• ADMISSION CONNECTOR 1"1/4 PIPE 2" ELBOW 45º
    Regular price £41.18
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    ADMISSION CONNECTOR 1"1/4 PIPE 2" ELBOW 45º

    Key Features

    • Connections: 1 1/4" pipe to 2" elbow
    • Elbow angle: 45°
    • Intended use: pump admission / suction line
    • Design: angled elbow aids routing in confined spaces
    • Compatibility: ABER pump suction fittings
    Regular price £41.18
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  • GASKET ZF (0,5MM) - 4 BOLT
    Regular price £1.36
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    GASKET ZF (0,5MM) - 4 BOLT

    Key Features

    • Type: ZF PTO / pump interface gasket
    • Thickness: 0.5 mm
    • Pattern: 4-bolt mounting
    • Function: seals gearbox-to-PTO or PTO-to-pump interface
    • Service note: replace whenever PTO/pump is removed
    • Benefit: prevents oil leakage and maintains system integrity
    Regular price £1.36
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  • Tooth Holder Bolt
    Regular price £1.32
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    Tooth Holder Bolt

    Key Features

    • System: stump grinder tooth holder fastener
    • Head: socket/hex drive for controlled torque
    • Material: high tensile steel with anti-corrosion finish
    • Purpose: secures tooth holder to cutter wheel
    • Service: replace when threads or head show wear
    Regular price £1.32
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  • Double cross relief valve 60L 1/2 BSPP 210 bar - steel body for OMP or OMR Hydraulic motors - Approved Hydraulics Limited
    Regular price £51.64
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    Double cross relief valve 60L 1/2 BSPP 210 bar - steel body for OMP or OMR Hydraulic motors

    Key Features

    • Type: double cross-line relief valve for hydraulic motors
    • Ports: 1/2 BSPP
    • Flow rating: per model
    • Max pressure: 210 bar
    • Compatibility: direct fit for Danfoss OMP/OMR style motors
    • Function: protects motor from shock and overpressure on both A/B lines
    • Body: steel; zinc plated
    Regular price £51.64
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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.

  • Padlock for Pad Cages
    Regular price £3.06
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    Padlock for Pad Cages

    Key Features

    • Model: PADCAGE-PADLOCK-20MM
    • Purpose: locking pad for stabiliser pad storage cage systems
    • Security level: moderate site security
    • Use: secures cage door during storage and transport
    • Material: hardened shackle with compact body
    Regular price £3.06
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  • Cetop 5 Manual Overide Cap
    Regular price £22.26
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    Cetop 5 Manual Overide Cap

    Key Features

    • Interface: cetop 5 ; ng10 valve
    • Function: manual override cap for solenoid operator
    • Install: screws on actuator end
    • Use: manual actuation during service or power loss
    • Application: hydraulic system component
    Regular price £22.26
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  • MR motorcover used on 32mm shaft conversion - Approved Hydraulics Limited
    Regular price £10.26
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    MR motorcover used on 32mm shaft conversion

    Key Features

    • Component: motor cover for MR motor 32 mm shaft conversion
    • Function: protects front seal area and bearing alignment
    • Use: fitted during conversion to 32 mm shaft
    • Benefit: clean finish and debris protection
    • Compatibility: MR series housings
    Regular price £10.26
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  • 15cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain
    Regular price £171.06
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    15cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain

    Key Features

    • Displacement: 15 cc/rev
    • Group: group 2 external gear motor
    • Mount: 4 bolt european
    • Shaft: 1.8 taper keyed
    • Ports: inlet/outlet 3/4" bspp ; case drain 1/4" bspp
    • Working pressure: 250 bar class
    • Rotation: reversible cw ; ccw
    • Use: winch ; conveyor ; flail head drive
    Regular price £171.06
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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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  • 3/4 BSPP Relief Valve - 80 l/min - 50/350 bar - Steel Body
    Regular price £44.22
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    3/4 BSPP Relief Valve - 80 l/min - 50/350 bar - Steel Body

    Key Features

    • Type: pressure relief valve; direct line mounting
    • Ports: 3/4 BSPP
    • Max flow: 80 L/min
    • Adjustable range: 50–350 bar
    • Function: protects circuit by limiting pressure to setpoint
    • Body: steel with corrosion-resistant plating
    Regular price £44.22
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  • BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body
    Regular price From £47.20
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    BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body

    Key Features

    • Type: single acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price From £47.20
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  • BSPP Double Acting Counterbalance Valve for Open Centre with Steel Body
    Regular price From £73.04
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    BSPP Double Acting Counterbalance Valve for Open Centre with Steel Body

    Key Features

    • Type: double acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price From £73.04
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    • Order by 3pm for Next Day Delivery
  • 8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit
    Regular price £90.29
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    8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit

    Key Features

    • Kit: pneumatic actuation for sectional control valves
    • Compatibility: 80 l ; 90 l ; 100 l ; 120 l ; 150 l control valves
    • Supply: compressed air 6 ; 10 bar typical
    • Contents: cylinders ; brackets ; hoses ; fittings
    • Use: remote spool operation from cab or pendant
    Regular price £90.29
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  • Tamper proof cap M10 - RED color
    Regular price £1.28
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    Tamper proof cap M10 - RED color

    Key Features

    • Type: tamper-proof cap for valve adjusters
    • Thread: M10
    • Colour: red for quick identification
    • Function: prevents unauthorised adjustment
    • Material: durable polymer or plated steel per variant
    Regular price £1.28
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  • Knob Model 1052/M d. 40 M10x30
    Regular price £2.47
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    Knob Model 1052/M d. 40 M10x30

    Key Features

    • Diameter: 40 mm
    • Thread: m10 stud
    • Stud length: 30 mm
    • Grip: round knob; ribbed edge
    • Material: thermoplastic knob; steel stud
    • Use: panel; lever; valve actuation handle
    Regular price £2.47
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    • Order by 3pm for Next Day Delivery
  • ABER Side Mounting Steel Tank; Long Optical Level; With Oil return Filter
    Regular price From £426.06
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    ABER Side Mounting Steel Tank; Long Optical Level; With Oil return Filter

    Key Features

    • Mounting: side mounting with belts/brackets
    • Material: steel construction
    • Oil level: long optical level gauge
    • Filler-breather: cap with integral air filter
    • Return filtration: tank-top return filter (single)
    • Suction port: 1 1/2" BSP (TSB family)
    • Capacity range: ~80–250 litres (TSB series)
    • Construction: ~2 mm plate with robotic welded seams
    Regular price From £426.06
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  • 3/8 BSPP Sequence Valve - 40 L/Min - 70/350 Bar - Steel Body
    Regular price From £45.21
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    3/8 BSPP Sequence Valve - 40 L/Min - 70/350 Bar - Steel Body

    Key Features

    • Type: line-mounted sequence valve for staged actuation
    • Ports: 3/8 BSPP
    • Flow rating: 40 L/min
    • Pressure range: 70–350 bar adjustable
    • Operation: direct acting; fully balanced poppet design
    • Body: steel body for durability
    • Use: start secondary function only after primary reaches set pressure
    Regular price From £45.21
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    • Order by 3pm for Next Day Delivery
  • Double Acting Pilot Check Valves
    Regular price From £44.88
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    • Delivery to UK & Ireland

    Double Acting Pilot Check Valves

    Key Features

    • Function: locks cylinder in position until piloted open
    • Ports: 1/4" ; 3/8" ; 1/2" bspp options
    • Pilot ratio: 3.1 ; 4.1 options
    • Cracking pressure: 3 ; 5 bar typical
    • Use: load holding on da cylinders
    • Mounting: in line block
    Regular price From £44.88
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  • 1/2-3/8 BSPP Flow Divider 15-40  L/Min - 210 Bar
    Regular price £126.73
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    1/2-3/8 BSPP Flow Divider 15-40 L/Min - 210 Bar

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 3/8 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 £126.73
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  • DIN 3/8 BSPP Double Acting Pilot Check Valve - Pipe12 - Approved Hydraulics Limited
    Regular price £22.07
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    DIN 3/8 BSPP Double Acting Pilot Check Valve - Pipe12

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 3/8 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 £22.07
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSPP Double Acting Pilot Check Valve - Approved Hydraulics Limited
    Regular price £21.17
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    1/4 BSPP Double Acting Pilot Check 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 £21.17
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    • 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
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    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
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8 BSPP bi-directional flow control valve - Approved Hydraulics Limited
    Regular price £18.04
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    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2 BSPP Three-Way Flow Control Valve - Pressure Compensated - Exceending Flow To Pressure - Approved Hydraulics Limited
    Regular price £149.23
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    1/2 BSPP Three-Way Flow Control Valve - Pressure Compensated - Exceending Flow To Pressure

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/2 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 £149.23
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    • 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.