• 1/4" BSP Male for Bonded Seal x 1/4" BSP Female Swivel 90° Compact Elbow - Approved Hydraulics Limited
    Regular price £30.83
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    • Delivery to UK & Ireland

    3/8" BSP Male for Bonded Seal x 3/8" BSP Female Swivel 90° Compact Elbow

    Key Features

    • Type: 90° elbow adaptor (male to swivel female)
    • Threads: 3/8 to 3/8 BSP
    • Seal: male end designed for bonded washer sealing
    • Swivel: female side uses captive nut to avoid hose twist
    • Body: compact body for tight installation envelopes
    Regular price £30.83
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/4" BSP Male to 1/2 BSP Female Pressure Guage Adaptor - Approved Hydraulics Limited
    Regular price £5.28
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    3/8" BSP Male to 1/2" BSP Female Pressure Guage Adaptor

    Key Features

    • Type: pressure gauge adaptor
    • Threads: 3/8 to 1/2 BSP
    • Seat: 60° cone or flat seat depending on gauge port style
    • Material: plated carbon steel for hydraulic service
    • Use: connect panel or test gauges; transmitters or sensors
    Regular price £5.28
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  • 1/2" BSP Male x 1 1/4" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £16.48
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    3/8" BSP Male x 1" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 3/8 to 1 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £16.48
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £7.12
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    3/8" BSP Male x 1/2" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor female to female
    • Threads: 3/8 to 1/2 BSP
    • Swivel: captive nuts allow hose connection without twisting
    • Seal: flat-faced or washered seal depending on variant
    • Use: hose-to-hose connection where orientation matters
    Regular price £7.12
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    • 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.

  • 1/2" BSP Male x 3/8" BSP Fixed Female Extended Adaptor - Approved Hydraulics Limited
    Regular price £2.99
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    3/8" BSP Male x 1/2" BSP Fixed Female Extended Adaptor

    Key Features

    • Type: male to fixed female extended adaptor
    • Threads: 3/8 to 1/2 BSP
    • Body: extended length to clear guards or deep ports
    • Material: plated carbon steel for hydraulic service
    • Use: adapt port gender/size and increase spanner access
    Regular price £2.99
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £3.18
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    • Delivery to UK & Ireland

    3/8" BSP Male x 1/2" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 3/8 to 1/2 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £3.18
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 3/8" BSP Fixed Female Extended Adaptor - Approved Hydraulics Limited
    Regular price £2.70
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    • Delivery to UK & Ireland

    3/8" BSP Male x 3/8" BSP Fixed Female Extended Adaptor

    Key Features

    • Type: male to fixed female extended adaptor
    • Threads: 3/8 to 3/8 BSP
    • Body: extended length to clear guards or deep ports
    • Material: plated carbon steel for hydraulic service
    • Use: adapt port gender/size and increase spanner access
    Regular price £2.70
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £2.36
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    • Delivery to UK & Ireland

    3/8" BSP Male x 3/8" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 3/8 to 3/8 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £2.36
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    1/2" BSP Male x 1/2" BSPT Tapered Adaptor - Approved Hydraulics Limited
    Regular price £4.00
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    • Delivery to UK & Ireland

    3/8" BSP Male x 3/8" BSPT Tapered Adaptor

    Key Features

    • Type: parallel-to-taper adaptor for BSP connections
    • Standards: BSPP (ISO 228) to BSPT (ISO 7) depending on ends
    • Threads: 3/8 to 3/8 BSP
    • Sealing: taper thread seals with thread sealant; parallel with washer/bonded seal
    • Use: connect tapered ports to parallel hose/valve fittings
    Regular price £4.00
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSP steel body for A2 cartridge valve
    Regular price £28.04
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    • Delivery to UK & Ireland

    3/8" BSP steel body for A2 cartridge valve

    Key Features

    • Thread: 3/8" BSPP ports
    • Material: steel body for robustness
    • Interface: accepts A2 size screw-in cartridge valve
    • Use: manifold body for line-mounted control functions
    • Service: suitable for industrial hydraulic circuits
    Regular price £28.04
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" BSP x 3/4" BSP Bulkhead Adaptor with Locknut - Approved Hydraulics Limited
    Regular price £21.28
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    3/8" BSP x 3/8" BSP Bulkhead Adaptor with Locknut

    Key Features

    • Type: bulkhead adaptor with locknut for panel/tank pass-through
    • Threads: 3/8 to 3/8 BSP
    • Hardware: includes locknut for secure clamping
    • Material: plated carbon steel
    • Use: route hose/pipe through guards or reservoirs cleanly
    Regular price £21.28
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSPP Double Acting Pilot Check Valve - Approved Hydraulics Limited
    Regular price £23.29
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    • Delivery to UK & Ireland

    3/8" BSPP Double Acting Pilot Check Valve

    Key Features

    • Type: double acting pilot operated check valve
    • Ports: 3/8 BSPP
    • Function: locks actuator in both directions until pilot pressure opens
    • Benefit: load holding with controlled release
    • Use: cylinders that must hold position under load
    Regular price £23.29
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSPT Tapered x 3/8" BSPT Tapered
    Regular price £3.23
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    • Delivery to UK & Ireland

    3/8" BSPT Tapered x 3/8" BSPT Tapered

    Key Features

    • Type: hydraulic fitting
    • Threads: 3/8 to 3/8 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £3.23
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Cylinder Breather - Approved Hydraulics Limited
    Regular price £12.59
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    • Delivery to UK & Ireland

    3/8" Cylinder Breather

    Key Features

    • Thread: 3/8" BSP
    • Function: vents cylinder to atmosphere while filtering intake air
    • Element: integrated filter to reduce contamination ingress
    • Use: maintains pressure balance; prevents vacuum build-up
    • Application: hydraulic cylinders; gearboxes; reservoirs
    Regular price £12.59
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps
    Regular price £72.67
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    • 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 £72.67
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    3/8" Hose Burst Valve Cartridge - Approved Hydraulics Limited
    Regular price £10.16
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    • Delivery to UK & Ireland

    3/8" Hose Burst Valve Cartridge

    Key Features

    • Function: hose rupture protection check valve
    • Port size: 3/8" cavity
    • Use: locks flow on line failure
    • Install: screw in cartridge to cylinder port
    • Application: hydraulic system component
    Regular price £10.16
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Hose Burst Valve in a Female - Female Housing
    Regular price £15.89
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    • Delivery to UK & Ireland

    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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Hose Burst Valve in a Male - Female Housing - Approved Hydraulics Limited
    Regular price £13.96
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    • Delivery to UK & Ireland

    3/8" Hose Burst Valve in a Male - Female Housing

    Key Features

    • Ports: G 3/8 BSPP male x female
    • Function: flow actuated hose burst safety valve
    • Max flow: 45 l.min typical
    • Max pressure: 350 bar
    • Body: zinc plated steel ; compact inline
    • Notes: install close to actuator port for best protection
    Regular price £13.96
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Normally Open Poppet Valve 2/2 24vDC Solenoid Operated with connector
    Regular price £136.31
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    • Delivery to UK & Ireland

    3/8" Normally Open Poppet Valve 2/2 24vDC Solenoid Operated with connector

    Key Features

    • Valve type: 2/2 poppet ; normally open
    • Port size: 3/8"
    • Actuation: 24 vdc solenoid
    • Connector: din plug included
    • Use: line mounted isolation / bypass
    Regular price £136.31
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptor
    Regular price £9.18
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    • Delivery to UK & Ireland

    3/8" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: 90°
    Regular price £9.18
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor
    Regular price £8.22
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    • Delivery to UK & Ireland

    3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: Straight
    Regular price £8.22
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar - Approved Hydraulics
    Regular price £109.37
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    • Delivery to UK & Ireland

    3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar

    Key Features

    • Type: dual cross line relief valve
    • Port size: 3/8"bsp
    • Rated flow: 35 lpm
    • Adjustment range: 100 to 350 bar
    • Function: protects hydraulic motors from shock loads ; cross connected relief
    • Mounting: in line ; flangeable to motor on some models
    • Typical use: omp ; omr ; omh motor protection ; overrunning load control
    Regular price £109.37
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1 1/4" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £4.24
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    • Delivery to UK & Ireland

    3/8BSPM - 3/4BSPM Ad

    Key Features

    • Type: hydraulic fitting
    • Threads: 3/8 to 3/4 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £4.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    30mm x 30mm DU Bush - Approved Hydraulics Limited
    Regular price £2.90
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    • Delivery to UK & Ireland

    30mm x 30mm DU Bush

    Key Features

    • Type: DU composite self-lubricating plain bush
    • Size: 30 mm bore x 30 mm length
    • Construction: steel back with sintered bronze + PTFE layer
    • Benefit: dry-running; low friction; good wear resistance
    • Use: pivot points and linkages on attachments
    Regular price £2.90
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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.