• BSPP Single Acting Counterbalance Valves for Closed Centre with Steel Body
    Regular price From £53.16
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    BSPP Single Acting Counterbalance Valves for Closed Centre with Steel Body

    Key Features

    • Type: single acting counterbalance valve for closed 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 £53.16
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  • 1/4 Bonded seal - Approved Hydraulics Limited
    Regular price £0.83
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    1/4 Bonded seal

    Key Features

    • Part number: DOW14
    • Seal type: Bonded seal washer with elastomer insert
    • Size: 1/4 in
    • Materials: Steel outer ring with nitrile rubber sealing element
    • Typical use: Sealing BSP threaded hydraulic fittings; adaptors; and banjo bolts
    • Benefits: High pressure sealing; good resistance to hydraulic fluids
    Regular price £0.83
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  • 3/4 Bonded seal - Approved Hydraulics Limited
    Regular price £1.50
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    3/4 Bonded seal

    Key Features

    • Part number: DOW34
    • Seal type: Bonded seal washer with elastomer insert
    • Size: 3/4 in
    • Materials: Steel outer ring with nitrile rubber sealing element
    • Typical use: Sealing BSP threaded hydraulic fittings; adaptors; and banjo bolts
    • Benefits: High pressure sealing; reusable in many service applications
    Regular price £1.50
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  • 3/8BSPM - 3/4BSPM Ad
    Regular price £4.24
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    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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  • 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.

  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £4.86
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    3/4 BSP x 3/4 BSP M/M Ad

    Key Features

    • Type: hydraulic fitting
    • Threads: 3/4 to 3/4 thread
    • Material: plated carbon steel
    • Use: connect hydraulic components
    • Standard: BSP and related port forms as specified
    Regular price £4.86
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  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £5.39
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    1/4 BSP Male x 3/8 BSP Swivel Female

    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 £5.39
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  • Double cross relief valve 60L 1/2 BSPP 210 bar - steel body for OMP or OMR Hydraulic motors - Approved Hydraulics Limited
    Regular price £51.64
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    Double cross relief valve 60L 1/2 BSPP 210 bar - steel body for OMP or OMR Hydraulic motors

    Key Features

    • Type: double cross-line relief valve for hydraulic motors
    • Ports: 1/2 BSPP
    • Flow rating: per model
    • Max pressure: 210 bar
    • Compatibility: direct fit for Danfoss OMP/OMR style motors
    • Function: protects motor from shock and overpressure on both A/B lines
    • Body: steel; zinc plated
    Regular price £51.64
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  • 3/4 BSPP Relief Valve - 80 l/min - 50/350 bar - Steel Body
    Regular price £44.22
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    3/4 BSPP Relief Valve - 80 l/min - 50/350 bar - Steel Body

    Key Features

    • Type: pressure relief valve; direct line mounting
    • Ports: 3/4 BSPP
    • Max flow: 80 L/min
    • Adjustable range: 50–350 bar
    • Function: protects circuit by limiting pressure to setpoint
    • Body: steel with corrosion-resistant plating
    Regular price £44.22
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  • BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body
    Regular price From £47.20
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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 £47.20
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP Double Acting Counterbalance Valve for Open Centre with Steel Body
    Regular price From £73.04
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    BSPP Double Acting Counterbalance Valve for Open Centre with 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 From £73.04
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Tamper proof cap M10 - RED color
    Regular price £1.28
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    Tamper proof cap M10 - RED color

    Key Features

    • Type: tamper-proof cap for valve adjusters
    • Thread: M10
    • Colour: red for quick identification
    • Function: prevents unauthorised adjustment
    • Material: durable polymer or plated steel per variant
    Regular price £1.28
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  • 3/8 BSPP Sequence Valve - 40 L/Min - 70/350 Bar - Steel Body
    Regular price From £45.21
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    3/8 BSPP Sequence Valve - 40 L/Min - 70/350 Bar - Steel Body

    Key Features

    • Type: line-mounted sequence valve for staged actuation
    • Ports: 3/8 BSPP
    • Flow rating: 40 L/min
    • Pressure range: 70–350 bar adjustable
    • Operation: direct acting; fully balanced poppet design
    • Body: steel body for durability
    • Use: start secondary function only after primary reaches set pressure
    Regular price From £45.21
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    • Order by 3pm for Next Day Delivery
  • 1/2 BSPP Three-Way Flow Control Valve - Pressure Compensated - Exceending Flow To Pressure - Approved Hydraulics Limited
    Regular price £149.23
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    1/2 BSPP Three-Way Flow Control Valve - Pressure Compensated - Exceending Flow To Pressure

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/2 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 £149.23
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  • BSPP 3 Ports High Pressure Ball Valve - Approved Hydraulics Limited
    Regular price From £36.49
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    BSPP 3 Ports High Pressure Ball Valve

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: as specified
    • 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 From £36.49
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    • Order by 3pm for Next Day Delivery
  • Donaldson Hydraulic Return Filter Cartridge 25 Micron
    Regular price £22.09
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    Donaldson Hydraulic Return Filter Cartridge 25 Micron

    Key Features

    • Type: hydraulic return filter element
    • Rating: 25 micron filtration class
    • Media: cellulose or synthetic media options
    • Use: protect system from contamination on return line
    • Compatibility: fits designated filter head family
    Regular price £22.09
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    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Pilot Operated Relief Valve Module - A&B to T (Z-2-PB-10-VC-1-315) - Approved Hydraulics
    Regular price £125.34
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    CETOP 5 Pilot Operated Relief Valve Module - A&B to T (Z-2-PB-10-VC-1-315)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pilot operated relief a and b to t
    • Max operating pressure: 315 bar
    • Max flow: 100 l/min
    • Temp range: -20 c to +70 c
    • Weight: 3.1 kg
    • Channels: a ; b ; a+b vc option
    Regular price £125.34
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  • Hydra Part CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315) - Approved Hydraulics
    Regular price £97.24
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    CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pilot operated pressure relief p to t
    • Max operating pressure: 315 bar
    • Max flow: 100 l/min
    • Temp range: -20 c to +70 c
    • Weight: 2.6 kg
    • Typical use: system relief on cetop 5 stacks
    Regular price £97.24
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  • 1" BSP Female Blanking Cap
    Regular price £11.29
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    1" BSP Female Blanking Cap

    Key Features

    • Type: port blanking component
    • Thread: 1 BSP
    • Seal: washer or O-ring depending on seat style
    • Material: plated carbon steel
    • Use: temporary or permanent closure of ports
    Regular price £11.29
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  • 1/2 BSPT x 1/2 BSPT Tapered Adaptor
    Regular price £3.61
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    1/2 BSPT x 1/2 BSPT Tapered Adaptor

    Key Features

    • Type: adaptor converting parallel to tapered port standards
    • Threads: 1/2 to 1/2 thread
    • Standards: BSPP parallel and BSPT taper as applicable
    • Sealing: taper threads with sealant; parallel with washer/bonded seal
    • Use: connect BSPP components to BSPT ports or vice versa
    Regular price £3.61
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  • 3/4" BSP x 3/4" BSP Bulkhead Adaptor with Locknut - Approved Hydraulics Limited
    Regular price £3.71
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    1/4 BSP Bulk Head Adaptors (Supplied without nut)

    Key Features

    • Type: straight thread adaptor
    • Threads: 1/4 thread
    • Standard: BSPP parallel unless specified otherwise
    • Material: plated carbon steel
    • Use: join hoses; valves; or adapt port sizes
    Regular price £3.71
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    • Order by 3pm for Next Day Delivery
  • 1" BSP Male x 1" BSPT Male Tapered Adaptor
    Regular price £5.48
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    1" BSP Male x 1" BSPT Male Tapered Adaptor

    Key Features

    • Type: adaptor converting parallel to tapered port standards
    • Threads: 1 to 1 thread
    • Standards: BSPP parallel and BSPT taper as applicable
    • Sealing: taper threads with sealant; parallel with washer/bonded seal
    • Use: connect BSPP components to BSPT ports or vice versa
    Regular price £5.48
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  • Out of Stock
    1/2 BSP Male - 9/16 UNF Male SORB without "O" Ring
    Regular price £2.60
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    1/2 BSP Male - 9/16 UNF Male SORB without "O" Ring

    Key Features

    • Type: adaptor between SAE O-ring boss/UNF and BSP system
    • Threads: 1/2 to 9/16 thread
    • Seal: O-ring boss on SAE side; bonded washer or cone on BSP side
    • Note: some variants supplied without O-ring as stated
    • Use: interface US standard ports to BSP hoses/valves
    Regular price £2.60
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    • Order by 3pm for Next Day Delivery
  • 3/4" BSPT Male Tapered x 3/4" BSPT Male Tapered Adaptor
    Regular price £5.63
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    3/4" BSPT Male Tapered x 3/4" BSPT Male Tapered Adaptor

    Key Features

    • Type: adaptor converting parallel to tapered port standards
    • Threads: 3/4 to 3/4 thread
    • Standards: BSPP parallel and BSPT taper as applicable
    • Sealing: taper threads with sealant; parallel with washer/bonded seal
    • Use: connect BSPP components to BSPT ports or vice versa
    Regular price £5.63
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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 £7.24
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    1/4 BSP x M18 x 1.5 MM ISO6149 Adaptor

    Key Features

    • Type: straight thread adaptor
    • Threads: 1/4 to 1.5 thread
    • Standard: BSPP parallel unless specified otherwise
    • Material: plated carbon steel
    • Use: join hoses; valves; or adapt port sizes
    Regular price £7.24
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    • Order by 3pm for Next Day Delivery

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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.