• Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports) - Approved Hydraulics Limited
    Regular price £97.98
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    Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports)

    Key Features

    • Pump group: Group 2 external gear pump
    • Body: Aluminium body with cast iron end plates
    • Shaft: 1/8 taper keyed
    • Flange: 4 bolt European mount
    • Ports: Inlet 1/2 inch BSPP ; outlet 3/8 inch BSPP typical
    • Displacement range: ≈4 to 30 cc/rev options
    • Continuous pressure: Up to ~250 bar depending on size
    Regular price £97.98
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  • 80L-90L-100L-120L-150L control valve Pneumatic Kit  Cylinder Only (also 8EP3/4 kits)
    Regular price £97.20
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    80L-90L-100L-120L-150L control valve Pneumatic Kit Cylinder Only (also 8EP3/4 kits)

    Key Features

    • Pressure class: Typically 200-315 bar class
    Regular price £97.20
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  • Hydraulic Motors (MM Series) - Approved Hydraulics Limited
    Regular price From £97.08
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    Hydraulic Motors (MM Series)

    Key Features

    • Series: mm compact
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    • Features: shaft distribution flow ; compact volume ; low weight
    Regular price From £97.08
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  • Hydra Part 3 Port Solenoid Diverter Valve 1/2" 12/24vDC - Approved Hydraulics
    Regular price From £96.49
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    3 Port Closed Centre Solenoid Diverter Valve 1/2" 80LPM 12/24vDC

    Key Features

    • Type: 3 port 2 position diverter valve
    • Ports: 1/2" BSP
    • Actuation: solenoid 12V or 24V DC
    • Function: redirects flow between two circuits in closed centre systems
    • Mounting: line mounted body
    • Brand: Hydra Part; data sheet available
    Regular price From £96.49
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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.

  • Hydra Part 3/4"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar - Approved Hydraulics
    Regular price £96.38
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    3/4"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar

    Key Features

    • Type: dual cross line relief valve
    • Port size: 3/4"bsp
    • Rated flow: 80 lpm
    • Adjustment range: 130 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 £96.38
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  • Hydra Part Double Acting Cylinder 60mm Bore Rams - Approved Hydraulics
    Regular price From £96.16
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    Double Acting Hydraulic Cylinder 60mm Bore Rams

    Key Features

    • Bore: 60 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £96.16
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  • Biodegradable Hydraulic Oil, 20 Litres - Approved Hydraulics Limited
    Regular price £94.74
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    Biodegradable Hydraulic Oil, 20 Litres

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 20 Litres
    Regular price £94.74
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  • 2" BSP Female Swivel Elbow Hose Insert - Approved Hydraulics Limited
    Regular price £94.52
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    2" BSP Female Swivel Elbow Hose Insert

    Key Features

    • Thread: 2" bspp female swivel 60° cone
    • Form: 90° elbow ; hosetail insert for 2" id hose
    • Materials: mild steel ; stainless steel ; polypropylene options
    • Use: braided hose 1-wire ; 2-wire compatible
    • Typical standard: bs 5200 / iso 8434-6 style
    Regular price £94.52
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  • Hydra Part CETOP 5 Single Solenoid Control Valve NG06 - P to A & B to T (X - 11) - Approved Hydraulics
    Regular price From £93.38
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    CETOP 5 Single Solenoid Control Valve NG10 - P to A & B to T (X - 11)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Spool function: p to a ; b to t d spool
    • Nominal flow: 120 l/min
    • Max pressure: p ; a ; b 315 bar ; t 16 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Switch time: 50 to 70 ms
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £93.38
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  • Hydra Part CETOP 3 Pressure Reducing Module Valve - B to T (ZPR-6-D-B-1-30-210YM) - Approved Hydraulics
    Regular price £93.35
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    CETOP 3 Pressure Reducing Module Valve - B to T (ZPR-6-D-B-1-30-210YM)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Type: 3 way direct operated pressure reducing
    • Reduced port: b to t
    • Primary pressure: max 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 30 l/min
    • Use: branch pressure trimming on one work port
    Regular price £93.35
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  • Out of Stock
    Single Counterbalance Valve 3/8" In Line - 100-350Bar - Approved Hydraulics Limited
    Regular price £92.39
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    Single Counterbalance Valve 3/8" In Line - 100-350Bar

    Key Features

    • Type: single counterbalance ; overcentre valve
    • Port size: 3/8"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £92.39
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  • 150L Control Valve Tank Section 1" Port (TC)
    Regular price £92.24
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    150L Control Valve Tank Section 1" Port (TC)

    Key Features

    • Series: 150L GS sectional control valve
    • Section: outlet ; tank return
    • Main ports: P G 3/4 ; A ; B G 3/4 ; T ; C G 1
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £92.24
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  • MINI Power Pack  8.0 cc/r  Grp 1 pump
    Regular price £90.86
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    MINI Power Pack 8.0 cc/r Grp 1 pump

    Key Features

    • Pump group: group 1 external gear pump
    • Displacement: 8.0 cc/rev
    • Rotation: ccw
    • Use: mini hydraulic power pack builds
    • Compatibility: b14 mounting kits ; group 1 couplings
    Regular price £90.86
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  • MINI Power Pack  7 cc/r  Grp 1 pump
    Regular price £90.86
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    MINI Power Pack 7 cc/r Grp 1 pump

    Key Features

    • Pump group: group 1 external gear pump
    • Displacement: 7 cc/rev
    • Rotation: ccw
    • Use: mini hydraulic power pack builds
    • Compatibility: b14 mounting kits ; group 1 couplings
    Regular price £90.86
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  • Hydra Part SV80 Sequence Valve 3/4" Bsp - 80Lpm - 100-350 Bar - Approved Hydraulics
    Regular price £90.62
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    SV80 Sequence Valve 3/4" Bsp - 80Lpm - 100-350 Bar

    Key Features

    • Type: hydraulic sequence valve ; direct acting
    • Port size: 3/4" bsp
    • Rated flow: 80 lpm
    • Pressure setting: 100 to 350 bar
    • Function: opens secondary circuit after set pressure reached
    • Mounting: in line
    • Applications: dual actuator sequencing ; clamp then work
    Regular price £90.62
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  • Bearing Support for Group 2 Pump
    Regular price £90.56
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    Bearing Support for Group 2 Pump

    Key Features

    • Pump group: External gear pump ; Group 2
    • Shaft options: Ø18 mm parallel 6 mm key ; Ø22 mm parallel ; 1/8 taper
    • Radial load capacity: ≈318 daN at 1500 rpm
    • Rated lifetime: ≈3500 h at 1500 rpm at rated load
    • Lubrication: Grease to DIN 51502 MPF 1K-20
    • Mounting: Direct flanged between drive and pump ; takes belt or chain side load
    • Typical use: Protects pump bearings in pulley ; sprocket ; belt drives
    Regular price £90.56
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  • Hydra Part CETOP 5 single solenoid control valve NG10 All ports connected to X - Approved Hydraulics
    Regular price From £90.05
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    CETOP 5 single solenoid control valve NG10 All ports connected to X

    Key Features

    • Centre spool: all ports connected to x
    • Solenoid: single solenoid
    • Interface: iso 4401-05 cetop 5 ng10
    • Max flow: 120 lpm
    • Max pressure: p ; a ; b 315 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £90.05
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  • Hydra Part Top Link Double Pilot Check Valve 1/2"BSP  50Lpm - Approved Hydraulics
    Regular price £89.60
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    Top Link Double Pilot Check Valve 3/4"BSP

    Key Features

    • Type: double pilot operated check valve
    • Threads: 3/4" BSP
    • Function: locks load until pilot pressure releases checks
    • Use: load holding on cylinders and top links
    • Pressure: 315 to 350 bar class
    Regular price £89.60
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  • Hydra Part Double Acting Cylinder 50mm Bore Rams - Approved Hydraulics
    Regular price From £89.57
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    Double Acting Hydraulic Cylinder 50mm Bore Rams

    Key Features

    • Bore: 50 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £89.57
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    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Inlet Section -S
    Regular price £88.58
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    80L Control Valve Inlet Section -S

    Key Features

    • Valve size: 80 l/min
    • Section: inlet section -s
    • Features: integral relief ; power beyond port
    • Use: start of sectional valve stack
    • Application: hydraulic system component
    Regular price £88.58
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  • 80L Control Valve Inlet Section AC -L/H (Old No 30085749)
    Regular price £88.58
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    80L Control Valve Inlet Section AC -L/H (Old No 30085749)

    Key Features

    • Section type: left inlet (ac)
    • Compatibility: 80l gs sectional control valve
    • Old reference: 30085749
    • Includes: direct acting pressure relief valve
    • Relief range (typical): 25 ; 315 bar adjustable
    • Function: main pump inlet ; overpressure protection
    Regular price £88.58
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  • 80L Control Valve Right Inlet Section 1/2" With PRV (Type BC) - Approved Hydraulics Limited
    Regular price £88.58
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    80L Control Valve Right Inlet Section 1/2" With PRV (Type BC)

    Key Features

    • Series: 80L GS sectional control valve
    • Section: right inlet section with PRV
    • Port size: 1/2 BSP
    • Main ports: P G 1/2 ; A ; B G 1/2 ; T ; C G 3/4
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £88.58
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    • Order by 3pm for Next Day Delivery
  • MINI Power Pack  1.1 cc/r  Grp 1 pump - Approved Hydraulics Limited
    Regular price £86.50
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    MINI Power Pack 1.1 cc/r Grp 1 pump

    Key Features

    • Pump group: group 1 external gear pump
    • Displacement: 1.1 cc/rev
    • Rotation: ccw
    • Use: mini hydraulic power pack builds
    • Compatibility: b14 mounting kits ; group 1 couplings
    Regular price £86.50
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  • Out of Stock
    Solenoid Operated Diverter Valve, 3 Ways, 3/4" BSP, Open Centre (Various Voltage) - Approved Hydraulics Limited
    Regular price £86.46
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    Solenoid Operated Diverter Valve, 3 Ways, 3/4" BSP, Open Centre (Various Voltage)

    Key Features

    • Ways: 3 way
    • Ports: 3/4" bspp
    • Centre: open centre body
    • Voltage options: 12 vdc ; 24 vdc
    • Use: select between two circuits
    Regular price £86.46
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Hydra Part for Professional Hydraulic Applications

Discover quality hydra part 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 lever operated monoblock valves, cetop 3 spares, scanreco spares accessories, scanreco 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.