• Hydra Part 3/4" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £270.25
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    3/4" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Function: 3 way pressure compensated with bypass to pressure line
    • Max inlet flow: 120 l/min
    • Max adjusted flow: 100 l/min
    • Max pressure: 350 bar
    • Use: priority flow to circuit ; bypass maintains line pressurised
    Regular price £270.25
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  • Hydra Part Hydra Part Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out - Approved Hydraulics
    Regular price £102.32
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    Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out

    Key Features

    • Type: spring centred ; pressure released detent auto return
    • Nominal flow: 80 to 81 l/min
    • Ports: inlet ; outlet 3/4' bsp ; work a ; b 1/2' bsp
    • Function: auto kick out to neutral at end of extend stroke
    • Relief: adjustable system relief integrated
    Regular price £102.32
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  • Hydra Part Hydraulic Oil ISO 46, 20 Litres - Approved Hydraulics
    Regular price £48.05
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    Hydraulic Oil ISO 46, 20 Litres

    Key Features

    • Viscosity grade: iso vg 46
    • Type: anti wear hydraulic oil
    • Additives: anti oxidation ; anti foam ; anti rust
    • Applications: industrial and mobile hydraulic systems
    • Pack size: 20 litres
    Regular price £48.05
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  • Scanreco Proportional 4 Pin Paddle - Approved Hydraulics
    Regular price £229.54
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    • Delivery to UK & Ireland

    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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  • 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 Scanreco Battery for Mini and Maxi Transmitters - Approved Hydraulics
    Regular price £160.72
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    Scanreco Battery for Mini and Maxi Transmitters

    Key Features

    • Chemistry: nimh
    • Voltage: 7.2 v nominal
    • Capacity class: ≈2000 mah standard
    • Compatibility: scanreco mini ; maxi transmitter packs
    • Application: hydraulic attachment component
    Regular price £160.72
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  • Scanreco Scanreco Quick Battery Charger with 110-230vAC Mains Adapter - Approved Hydraulics
    Regular price £336.42
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    Scanreco Quick Battery Charger with 110-230vAC Mains Adaptor Type 434

    Key Features

    • Input: 110-230 vac mains
    • Charger type: g2 nimh standard type 434 ; 435 family
    • Compatibility: scanreco mini ; maxi transmitters
    • Note: mains adapter included
    • Application: hydraulic attachment component
    Regular price £336.42
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  • Scanreco Scanreco Battery Charger with 10-30vDC Car Adapter - Approved Hydraulics
    Regular price £327.88
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    Scanreco Battery Charger with 10-30vDC Car Adaptor

    Key Features

    • Input: 10-35 vdc vehicle supply
    • Battery type: g2 nimh 7.2 v
    • Compatibility: scanreco mini ; maxi transmitters
    • Mounting: on machine ; rugged
    • Application: hydraulic attachment component
    Regular price £327.88
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    • Order by 3pm for Next Day Delivery
  • Scanreco Retro Fit Radio Remote Control, 6 Functions - Approved Hydraulics
    Regular price £5,543.42
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    Retro Fit Radio Remote Control, 6 Functions

    Key Features

    • Type: retrofit radio remote control kit
    • Functions: 4 proportional functions standard
    • Compatibility: manual valve banks via servo modules
    • Supply: 12 to 24 vdc
    • Use: upgrade cranes or machines to proportional remote control
    Regular price £5,543.42
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    • Order by 3pm for Next Day Delivery
  • Scanreco Retro Fit Radio Remote Control, 4 Functions - Approved Hydraulics
    Regular price £5,094.59
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    Retro Fit Radio Remote Control, 4 Functions

    Key Features

    • Type: retrofit radio remote control kit
    • Functions: 4 proportional functions standard
    • Compatibility: manual valve banks via servo modules
    • Supply: 12 to 24 vdc
    • Use: upgrade cranes or machines to proportional remote control
    Regular price £5,094.59
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Modular Flow Control Valve (Z2FDS-6-30-S2) - Approved Hydraulics
    Regular price £58.37
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    CETOP 3 Modular Flow Control Valve (Z2FDS-6-30-S2)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: double throttle ; check modular flow control
    • Nominal flow: 80 l/min
    • Operating pressure: up to 315 bar
    • Throttle style: s2 meter out
    • Function: metered flow one way ; free flow via checks opposite
    Regular price £58.37
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  • Hydra Part CETOP 5 Modular Double Pilot Operated Check Valve on A & B (Z2DS-10) - Approved Hydraulics
    Regular price £82.20
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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 £82.20
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Pressure Reducing Module Valve - B to T (ZPR-6-D-B-1-30-210YM) - Approved Hydraulics
    Regular price £88.90
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    CETOP 3 Pressure Reducing Module Valve - B to T (ZPR-6-D-B-1-30-210YM)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: 3 way direct operated pressure reducing
    • Reduced port: b to t
    • Primary pressure: max 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 30 l/min
    • Use: branch pressure trimming on one work port
    Regular price £88.90
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Pressure Reducing Module - A to T (ZPR-6-D-A-1-30-210YM) - Approved Hydraulics
    Regular price £75.70
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    CETOP 3 Pressure Reducing Module - A to T (ZPR-6-D-A-1-30-210YM)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: 3 way direct operated pressure reducing
    • Reduced port: a to t
    • Primary pressure: max 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 30 l/min
    • Use: branch pressure trimming on one work port
    Regular price £75.70
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Pilot Operated Relief Valve Module - A&B to T (Z-2-PB-10-VC-1-315) - Approved Hydraulics
    Regular price £125.34
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    CETOP 5 Pilot Operated Relief Valve Module - A&B to T (Z-2-PB-10-VC-1-315)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pilot operated relief a and b to t
    • Max operating pressure: 315 bar
    • Max flow: 100 l/min
    • Temp range: -20 c to +70 c
    • Weight: 3.1 kg
    • Channels: a ; b ; a+b vc option
    Regular price £125.34
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315) - Approved Hydraulics
    Regular price £97.24
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    CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pilot operated pressure relief p to t
    • Max operating pressure: 315 bar
    • Max flow: 100 l/min
    • Temp range: -20 c to +70 c
    • Weight: 2.6 kg
    • Typical use: system relief on cetop 5 stacks
    Regular price £97.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Pressure Reducing Module Valve - P to T (ZPR-6-D-P-1-210YM) - Approved Hydraulics
    Regular price £75.70
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Pressure Reducing Module Valve - P to T (ZPR-6-D-P-1-210YM)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: 3 way direct operated pressure reducing
    • Primary pressure: max 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 30 l/min
    • Ports: reduction in p ; relief to t
    • Typical use: reduce downstream circuit pressure below main line
    Regular price £75.70
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Pilot Operated Relief Valve Module - (Z-2-PB-6-VC-1-315) - Approved Hydraulics
    Regular price £138.88
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    • Delivery to UK & Ireland

    CETOP 3 Pilot Operated Relief Valve Module - (Z-2-PB-6-VC-1-315)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Function: pilot operated relief a and b to t
    • Max operating pressure: 315 bar
    • Max flow: 60 l/min
    • Temp range: -20 c to +70 c
    • Weight: 1.9 kg
    • Channels: a ; b ; a+b vc options
    Regular price £138.88
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Modular Pressure Relief Valve - P to T - (ZPB-6-VP-1-315) - Approved Hydraulics
    Regular price £82.20
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Modular Pressure Relief Valve - P to T - (ZPB-6-VP-1-315)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Function: pilot operated pressure relief p to t
    • Max operating pressure: 315 bar
    • Max flow: 60 l/min
    • Temp range: -20 c to +70 c
    • Weight: 1.3 kg
    • Typical use: system overpressure protection on cetop 3 stacks
    Regular price £82.20
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 single solenoid control valve NG10 All ports connected to X - Approved Hydraulics
    Regular price From £85.75
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    CETOP 5 single solenoid control valve NG10 All ports connected to X

    Key Features

    • Centre spool: all ports connected to x
    • Solenoid: single solenoid
    • 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 £85.75
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Blocked - Approved Hydraulics
    Regular price From £108.82
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    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Open - Approved Hydraulics
    Regular price From £101.87
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, All Ports Open

    Key Features

    • Centre spool: all ports open
    • 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 £101.87
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked - Approved Hydraulics
    Regular price From £108.82
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked

    Key Features

    • Centre spool: a and b to t ; p 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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, P to T - A & B Blocked - Approved Hydraulics
    Regular price From £114.82
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, P to T - A & B Blocked

    Key Features

    • Centre spool: p to t ; a and b 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 £114.82
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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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.