• Hydra Part Double Counterbalance Valve 3/8" In Line - 100-350Bar - Approved Hydraulics
    Regular price £145.61
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Double Counterbalance Valve 3/8" In Line - 100-350Bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 3/8"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £145.61
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part HP-GP30 Power Take Off Gear Pumps - Approved Hydraulics
    Regular price From £204.00
    • All Items Guaranteed
    • Delivery to UK & Ireland

    GP30 Power Take Off Gear Pumps

    Key Features

    • Use case: PTO driven hydraulic gear pump for mobile hydraulics; tipping; cranes; auxiliaries
    • Pump type: Hydraulic pump; see title for series and configuration
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price From £204.00
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2 BSPP Double Cross Relief Valve 50 L/Min 70/350 Bar - Steel Body
    Regular price £67.92
    • All Items Guaranteed
    • Delivery to UK & Ireland

    1/2 BSPP Double Cross Relief Valve 50 L/Min 70/350 Bar - Steel Body

    Key Features

    • Type: BSP tee adaptor
    • Connections: BSP threading per title
    • Threads: 1/2 thread
    • Material: plated carbon steel for hydraulic service
    • Use: split or combine lines; add instruments or auxiliary circuits
    Regular price £67.92
    • All Items Guaranteed
    • 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
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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 Battery 3300mAh Type 593 (for Colour Display)
    Regular price £240.22
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Scanreco Battery 3300mAh Type 593 (for Colour Display)

    Key Features

    • Type: rechargeable battery cassette type 593
    • Chemistry: nimh
    • Voltage: 7.2 vdc nominal
    • Capacity: around 3300 mah class
    • Compatibility: scanreco mini and maxi transmitters
    Regular price £240.22
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 20 Litres - Approved Hydraulics Limited
    Regular price £47.46
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic Oil ISO 32, 20 Litres

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 20 l drum
    Regular price £47.46
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    PTO Gear Pump Flange Adaptors
    Regular price From £73.98
    • All Items Guaranteed
    • Delivery to UK & Ireland

    PTO Gear Pump Flange Adaptors

    Key Features

    • Function: Adaptor between PTO gearboxes and external gear pumps
    • Flange patterns: EU 4 bolt ; SAE A/B and brand specific options
    • Shaft interfaces: 1/8 taper ; 1/5 taper ; parallel ; splined options
    • Pump groups: Group 2 ; Group 3 compatibility
    • Use: Mount pump securely to PTO for mobile hydraulic kits
    Regular price From £73.98
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Series 700 Brake Cylinders
    Regular price £44.94
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Series 700 Brake Cylinders

    Key Features

    • Application: Hydraulic brake actuation for agricultural ; mobile equipment
    • Rod options: Ø25 mm ; Ø30 mm variants
    • Working pressure: 200 bar nominal ; 250 bar max
    • Speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Notes: Fork rod end versions suit bogie braking linkages
    Regular price £44.94
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    4 Port Manual Diverter Valve - 1/2" Open Centre
    Regular price £60.89
    • All Items Guaranteed
    • Delivery to UK & Ireland

    4 Port Manual Diverter Valve - 1/2" Open Centre

    Key Features

    • Type: 4 port 2 position manual diverter spool
    • Ports: 1/2" bsp
    • Centre: open centre
    • Use: select between two actuator circuits
    • Body: steel with plated handle
    Regular price £60.89
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar
    Regular price £98.78
    • All Items Guaranteed
    • Delivery to UK & Ireland

    High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar

    Key Features

    • Type: 3 port manual lever diverter ; open centre
    • Pressure rating: up to 500 bar
    • Port size: 3/4"
    • Function: diverts inlet to a or b ; closed centre when specified
    • Use: circuit selection on high pressure lines
    Regular price £98.78
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £160.25
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 - P to T - A&B Blocked with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; p to t ; a ; b blocked
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £160.25
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Double Counterbalance Valve 1/2" In Line - 100-350Bar - Approved Hydraulics
    Regular price £151.78
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Double Counter Balance / Overcentre Valve 1/2" IN LINE 100-350 bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 1/2"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £151.78
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Motors (MV Series) - Approved Hydraulics Limited
    Regular price From £403.48
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic Motors (MV Series)

    Key Features

    • Series: mv high torque
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    • Features: tapered roller bearings for high radial ; axial loads
    • Displacements: 315 cc to 800 cc
    Regular price From £403.48
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part 1" 3 port manual diverter valve (open centre) - Approved Hydraulics
    Regular price £116.57
    • All Items Guaranteed
    • Delivery to UK & Ireland

    1" 3 port manual diverter valve (open centre)

    Key Features

    • Port size: 1\" bsp
    • Configuration: 3 way ; 2 position open centre
    • Function: manual rotary diverter for circuit selection
    • Mounting: in line installation
    • Typical applications: circuit selection for attachments ; auxiliary functions
    Regular price £116.57
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-2300 Psi (160 Bar) 1/4" Bottom Entry - Approved Hydraulics
    Regular price £18.44
    • All Items Guaranteed
    • Delivery to UK & Ireland

    63mm Glycerine Hydraulic Pressure Gauge 0-2300 Psi (160 Bar) 1/4" Bottom Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp bottom entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-2300 psi ( 160 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £18.44
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Top Link Double Pilot Check Valve 1/2"BSP  50Lpm - Approved Hydraulics
    Regular price From £51.83
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Top Link Double Pilot Check Valve 1/2"BSP 50Lpm

    Key Features

    • Application: tractor top link cylinder load holding
    • Type: double pilot operated check
    • Port size: 1/2' bsp
    • Rated flow: 25 to 50 l/min options
    • Use: prevents drift ; allows controlled retraction on pilot
    Regular price From £51.83
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP Female Poppet Check Valve - Cracking Pressure 0.5 Bar - Approved Hydraulics Limited
    Regular price From £6.44
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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 £6.44
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Scanreco Cigarette Plug Adaptor 12V/24V - Approved Hydraulics Limited
    Regular price £49.82
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Scanreco Cigarette Plug Adaptor 12V/24V

    Key Features

    • Type: 12 ; 24 vdc cigarette lighter adaptor
    • Interface: vehicle plug to dc output lead
    • Use: power scanreco chargers or receiver accessories
    • Note: in vehicle accessory power connection
    • Protection: fused lead per adaptor design
    Regular price £49.82
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Solenoid Operated Diverter Valve, 3 Ways, 3/4" BSP, Open Centre (Various Voltage) - Approved Hydraulics Limited
    Regular price £86.46
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Stabiliser Leg Ram Cylinder 70 x 50 x 320 Stroke (Includes PO Check Valve)
    Regular price £396.06
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Stabiliser Leg Ram Cylinder 70 x 50 x 320 Stroke (Includes PO Check Valve)

    Key Features

    • Bore x rod x stroke: 70 x 50 x 320 mm
    • Integrated valve: Pilot operated check valve for load holding
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Use: Stabiliser legs ; outriggers ; props
    • Temperature range: -25 °C to +80 °C
    Regular price £396.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Clockwise Group 2 Tandem Hydraulic Pumps - Rear

    POA

    • All Items Guaranteed
    • Delivery to UK & Ireland

    Clockwise Group 2 Tandem Hydraulic Pumps - Rear

    Key Features

    • Type: group 2 tandem external gear pump
    • Displacement: 4.5 to 25 cc per rev per section
    • Rotation: clockwise
    • Mounting: 2 or 4 bolt flange per variant
    • Use: supply multiple circuits from one drive

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Hydra Part 1/2" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £347.56
    • All Items Guaranteed
    • Delivery to UK & Ireland

    1" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Max Inlet Flow: 200 Lpm
    • Max Adjusted Flow: 170 Lpm
    • Max Pressure: 350 Bar
    • Function: Pressure compensated flow control; regulates actuator speed
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    Regular price £347.56
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Clockwise Group 2 Tandem Hydraulic Pumps - Front
    Regular price £159.78
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Clockwise Group 2 Tandem Hydraulic Pumps - Front

    Key Features

    • Type: group 2 tandem external gear pump
    • Displacement: 4.5 to 25 cc per rev per section
    • Rotation: clockwise
    • Mounting: 2 or 4 bolt flange per variant
    • Use: supply multiple circuits from one drive
    Regular price £159.78
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Shop All Components

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.