• BSPP One Way Flow Control Valves - Approved Hydraulics Limited
    Regular price From £19.97
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    BSPP One Way Flow Control Valves

    Key Features

    • Type: one-way flow control (throttle/check)
    • Ports: as specified
    • Function: free flow one direction; metered flow opposite via needle
    • Body: barrel pattern for in-line mounting
    • Use: control extend or retract speed on cylinders
    Regular price From £19.97
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    Scanreco Neck Strap - Approved Hydraulics Limited
    Regular price £121.78
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    Scanreco Neck Strap

    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 £121.78
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  • Scanreco Antenna Extension (2.5m) - Approved Hydraulics Limited
    Regular price £101.96
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    Scanreco Antenna Extension (2.5m)

    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 £101.96
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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.

  • Support for Hydra Part Cab Control Units - Approved Hydraulics Limited
    Regular price £25.62
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    Support for Hydra Part Cab Control Units

    Key Features

    • Type: cab control housing
    • Function: mount levers ; toggles and indicators
    • Construction: steel enclosure
    • Use: operator interface on vehicle or plant
    • Ingress: ip rating per build
    • Mounting: dash or pedestal mount
    Regular price £25.62
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  • High Pressure 3 Port Manual Diverter Valve - Steel 1" 500Bar - Approved Hydraulics Limited
    Regular price £137.88
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    High Pressure 3 Port Manual Diverter Valve - Steel 1" 500Bar

    Key Features

    • Type: 3 port manual diverter valve
    • Ports: 1" bsp
    • Pressure: up to 500 bar class
    • Body: steel construction
    • Use: select pressure line between two circuits
    Regular price £137.88
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  • 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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    Hydra Part Poppet Check Valve 3/8" 50Lpm, 400 Bar Max Pressure - Approved Hydraulics
    Regular price £13.49
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    Poppet Check Valve 3/8" 50Lpm, 400 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 3/8' bsp
    • Max flow: 50 l/min
    • Max pressure: 400 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £13.49
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  • BSPP Female Poppet Check Valve - Cracking Pressure 0.5 Bar - Approved Hydraulics Limited
    Regular price From £7.09
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    BSPP Female Poppet Check Valve - Cracking Pressure 0.5 Bar

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: as specified
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price From £7.09
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  • Out of Stock
    Solenoid Operated Diverter Valve, 3 Ways, 3/4" BSP, Open Centre (Various Voltage) - Approved Hydraulics Limited
    Regular price £86.46
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    Solenoid Operated Diverter Valve, 3 Ways, 3/4" BSP, Open Centre (Various Voltage)

    Key Features

    • Ways: 3 way
    • Ports: 3/4" bspp
    • Centre: open centre body
    • Voltage options: 12 vdc ; 24 vdc
    • Use: select between two circuits
    Regular price £86.46
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  • Hydra Part Bent Axis DIN Piston Pumps (34-130cc) - Approved Hydraulics
    Regular price From £620.34
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    Hydra Part Bent Axis DIN Piston Pumps (34-130cc)

    Key Features

    • Type: bent axis piston pump
    • Mounting: din interface
    • Displacements: 34 to 130 cc options
    • Characteristics: high efficiency ; high pressure capability
    • Use: mobile ; industrial circuits
    Regular price From £620.34
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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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    Hydra Part Tipper & PTO Cab Control Unit - Approved Hydraulics
    Regular price £109.62
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    Tipper & PTO Cab Control Unit

    Key Features

    • Use case: In-cab control of PTO engagement and tipping functions
    • Use case: Power take off unit for driving hydraulic pumps on commercial vehicle gearboxes
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £109.62
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  • Out of Stock
    Hydra Part 1/2" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £152.84
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    1/2" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Port size: 1/2\" bsp
    • Type: 3 port priority flow control
    • Compensation: pressure compensated priority flow
    • Bypass: excess flow bypass to line
    • Use: maintains set actuator flow under load changes
    Regular price £152.84
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  • Hydra Part Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft & Flanged Body - Approved Hydraulics
    Regular price From £74.96
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    Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft & Flanged Body

    Key Features

    • Type: bi rotational external gear pump
    • Group: 2
    • 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 £74.96
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  • Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/2" Bottom Entry - Approved Hydraulics
    Regular price £22.70
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    100mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/2" Bottom Entry

    Key Features

    • Dial: 100 mm
    • Filling: glycerine filled
    • Entry: 1/2\" bsp bottom entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-3500 psi ( 250 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £22.70
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  • Hydra Part CETOP 5 Modular Double Pilot Operated Check Valve on A & B (Z2DS-10) - Approved Hydraulics
    Regular price £86.32
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    CETOP 5 Modular Double Pilot Operated Check Valve on A & B (Z2DS-10)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Type: double pilot operated check valve
    • Ports: checks on a and b
    • Max operating pressure: 315 bar
    • Nominal flow: 80 l/min
    • Use: load holding on cylinders ; pilot release for motion
    Regular price £86.32
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £3.18
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    3/8" BSP Male x 1/2" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 3/8 to 1/2 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £3.18
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  • Out of Stock
    Scanreco Decal Set (45676) - Approved Hydraulics Limited
    Regular price £7.91
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    Scanreco Decal Set (45676)

    Key Features

    • Type: transmitter decal set
    • Compatibility: scanreco mini ; maxi panels
    • Material: uv resistant self adhesive overlays
    • Function: replace function legends and symbols
    • Use: refresh worn labels on remote transmitters
    Regular price £7.91
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  • Mini Radio Remote Control 4 Button For 2 x Double  Actiong Valves Operation 12-24VDC - Approved Hydraulics Limited
    Regular price £106.88
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    Mini Radio Remote Control 4 Button For 2 x Double Actiong Valves Operation 12-24VDC

    Key Features

    • Control: 2 x double acting valves
    • Buttons: 4
    • Supply: 12 vdc ; 24 vdc
    • Interface: radio wireless control
    • Typical applications: multi function mobile hydraulics ; cranes ; tail lifts ; tippers
    Regular price £106.88
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  • M5 x 150 Cap head bolt - Approved Hydraulics Limited
    Regular price £2.21
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    M5 x 150 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 150 mm
    • Drive: internal hex for controlled tightening
    • Use: hydraulic assemblies; covers; brackets
    Regular price £2.21
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  • CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.79
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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 £13.79
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  • Scanreco Cigarette Plug Adaptor 12V/24V (Hydra Part) - Approved Hydraulics Limited
    Regular price £22.52
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    Scanreco Cigarette Plug Adaptor 12V/24V (Hydra Part)

    Key Features

    • Voltage: 12 V ; 24 V options
    • Use case: Power take off unit for driving hydraulic pumps on commercial vehicle gearboxes
    • Brand: Scanreco
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    Regular price £22.52
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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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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.