• 1" Male Female Tipper Quick Release  Coupling (Set) - Approved Hydraulics Limited
    Regular price £62.22
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    1" Quick Release Coupling (Screw Type, Male)

    Key Features

    • Type: screw to connect quick release coupling male
    • Port size: 1"
    • Benefit: connects under residual pressure
    • Use: high pressure attachments and tools
    • Standard: screw to connect design
    • Pressure: high impulse rated per series
    Regular price £62.22
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    • Order by 3pm for Next Day Delivery
  • 50L Control Valve (Right inlet) Section c/w Relief Valve (BC)
    Regular price £62.14
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    50L Control Valve (Right inlet) Section c/w Relief Valve (BC)

    Key Features

    • Series: 50L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £62.14
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90LS & 90L Single Microswitch Kit  (Req's switch N/O 30075320 or N/C 20010687 extra as needed - Not included)
    Regular price £61.56
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    90LS & 90L Single Microswitch Kit (Req's switch N/O 30075320 or N/C 20010687 extra as needed - Not included)

    Key Features

    • Part number: 30075562
    • Compatibility: 90LS; 90L valve families; also 45L; 50L; 80L; 100L; 150L
    • Kit type: Single microswitch mounting kit for control valve
    • Switch required: Requires N/O 30075320 or N/C 20010687 microswitch; not included
    • Function: Provides electrical signal based on spool position or actuation
    • Typical use: Indicators; interlocks; automation on hydraulic control levers
    Regular price £61.56
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    • Order by 3pm for Next Day Delivery
  • 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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  • 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.

  • 90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated
    Regular price £60.74
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    90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated

    Key Features

    • Ports: G 3/8 BSPP
    • Function: 90 deg elbow flow regulator with check valve
    • Compensation: pressure compensated A->B ; free reverse via check
    • Max flow A->B: 30 l.min typical at 3/8 size
    • Max pressure: 250 bar
    • Body: zinc plated steel ; alloy handknob
    • Applications: speed control of cylinder or motor in one direction
    Regular price £60.74
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  • 1" Male Female Tipper Quick Release  Coupling (Set) - Approved Hydraulics Limited
    Regular price £59.82
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    • Delivery to UK & Ireland

    1" Quick Release Coupling (Screw Type, Female)

    Key Features

    • Type: screw to connect quick release coupling female
    • Port size: 1"
    • Benefit: high resistance to pressure spikes
    • Use: high pressure attachments ; hammer circuits
    • Standard: screw to connect design
    • Pressure: high impulse rated per series
    Regular price £59.82
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    • Order by 3pm for Next Day Delivery
  • MINI Power Pack  0.75 cc/r  Grp 1 pump - Approved Hydraulics Limited
    Regular price £59.00
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    MINI Power Pack 0.75 cc/r Grp 1 pump

    Key Features

    • Pump group: group 1 external gear pump
    • Displacement: 0.75 cc/rev
    • Rotation: ccw
    • Use: mini hydraulic power pack builds
    • Compatibility: b14 mounting kits ; group 1 couplings
    Regular price £59.00
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    • Order by 3pm for Next Day Delivery
  • 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 3/4" 3 port manual diverter valve (open centre) - Approved Hydraulics
    Regular price £58.10
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    3/4" 3 port manual diverter valve (open centre)

    Key Features

    • ["Port size: 3/4" bsp"
    • Configuration: 3 port ; open centre
    • Nominal flow: 100 lpm
    • Max pressure: 250 bar
    • "Function: manual rotary diverter for circuit selection"]
    Regular price £58.10
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  • Out of Stock
    80L Control Valve Tank Section (Type TC) (Old ref 30085660) - Approved Hydraulics Limited
    Regular price £57.85
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    100L GS Tank Section

    Key Features

    • Function: tank return section for GS sectional valve
    • Series: 100l family
    • Purpose: returns oil from valve stack to reservoir
    • Mounting: fits in sectional stack via tie rods
    • Typical use: end section to complete return path
    • Compatibility: 100l GS sectional components
    Regular price £57.85
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    • Order by 3pm for Next Day Delivery
  • 2" BSP Male-Male Adaptor - Approved Hydraulics Limited
    Regular price £57.80
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    2" BSP Male-Male Adaptor

    Key Features

    • Type: Male to male BSP adaptor
    • Thread size: 2" BSPP or BSPT depending on variant
    • Material: Steel or brass per build
    • Standards: Threads to BS EN ISO 228 ; DIN 3852 form A
    • Use: Join two female BSP ports ; hose or manifold interface
    Regular price £57.80
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  • Hydra Part Top Link Double Pilot Check Valve 1/2"BSP  50Lpm - Approved Hydraulics
    Regular price From £57.01
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    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 £57.01
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  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/4" Rear Entry - Approved Hydraulics
    Regular price £56.62
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    63mm Glycerine Hydraulic Pressure Gauge 0-3500 Psi (250 Bar) 1/4" Rear Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-3500 psi ( 250 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £56.62
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    • Order by 3pm for Next Day Delivery
  • 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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    • Delivery to UK & Ireland
    • 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
  • 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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    • Delivery to UK & Ireland

    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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L Monobloc Valve 2 Axis Mechanical Joystick Kit (LCB) - Approved Hydraulics Limited
    Regular price £55.18
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    • Delivery to UK & Ireland

    45L Monobloc Valve 2 Axis Mechanical Joystick Kit (LCB)

    Key Features

    • Type: 2 axis mechanical joystick . lcb layout
    • Compatibility: Hydra Part 45L monobloc valve series
    • Function: controls two spools with cross pattern motion
    • Use: loaders ; cranes ; attachments
    • Integration: mechanical linkages and brackets included
    Regular price £55.18
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Steel Square Vertical Hydraulic Tank 123mm (AC) Neck Flange (Vertical & Horizontal) - Approved Hydraulics Limited
    Regular price From £55.12
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    Steel Square Vertical Hydraulic Tank 123mm (AC) Neck Flange (Vertical & Horizontal)

    Key Features

    • Material: steel
    • Neck flange: 123 mm ac
    • Orientation: vertical ; horizontal use
    • Use: reservoir for ac mini power packs
    • Compatibility: 123 mm filler ; breather ; central manifold
    Regular price From £55.12
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  • 90L - 100L - 150L Control Valve mechanical Joystick 2 x Axis (LCB)
    Regular price £55.07
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    • Delivery to UK & Ireland

    90L - 100L - 150L Control Valve mechanical Joystick 2 x Axis (LCB)

    Key Features

    • Series: 90L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £55.07
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 3 Way High Pressure Ball Valves - Approved Hydraulics
    Regular price From £54.58
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    3 Way High Pressure Ball Valves

    Key Features

    • Type: 3 way high pressure ball valve
    • Body: zinc plated steel
    • Seals: buna n ; pom
    • Function: diverts inlet to port a or b by lever selection
    • Typical ports: bsp thread options
    Regular price From £54.58
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  • 50L Control Valve Service port & anti caitation valve for 50L GS08 Series (0-300 BAR) - Approved Hydraulics Limited
    Regular price £54.23
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    • Delivery to UK & Ireland

    50L Control Valve Service port & anti caitation valve for 50L GS08 Series (0-300 BAR)

    Key Features

    • Series: 50L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £54.23
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Tank Section (Type TC) (Old ref 30085660) - Approved Hydraulics Limited
    Regular price £53.81
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    • Delivery to UK & Ireland

    80L Control Valve Tank Section (Type TC) (Old ref 30085660)

    Key Features

    • Section type: tank/outlet section (tc)
    • Compatibility: 80l gs sectional control valve
    • Function: provides main return to tank port for the valve stack
    • Old reference: 30085660
    • Typical circuits: open centre with optional carry over porting
    Regular price £53.81
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    • Order by 3pm for Next Day Delivery
  • Dual Pilot Operated Check Valve 1/4"BSP In Line - 20Lpm - Approved Hydraulics Limited
    Regular price £52.99
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    Dual Pilot Operated Check Valve 1/4"BSP In Line - 20Lpm

    Key Features

    • Type: double pilot operated check valve inline
    • Port size: 1/4' bsp
    • Function: locks cylinder in both directions until pilot pressure applied
    • Typical max pressure: up to 300 to 350 bar
    • Typical cracking: 0.5 bar check with pilot release
    Regular price £52.99
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 45L - 50L Control Valve Microswitch Kit (Request NO or NC as needed) (G-S) - Approved Hydraulics Limited
    Regular price £52.75
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    • Delivery to UK & Ireland

    45L - 50L Control Valve Microswitch Kit (Request NO or NC as needed) (G-S)

    Key Features

    • Function: single microswitch kit for spool position sensing
    • Compatibility: 45l ; 50l control valves
    • Switch types: normally open ; normally closed options
    • Use: auxiliary electrical signal for interlocks or lights
    • Mounting: fits spring cap positioner hardware
    Regular price £52.75
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Hydra Part for Professional Hydraulic Applications

Discover quality hydra part 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. Browse related products including lever operated monoblock valves, cetop 3 spares, scanreco spares accessories, scanreco to find the right solution for your hydraulic system. 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.