• Dual Pilot Operated Check Valve 1/4"BSP In Line - 20Lpm - Approved Hydraulics Limited
    Regular price £48.17
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    Dual Pilot Operated Check Valve 1/4"BSP In Line - 20Lpm

    Key Features

    • Type: double pilot operated check valve inline
    • Port size: 1/4' bsp
    • Function: locks cylinder in both directions until pilot pressure applied
    • Typical max pressure: up to 300 to 350 bar
    • Typical cracking: 0.5 bar check with pilot release
    Regular price £48.17
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  • 3/8 BSPP bi-directional flow control valve - Approved Hydraulics Limited
    Regular price £18.04
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    3/8 BSPP bi-directional flow control valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 3/8 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £18.04
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  • 3/8 BSPP bi-directional flow control valve - Approved Hydraulics Limited
    Regular price £18.04
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    1/4 BSPP Bi-Directional Flow Control Valve

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/4 thread
    • 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 £18.04
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  • Emmegi Emmegi Air-Oil Exchanger 100 lpm - 160 lpm - Oil Cooler with Relief Valve - Approved Hydraulics
    Regular price From £650.83
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    Emmegi Air-Oil Exchanger 100 lpm - 160 lpm - Oil Cooler with Relief Valve

    Key Features

    • Flow capacity options: 100 ; 120 ; 140 ; 160 l/min
    • Cooling capacity: ≈5.4-18 kW
    • Fan supply: 12 vdc ; 24 vdc
    • Bypass/relief: recommended to protect at cold start
    • Core rating: 20 bar max ; 35 bar test
    • Thermostat options: 40 ; 50 ; 60 ; 70 ; 80 ; 90 °c
    Regular price From £650.83
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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.

  • Hydra Part CETOP 3 single solenoid control valve NG06 All ports connected to X - Approved Hydraulics
    Regular price £53.59
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    CETOP 3 single solenoid control valve NG06 All ports connected to X

    Key Features

    • Centre spool: all ports connected to x
    • Solenoid: single solenoid
    • Interface: iso 4401-03 cetop 3 ng06
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price £53.59
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  • Hydra Part Double Acting Mini Cylinders - Approved Hydraulics
    Regular price From £136.26
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    Double Acting Mini Cylinders

    Key Features

    • Type: double acting mini cylinder
    • Mounting: 4 bolt side plate ; foot plate on rod end
    • Check valve: pilot operated check on port
    • Construction: compact ram for stabiliser duties
    • Stroke options: per model ; cut to spec
    Regular price From £136.26
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  • Hydra Part HP-GP30 Side & Rear Ported PTO Gear Pumps (82cc) - Approved Hydraulics
    Regular price From £232.43
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    GP30 Side & Rear Ported PTO Gear Pumps

    Key Features

    • Pump type: external gear ; pto
    • Design: bi rotational
    • Ports: side ; rear port options
    • Construction: 2 piece body ; high quality alloys
    • Use: truck pto systems ; high duty cycles
    Regular price From £232.43
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  • Hydra Part High Pressure Carry Over for Z50/Z80 Valve - Approved Hydraulics
    Regular price £11.09
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    High Pressure Carry Over for Z50/Z80 Valve

    Key Features

    • Accessory: high pressure carry over ; power beyond sleeve
    • Compatibility: z50 ; z80 monoblock valves
    • Use: enables downstream circuits ; converts open centre to power beyond
    • Installation: fits in end section kit ; see valve data sheet
    • Working pressure: as per base valve rating ; up to 250 bar typical
    • Notes: requires appropriate return to tank path for excess flow
    Regular price £11.09
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  • Hydra Part CETOP 5 Single Solenoid Control Valve NG06 - P to A & B to T (X - 11) - Approved Hydraulics
    Regular price From £88.93
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    CETOP 5 Single Solenoid Control Valve NG10 - P to A & B to T (X - 11)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Spool function: p to a ; b to t d spool
    • Nominal flow: 120 l/min
    • Max pressure: p ; a ; b 315 bar ; t 16 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Switch time: 50 to 70 ms
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £88.93
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  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Blocked - Approved Hydraulics
    Regular price From £108.82
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    CETOP 5 Double Solenoid Control Valve NG10, All Ports Blocked

    Key Features

    • Centre spool: all ports blocked
    • Interface: iso 4401-05 cetop 5 ng10
    • Max flow: 120 lpm
    • Max pressure: p ; a ; b 315 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £108.82
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  • Hydraulics Oil Tank Return Filter Element
    Regular price From £19.98
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    Hydraulics Oil Tank Return Filter Element

    Key Features

    • Type: hydraulic return filter element
    • Media: cellulose or microglass options depending on series
    • Micron rating: commonly 10 or 25 classes available
    • Service: replaceable element for tank return filter housings
    • Use: maintain ISO cleanliness targets in hydraulic circuits
    Regular price From £19.98
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  • Out of Stock
    Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/2" Rear Entry - Approved Hydraulics
    Regular price £21.61
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    100mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/2" Rear Entry

    Key Features

    • Dial: 100 mm
    • Filling: glycerine filled
    • Entry: 1/2\" bsp rear 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 £21.61
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  • Out of Stock
    Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/2" Rear Entry - Approved Hydraulics
    Regular price £40.81
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    100mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/2" Rear Entry

    Key Features

    • Dial: 100 mm
    • Filling: glycerine filled
    • Entry: 1/2\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-6000 psi ( 400 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £40.81
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    • Order by 3pm for Next Day Delivery
  • Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-9000 Psi (600 Bar) 1/4" Rear Entry - Approved Hydraulics
    Regular price £9.42
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    63mm Glycerine Hydraulic Pressure Gauge 0-9000 Psi (600 Bar) 1/4" Rear Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-9000 psi ( 600 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £9.42
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    • Order by 3pm for Next Day Delivery
  • Hydra Part Poppet Check Valve 1/2" 90Lpm, 350 Bar Max Pressure - Approved Hydraulics
    Regular price From £12.06
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    Poppet Check Valve 1/2" 90Lpm, 350 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 1/2' bsp
    • Max flow: 90 l/min
    • Max pressure: 350 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price From £12.06
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  • ABER Tipping Valves (130 lpm, 350 bar) - Approved Hydraulics Limited
    Regular price £226.91
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    ABER Tipping Valves (130 lpm, 350 bar)

    Key Features

    • Max flow: up to 130 l/min
    • Working pressure: up to 300 bar
    • Relief valve setting: 350 bar
    • Ports: P/C/T 3/4" BSP; pilot 1/8" BSP
    • Control: pneumatic or manual
    • Application: single-acting tipping gear (open circuit, progressive descent)
    • Approx weight: ~5.2 kg
    • Mounting: direct to tank or chassis
    Regular price £226.91
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  • Out of Stock
    Single Acting/Tipper Hydraulic Power Packs - 1.6kW - 2 Button Pendant Control - 160 Bar Preset
    Regular price From £210.67
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    Single Acting/Tipper Hydraulic Power Packs - 1.6kW - 2 Button Pendant Control - 160 Bar Preset

    Key Features

    • Motor: 1.6 kw dc
    • Control: 2 button pendant
    • Pressure preset: 160 bar
    • Supply: 12 vdc ; 24 vdc
    • Tank options: 1.5 ; 5 ; 8 ; 11 ; 18 l
    • Use: single acting tipper ; dump body
    Regular price From £210.67
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  • Scanreco Neck Strap
    Regular price £115.97
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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 £115.97
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  • Scanreco Antenna Extension (2.5m)
    Regular price £97.10
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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 £97.10
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  • Proportional 5 Pin Paddle - Approved Hydraulics Limited
    Regular price £229.54
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    Proportional 5 Pin Paddle

    Key Features

    • Type: proportional paddle lever for RC400 transmitters
    • Connector: 5 pin electrical interface
    • Return: spring return to center
    • Integration: Mini and Maxi portable control units
    • Use: proportional function control with fingertip actuation
    Regular price £229.54
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  • Mead PTO Switch - Panel/Dash Mounted Air Control Valve (Manual Air Release) - Approved Hydraulics
    Regular price £103.94
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    PTO Switch - Panel/Dash Mounted Air Control Valve (Manual Air Release)

    Key Features

    • Type: panel or dash mounted pneumatic PTO control valve
    • Function: manually operated 4/2 directional switching
    • Ports: push in fittings typically 6 mm
    • Reset: pneumatic reset with indicator band
    • Use: PTO actuation ; hoist ; auxiliary cylinders
    Regular price £103.94
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  • Scanreco Proportional 4 Pin Paddle - Approved Hydraulics
    Regular price £229.54
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    Proportional 4 Pin Paddle

    Key Features

    • Type: proportional paddle lever for RC400 transmitters
    • Connector: 4 pin electrical interface
    • Return: spring return to center
    • Integration: Mini and Maxi portable control units
    • Use: proportional function control with fingertip actuation
    Regular price £229.54
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  • Banjo Tubes - Approved Hydraulics Limited
    Regular price From £17.24
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    Banjo Tubes

    Key Features

    • Type: banjo tube
    • Function: compact 90 degree fluid path at joint
    • Use: space constrained hydraulic connections
    • Thread: per selection
    • Material: steel
    Regular price From £17.24
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  • Support for Hydra Part Cab Control Units - Approved Hydraulics Limited
    Regular price £24.40
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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 £24.40
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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.