• 3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors
    Regular price £10.89 Ex VAT £13.07 Inc VAT
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    3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: straight
    • Port: 3/4"
    • Mounting: 3/4 hole on 51 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £10.89 Ex VAT £13.07 Inc VAT
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  • 1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors - Approved Hydraulics Limited
    Regular price £9.49 Ex VAT £11.39 Inc VAT
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    1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £9.49 Ex VAT £11.39 Inc VAT
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  • 3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor
    Regular price £6.85 Ex VAT £8.22 Inc VAT
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    3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: Straight
    Regular price £6.85 Ex VAT £8.22 Inc VAT
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  • 1" Male Female Tipper Quick Release  Coupling (Set) - Approved Hydraulics Limited
    Regular price £49.85 Ex VAT £59.82 Inc VAT
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    1" Quick Release Coupling (Screw Type, Female)

    Key Features

    • Type: screw to connect quick release coupling female
    • Port size: 1"
    • Benefit: high resistance to pressure spikes
    • Use: high pressure attachments ; hammer circuits
    • Standard: screw to connect design
    • Pressure: high impulse rated per series
    Regular price £49.85 Ex VAT £59.82 Inc VAT
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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
    Hydra Part Double Counterbalance Valve 3/4" In Line - 100-350Bar (Aluminium Body) - Approved Hydraulics
    Regular price £179.34 Ex VAT £215.21 Inc VAT
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    Double Counter Balance / Overcentre Valve 3/4" IN LINE Ally Body 100 - 350 bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 3/4"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: aluminium body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £179.34 Ex VAT £215.21 Inc VAT
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  • Group 3 Gear Pumps with 1:8 Taper Shaft (Threaded Ports) - Approved Hydraulics Limited
    Regular price From £227.74 Ex VAT From £273.29 Inc VAT
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    Group 3 Gear Pumps with 1:8 Taper Shaft (Threaded Ports)

    Key Features

    • Type: bi rotational external gear pump
    • Group: 3
    • Shaft: 1.8 taper
    • Configuration: single ; double ; triple options
    • Ports: threaded bsp options
    • Construction: cast iron end covers ; aluminium body
    • Applications: mobile hydraulics ; industrial power units
    Regular price From £227.74 Ex VAT From £273.29 Inc VAT
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  • Out of Stock
    Hydra Part HP-GP20 Power Take Off Gear Pumps - Approved Hydraulics
    Regular price From £137.94 Ex VAT From £165.53 Inc VAT
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    GP20 Power Take Off Gear Pumps

    Key Features

    • Use case: PTO driven hydraulic gear pump for mobile hydraulics; tipping; cranes; auxiliaries
    • Pump type: Hydraulic pump; see title for series and configuration
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price From £137.94 Ex VAT From £165.53 Inc VAT
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  • Out of Stock
    Hydra Part Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm - Approved Hydraulics
    Regular price £22.86 Ex VAT £27.44 Inc VAT
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    Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm

    Key Features

    • Application: tractor top link cylinder load holding
    • Type: double pilot operated check
    • Port size: 1/4' bsp
    • Rated flow: 25 to 50 l/min options
    • Use: prevents drift ; allows controlled retraction on pilot
    Regular price £22.86 Ex VAT £27.44 Inc VAT
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  • Solenoid Operated Check Valves - Pilot Operated - 70 L/min - 350bar - Checked in BOTH Directions - Approved Hydraulics Limited
    Regular price From £73.55 Ex VAT From £88.26 Inc VAT
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    Solenoid Operated Check Valves - Pilot Operated - 70 L/min - 350bar - Checked in 1 Direction Only

    Key Features

    • Type: solenoid operated pilot-to-open check valve
    • Flow rating: per model
    • Max pressure: 350 bar
    • Check function: checked in 1 direction
    • Function: holds load until solenoid pilot opens for reverse flow
    Regular price From £73.55 Ex VAT From £88.26 Inc VAT
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  • BSPP Adjustable Compensated Flow Control Valve - Approved Hydraulics Limited
    Regular price From £39.56 Ex VAT From £47.48 Inc VAT
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    BSPP Adjustable Compensated Flow Control Valve

    Key Features

    • Type: pressure-compensated adjustable flow control
    • Ports: as specified
    • Function: maintains set flow largely independent of load/pressure
    • Bypass: integrated check for free flow opposite direction
    • Use: stable actuator speed under varying loads
    Regular price From £39.56 Ex VAT From £47.48 Inc VAT
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  • Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body - Approved Hydraulics Limited
    Regular price £88.21 Ex VAT £105.86 Inc VAT
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    Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body

    Key Features

    • Type: double acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price £88.21 Ex VAT £105.86 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £9.33 Ex VAT £11.20 Inc VAT
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    1" BSP Male x 1" BSP Male Adaptor

    Key Features

    • Type: straight thread adaptor
    • Threads: 1 to 1 thread
    • Standard: BSPP parallel unless specified otherwise
    • Material: plated carbon steel
    • Use: join hoses; valves; or adapt port sizes
    Regular price £9.33 Ex VAT £11.20 Inc VAT
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  • 3/8" BSPT Tapered x 3/8" BSPT Tapered - Approved Hydraulics Limited
    Regular price £2.69 Ex VAT £3.23 Inc VAT
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    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 £2.69 Ex VAT £3.23 Inc VAT
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  • BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body - Approved Hydraulics Limited
    Regular price From £43.26 Ex VAT From £51.92 Inc VAT
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    BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body

    Key Features

    • Type: single acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price From £43.26 Ex VAT From £51.92 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 1/2-3/8 BSPP Flow Divider 15-40  L/Min - 210 Bar - Approved Hydraulics Limited
    Regular price £116.16 Ex VAT £139.40 Inc VAT
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    1/2-3/8 BSPP Flow Divider 15-40 L/Min - 210 Bar

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 3/8 thread
    • 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 £116.16 Ex VAT £139.40 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Pressure Reducing Module Valve - P to T (ZPR-6-D-P-1-210YM) - Approved Hydraulics
    Regular price £66.24 Ex VAT £79.49 Inc VAT
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    CETOP 3 Pressure Reducing Module Valve - P to T (ZPR-6-D-P-1-210YM)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: 3 way direct operated pressure reducing
    • Primary pressure: max 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 30 l/min
    • Ports: reduction in p ; relief to t
    • Typical use: reduce downstream circuit pressure below main line
    Regular price £66.24 Ex VAT £79.49 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 3/8" BSP Fixed Female Extended Adaptor - Approved Hydraulics Limited
    Regular price £2.05 Ex VAT £2.46 Inc VAT
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    1/4" BSP Male to 3/8" BSP Female Fixed & Extended

    Key Features

    • Type: hydraulic fitting
    • Threads: 1/4 to 3/8 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £2.05 Ex VAT £2.46 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £9.89 Ex VAT £11.87 Inc VAT
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    1/2" BSP Male x 1" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 1/2 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 £9.89 Ex VAT £11.87 Inc VAT
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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 £5.93 Ex VAT £7.12 Inc VAT
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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 £5.93 Ex VAT £7.12 Inc VAT
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  • 1" Bonded seal - Approved Hydraulics Limited
    Regular price £2.13 Ex VAT £2.56 Inc VAT
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    1" Bonded seal

    Key Features

    • Type: bonded sealing washer
    • Size: per selection
    • Construction: elastomeric sealing element bonded to metal washer
    • Use: high pressure face sealing on parallel threads/ports
    • Benefit: reliable leak-tight joint under vibration
    Regular price £2.13 Ex VAT £2.56 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £9.93 Ex VAT £11.92 Inc VAT
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    1/2" BSP Male x 3/4" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor (male to female)
    • Threads: 1/2 to 3/4 BSP
    • Swivel: captive nut allows hose connection without twisting
    • Seal: cone/washer seal depending on variant
    • Use: connect hoses where rotation during assembly is restricted
    Regular price £9.93 Ex VAT £11.92 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Coned Blanking Plug - Approved Hydraulics Limited
    Regular price £4.73 Ex VAT £5.68 Inc VAT
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    3/8" BSP Coned Blank Plug

    Key Features

    • Type: 60° coned seat blanking plug
    • Thread: 3/8 BSP
    • Seal: metal-to-metal on 60° cone
    • Material: plated steel for high pressure service
    • Use: safe isolation of unused ports
    Regular price £4.73 Ex VAT £5.68 Inc VAT
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    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSPT Tapered Adaptor - Approved Hydraulics Limited
    Regular price £3.60 Ex VAT £4.33 Inc VAT
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    1/2" BSP Male x 1/2" 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: 1/2 to 1/2 BSP
    • Sealing: taper thread seals with thread sealant; parallel with washer/bonded seal
    • Use: connect tapered ports to parallel hose/valve fittings
    Regular price £3.60 Ex VAT £4.33 Inc VAT
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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 £5.65 Ex VAT £6.78 Inc VAT
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    5/8" BSP Male x 5/8" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 5/8 to 5/8 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 £5.65 Ex VAT £6.78 Inc VAT
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    • 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.