• CETOP 3 Manual Override Cap (Screw Type) - Approved Hydraulics Limited
    Regular price £18.42
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    • Delivery to UK & Ireland

    CETOP 3 Manual Override Cap (Screw Type)

    Key Features

    • Type: manual override cap for cetop 3 valve
    • Interface: fits din 24340 ; iso 4401 03 valves
    • Style: screw type override
    • Use: manual operation for setup or emergency
    • Seal: o ring under cap
    • Material: steel or polymer head
    Regular price £18.42
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • M5 x 150 Cap head bolt - Approved Hydraulics Limited
    Regular price £2.21
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    • Delivery to UK & Ireland

    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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil – 220VAC-50HZ  (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    • Delivery to UK & Ireland

    CETOP 3 Coil – 220VAC-50HZ (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with correct DIN plug
    • Notes: ensure AC coil ; armature pairing per manufacturer
    Regular price £13.13
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  -24VDC Coil (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £14.41
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    CETOP 3 Coil -24VDC Coil (23mm Bore x 50mm long)

    Key Features

    • Voltage: 24 vdc
    • Bore: 23 mm
    • Length: 50 mm
    • Connection: din 43650 a
    • Use: cetop 3 solenoid valves
    Regular price £14.41
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    • 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.

  • M5 x 130 Cap head bolt - Approved Hydraulics Limited
    Regular price £3.66
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    • Delivery to UK & Ireland

    M5 x 130 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 130 mm
    • Drive: internal hex for controlled tightening
    • Use: hydraulic brackets; manifolds; guards
    Regular price £3.66
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • M5 x 140 Cap head bolt - Approved Hydraulics Limited
    Regular price £3.90
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    • Delivery to UK & Ireland

    M5 x 140 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: M5 (metric)
    • Length: 140 mm
    • Drive: internal hex for accurate tightening
    • Use: manifolds; brackets; pump/motor accessories
    Regular price £3.90
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    • Delivery to UK & Ireland

    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 £13.13
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • M5 x 120 Cap Head bolt
    Regular price £2.22
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    • Delivery to UK & Ireland

    M5 x 120 Cap Head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 120 mm
    • Drive: internal hex (Allen)
    • Use: hydraulic brackets; manifolds; general assemblies
    Regular price £2.22
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body
    Regular price £96.24
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    • Delivery to UK & Ireland

    Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - 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 £96.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • M5 x 110 CAP head bolt
    Regular price £2.22
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    • Delivery to UK & Ireland

    M5 x 110 CAP head bolt

    Key Features

    • Thread: metric M5
    • Length: 110 mm
    • Head: socket cap
    • Material: high tensile steel (typical)
    • Use: hydraulic assemblies; brackets; adapters
    • Drive: internal hex for controlled tightening
    Regular price £2.22
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

CETOP 3 Spares

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.