• 80L Control Valve  D/acting spool, 3 posn (A & B closed in neutral) Type 1
    Regular price £29.28
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    80L Control Valve D/acting spool, 3 posn (A & B closed in neutral) Type 1

    Key Features

    • Series: 80L 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 £29.28
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  • 80L Control Valve Motor Spool (A & B Open In Neutral) Type 2
    Regular price £29.28
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    80L Control Valve Motor Spool (A & B Open In Neutral) Type 2

    Key Features

    • Series: 80L GS sectional control valve
    • Spool type: motor spool ; type 2
    • Neutral function: A & B open in neutral
    • Intended use: hydraulic motors ; freewheeling to avoid overrunning loads
    • Spool diameter: 18 mm
    • Section type: double acting working section compatible
    • Typical circuits: open centre ; closed centre with carry-over
    Regular price £29.28
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  • Hydra Part 90º Rotary Swivel Joint - Approved Hydraulics
    Regular price From £29.00
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    90º Rotary Swivel Joint

    Key Features

    • Type: 90 degree rotary swivel joint
    • Installation: between hose and rigid component
    • Function: allows occasional rotation ; reduces hose stress
    • Ports: bsp female sizes
    • Typical applications: hose routing on mobile plant
    Regular price From £29.00
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  • 45L & 50L Control Valve 4 Position Detent in posn 3) for spool 5DY Float Spool (G)
    Regular price £28.75
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    45L & 50L Control Valve 4 Position Detent in posn 3) for spool 5DY Float Spool (G)

    Key Features

    • Type: 4 position detent for 5dy float spool
    • Positions: neutral ; a ; float pos 3 ; b
    • Function: adds float detent in position 3
    • Compatibility: 45l ; 50l control valves
    • Use: loader lift ; blade float applications
    Regular price £28.75
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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.

  • 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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  • 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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  • 8L Plastic Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £28.46
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    8L Plastic Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 8 l
    • Neck flange: 120 mm dc
    • Material: plastic
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £28.46
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  • 50L Control Valve Double Acting Spool (Type 1)
    Regular price £28.43
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    50L Control Valve Double Acting Spool (Type 1)

    Key Features

    • Spool: double acting ; 3 positions (type 1)
    • Series: 50 l sectional valve
    • Neutral: A ; B closed in neutral
    • Use: bidirectional cylinder control
    • Application: hydraulic component
    Regular price £28.43
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  • 50L Control Valve Motor Spool (Type 2) - Approved Hydraulics Limited
    Regular price £28.43
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    50L Control Valve Motor Spool (Type 2)

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: motor spool ; type 2
    • Neutral function: A & B open in neutral
    • Intended use: hydraulic motors ; freewheeling to avoid overrunning loads
    • Section type: double acting working section compatible
    • Typical circuits: open centre ; closed centre with carry-over
    Regular price £28.43
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  • Hydra Part Poppet Check Valve 1" 180Lpm, 280 Bar Max Pressure - Approved Hydraulics
    Regular price £28.42
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    Poppet Check Valve 1" 180Lpm, 280 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 1' bsp
    • Max flow: 180 l/min
    • Max pressure: 280 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £28.42
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  • 45L - 50L Control Valve  Dual control connector Kit (8D2) (G-S)
    Regular price £28.39
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    45L - 50L Control Valve Dual control connector Kit (8D2) (G-S)

    Key Features

    • Type: 8d2 dual control connector
    • Function: allows two actuators to share one spool . e.g. lever and remote cable
    • Compatibility: 45l ; 50l control valves
    • Use: retain manual backup alongside remote control
    • Install: links two control inputs to one spool stem
    Regular price £28.39
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  • 45FW - 45L - 50L Control Valve Relief Valve Cartridge  20 - 315  Bar (G)
    Regular price £28.24
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    45FW - 45L - 50L Control Valve Relief Valve Cartridge 20 - 315 Bar (G)

    Key Features

    • Type: adjustable pressure relief cartridge
    • Set range: 20 ; 315 bar
    • Compatibility: 45fw ; 45l ; 50l valve families
    • Role: protects circuit by limiting pressure
    • Location: inlet or service port depending on model
    Regular price £28.24
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  • HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve - Approved Hydraulics Limited
    Regular price £28.21
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    HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve

    Key Features

    • Compatibility: HP50 monoblock control valve sections
    • Assembly: complete wet spool lever cap with lever hardware
    • Rated flow of valve: 50 l.min HP50 valve family
    • Seal type: wet armature design with O ring sealing
    • Use: service kit to replace damaged cap ; restores manual actuation
    Regular price £28.21
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  • Hydraulic Oil ISO 46, 5 Litres - Approved Hydraulics Limited
    Regular price £28.20
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    Hydraulic Oil ISO 46, 5 Litres

    Key Features

    • Viscosity grade: ISO VG 46
    • Type: Mineral anti-wear hydraulic oil ; HLP HM class
    • Performance: Oxidation stability ; anti-foam ; rust protection ; good demulsibility
    • Approvals: Meets DIN 51524-2 HLP ; ISO 11158 HM
    • Use: General purpose mobile and industrial hydraulics
    • Pack size: 5 Litres
    Regular price £28.20
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  • 32mm B Shaft For MP &  MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £28.18
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    32mm B Shaft For MP & MR Motors (ZHE)

    Key Features

    • Shaft type: Ø 32 mm parallel keyed output for MP ; MR motors
    • Key standard: DIN 6885 ; ISO R773
    • Key size: 10 x 8 mm typical for 30–38 mm shafts
    • Compatibility: fits M+S MP ; MR families with CB shaft codes
    • Use: service replacement shaft ; verify seal ; bearing diameters
    • Applications: general LSHT drives; conveyors; augers
    Regular price £28.18
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  • 1" Straight Keyed Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £28.18
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    1" Straight Keyed Shaft For MP And MR Motors (ZHE)

    Key Features

    • Shaft diameter: 1.000 in
    • Key standard: ANSI B17.1 parallel key
    • Key size: 1/4 in x 1/4 in typical for 1 in shaft
    • Compatibility: M+S MP ; MR orbital motor shaft interface
    • Use: replacement straight keyed shaft
    • Notes: verify keyway and seal kit against motor series and code
    Regular price £28.18
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  • Oil Level & Temperature Gauge (12mm)
    Regular price £27.96
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    Oil Level & Temperature Gauge (12mm)

    Key Features

    • Type: oil level ; temperature dual gauge
    • Probe: 12 mm mounting stud ; vertical tank installation
    • Scale: dial thermometer ; level mark window
    • Use: monitor reservoir level ; oil temperature
    • Material: aluminium ; polycarbonate sight
    Regular price £27.96
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  • 100L Control Valve Tie Rod Kit - 7 Bank (4 Rods / kit)   M10x1.5 x 417mm long - Approved Hydraulics Limited
    Regular price £27.96
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    100L Control Valve Tie Rod Kit - 7 Bank (4 Rods / kit) M10x1.5 x 417mm long

    Key Features

    • Kit: tie rods for 7 bank assembly . 4 rods per kit
    • Thread: m10x1.5
    • Rod length: 417 mm
    • Compatibility: 100l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £27.96
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  • 150L TIE ROD KIT (4 Rods / kit) 6 Bank M10x1.5 417mm long
    Regular price £27.83
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    150L TIE ROD KIT (4 Rods / kit) 6 Bank M10x1.5 417mm long

    Key Features

    • Valve size: 150l
    • Banks: 6 bank
    • Rod thread: 10x1.5
    • Rod length: 417 mm
    • Set: 4 tie rods per kit
    • Use: assemble sectional valve stack
    Regular price £27.83
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  • 150L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit) M10x1.5 x 366mm long - Approved Hydraulics Limited
    Regular price £27.83
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    150L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit) M10x1.5 x 366mm long

    Key Features

    • Series: 150L GS sectional control valve
    • Bank size: 5 bank
    • Length: 366 mm
    • Thread: M10x1.5
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £27.83
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  • 100L Control Valve Tie Rod Kit - 8 Bank (4 Rods / kit) M10x1.5 x 463 mm long
    Regular price £27.64
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    100L Control Valve Tie Rod Kit - 8 Bank (4 Rods / kit) M10x1.5 x 463 mm long

    Key Features

    • Series: 100L GS sectional control valve
    • Bank size: 8 bank
    • Length: 463 mm
    • Thread: M10x1.5
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £27.64
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  • Out of Stock
    Hydra Part Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm - Approved Hydraulics
    Regular price £27.44
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    Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm

    Key Features

    • Application: tractor top link cylinder load holding
    • Type: double pilot operated check
    • Port size: 1/4' bsp
    • Rated flow: 25 to 50 l/min options
    • Use: prevents drift ; allows controlled retraction on pilot
    Regular price £27.44
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  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £27.40
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    MR motor seal kit (ZI)

    Key Features

    • Compatibility: M+S MR series orbital motors series 3 ; series 4
    • Shaft seal: 28.56 x 42 x 5.5 mm NBR typical
    • Dust seal: 28.5 x 35 x 2 mm
    • O rings: 48 x 2 mm ; 90 x 2 mm x3
    • Purpose: restores sealing to reduce leakage and maintain pressure
    • Use: service kit for MR motor overhaul ; maintenance
    • Notes: check shaft code ZI ; different seals exist for ZH ; ZK variants
    Regular price £27.40
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  • 90L Monobloc Valve Motor Spool Type 2
    Regular price £27.36
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    90L Monobloc Valve Motor Spool Type 2

    Key Features

    • Valve: 90L monoblock ; motor spool type 2
    • Function: Spool for hydraulic motor circuits
    • Use: Continuous motor drive with return to tank in neutral
    • Additional info: See product data sheet for detailed measurements
    • Neutral condition: Ports A ; B open in neutral for freewheeling motors
    Regular price £27.36
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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.