• Hexagon Socket Plug G1/4 - Approved Hydraulics Limited
    Regular price £2.59
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    Hexagon Socket Plug G1/4

    Key Features

    • Thread: g 1/4 bspp
    • Standard: din 908 screw plug ; hex socket with collar
    • Material: steel ; zinc plated
    • Use: blanking of hydraulic manifold ports ; test points
    • Sealing: with soft metal washer ; or bonded seal ; or o ring face
    Regular price £2.59
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  • HF1 Flail Hammers - Approved Hydraulics Limited
    Regular price £24.90
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    HF1 Flail Hammers

    Key Features

    • Compatibility: t1 rev ; t3 ; t5 heads
    • Tool type: hammer ; fits fr50 ; fs50 rotors
    • Mounting: bolt-on to rotor lug spacing
    • Typical use: grass ; scrub with stone tolerance
    • Heat treatment: austempered steel for impact resistance
    Regular price £24.90
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  • HF14 Flail Hammers - Approved Hydraulics Limited
    Regular price £97.24
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    HF14 Flail Hammers

    Key Features

    • Compatibility: fr-series rotors medium-heavy
    • Material: forged ; heat treated
    • Mounting: through-bolt ; bush
    • Use: general roadside maintenance
    • Note: verify hammer code stamped on body
    Regular price £97.24
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  • HF15 Flail Hammers
    Regular price £77.78
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    HF15 Flail Hammers

    Key Features

    • Compatibility: fr-series rotors heavy
    • Material: forged ; heat treated
    • Mounting: through-bolt ; bush
    • Use: heavier brushwork ; light wood
    • Note: replace in balanced pairs across rotor
    Regular price £77.78
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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.

  • Out of Stock
    HF17 Flail Hammers - Approved Hydraulics Limited
    Regular price £47.26
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    HF17 Flail Hammers

    Key Features

    • Compatibility: heavy fr rotors for large heads
    • Construction: forged steel hammer with replaceable bush
    • Mounting: bolt kit included
    • Use: dense scrub ; small timber
    • Balance: replace in sets to maintain rotor balance
    Regular price £47.26
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  • HF2 Flail Hammers - Approved Hydraulics Limited
    Regular price £22.75
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    HF2 Flail Hammers

    Key Features

    • Compatibility: t7 ; t9 heads
    • Tool type: heavy hammer ; fits fr70 rotors
    • Mounting: bolt-on; hardened bushings
    • Use: heavier brush ; light wood
    • Edge profile: beak/axe style for bite in woody growth
    Regular price £22.75
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  • HF3 Flail Hammers
    Regular price £28.60
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    HF3 Flail Hammers

    Key Features

    • Compatibility: t7 ; t9 rev heads
    • Rotor families: fr70 ; fr90 ; fr105 where fitted
    • Construction: forged ; heat treated
    • Mounting: bolt-on with through-pin and bush
    • Use: coarse vegetation ; roadside scrub
    Regular price £28.60
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  • HF6 Flail Hammers (T11, T13REV, T15REV)
    Regular price £43.37
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    HF6 Flail Hammers (T11, T13REV, T15REV)

    Key Features

    • Compatibility: t11 ; t13 rev ; t15 rev
    • Rotor family: heavy fr series
    • Construction: forged hammer body ; hardened edge
    • Applications: dense brush ; light timber
    • Mounting: bolt-on with bush; maintain set balance
    Regular price £43.37
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  • HF7-HF8  Flail Hammers (For FR70, FR90 & FR105 Models) - Approved Hydraulics Limited
    Regular price £47.26
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    HF7-HF8 Flail Hammers (For FR70, FR90 & FR105 Models)

    Key Features

    • Compatibility: fr70 ; fr90 ; fr105 rotors
    • Fitment: bolt-on with through-pin and bush
    • Use: coarse brush ; woody growth
    • Material: forged ; heat treated
    • Notes: choose hf7 or hf8 per rotor ; balance set changeover
    Regular price £47.26
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    • Order by 3pm for Next Day Delivery
  • High Pressure 3 Port Manual Diverter Valve - Steel 1" 500Bar - Approved Hydraulics Limited
    Regular price £137.88
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    High Pressure 3 Port Manual Diverter Valve - Steel 1" 500Bar

    Key Features

    • Type: 3 port manual diverter valve
    • Ports: 1" bsp
    • Pressure: up to 500 bar class
    • Body: steel construction
    • Use: select pressure line between two circuits
    Regular price £137.88
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  • High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar - Approved Hydraulics Limited
    Regular price £108.67
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    High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar

    Key Features

    • Type: 3 port manual lever diverter ; open centre
    • Pressure rating: up to 500 bar
    • Port size: 3/4"
    • Function: diverts inlet to a or b ; closed centre when specified
    • Use: circuit selection on high pressure lines
    Regular price £108.67
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  • Hydra Part High Pressure Carry Over for Z50/Z80 Valve - Approved Hydraulics
    Regular price £11.09
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    High Pressure Carry Over for Z50/Z80 Valve

    Key Features

    • Accessory: high pressure carry over ; power beyond sleeve
    • Compatibility: z50 ; z80 monoblock valves
    • Use: enables downstream circuits ; converts open centre to power beyond
    • Installation: fits in end section kit ; see valve data sheet
    • Working pressure: as per base valve rating ; up to 250 bar typical
    • Notes: requires appropriate return to tank path for excess flow
    Regular price £11.09
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  • Hydra Part High Visibility Stabiliser Pads - Approved Hydraulics
    Regular price From £30.90
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    High Visibility Stabiliser Pads

    Key Features

    • Material: uhmwpe
    • Colour: high visibility yellow
    • Point load capacity: 4 t to 160 t range
    • Use: stabiliser ; outrigger pad for cranes ; plant
    • Size options: multiple pad sizes available
    Regular price From £30.90
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  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £15.37
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    HP-10C Group 1 Pump Seal Kit

    Key Features

    • Compatibility: Hydra Part HP-10C Group 1 gear pumps
    • Intended use: renew shaft and static seals during Group 1 pump overhaul
    • Typical kit contents: front shaft oil seal ; body o rings ; gasket elements for Group 1 casing
    • Pump family: light duty aluminium gear pumps used widely on compact hydraulics
    • Service note: check for shaft play ; replace bearings if excessive to protect new seal
    • Applications: power packs ; small mobile circuits ; low to mid power implements
    Regular price £15.37
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    • Order by 3pm for Next Day Delivery
  • 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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    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £26.32
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    HP-30C Type Group 3 Pump Seal Kit

    Key Features

    • Compatibility: Hydra Part HP-30C Group 3 aluminium gear pumps
    • Intended use: service kit for shaft and static seals on Group 3 pump body
    • Typical kit contents: front lip seal ; cover o rings and body seals for Group 3 construction
    • Reference performance: Group 3 pumps in range typically used at higher flows and pressures
    • Applications: PTO driven systems ; industrial power units requiring larger displacements
    • Fitment check: confirm HP-30C family before ordering to ensure correct diameters
    Regular price £26.32
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    • Order by 3pm for Next Day Delivery
  • 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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £11.17
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    HP-C20 Tandem Gear Pump Seal Kit. Suits Front 067 or Rear 066

    Key Features

    • Compatibility: Hydra Part Group 2 tandem pumps using front code 067 ; rear code 066 interfaces
    • Intended use: renew the sealing set when splitting tandem sections or replacing shaft seal
    • Typical kit contents: shaft seal ; o rings ; interface seals used between tandem pump sections
    • Notes on assembly: ensure rear shaft selection matches torque from front section during build
    • Applications: tandem pumps on tippers ; loaders ; auxiliary hydraulic circuits
    • Variant note: front 067 ; rear 066 code covers common Group 2 tandem configurations
    Regular price £11.17
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  • Out of Stock
    HP-LVDT-DIN Double Pilot Check Valves - Approved Hydraulics Limited
    Regular price From £36.24
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    HP-LVDT-DIN Double Pilot Check Valves

    Key Features

    • Type: double pilot operated check valve
    • Threads: BSP
    • Function: locks load until pilot pressure releases checks
    • Use: load holding on cylinders and top links
    • Pressure: 315 to 350 bar class
    Regular price From £36.24
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    • Order by 3pm for Next Day Delivery
  • HP50 1/2" Solenoid & Lever Control Valves 50LPM 12/24VDC - Approved Hydraulics Limited
    Regular price From £404.90
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    HP50 1/2" Solenoid & Lever Control Valves 50LPM 12/24VDC

    Key Features

    • Valve type: monoblock ; solenoid + lever control
    • Nominal flow: 50 lpm
    • Coils: 12 vdc ; 24 vdc
    • Sections: up to 6 sections in single housing
    • Spool: double acting standard ; other spools available
    • Options: hp carry over ; valve kits ; connectors
    • Mounting: in line ; direct to system
    Regular price From £404.90
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  • Baltrotors HR10 SM Rotator - Approved Hydraulics

    POA

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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

    HR10 SM Rotator

    Key Features

    • Type: Baltrotors harvester rotator (SM series)
    • Application: forestry harvesters and processing heads
    • Mounting: rigid/separate mount configuration
    • Benefit: high durability for heavy cutting cycles
    • Support: spares and seal kits available

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Baltrotors HR12 SM Rotator - Approved Hydraulics

    POA

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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

    HR12 SM Rotator

    Key Features

    • Type: Baltrotors harvester rotator (SM series)
    • Application: forestry harvester heads and processing
    • Mounting: rigid/separate mount configuration
    • Feature: compact body with high torque output
    • Support: HR12 seal kits available

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Out of Stock
    Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £196.86
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    • Order by 3pm for Next Day Delivery

    HR12SM + HR 16SM + HR12US/16U Rotator Seal Kit

    Key Features

    • Scope: service kit for harvester rotators HR12/HR16
    • Rotators covered: HR12SM; HR16SM; HR12US; HR16U
    • Use: restore pressure integrity on harvester heads
    • Contents: full dynamic seal set; O-rings; rings; wipers
    • Note: install with clean mineral oil and lube seals
    Regular price £196.86
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £189.73
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    Hultdins Super Saw SS550-10/90 Hydraulic Cylinder Seal Kit. 121069 - 212290-R

    Key Features

    • Type: OEM cylinder seal kit
    • Compatibility: model stated in title
    • Contents: rod seal ; piston seal ; gland wiper ; O rings
    • Benefit: improved holding and reduced external leakage
    • Use: maintenance overhaul of cylinders
    Regular price £189.73
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    • Delivery to UK & Ireland
    • 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.