• 24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long - Approved Hydraulics Limited
    Regular price £24.68
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    24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long

    Key Features

    • Voltage: 24 vdc
    • Bore: 16.3 mm
    • Length: 50 mm
    • Use: z50 sectional valve coil
    • Connector: din plug
    Regular price £24.68
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  • T1 KF1 Blades - Sold Individually - Approved Hydraulics Limited
    Regular price £9.14
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    T1 KF1 Blades - Sold Individually

    Key Features

    • Compatibility: t1 head
    • Type: kf1 cutting blade
    • Sale: sold individually
    • Use: grass ; hedging
    • Application: hydraulic attachment component
    Regular price £9.14
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  • 1/4" Cylinder Breather - Approved Hydraulics Limited
    Regular price £9.08
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    1/4" Cylinder Breather

    Key Features

    • Thread: 1/4" BSP
    • Function: vents cylinder/actuator to atmosphere
    • Element: porous filter to block dust ingress
    • Benefit: prevents vacuum build-up and moisture accumulation
    • Use: protects seals and internal surfaces during stroke
    Regular price £9.08
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  • 24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
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    24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 24 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A
    • Insulation class: Class H typical for DC coils
    • Protection: IP65 with gasketed DIN plug
    Regular price £124.93
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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.

  • 12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
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    12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 12 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A or flying lead ; per build
    • Duty: continuous ; wet armature compatible
    • Protection: IP65 with correct DIN plug
    Regular price £124.93
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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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  • Out of Stock
    3/8" 3 Way Adjustable Priority Flow Control Valve  - Excess to Line. - Approved Hydraulics Limited
    Regular price £107.47
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    3/8" 3 Way Adjustable Priority Flow Control Valve - Excess to Line.

    Key Features

    • Ports: G 3/8 BSPP
    • Function: 3 way pressure compensated priority flow control
    • Max inlet flow: 60 l.min
    • Max outlet C flow: 35 l.min
    • Max pressure: 270 bar
    • Body: aluminium body ; hardened steel internals
    • Use: set constant actuator flow with excess to tank or secondary circuit
    Regular price £107.47
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  • Out of Stock
    3/8" Hose Burst Valve in a Female - Female Housing
    Regular price £15.89
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    3/8" Hose Burst Valve in a Female - Female Housing

    Key Features

    • Ports: G 3/8 BSPP female x female
    • Function: flow operated hose burst safety shut off
    • Max flow: 50 l.min typical
    • Max pressure: 350 bar
    • Body: zinc plated steel ; low leakage design
    • Options: orifice in disc for emergency lowering on request
    • Mounting: install at cylinder port ; use downstream flow regulator to control lowering
    Regular price £15.89
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  • Out of Stock
    3 WAY PRIORITY VALVE - EXCESS TO LINE 3/4"
    Regular price £159.00
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    3 WAY PRIORITY VALVE - EXCESS TO LINE 3/4"

    Key Features

    • Ports: G 3/4 BSPP
    • Function: 3 way priority flow control ; excess to S line
    • Max inlet flow: 150 l.min
    • Max regulated flow: up to 90 l.min adjustment range
    • Max pressure: 260 bar
    • Body: aluminium body ; hardened internal parts
    • Adjustment: twin handknob ; lockable
    • Typical use: steering priority ; auxiliary circuits from single pump
    Regular price £159.00
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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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  • 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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  • CABLE FOR MEC.OPERATION 3,0M WITH LEVER - Approved Hydraulics Limited
    Regular price £136.88
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    CABLE FOR MEC.OPERATION 3,0M WITH LEVER

    Key Features

    • Type: mechanical cable operation kit
    • Length: 3.0 m
    • Includes: lever ; cable ; mounting hardware
    • Use: operate pto or valve from cab
    • Application: hydraulic system component
    Regular price £136.88
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  • TRIANGULAR GASKET 3 HOLES
    Regular price £2.66
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    TRIANGULAR GASKET 3 HOLES

    Key Features

    • Shape: triangular gasket
    • Holes: 3-hole pattern
    • Function: seals mating faces in hydraulic assemblies
    • Use: ABER pump spares / connectors
    • Service note: replace during maintenance to ensure seal integrity
    Regular price £2.66
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  • Oil Filter Element - FRD08 - 152mm - 25 µm - Approved Hydraulics Limited
    Regular price £21.78
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    Oil Filter Element - FRD08 - 152mm - 25 µm

    Key Features

    • Part number: CCDEP04
    • Element type: Hydraulic oil filter element replacement
    • Filtration rating: 25 µm
    • Dimensions: 70 mm OD; 28 mm ID; 130 mm height
    • Filter media: UFI.CELL filter media
    • Weight: 0.25 kg
    • Cross references: Sofima CRE025CV1; UFI ERA32NCD
    • Typical use: Oil filtration in hydraulic circuits to protect pumps and valves
    Regular price £21.78
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  • Return Air Filter - 235mm - 25 µm
    Regular price £81.07
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    Return Air Filter - 235mm - 25 µm

    Key Features

    • Part number: FRD09
    • Filter type: Return line filter for hydraulic oil systems
    • Filtration rating: 25 µm mesh
    • Height: 235 mm
    • Connection: 1 in BSP
    • Max working pressure: 3 bar
    • Bypass valve: 1.7 bar ±10 percent
    • Materials: Head and cover aluminium; bowl polyamide
    Regular price £81.07
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  • Baltrotor Gr30 Hose guard - Approved Hydraulics Limited
    Regular price £36.06
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    Baltrotor Gr30 Hose guard

    Key Features

    • Type: replacement hose guard for GR30 pendant rotators
    • Mounting: bolts to top plate/stator
    • Benefit: shields hoses from abrasion and debris
    • Use: forestry and material handling cranes
    • Material: steel guard with serviceable fasteners
    Regular price £36.06
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  • Pin

    Pin - Approved Hydraulics Limited
    Regular price £61.78
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    Pin

    Key Features

    • Type: steel pin
    • Use: crane or attachment joint
    • Note: select diameter ; length to suit
    • Application: hydraulic system component
    • Application: hydraulic system component
    Regular price £61.78
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  • Pin (35 dia,) - Approved Hydraulics Limited
    Regular price £174.06
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    Pin (35 dia,)

    Key Features

    • Type: hardened steel pin
    • Diameter: 35 mm
    • Use: link ; joint ; hinge on crane/rotator
    • Finish: zinc plated or oiled
    • Application: hydraulic system component
    Regular price £174.06
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  • Baltrotors GR 105 DB rotator top head
    Regular price £336.06
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    Baltrotors GR 105 DB rotator top head

    Key Features

    • Component: top head/stator plate for GR105DB rotator
    • Type: double bearing heavy-duty pendant rotator family
    • Function: mounts to crane head and carries hose guard
    • Material: machined steel; corrosion protected
    • Service: replace when worn bores or mounting damage occurs
    Regular price £336.06
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  • Baltrotors Steel Sleeve - 25mm Bush Assembly Complete (Pair) - Approved Hydraulics Limited
    Regular price £70.58
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    Baltrotors BR1 Bushing 28mm ID (HMF cranes)

    Key Features

    • Component: BR1 link bushing with 28 mm internal diameter
    • Compatibility: common on HMF crane link heads
    • Function: supports upper eye; reduces wear
    • Material: steel/bronze depending on variant
    • Service: periodic greasing recommended
    Regular price £70.58
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  • CPR/15 adaptor plate - Approved Hydraulics Limited
    Regular price £158.76
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    CPR/15 adaptor plate

    Key Features

    • Type: adaptor plate for CPR15 family
    • Pattern: CPR15 bolt and pilot geometry
    • Material: precision machined steel
    • Use: rigid mounting to industrial grapples
    • Service: check gasket/O-ring groove and surface finish
    Regular price £158.76
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  • CPR9-04ST Adaptor Plate - Approved Hydraulics Limited
    Regular price £150.06
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    CPR9-04ST Adaptor Plate

    Key Features

    • Type: adaptor plate for CPR9-04ST rotators
    • Pattern: CPR9 bolt circle and pilot register
    • Use: mounts flat-body CPR rotator to grapple frame
    • Material: machined steel with countersunk/through holes
    • Note: verify fastener grade and torque
    Regular price £150.06
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  • Baltrotors Gr30 X type hose guard
    Regular price £134.98
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    Baltrotors Gr30 X type hose guard

    Key Features

    • Type: hose guard
    • Compatibility: baltrotors gr series
    • Use: protects hoses at rotator body
    • Mounting: bolt on plates
    • Application: hydraulic system component
    Regular price £134.98
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  • Out of Stock
    Balt GR 55 M hose guard - Approved Hydraulics Limited
    Regular price £43.88
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    Balt GR 55 M hose guard

    Key Features

    • Type: hose guard
    • Compatibility: baltrotors gr series
    • Use: protects hoses at rotator body
    • Mounting: bolt on plates
    • Application: hydraulic system component
    Regular price £43.88
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Newly Added Products for Professional Hydraulic Applications

Discover quality newly added products 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.