• ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings - Approved Hydraulics Limited
    Regular price £101.12
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    ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings

    Key Features

    • Mounting interfaces: PTO EN.ISO 4 bolt to UNI 3 bolt
    • Integrated bearing: one ball bearing
    • Max torque: 315 N.m
    • Max power at 1000 rpm: 33 kW
    • Use case: fit UNI 3 bolt pumps to ISO 4 bolt PTO housings
    • Construction: steel adaptor with precision machining
    • Accessories: studs ; gaskets available in kits
    Regular price £101.12
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  • Cetop 5 Manual Overide Cap - Approved Hydraulics Limited
    Regular price £23.38
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    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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  • Group 2 Gear Motor 14cc/Rev , Euro Flange, 1:8 tpr Shaft, Reversible - Approved Hydraulics Limited
    Regular price £148.86
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    Group 2 Gear Motor 14cc/Rev , Euro Flange, 1:8 tpr Shaft, Reversible

    Key Features

    • Motor series: Group 2 gear motor
    • Displacement: 14 cc.rev
    • Mount: European 4 bolt flange ; 1.8 taper shaft
    • Ports: BSP
    • Drain: external case drain recommended for reversible use
    Regular price £148.86
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  • Out of Stock
    Hydra-PART 180 degree tilting unit for 1 - 3T Excavators Machines Giving  900 N/m Torque - Approved Hydraulics Limited
    Regular price £1,440.06
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    Hydra-PART 180 degree tilting unit for 1 - 3T Excavators Machines Giving 900 N/m Torque

    Key Features

    • Machine class: 1–3 t excavators
    • Tilt angle: ±90 deg total 180 deg range depending on install
    • Drive: rotary actuator power tilt
    • Torque: ~900 N.m class
    • Use: fine grading ; ditching ; battering in tight spaces
    Regular price £1,440.06
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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.

  • Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (10 kW Max) with Group 2 Pump - Approved Hydraulics Limited
    Regular price £225.66
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    Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (10 kW Max) with Group 2 Pump

    Key Features

    • Gear ratio: 3 ; 1 step up
    • Power rating: 10 kW maximum
    • Input/output: 540 rpm PTO nominal to ~1620 rpm output
    • Shafts: male 1 3/8 inch 6T PTO input
    • Pump interface: Group 2 pump fitted ; suited to lower flow auxiliary circuits
    • Housing: aluminium body ; compact size for light implements
    Regular price £225.66
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  • Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump - Approved Hydraulics Limited
    Regular price From £403.26
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    Aluminium Hydraulic Male Shaft AGRI PTO Gearbox 3:1 Ratio (20 kW Max) with Group 3 Pump

    Key Features

    • Gear ratio: 3 ; 1 step up for pump speed
    • Power rating: 20 kW maximum
    • Input/output: 540 rpm PTO nominal to ~1620 rpm output ; observe 3000 rpm max output guidance
    • Shafts: male PTO 1 3/8 inch 6 spline interface
    • Pump interface: supplied with Group 3 gear pump for higher flow demand
    • Construction: lightweight aluminium gearbox for agricultural PTO duty
    Regular price From £403.26
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  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £46.62
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    Seal Kit For Hydra Part MSY Motor (Zi)

    Key Features

    • Compatibility: Hydra Part MSY series disc valve orbital motors ; Zi pattern
    • Motor notes: MSY motors use disc valve distribution offering higher torque capability in family
    • Intended use: seal replacement for output shaft ; cover and porting to resolve leaks
    • Typical kit contents: shaft seal ; housing o rings ; drain port seals commonly replaced on service
    • Applications: industrial and mobile drives requiring rugged low speed high torque performance
    • Selection note: check MSY displacement code and mounting to select correct kit
    Regular price £46.62
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £2.40
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    50L Spool Seal Kit (1 x spool)

    Key Features

    • Compatibility: Hydra Part sectional control valves nominal 50 L/min class ; one spool section
    • Intended use: repack a single working section to cure external leaks and spool drag
    • Typical kit contents: spool o rings ; end cap seals ; dust seals used on 50L sections
    • Valve family: 3/8 inch port sectional valve spares range for 50 LPM systems
    • Install tip: clean bore ; lightly lubricate seals ; verify spool end float after rebuild
    • Result: restores smooth lever or solenoid actuation and reduces leakage to atmosphere
    Regular price £2.40
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £19.74
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    HP-20C type Group 2 Pump Seal Kit

    Key Features

    • Compatibility: Hydra Part HP-20C Group 2 gear pumps including common 1.8 taper variants
    • Intended use: replacement of front shaft seal and static seals during pump service
    • Typical kit contents: shaft lip seal ; body o rings and gaskets as required for Group 2 pumps
    • Reference performance: many Group 2 pumps in range rated up to 250 bar continuous service
    • Application: agricultural PTO pumps ; mobile hydraulics ; general industrial systems
    • Service note: inspect shaft journal and bushings ; replace if wear marks exceed spec
    Regular price £19.74
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £50.46
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    Baltrotor Seal Kit - GR30, GR30A, GR30PF

    Key Features

    • Compatibility: Baltrotors rotators GR30 ; GR30A ; GR30PF family
    • Rotator type: Grapple rotator with eye upper connection and axle lower mount ; unlimited rotation
    • Intended use: service kit for original seals used in GR30 series rotator heads
    • Typical kit contents: rotary housing ; shaft and port sealing elements needed for leak repair
    • Applications: forestry and small agricultural cranes using GR30 family rotators
    • Fitment note: verify exact GR30 variant before installation to match geometry
    Regular price £50.46
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £26.36
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    Cylinder Seal kit 30-60/70 series 203/303/403/503

    Key Features

    • Compatibility: Hydra Part cylinder series 203 ; 303 ; 403 ; 503
    • Bore sizes: 30 ; 40 ; 50 ; 60/70 mm range options
    • Intended use: complete reseal kit for the listed cylinder families
    • Typical kit contents: seals for piston ; rod ; and wiper plus static rings as used in cylinder rebuild
    • Applications: compact loaders ; attachments ; light industrial rams within these series
    • Selection note: confirm series and bore from cylinder ID to match the correct kit option
    Regular price £26.36
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £27.20
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    Cylinder Seal kit 35-60/70 standard

    Key Features

    • Compatibility: Hydra Part standard cylinders ; bores 35 ; 40 ; 50 ; 60/70 mm
    • Intended use: reseal kit to address external leaks ; internal bypass and poor cylinder holding
    • Typical kit contents: piston seal ; rod seal ; wiper ; static seals as typically included in kits
    • Applications: light plant ; agricultural implements ; compact handling equipment
    • Sizing note: measure bore and rod to ensure correct option under the 35 ; 60/70 set
    • Install tip: use appropriate assembly sleeves to avoid cutting PTFE or elastomer lips
    Regular price £27.20
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  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    12VDC - 36W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 12 vdc
    • Power: 36 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £2.40
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    45L Control Valve Spool Seal Kit (1 x Spool)

    Key Features

    • Compatibility: 45l monoblock valve spool set (1 x spool)
    • Purpose: replace worn spool seals to reduce internal leakage and restore performance
    • Kit coverage: seals for one spool only
    • Cleanliness target (valve family): iso 4406 class 19/16
    • Typical medium: mineral hydraulic oil iso vg 32 ; 46
    • Installation note: lubricate seals and avoid damage during spool insertion
    Regular price £2.40
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  • 45L Monobloc Valve Double Acting (Spring only) - Approved Hydraulics Limited
    Regular price £17.75
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    45L Monobloc Valve Double Acting (Spring only)

    Key Features

    • Compatibility: 45l monoblock valve series ; hydra part ; hydrocontrol m45 family
    • Function: spring centered double acting spool positioner ; no detent
    • Spool interface: 16 mm spool diameter per 45l valve spec
    • System pressure (valve body ref): up to 315 bar
    • Flow rating (valve body ref): nominal 45 l/min ; max 65 l/min
    • Control options (valve family): manual lever ; cable ; pneumatic ; electro hydraulic
    • Typical applications (valve family): wood splitters ; agricultural loaders ; small cranes
    Regular price £17.75
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  • 2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable - Approved Hydraulics Limited
    Regular price £106.91
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    2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable

    Key Features

    • 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 £106.91
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  • 80L Control valve Detent Kit In All 3 Positions
    Regular price £31.36
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    80L Control valve Detent Kit In All 3 Positions

    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 £31.36
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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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  • 45L Monobloc Valve 2 Axis Mechanical Joystick Kit (LCB) - Approved Hydraulics Limited
    Regular price £55.18
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    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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  • 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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    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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  • 80L-100L-150L Control Valve Carry Over Plug  3/8" - Approved Hydraulics Limited
    Regular price £1.80
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    80L-100L-150L Control Valve Carry Over Plug 3/8"

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 3/8" bsp
    • Compatibility: 80l ; 100l ; 150l valve families
    • Use case: connect upstream valve to downstream control valve
    • System rating: for host valves operating to 315 bar
    Regular price £1.80
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  • 45L Monobloc Valve Motor Spool Type 2 (G) - Approved Hydraulics Limited
    Regular price £22.14
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    45L Monobloc Valve Motor Spool Type 2 (G)

    Key Features

    • Spool type: motor spool type 2
    • Application: bi directional hydraulic motors
    • Behavior: neutral geometry reduces load shock and cavitation
    • Compatibility: 45l monobloc valve series
    • Positions: 3 position ; spring return to neutral
    Regular price £22.14
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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 - 100L - 120 - 150L Control Valve End Cap
    Regular price £4.00
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    90L - 100L - 120 - 150L Control Valve End Cap

    Key Features

    • Function: end cap for spool section ; closes body and retains hardware
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Options: with stroke limiter ; without stroke limiter
    • Maintenance: allows access to spring or detent kits
    • Typical use: service replacement to restore manual lever feel
    Regular price £4.00
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Shop All Components for Professional Hydraulic Applications

Discover quality shop all components 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 control valves, line mounted valves 1, hydraulic cylinders, hydraulic pumps 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.