• Adjustable Flow Valve Cartridge
    Regular price £13.00
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    Adjustable Flow Valve Cartridge

    Key Features

    • Type: adjustable needle flow control
    • Cavity: sae 08 ; 3/4-16 unf
    • Use: meter in ; meter out flow tuning
    • Pressure rating: up to 350 bar class
    • Application: mini power pack manifold
    Regular price £13.00
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  • Microswitch (Normally closed) M14 x 1.5 thread
    Regular price £12.91
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    Microswitch (Normally closed) M14 x 1.5 thread

    Key Features

    • Part number: 20010687
    • Contact form: Normally closed
    • Mounting thread: M14 x 1.5
    • Function: Mechanical switch for position feedback in hydraulic controls
    • Typical use: Used in valve microswitch kits for spool position indication
    • Installation: Threaded body mounts into bracket or valve accessory kit
    Regular price £12.91
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  • 3/8" Hose Burst Valve in a Male - Female Housing
    Regular price £12.68
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    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 £12.68
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  • Aluminum Flange For Mounting kit for frame 71 B14 AC motor
    Regular price £12.64
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    Aluminum Flange For Mounting kit for frame 71 B14 AC motor

    Key Features

    • Material: aluminum
    • Interface: iec b14 motor flange
    • Frame size: 71
    • Use: mount ac motor to central manifold ; pump
    • Compatibility: group 1 pump ; matching semi couplings
    Regular price £12.64
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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.

  • Motor side Coupling For Mounting kit for frame 80 B14 AC motor
    Regular price £12.64
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    Motor side Coupling For Mounting kit for frame 80 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 80
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £12.64
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    • Order by 3pm for Next Day Delivery
  • 3/8" Cylinder Breather
    Regular price £12.59
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    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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  • 45L Monobloc Valve High pressure carry over plug 1/2" (G-S)
    Regular price £12.55
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    45L Monobloc Valve High pressure carry over plug 1/2" (G-S)

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 1/2" bsp
    • Compatibility: 45l monoblock valves
    • Use case: connect to downstream valve in series
    • System rating: for systems up to 315 bar with host valve
    Regular price £12.55
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  • Electro Pneumatic 3/2 valve (N/O) without coil for 8EP3 for direct into cylinder kit (G-S)
    Regular price £12.48
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    Electro Pneumatic 3/2 valve (N/O) without coil for 8EP3 for direct into cylinder kit (G-S)

    Key Features

    • Voltage: 12 vdc
    • Power: 3 w rating
    • Hole: 9 mm through-bore
    • Body length: 30 mm
    • Ingress protection: IP65
    • Duty: 100% ed
    • Use: electro-pneumatic 8EP3/8EP4 valves
    Regular price £12.48
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    • Order by 3pm for Next Day Delivery
  • 50L Control Valve 2 Bank Tie Rod Kit (3 Rods / kit) M8x1.25 x 166mm Long
    Regular price £12.28
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    50L Control Valve 2 Bank Tie Rod Kit (3 Rods / kit) M8x1.25 x 166mm Long

    Key Features

    • Kit: tie rods for 2 bank assembly . 3 rods per kit
    • Thread: m8x1.25
    • Rod length: 166 mm
    • Compatibility: 50l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £12.28
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  • Hydra Part Poppet Check Valve 3/8" 50Lpm, 400 Bar Max Pressure - Approved Hydraulics
    Regular price £12.25
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    Poppet Check Valve 3/8" 50Lpm, 400 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 3/8' bsp
    • Max flow: 50 l/min
    • Max pressure: 400 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £12.25
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  • Banjo Tubes - Approved Hydraulics Limited
    Regular price £12.06
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    1/2" Banjo Body To 15mm Tube x 100mm Long

    Key Features

    • Interface: banjo ring for 1/2" banjo bolt
    • Tube end: 15 mm OD tube to suit 15L DIN 2353 compression fittings
    • Overall length: 100 mm tube length
    • Working pressure: up to 350 bar typical for steel banjo tubes
    • Material: zinc plated steel body and tube
    • Use: mount cylinders or valves where compact banjo connection is needed
    Regular price £12.06
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    • Order by 3pm for Next Day Delivery
  • Hydra Part Poppet Check Valve 1/2" 90Lpm, 350 Bar Max Pressure - Approved Hydraulics
    Regular price From £12.06
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    Poppet Check Valve 1/2" 90Lpm, 350 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 1/2' bsp
    • Max flow: 90 l/min
    • Max pressure: 350 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price From £12.06
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    • Order by 3pm for Next Day Delivery
  • 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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  • 1" BSP Spy Eye Level Gauge (Clear)
    Regular price £11.65
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    1" BSP Spy Eye Level Gauge (Clear)

    Key Features

    • Type: Threaded sight level gauge for hydraulic tanks
    • Thread: 1" BSP
    • Seal: Supplied with rubber sealing washer
    • Head: Hex head with shoulder for seating
    • Colour: Clear
    • Use: Visual oil level indication at reservoir wall
    Regular price £11.65
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  • 1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £11.39
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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 £11.39
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    • Order by 3pm for Next Day Delivery
  • Motor side Coupling For Mounting kit for frame 71 B14 AC motor
    Regular price £11.21
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    Motor side Coupling For Mounting kit for frame 71 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 71
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £11.21
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £11.17
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    HP-C20 Tandem Gear Pump Seal Kit. Suits Front 067 or Rear 066

    Key Features

    • Compatibility: Hydra Part Group 2 tandem pumps using front code 067 ; rear code 066 interfaces
    • Intended use: renew the sealing set when splitting tandem sections or replacing shaft seal
    • Typical kit contents: shaft seal ; o rings ; interface seals used between tandem pump sections
    • Notes on assembly: ensure rear shaft selection matches torque from front section during build
    • Applications: tandem pumps on tippers ; loaders ; auxiliary hydraulic circuits
    • Variant note: front 067 ; rear 066 code covers common Group 2 tandem configurations
    Regular price £11.17
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  • Relief valve 50 to 250 Bar Range
    Regular price £11.15
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    Relief valve 50 to 250 Bar Range

    Key Features

    • Adjustment range: 50 ; 250 bar
    • Cavity: sae 08 ; 3/4-16 unf
    • Function: pump pressure protection to tank
    • Max working: up to 350 bar class
    • Application: mini power pack manifold
    Regular price £11.15
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part High Pressure Carry Over for Z50/Z80 Valve - Approved Hydraulics
    Regular price £11.09
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    • Delivery to UK & Ireland

    High Pressure Carry Over for Z50/Z80 Valve

    Key Features

    • Accessory: high pressure carry over ; power beyond sleeve
    • Compatibility: z50 ; z80 monoblock valves
    • Use: enables downstream circuits ; converts open centre to power beyond
    • Installation: fits in end section kit ; see valve data sheet
    • Working pressure: as per base valve rating ; up to 250 bar typical
    • Notes: requires appropriate return to tank path for excess flow
    Regular price £11.09
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    • Order by 3pm for Next Day Delivery
  • Mini Pack Mounting Bracket / Foot
    Regular price £11.03
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    Mini Pack Mounting Bracket / Foot

    Key Features

    • Function: foot bracket for mounting mini power pack
    • Material: steel
    • Use: secure pack to base ; chassis
    • Holes: pre drilled slots for fixings
    • Application: hydraulic system component
    Regular price £11.03
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    • Order by 3pm for Next Day Delivery
  • Weld collars 123mm (AC Motors)
    Regular price £10.85
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    Weld collars 123mm (AC Motors)

    Key Features

    • Size: 123 mm
    • Function: weld on collar for tank neck
    • Use: mount 120 mm ; 123 mm filler necks to custom reservoirs
    • Material: steel
    • Applications: power pack tanks ; bespoke fabrications
    Regular price £10.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Weld collars 120mm (DC Motors)
    Regular price £10.85
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    Weld collars 120mm (DC Motors)

    Key Features

    • Size: 120 mm
    • Function: weld on collar for tank neck
    • Use: mount 120 mm ; 123 mm filler necks to custom reservoirs
    • Material: steel
    • Applications: power pack tanks ; bespoke fabrications
    Regular price £10.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L TIE ROD KIT (3 Rods / kit) 1 Bank  M8x1.25  128mm long
    Regular price £10.32
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    50L TIE ROD KIT (3 Rods / kit) 1 Bank M8x1.25 128mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 1 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 128 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 50l family
    • Variants: 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 bank options
    Regular price £10.32
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  • MR motorcover used on 32mm shaft conversion
    Regular price £10.26
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    MR motorcover used on 32mm shaft conversion

    Key Features

    • Component: motor cover for MR motor 32 mm shaft conversion
    • Function: protects front seal area and bearing alignment
    • Use: fitted during conversion to 32 mm shaft
    • Benefit: clean finish and debris protection
    • Compatibility: MR series housings
    Regular price £10.26
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Hydra Part

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.