• 24V Elec/Air Solenoid for 8EP3 -4 kit  4.8W IP65 100% ED - Coil 9mm Hole x 30mm long
    Regular price £10.03
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    24V Elec/Air Solenoid for 8EP3 -4 kit 4.8W IP65 100% ED - Coil 9mm Hole x 30mm long

    Key Features

    • Voltage: 24 vdc
    • Power: 4.8 w
    • Protection: ip65
    • Duty cycle: 100% ed
    • Core tube fit: 9 mm bore ; 30 mm length
    • Application: 8ep3 ; 8ep4 electro pneumatic kits
    Regular price £10.03
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    • Order by 3pm for Next Day Delivery
  • Euro Plug 2 Pin To Uk 3 Pin Plug Adapter
    Regular price £9.96
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    Euro Plug 2 Pin To Uk 3 Pin Plug Adapter

    Key Features

    • Input plug types: CEE 7/16 Europlug 2 pin ; CEE 7/7 Schuko E.F depending on model
    • Output socket: BS 1363 Type G 3 pin
    • Rating: 13 A 250 Vac
    • Fuse: 13 A BS 1362
    • Standard: BS 8546.2016+A1.2018 travel adaptor specification
    • Safety features: shuttered outlets ; insulated construction
    • Function: adapter only ; no voltage conversion
    • Typical use: power EU equipment from UK mains 230 Vac
    Regular price £9.96
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  • 1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £9.66
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    1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £9.66
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  • Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-9000 Psi (600 Bar) 1/4" Rear Entry - Approved Hydraulics
    Regular price £9.42
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    63mm Glycerine Hydraulic Pressure Gauge 0-9000 Psi (600 Bar) 1/4" Rear Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-9000 psi ( 600 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £9.42
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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.

  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-2000 Psi (140 Bar) 1/4" Rear Entry - Approved Hydraulics
    Regular price £9.42
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    63mm Glycerine Hydraulic Pressure Gauge 0-2000 Psi (140 Bar) 1/4" Rear Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-2000 psi ( 140 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £9.42
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    • Delivery to UK & Ireland
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  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/4" Bottom Entry - Approved Hydraulics
    Regular price £9.42
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    • Delivery to UK & Ireland

    63mm Glycerine Hydraulic Pressure Gauge 0-6000 Psi (400 Bar) 1/4" Bottom Entry

    Key Features

    • Dial: 63 mm
    • Filling: glycerine filled
    • Entry: 1/4\" bsp bottom entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-6000 psi ( 400 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £9.42
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-2000 Psi (140 Bar) 1/4" Bottom Entry - Approved Hydraulics
    Regular price £9.42
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    • Delivery to UK & Ireland

    63mm Glycerine Hydraulic Pressure Gauge 0-2000 Psi (140 Bar) 1/4" Bottom Entry

    Key Features

    • Dial diameter: 63 mm
    • Connection: 1/4' bsp bottom entry
    • Case: stainless steel aisi 304
    • Window: acrylic
    • Fill: glycerine 99.5 percent
    • Accuracy: class 1.6
    • Range: 0-2000 psi (140 bar) 1/4' bottom entry
    Regular price £9.42
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part 63mm Glycerine Hydraulic Pressure Gauge 0-360 Psi (25 Bar) 1/4" Bottom Entry - Approved Hydraulics
    Regular price £9.42
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    • Delivery to UK & Ireland

    63mm Glycerine Hydraulic Pressure Gauge 0-360 Psi (25 Bar) 1/4" Bottom Entry

    Key Features

    • Dial diameter: 63 mm
    • Connection: 1/4' bsp bottom entry
    • Case: stainless steel aisi 304
    • Window: acrylic
    • Fill: glycerine 99.5 percent
    • Accuracy: class 1.6
    • Range: 0-360 psi (25 bar) 1/4' bottom entry
    Regular price £9.42
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    • Order by 3pm for Next Day Delivery
  • 3/8" Hose Burst Valve Cartridge - Approved Hydraulics Limited
    Regular price £9.24
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    3/8" Hose Burst Valve Cartridge

    Key Features

    • Function: hose rupture protection check valve
    • Port size: 3/8" cavity
    • Use: locks flow on line failure
    • Install: screw in cartridge to cylinder port
    • Application: hydraulic system component
    Regular price £9.24
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    • Order by 3pm for Next Day Delivery
  • M8 Clevis With 8mm Pin
    Regular price £9.23
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    M8 Clevis With 8mm Pin

    Key Features

    • Thread: M8 female body
    • Pin: 8 mm supplied
    • Use: linkage end ; lever connection
    • Retain: split pin / circlip typical
    • Application: hydraulic component
    Regular price £9.23
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    • Order by 3pm for Next Day Delivery
  • Filter Housing Gasket
    Regular price £9.19
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    Filter Housing Gasket

    Key Features

    • Function: seals the interface between hydraulic filter housing and cover to prevent leaks
    • Compatibility: for Hydra Part filter housing family reference CCJUN type
    • Intended use: gasket replacement during element changes or service
    • Applications: tank return ; pressure or suction filter assemblies
    • Service note: replace at each element change to maintain seal integrity
    • Material note: select elastomer compatible with system oil and temperature
    Regular price £9.19
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    • Order by 3pm for Next Day Delivery
  • 3/8" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptor
    Regular price £9.18
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    3/8" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: 90°
    Regular price £9.18
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    • Order by 3pm for Next Day Delivery
  • 1" BSP Spy Eye Level Gauge (Black)
    Regular price £9.11
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    1" BSP Spy Eye Level Gauge (Black)

    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: Black
    • Use: Visual oil level indication at reservoir wall
    Regular price £9.11
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  • 1/4" Cylinder Breather
    Regular price £9.08
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    1/4" Cylinder Breather

    Key Features

    • Thread: 1/4" BSP
    • Function: vents cylinder/actuator to atmosphere
    • Element: porous filter to block dust ingress
    • Benefit: prevents vacuum build-up and moisture accumulation
    • Use: protects seals and internal surfaces during stroke
    Regular price £9.08
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  • CARRY OVER PLUG For AK 50 Control Valve
    Regular price £8.86
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    CARRY OVER PLUG For AK 50 Control Valve

    Key Features

    • Function: power beyond sleeve ; isolates P from T in outlet section
    • Valve family: AK 50 sectional control valves
    • Porting: provides high pressure carry over to downstream valve
    • Installation: fit in outlet body ; tank line must remain to T1.T2
    • Use: extend circuits ; add additional valve stack safely
    Regular price £8.86
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  • 3/4" BSP Female Swivel Blanking Cap
    Regular price £8.84
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    • Delivery to UK & Ireland

    3/4" BSP Female Swivel Blanking Cap

    Key Features

    • Thread size: 3/4 in BSP female swivel
    • Function: Blanking cap to seal unused ports or hose ends
    • Connection style: Swivel nut style for easy installation and alignment
    • Sealing: Designed to seal against mating face with washer or bonded seal
    • Typical use: Hydraulic system maintenance; testing; and contamination prevention
    • Application: BSP threaded fittings and adaptors in fluid power systems
    Regular price £8.84
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part Poppet Check Valve 1/4" 30Lpm, 400 Bar Max Pressure - Approved Hydraulics
    Regular price £8.57
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    Poppet Check Valve 1/4" 30Lpm, 400 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 1/4' bsp
    • Max flow: 30 l/min
    • Max pressure: 400 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £8.57
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor
    Regular price £8.22
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    3/8" Port, Straight, 30mm PCD, Female Gear Pump Adaptor

    Key Features

    • Thread: 3/8" BSP
    • Angle: Straight
    Regular price £8.22
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Check valve Cartridge
    Regular price £7.92
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    Check valve Cartridge

    Key Features

    • Type: screw in cartridge check valve
    • Cavity: sae 08 ; 3/4-16 unf
    • Function: permits flow 1 -> 2 ; blocks reverse
    • Cracking pressure: 0.3 bar class
    • Use: backflow prevention ; load holding in mini power packs
    Regular price £7.92
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Male to Female Pressure Gauge Adapters
    Regular price From £7.16
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    Male to Female Pressure Gauge Adapters

    Key Features

    • Type: male to female pressure gauge adaptor
    • Thread: bsp
    • Use: connect 1/4 ; 3/8 ; 1/2" gauge threads to system ports
    • Material: plated steel or brass per size
    • Sizes: common sizes stocked ; see options
    Regular price From £7.16
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    • Order by 3pm for Next Day Delivery
  • 1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors
    Regular price £6.88
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    • Delivery to UK & Ireland

    1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 30 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £6.88
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    • Order by 3pm for Next Day Delivery
  • 3/8 BANJO BOLT (35mm long) - Approved Hydraulics Limited
    Regular price £6.73
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    1/2 BANJO BOLT

    Key Features

    • Part number: BJBOLT-08
    • Bolt size: 1/2 in banjo bolt
    • Connection type: Hollow banjo bolt for banjo body fittings
    • Flow path: Cross drilled bolt shank for fluid transfer through banjo
    • Typical use: Hydraulic hose or tube banjo connections in compact spaces
    • Sealing method: Requires sealing washers either side of banjo body
    Regular price £6.73
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  • Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 230mm Long - Black Plastic Handle
    Regular price £6.59
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    Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 230mm Long - Black Plastic Handle

    Key Features

    • Thread: M10
    • Lever length: 230 mm
    • Grip: black plastic knob
    • Compatibility: 45 l ; 80 l ; 90 l ; 100 l ; 120 l ; 150 l ; 240 l valve families
    • Application: hydraulic component
    Regular price £6.59
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    • Order by 3pm for Next Day Delivery
  • 100L Control Valve  A & B Port Reliefs Blanking Plug
    Regular price £6.58
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    100L Control Valve A & B Port Reliefs Blanking Plug

    Key Features

    • Part: blanking plug for a ; b service port relief cavities
    • Compatibility: 100l sectional control valve
    • Function: blocks relief cavity when relief not fitted
    • Use: system using external over pressure protection
    • Maintenance: service replacement component
    Regular price £6.58
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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.