• 150L Control Valve Motor Spool (Type 2)
    Regular price £44.57
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    150L Control Valve Motor Spool (Type 2)

    Key Features

    • Spool type: motor spool type 2
    • Application: hydraulic motors with bi directional control
    • Behavior: neutral suited to motor coast down
    • Compatibility: 150l valve family
    • Positions: 3 position ; spring return to neutral
    Regular price £44.57
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  • Out of Stock
    Hydra Part Inline Pressure Relief Valve 1/2" Bsp 80Lpm 350 Bar Max - Approved Hydraulics
    Regular price From £44.16
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    Inline Pressure Relief Valves 1/2" BSP 70-80Lpm

    Key Features

    • Port size: 1/2' bsp
    • Max flow: 70 to 80 l/min
    • Adjustment range: 5 to 50 bar ; 100 to 350 bar options
    • Max working pressure: 350 bar
    • Use: line mounting system overpressure protection
    Regular price From £44.16
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  • 80L-90L-100L-120L-150L control valve Detent Kit (9B)  Detent In A Position
    Regular price £43.92
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    80L-90L-100L-120L-150L control valve Detent Kit (9B) Detent In A Position

    Key Features

    • Function: Detent in A position ; positions 0 and B spring centered
    • Kit code: 9B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full A
    • Additional info: See product data sheet for detailed measurements
    Regular price £43.92
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  • 10L Steel Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £43.74
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    10L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 10 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £43.74
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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.

  • 10L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £43.74
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    10L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 10 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £43.74
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  • 4 Button Pendant Control With 4 Mt Cable For 2 x Double Acting Valve Units
    Regular price £43.20
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    4 Button Pendant Control With 4 Mt Cable For 2 x Double Acting Valve Units

    Key Features

    • Functions: 4 on ; off pushbuttons
    • Supply: 12 ; 24 VDC
    • Harness: 4m prewired lead
    • Use case: simple on ; off control of one or two double acting functions
    • Applications: tippers ; winches ; auxiliary hydraulic functions
    Regular price £43.20
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  • Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/2" Rear Entry - Approved Hydraulics
    Regular price £42.86
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    100mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/2" Rear Entry

    Key Features

    • Dial: 100 mm
    • Filling: glycerine filled
    • Entry: 1/2\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-6000 psi ( 400 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £42.86
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  • 45L - 50L Control Valve Hydraulic Proportional Pilot spool control Kit (81M) (G)
    Regular price £42.72
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    45L - 50L Control Valve Hydraulic Proportional Pilot spool control Kit (81M) (G)

    Key Features

    • Type: 81m hydraulic proportional pilot kit
    • Function: pilot pressure module for proportional spool control
    • Compatibility: 45l ; 50l control valves
    • Use: interface to remote electro hydraulic servo modules
    • Advantage: smoother low speed control vs direct lever
    Regular price £42.72
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  • 18L Plastic Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £42.59
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    18L Plastic Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 18 l
    • Neck flange: 123 mm ac
    • Material: plastic
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £42.59
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  • 18L Plastic Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £42.59
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    18L Plastic Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 18 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 £42.59
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  • 90LS & 90L Single Microswitch Kit  (Req's switch N/O 30075320 or N/C 20010687 extra as needed - Not included)
    Regular price £42.58
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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

    • Function: Single microswitch to detect spool actuation
    • Compatibility: 90L ; 90LS control valves
    • Contacts: N/O or N/C switch options required separately
    • Use: Electrical signal for interlocks ; indicators
    • Additional info: See product data sheet for detailed measurements
    Regular price £42.58
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  • 8L Steel Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £42.38
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    8L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 8 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £42.38
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 8L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £42.38
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    8L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 8 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £42.38
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 1/2" 3 port manual diverter valve (open centre) - Approved Hydraulics
    Regular price £42.31
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    1/2" 3 port manual diverter valve (open centre)

    Key Features

    • Ports: 1/2' bsp 3 way ; 2 position
    • Centre: open centre
    • Nominal flow: 90 l/min
    • Max pressure: 300 bar
    • Body: carbon steel ; blow out proof stem
    • Use: switch flow between two circuits
    Regular price £42.31
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  • 160LGM Motor Spool
    Regular price £41.84
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    160LGM Motor Spool

    Key Features

    • Spool type: motor spool
    • Valve size: 160 l/min
    • Function: open centre with relief ; anti-cavitation checks typical
    • Use: hydraulic motors ; winch ; conveyor
    • Application: hydraulic system component
    Regular price £41.84
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  • CETOP 3 Aluminium Manifolds - P & T 1/2" - A & B 3/8" - Approved Hydraulics Limited
    Regular price From £41.57
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    CETOP 3 Aluminium Manifolds - P & T 1/2" - A & B 3/8"

    Key Features

    • Interface: iso 4401-03 cetop 3
    • Ports: p ; t 1/2\" ; a ; b 3/8\"
    • Max flow: 40 lpm
    • Max pressure: 315 bar
    • Type: aluminium manifold ; subplate
    Regular price From £41.57
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  • Normally Open Catridge with Manual Overide Button
    Regular price £40.94
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    Normally Open Catridge with Manual Overide Button

    Key Features

    • Valve type: 2/2 poppet normally open
    • Manual override: push button
    • Cavity: sae 08 ; 3/4-16 unf
    • Pressure: up to 350 bar class
    • Flow: up to ~40 l/min class
    • Coil options: 12 vdc ; 24 vdc
    Regular price £40.94
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  • 80L Control Valve Type H Spool (Dead Man Lever) For 80W010047 Body Section - Approved Hydraulics Limited
    Regular price £40.88
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    80L Control Valve Type H Spool (Dead Man Lever) For 80W010047 Body Section

    Key Features

    • Series: 80L GS sectional control valve
    • Spool type: type H ; dead-man lever return
    • Safety feature: spring return to neutral when released
    • Use case: safety critical actuation ; hold-to-run
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £40.88
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  • Hydra Part Flow Regulator Valves with Check (Uni-directional) - Approved Hydraulics
    Regular price From £40.56
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    Flow Regulator Valves with Check (Uni-directional)

    Key Features

    • Type: uni directional flow regulator with check
    • Function: meter in one direction ; free flow via check in reverse
    • Ports: bsp sizes
    • Typical sizes: 1/4" ; 3/8" ; 1/2"
    • Use: control actuation speed in one direction
    Regular price From £40.56
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  • 45L-50L Control Valve Pneumatic Kit (8P) (G) - Approved Hydraulics Limited
    Regular price £40.50
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    45L-50L Control Valve Pneumatic Kit (8P) (G)

    Key Features

    • Actuation: pneumatic cylinder kit for remote spool operation
    • Compatibility: 45l ; 50l control valves
    • Use case: enables air control from cab or panel
    • Integration: works with 3/2 electro pneumatic valves in 8ep3 ; 8ep4 systems
    • Benefit: isolates operator from hydraulic leaks ; improves ergonomics
    Regular price £40.50
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  • 90L-120L-100L-150L control valve  (8D2) Dual control spool connector Kit
    Regular price £40.32
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    90L-120L-100L-150L control valve (8D2) Dual control spool connector Kit

    Key Features

    • Function: Dual control spool connector
    • Kit code: 8D2
    • Compatibility: 90L ; 100L ; 120L ; 150L valves
    • Use: Mechanically link two control inputs to one spool
    • Additional info: See product data sheet for detailed measurements
    Regular price £40.32
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  • 80L- 90L- 100L - 120L Control Valve Relief Cart 20- 315 BAR - Approved Hydraulics Limited
    Regular price £39.90
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    80L- 90L- 100L - 120L Control Valve Relief Cart 20- 315 BAR

    Key Features

    • Type: adjustable pressure relief cartridge
    • Set range: 20 ; 315 bar
    • Compatibility: 80l ; 90l ; 100l ; 120l ; 150l ; 160l valve families
    • Role: protects circuit by limiting inlet or service port pressure
    • Use: maintenance replacement for OEM cartridge
    Regular price £39.90
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £39.05
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    Cylinder Seal kit 40-80/90 series 205/305/405/505/593/612/632/642/651

    Key Features

    • Compatibility: Hydra Part cylinder series 205 ; 305 ; 405 ; 505 ; 593 ; 612 ; 632 ; 642 ; 651
    • Bore sizes: 40 ; 50 ; 63 ; 70 ; 80/90 mm
    • Intended use: service kit for resealing listed series cylinders to prevent leakage and drift
    • Typical kit contents: rod seal ; piston seal ; wiper ; backup rings and o rings as required
    • Applications: mobile hydraulic cylinders across ag ; municipal and light construction machinery
    • Selection note: match series and bore markings to ensure compatibility across the variant list
    Regular price £39.05
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  • Normally Closed Catridge for SA Power Pack - Approved Hydraulics Limited
    Regular price £39.00
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    Normally Closed Catridge for SA Power Pack

    Key Features

    • Valve type: 2/2 poppet normally closed
    • Cavity: sae 08 ; 3/4-16 unf
    • Use: single acting power pack hold load
    • Coil options: 12 vdc ; 24 vdc
    • Manual override: available variants
    Regular price £39.00
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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.