• Out of Stock
    Hydra Part Top Link Double Pilot Check Valve 1/4"BSP - 25Lpm - Approved Hydraulics
    Regular price £24.95
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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 £24.95
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  • Solenoid Operated Check Valves - Pilot Operated - 70 L/min - 350bar - Checked in BOTH Directions - Approved Hydraulics Limited
    Regular price From £111.77
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    Solenoid Operated Check Valves - Pilot Operated - 70 L/min - 350bar - Checked in BOTH Directions

    Key Features

    • Type: solenoid operated pilot-to-open check valve
    • Flow rating: per model
    • Max pressure: 350 bar
    • Check function: checked in both directions
    • Function: holds load until solenoid pilot opens for reverse flow
    Regular price From £111.77
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  • 1/2 BSPP CETOP 5 Single Manifold - 80 L/Min - 20/210 Bar - Aluminium Body
    Regular price £71.39
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    1/2 BSPP CETOP 5 Single Manifold - 80 L/Min - 20/210 Bar - Aluminium Body

    Key Features

    • Type: single subplate manifold for CETOP 5 (NG10) valves
    • Ports: 1/2 BSPP
    • Max flow: 80 L/min
    • Pressure rating: 20–210 bar
    • Body: aluminium body
    • Use: mount a single directional valve with side ports
    Regular price £71.39
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  • BSPP Relief Valve upto 30 L/min - Steel Body
    Regular price From £24.27
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    BSPP Relief Valve upto 30 L/min - Steel Body

    Key Features

    • Type: hydraulic component
    • Design: built for mobile hydraulic service
    • Use: as specified by product title
    • Body: corrosion protected steel or aluminium per model
    Regular price From £24.27
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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 £11.20
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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 £11.20
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  • Double Acting Pilot Check Valves
    Regular price From £44.88
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    Double Acting Pilot Check Valves

    Key Features

    • Function: locks cylinder in position until piloted open
    • Ports: 1/4" ; 3/8" ; 1/2" bspp options
    • Pilot ratio: 3.1 ; 4.1 options
    • Cracking pressure: 3 ; 5 bar typical
    • Use: load holding on da cylinders
    • Mounting: in line block
    Regular price From £44.88
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  • 1/2-3/8 BSPP Flow Divider 15-40  L/Min - 210 Bar
    Regular price £126.73
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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 £126.73
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  • 3/8" BSPP Double Acting Pilot Check Valve - Approved Hydraulics Limited
    Regular price £21.17
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    1/4 BSPP Double Acting Pilot Check Valve

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/4 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 £21.17
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.46
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    1/4 BSP Male x 3/8 BSP Male Adaptor

    Key Features

    • Type: straight thread adaptor
    • Threads: 1/4 to 3/8 thread
    • Standard: BSPP parallel unless specified otherwise
    • Material: plated carbon steel
    • Use: join hoses; valves; or adapt port sizes
    Regular price £6.46
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £11.87
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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 £11.87
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  • 1" Bonded seal - Approved Hydraulics Limited
    Regular price £2.56
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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 £2.56
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.78
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    1/2" BSP Male x 3/4" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 1/2 to 3/4 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 £6.78
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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 £4.80
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    1/4" BSP Male to 1/2 BSP Female Pressure Guage Adaptor

    Key Features

    • Type: pressure gauge adaptor
    • Threads: 1/4 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 £4.80
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  • 3/8" BSP Male x 3/8" BSPT Tapered Adaptor
    Regular price £4.00
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    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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  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £4.52
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    1/4" BSP Male x 1/4" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor (male to female)
    • Threads: 1/4 to 1/4 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 £4.52
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.78
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    1/2 BSP Male x 5/8 BSP Male Adaptor

    Key Features

    • Type: inline adaptor male to male
    • Threads: 1/2 BSP 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 extend fittings
    Regular price £6.78
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    • Order by 3pm for Next Day Delivery
  • PTO UNI (3 Bolts) to PUMP EN/ISO (4 Bolts) adapter Complete With Studs And Gaskets
    Regular price £83.84
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    PTO UNI (3 Bolts) to PUMP EN/ISO (4 Bolts) adapter Complete With Studs And Gaskets

    Key Features

    • Function: adapts UNI 3-bolt PTO to ISO 4-bolt pump flange
    • Includes: studs and gaskets for installation
    • Benefit: cross-standard PTO–pump compatibility
    • Use case: mount ISO 4-bolt pump on UNI 3-bolt PTO
    • Mounting pattern: UNI (3 holes) ↔ ISO (4 holes)
    • Application: direct-mount pump drive on truck PTOs
    Regular price £83.84
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  • GASKET ZF (0,5MM) - 4 BOLT
    Regular price £1.36
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    GASKET ZF (0,5MM) - 4 BOLT

    Key Features

    • Type: ZF PTO / pump interface gasket
    • Thickness: 0.5 mm
    • Pattern: 4-bolt mounting
    • Function: seals gearbox-to-PTO or PTO-to-pump interface
    • Service note: replace whenever PTO/pump is removed
    • Benefit: prevents oil leakage and maintains system integrity
    Regular price £1.36
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  • ABER B3 Gear Pumps
    Regular price From £307.48
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    ABER B3 Gear Pumps

    Key Features

    • Displacement: ~42–102 cm³/rev
    • Max pressure: up to ~300 bar
    • Mount: ISO 4-bolt (pump PTO interface)
    • Shaft: 8-tooth spline
    • Rotation: CW/CCW options
    • Ports: BSP threaded (1"–1 1/4")
    • Application: high-flow truck hydraulics (tippers, cranes)
    Regular price From £307.48
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  • 24VDC Proportional Solenoid PWM For Scanreco Mod10  Actuator Valve 14mm Dia Hole x 39mm Long
    Regular price £69.89
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    24VDC Proportional Solenoid PWM For Scanreco Mod10 Actuator Valve 14mm Dia Hole x 39mm Long

    Key Features

    • Voltage: 24 vdc
    • Control: pwm proportional
    • For: scanreco mod10 actuator valve
    • Core size: 14 mm id x 39 mm long
    • Application: hydraulic attachment component
    Regular price £69.89
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  • Pilot Feed Adaptor And Blanking Cap Kit For Servo Module Tie Rods Scanreco - Approved Hydraulics Limited
    Regular price £26.40
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    Pilot Feed Adaptor And Blanking Cap Kit For Servo Module Tie Rods Scanreco

    Key Features

    • Function: pilot feed adaptor ; blanking cap kit
    • Use: servo module tie rods
    • Benefit: clean pressure tapping ; sealed blanking
    • Compatibility: scanreco servocontrol stacks
    • Application: hydraulic attachment component
    Regular price £26.40
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  • Hydraulic Power Pack With Starter 24V DC - 2.0kW - P & T Only - 160bar Preset - Approved Hydraulics Limited
    Regular price From £194.24
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    Hydraulic Power Pack With Starter 24V DC - 2.0kW - P & T Only - 160bar Preset

    Key Features

    • Motor: 2.0 kw dc
    • Voltage: 24 vdc
    • Ports: p ; t only
    • Pressure preset: 160 bar
    • Use: feed external valve stack
    Regular price From £194.24
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  • Out of Stock
    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 2x Double Acting CETOP - 160bar Preset
    Regular price From £337.74
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    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 2x Double Acting CETOP - 160bar Preset

    Key Features

    • Motor: 1.6 kw dc
    • Valving: 2 x double acting cetop stack
    • Starter: solenoid relay included
    • Pressure preset: 160 bar
    • Supply: 12 vdc ; 24 vdc
    • Use: two circuit da operation
    Regular price From £337.74
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  • Solenoid for Mini Power Pack NC and NO Cartridges with Connector
    Regular price From £11.83
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    Solenoid for Mini Power Pack NC and NO Cartridges with Connector

    Key Features

    • Use: solenoid for nc ; no cartridges
    • Voltage options: 12 vdc ; 24 vdc
    • Connection: din 43650 connector included
    • Duty: 100% ed
    • Ingress: ip65 with gasket
    Regular price From £11.83
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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.