range: 24-38 lpm
    • Accuracy: maintains equal flows within typical tolerance
    • Use: synchronise two actuators ; recombine return flow
    • Mounting: in line
    Regular price £117.16
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  • Hydra Part Double Counterbalance Valve 3/4" In Line - 100-350Bar (Aluminium Body) - Approved Hydraulics
    Regular price £195.64
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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 £195.64
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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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    • Delivery to UK & Ireland
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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.