• CETOP 3 Manual Override Cap (Screw Type) - Approved Hydraulics Limited
    Regular price £19.34
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    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 £19.34
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  • Out of Stock
    Hydra Part CETOP 3 Modular Flow Control Valve (Z2FDS-6-30-S2) - Approved Hydraulics
    Regular price £61.30
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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 £61.30
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  • Hydra Part CETOP 3 Modular Pilot Operated Check Valve on A & B (Z2DS-6) - Approved Hydraulics
    Regular price £58.38
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    CETOP 3 Modular Pilot Operated Check Valve on A & B (Z2DS-6)

    Key Features

    • Valve type: Pilot operated check valve modular sandwich; locks A and B work ports
    • Interface: CETOP 3 / NG6; ISO 4401-03-02-0-94; DIN 24340-A6
    • Max operating pressure: 315 bar on P; A; B ports; 160 bar on T port
    • Max flow: 60 L/min
    • Pilot ratio: 3/1
    • Construction: Steel body; phosphate coated surface
    • Seal options: NBR; FKM/Viton options
    • Temperature range: -30 to +80 °C (NBR); -20 to +120 °C (FKM/Viton)
    • Fluid compatibility: Mineral oils HM/HV; viscosity 20-400 mm²/s; recommended 30-80 mm²/s
    • Cleanliness: Recommended ISO 4406 class 21/18/15 (1999)
    Regular price £58.38
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  • Hydra Part CETOP 3 Modular Pressure Relief Valve - P to T - (ZPB-6-VP-1-315) - Approved Hydraulics
    Regular price £86.32
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    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 £86.32
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  • Team Member

    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 Pilot Operated Relief Valve Module - (Z-2-PB-6-VC-1-315) - Approved Hydraulics
    Regular price £145.82
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    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 £145.82
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  • Hydra Part CETOP 3 Pressure Reducing Module - A to T (ZPR-6-D-A-1-30-210YM) - Approved Hydraulics
    Regular price £79.49
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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 £79.49
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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 £93.35
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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 £93.35
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    • 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 £79.49
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    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 £79.49
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  • Hydra Part CETOP 3 Single Solenoid Control Valve NG06 - P to A & B to T (X - 11) - Approved Hydraulics
    Regular price £56.16
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    CETOP 3 Single Solenoid Control Valve NG06 - P to A & B to T (X - 11)

    Key Features

    • Centre spool: p to a ; b to t
    • 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 £56.16
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  • Hydra Part CETOP 3 single solenoid control valve NG06 All ports connected to X - Approved Hydraulics
    Regular price £56.28
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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 £56.28
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 single solenoid control valve NG06 P to A  B & T blocked - Approved Hydraulics
    Regular price From £56.16
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    CETOP 3 single solenoid control valve NG06 P to A B & T blocked

    Key Features

    • Centre spool: p to a ; b and t blocked
    • 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 From £56.16
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    • Order by 3pm for Next Day Delivery
  • CETOP 3 Stackable Valve Mounting Manifold For AC 500050-2   - 3/8" Side Ports - Approved Hydraulics Limited
    Regular price £25.23
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    CETOP 3 Stackable Valve Mounting Manifold For AC 500050-2 - 3/8" Side Ports

    Key Features

    • Standard: cetop 3 ; iso 4401-03
    • Side ports: 3/8" bspp
    • Use: stack mounts on ac central manifold 500050-2
    • Function: connects directional valve stack to external pipework
    • Applications: multi station valve assemblies on power packs
    Regular price £25.23
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  • CETOP 3 Steel Manifold with Relief Cavity - P&T 1/2" - A&B 3/8" - Approved Hydraulics Limited
    Regular price From £45.13
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    CETOP 3 Steel Manifold with Relief Cavity - P&T 1/2" - A&B 3/8"

    Key Features

    • Standard: cetop 3 ; iso 4401-03 ; din 24340
    • Ports: p ; t 1/2" bspp ; a ; b 3/8" bspp
    • Relief cavity: main pressure relief cavity provided ; blanking plug when no cartridge
    • Max working pressure: 315 bar
    • Circuit: parallel
    • Stations: 1 ; 2 ; 3 ; 4 ; 5 ; 6 options
    • Material: steel
    • Use: mounting of ng6 directional valves on mini power packs ; manifolds
    Regular price From £45.13
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    • Order by 3pm for Next Day Delivery
  • CETOP 3 Steel Manifold with Relief Cavity - P&T 1/2" - A&B 3/8" - Approved Hydraulics Limited
    Regular price From £70.92
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    CETOP 5 - Steel Manifold with Relief Cavity - P&T 3/4" - A&B 1/2"

    Key Features

    • Standard: cetop 5 ; iso 4401-05 ; ng10
    • Ports: p ; t 3/4" bspp ; a ; b 1/2" bspp
    • Relief cavity: main pressure relief cavity provided ; blanking plug when no cartridge
    • Max working pressure: 315 bar
    • Circuit: parallel
    • Stations: 1 ; 2 ; 3 ; 4 ; 5 ; 6 options
    • Material: steel
    • Use: mounting of ng10 directional valves ; high flow manifolds
    Regular price From £70.92
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 5 Coil  - 110VAC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £25.98
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    CETOP 5 Coil - 110VAC, (31mm Bore x 75mm long)

    Key Features

    • Valve size: CETOP 5 ; ISO 4401-05
    • Voltage: 110 VAC 50.60 Hz
    • Core ; length: Ø 31 mm bore ; 75 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with proper DIN plug
    • Duty: continuous service ; wet armature compatible
    Regular price £25.98
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  • CETOP 5 Coil  - 12VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £28.50
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    CETOP 5 Coil - 12VDC, (31mm Bore x 75mm long)

    Key Features

    • Part number: HP-31-75-COIL-12VDC
    • Valve standard: CETOP 5 / NG10 solenoid coil for directional control valves
    • Supply voltage: 12 VDC
    • Coil bore: 31 mm armature tube bore
    • Coil length: 75 mm overall length
    • Electrical connection: Typically via DIN 43650 / EN 175301-803 plug
    • Function: Energises solenoid valve to shift spool for flow direction control
    • Typical use: Mobile hydraulics; manifolds; power packs
    Regular price £28.50
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 5 Coil  - 220VAC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £25.98
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    • Delivery to UK & Ireland

    CETOP 5 Coil - 220VAC, (31mm Bore x 75mm long)

    Key Features

    • Valve size: CETOP 5 ; ISO 4401-05
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 31 mm bore ; 75 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with proper DIN plug
    • Notes: match coil ; armature to valve make
    Regular price £25.98
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    • Order by 3pm for Next Day Delivery
  • CETOP 5 Coil  - 24VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £28.50
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    CETOP 5 Coil - 24VDC, (31mm Bore x 75mm long)

    Key Features

    • Interface: CETOP 5
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £28.50
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    • 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 £114.26
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    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 £114.26
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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 £114.26
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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 £114.26
    • 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 £106.97
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    • 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 £106.97
    • 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 £120.56
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    • 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 £120.56
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 5 Manifolds - P & T 3/4" - A & B 1/2" - Approved Hydraulics Limited
    Regular price From £85.37
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    CETOP 5 Manifolds - P & T 3/4" - A & B 1/2"

    Key Features

    • Type: cetop 5 ng10 manifold
    • Interface: iso 4401 05 pattern
    • Ports: p ; t 3/4" bsp ; a ; b 1/2" bsp
    • Mounting: 4 hole on industry mm pcd
    • Use: mount ng10 valves to pipework
    Regular price From £85.37
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    • Order by 3pm for Next Day Delivery
  • Cetop 5 Manual Overide Cap - Approved Hydraulics Limited
    Regular price £23.38
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    • Delivery to UK & Ireland

    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 £23.38
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    • Order by 3pm for Next Day Delivery

All for Professional Hydraulic Applications

Discover quality all from Approved Hydraulics, trusted by professionals across construction, transport, forestry, agriculture and industrial sectors. Built for demanding working environments, our range offers dependable performance, durable construction and trusted reliability. Whether you are replacing existing parts or specifying components for a new build, our experienced team can help you find the right product. With fast UK delivery and expert technical support, Approved Hydraulics supplies hydraulic equipment you can rely on.

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.