• 3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps
    Regular price £60.55 Ex VAT £72.67 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps

    Key Features

    • Thread size: G 3/8 BSPP
    • Setting range: 10 to 180 bar adjustable
    • Max flow: 35 l.min ; 45 l.min variants
    • Max pressure: 350 bar
    • Construction: zinc plated steel body ; hardened internal parts
    • Seals: NBR Buna N standard
    • Function: dual cross line relief with crossed tank
    • Typical use: motor or cylinder shock protection with independent port settings
    Regular price £60.55 Ex VAT £72.67 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Proximity Switch
    Regular price £133.01 Ex VAT £159.62 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Proximity Switch

    Key Features

    • Body style: M18 threaded barrel flush mount
    • Sensing range: 8 mm nominal
    • Supply voltage: 10 to 30 vdc
    • Output options: 2 wire dc ; PNP ; NPN ; NO ; NC variants
    • Ingress protection: IP65 ; IP66 ; IP67 ; IP68 ; IP69K
    • Switching frequency: 400 Hz typical
    • Operating temperature: -40 to +85 degC
    • Connection: M12 A coded connector ; 2 m PUR cable variants
    • Standard: IEC 60947-5-2 inductive proximity
    Regular price £133.01 Ex VAT £159.62 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Oil Filter Element - FRD17 - 93mm - 25µm
    Regular price £16.21 Ex VAT £19.46 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Oil Filter Element - FRD17 - 93mm - 25µm

    Key Features

    • Series: FRD17 replacement element
    • Diameter: 93 mm nominal element OD
    • Filtration rating: 25 µm nominal media grade
    • Intended use: particulate removal in hydraulic oil to protect components
    • Applications: return ; suction or low pressure filter housings sized for FRD17 elements
    • Service note: monitor differential pressure and change when indicator shows restriction
    Regular price £16.21 Ex VAT £19.46 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Filter Housing Gasket
    Regular price £9.26 Ex VAT £11.12 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Filter Housing Gasket

    Key Features

    • Function: seals the interface between hydraulic filter housing and cover to prevent leaks
    • Compatibility: for Hydra Part filter housing family reference CCJUN type
    • Intended use: gasket replacement during element changes or service
    • Applications: tank return ; pressure or suction filter assemblies
    • Service note: replace at each element change to maintain seal integrity
    • Material note: select elastomer compatible with system oil and temperature
    Regular price £9.26 Ex VAT £11.12 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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.

  • Return Air Filter - 152mm - 25 µm - Approved Hydraulics Limited
    Regular price £70.56 Ex VAT £84.68 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Return Air Filter - 152mm - 25 µm

    Key Features

    • Type: tank top return ; air breather element
    • Length: 152 mm
    • Filtration: 25 µm nominal
    • Use: hydraulic reservoir breathing ; return filtration
    • Compatibility: frd ; similar housings
    Regular price £70.56 Ex VAT £84.68 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • SCREW ST4,8x25 (DIN15481)
    Regular price £0.18 Ex VAT £0.22 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    SCREW ST4,8x25 (DIN15481)

    Key Features

    • Standard: DIN 15481
    • Size: ST4;8 x 25
    • Type: thread-forming screw for metal
    • Head: pan/countersunk style (per variant)
    • Use: securing covers; guards; light-duty components
    Regular price £0.18 Ex VAT £0.22 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Padlock for Pad Cages - Approved Hydraulics Limited
    Regular price £2.55 Ex VAT £3.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Padlock for Pad Cages

    Key Features

    • Model: PADCAGE-PADLOCK-20MM
    • Purpose: locking pad for stabiliser pad storage cage systems
    • Security level: moderate site security
    • Use: secures cage door during storage and transport
    • Material: hardened shackle with compact body
    Regular price £2.55 Ex VAT £3.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • MR motorcover used on 32mm shaft conversion - Approved Hydraulics Limited
    Regular price £8.55 Ex VAT £10.26 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    MR motorcover used on 32mm shaft conversion

    Key Features

    • Component: motor cover for MR motor 32 mm shaft conversion
    • Function: protects front seal area and bearing alignment
    • Use: fitted during conversion to 32 mm shaft
    • Benefit: clean finish and debris protection
    • Compatibility: MR series housings
    Regular price £8.55 Ex VAT £10.26 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 15cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain
    Regular price £142.55 Ex VAT £171.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    15cc Group 2 Reversible Gear Motor 4 Bolt 1:8 taper 250 Bar WP 3/4" BSP Ports + 1/4" BSP Drain

    Key Features

    • Displacement: 15 cc/rev
    • Group: group 2 external gear motor
    • Mount: 4 bolt european
    • Shaft: 1.8 taper keyed
    • Ports: inlet/outlet 3/4" bspp ; case drain 1/4" bspp
    • Working pressure: 250 bar class
    • Rotation: reversible cw ; ccw
    • Use: winch ; conveyor ; flail head drive
    Regular price £142.55 Ex VAT £171.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit - Approved Hydraulics Limited
    Regular price £90.29 Ex VAT £108.35 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit

    Key Features

    • Kit: pneumatic actuation for sectional control valves
    • Compatibility: 80 l ; 90 l ; 100 l ; 120 l ; 150 l control valves
    • Supply: compressed air 6 ; 10 bar typical
    • Contents: cylinders ; brackets ; hoses ; fittings
    • Use: remote spool operation from cab or pendant
    Regular price £90.29 Ex VAT £108.35 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Knob Model 1052/M d. 40 M10x30 - Approved Hydraulics Limited
    Regular price £2.26 Ex VAT £2.72 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Knob Model 1052/M d. 40 M10x30

    Key Features

    • Diameter: 40 mm
    • Thread: m10 stud
    • Stud length: 30 mm
    • Grip: round knob; ribbed edge
    • Material: thermoplastic knob; steel stud
    • Use: panel; lever; valve actuation handle
    Regular price £2.26 Ex VAT £2.72 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Group 2 Gear Pump 14cc Clockwise Rot. 9 Spline Shaft With 50mm Spigo - 250 Bar Cont. Pressure - DIN 5482
    Regular price £135.05 Ex VAT £162.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Group 2 Gear Pump 14cc Clockwise Rot. 9 Spline Shaft With 50mm Spigo - 250 Bar Cont. Pressure - DIN 5482

    Key Features

    • Pump series: Group 2 gear pump
    • Displacement: 14 cc.rev
    • Rotation: clockwise
    • Shaft: 9 tooth spline SAE J498 9T 16.32 DP
    • Ports: BSP threaded
    • Pressure class: up to 250–270 bar depending on model
    Regular price £135.05 Ex VAT £162.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L 1/2" Working section float spool 5BY-13NZL detent kit
    Regular price £138.15 Ex VAT £165.79 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L 1/2" Working section float spool 5BY-13NZL detent kit

    Key Features

    • Section: 80 LPM 1/2" working section
    • Spool: float spool 5BY-13NZL style
    • Neutral: spring centered ; 4th detent for float
    • Ports: A.B 1/2" BSP ; P.T 3/4" BSP typical for 80 L
    • Use: loader boom function ; road planers ; snow ploughs
    Regular price £138.15 Ex VAT £165.79 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" BSP IN-LINE 80 lpm RELIEF VALVE - 100-350 bar
    Regular price £93.55 Ex VAT £112.27 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    3/4" BSP IN-LINE 80 lpm RELIEF VALVE - 100-350 bar

    Key Features

    • Ports: 3/4" BSPP inline
    • Flow: 80 l.min
    • Adjustment range: 100–350 bar
    • Function: direct acting relief ; protects downstream circuits
    • Construction: zinc plated steel body ; hardened internals
    Regular price £93.55 Ex VAT £112.27 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Solenoid Operated 3/4" Check Valve N/C In Both Directions 100 LPM Max Flow and Working Pressure 350 Bar -  24V DC.
    Regular price £229.35 Ex VAT £275.22 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Solenoid Operated 3/4" Check Valve N/C In Both Directions 100 LPM Max Flow and Working Pressure 350 Bar - 24V DC.

    Key Features

    • Ports: 3/4" BSPP
    • Type: solenoid operated poppet check valve
    • State: normally closed in both directions
    • Flow rating: 80–120 l.min class
    • Max pressure: 315–350 bar
    • Connector: DIN 43650 Form A coil interface
    Regular price £229.35 Ex VAT £275.22 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Differential Type Relief Valve, VMPP 3/4" (20-200 Bar Adjustment) - Approved Hydraulics Limited
    Regular price £86.99 Ex VAT £104.39 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic Differential Type Relief Valve, VMPP 3/4" (20-200 Bar Adjustment)

    Key Features

    • Type: differential poppet pressure relief valve VMPP
    • Ports: 3/8" BSPP P ; T
    • Setting range: 100–250 bar adjustable
    • Nominal flow variants: 20 l.min ; 50 l.min options
    • Leakage: guided poppet ; negligible leakage
    • Materials: zinc plated steel body ; hardened internals
    Regular price £86.99 Ex VAT £104.39 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra-PART 90 Degree Tilting Unit For 4-8T Excavators Machines Giving 7000 N/m Torque
    Regular price £3,200.05 Ex VAT £3,840.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydra-PART 90 Degree Tilting Unit For 4-8T Excavators Machines Giving 7000 N/m Torque

    Key Features

    • Machine class: 4–8 t excavators
    • Tilt angle: ±45 deg ; 90 deg total
    • Output torque: 7000 N.m
    • Drive type: sealed rotary actuator
    • Intended use: precision grading ; ditching ; backfilling
    Regular price £3,200.05 Ex VAT £3,840.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra-PART 90 Degree Tilting Unit For 8T-12T Excavators Machines Giving 9000 N/m Torque
    Regular price £3,800.05 Ex VAT £4,560.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydra-PART 90 Degree Tilting Unit For 8T-12T Excavators Machines Giving 9000 N/m Torque

    Key Features

    • Machine class: 8–12 t excavators
    • Tilt angle: ±45 deg ; 90 deg total
    • Output torque: 9000 N.m
    • Drive type: sealed rotary actuator
    • Hydraulics: suitable for two line control ; check flow ; pressure per datasheet
    • Use: grading ; battering ; trenching without repositioning machine
    Regular price £3,800.05 Ex VAT £4,560.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra-PART 134 degree tilting unit for 12-16T Excavators Machines Giving 15000 N/m Torque
    Regular price £6,100.05 Ex VAT £7,320.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydra-PART 134 degree tilting unit for 12-16T Excavators Machines Giving 15000 N/m Torque

    Key Features

    • Tilt range: 134 degree total tilt arc
    • Rated torque: 15000 N m output torque class
    • Carrier class: suits 12 ; 16 ton excavators
    • Use case: tilting of buckets and tools for grading ; trenching and access works
    • Integration: compact rotary actuator package ready to mount to appropriate hitch
    • Notes: select correct mount and hydraulics to suit carrier aux circuit
    Regular price £6,100.05 Ex VAT £7,320.06 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Motor Spool For 50L AK Electric / Lever Operated Valve - Approved Hydraulics Limited
    Regular price £12.70 Ex VAT £15.25 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Motor Spool For 50L AK Electric / Lever Operated Valve

    Key Features

    • Spool function: motor spool geometry with A ; B open to tank in neutral for freewheeling
    • Valve family: fits 50 LPM AK electric or lever operated sectional valve body
    • Purpose: minimise cavitation risk and allow smooth motor rundown at neutral
    • Use case: hydraulic motors on conveyors ; augers ; winches
    • Service note: check section seals and end caps during spool replacement
    • Selection: confirm 50L AK body type before ordering
    Regular price £12.70 Ex VAT £15.25 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 8 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £412.54 Ex VAT £495.05 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    8 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 8 on ; off pushbuttons
    • Supply: 12 ; 24 VDC receiver
    • Harness: 2.4 m prewired receiver connection
    • Use case: multiple discrete outputs for valve coils or contactor logic
    • Applications: hydraulic attachment control where simple binary commands are required
    • Note: choose e stop variant where a safety interlock is mandated
    Regular price £412.54 Ex VAT £495.05 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 4 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £320.06 Ex VAT £384.08 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    4 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 4 on ; off pushbuttons
    • Supply: 12 ; 24 VDC receiver
    • Harness: 2.4 m prewired receiver lead
    • Use case: simple on ; off control of one or two double acting functions
    • Form factor: handheld transmitter with compact receiver
    • Applications: tippers ; winches ; auxiliary hydraulic functions
    Regular price £320.06 Ex VAT £384.08 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    8 Button On/Off + E-stop Radio Remote System 12-24VDC prewired 2.4m Cable - Approved Hydraulics Limited
    Regular price £711.41 Ex VAT £853.70 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    8 Button On/Off + E-stop Radio Remote System 12-24VDC prewired 2.4m Cable

    Key Features

    • Functions: 8 on ; off pushbuttons with dedicated emergency stop
    • Supply: 12 ; 24 VDC receiver input
    • Harness: prewired receiver cable 2.4 m for quick install
    • Use case: discrete control of solenoid valves ; contactors or relays on mobile plant
    • Integration: suited to retrofit of simple hydraulic controls with radio link
    • Safety: e stop provides immediate stop signal to system interlock
    Regular price £711.41 Ex VAT £853.70 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12 Button On/Off + E-stop Radio Remote System 12-24VDC prewired 2.4m cable - Approved Hydraulics Limited
    Regular price £1,222.28 Ex VAT £1,466.74 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland

    12 Button On/Off + E-stop Radio Remote System 12-24VDC prewired 2.4m cable

    Key Features

    • Functions: 12 on ; off pushbuttons plus dedicated emergency stop
    • Supply: 12 ; 24 VDC receiver input prewired with 2.4 m cable
    • Use case: retrofit on ; off control of hydraulic valves or contactor logic
    • Form factor: handheld transmitter with paired receiver for mobile machinery
    • Safety: E stop provides immediate shutdown signal to system interlock
    • Frequency: industrial license free bands with robust interference mitigation
    Regular price £1,222.28 Ex VAT £1,466.74 Inc VAT
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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.