• 4L Plastic Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £18.79
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    4L Plastic Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 4 l
    • Neck flange: 123 mm ac
    • Material: plastic
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £18.79
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  • 45L & 50L  Control Valve Protection Cap SLCZ  (When Lever Assy Removed) (G-S)
    Regular price £18.72
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    45L & 50L Control Valve Protection Cap SLCZ (When Lever Assy Removed) (G-S)

    Key Features

    • Function: protection cap for spool end when lever assembly removed
    • Compatibility: 45l ; 50l control valves
    • Purpose: seals against dust and moisture ingress
    • Use: when converting to remote cable ; pneumatic or pilot control
    • Installation: fits lever box mounting pattern
    Regular price £18.72
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  • 45L Monobloc Valve Double Acting Spool Type 1 (G)
    Regular price £18.62
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    45L Monobloc Valve Double Acting Spool Type 1 (G)

    Key Features

    • Valve: 45 L/min monoblock directional valve
    • Spool type: G ; double acting cylinder spool
    • Center: Spring centered to neutral
    • Use: Double acting cylinders on compact hydraulic systems
    • Mounting: Monoblock casting with work ports
    Regular price £18.62
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  • 80L TIE ROD KIT (4 Rods / kit) 6 Bank  M8x1.25 339mm long
    Regular price £18.53
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    80L TIE ROD KIT (4 Rods / kit) 6 Bank M8x1.25 339mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 6 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 339 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 80l family
    • Variants: 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 bank options
    Regular price £18.53
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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.

  • 80L TIE ROD KIT (4 Rods / kit) 5 Bank M8x1.25 298mm long
    Regular price £18.53
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    80L TIE ROD KIT (4 Rods / kit) 5 Bank M8x1.25 298mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 5 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 298 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 80l family
    • Variants: 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 bank options
    Regular price £18.53
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  • 90L Monobloc Valve 3/4" High Pressure Carry Over Plug
    Regular price £18.53
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    90L Monobloc Valve 3/4" High Pressure Carry Over Plug

    Key Features

    • Function: power beyond ; feeds downstream valve
    • Thread: 3/4" bsp
    • Compatibility: 90l monoblock valves
    • Use case: convert open center valve to series operation
    • System rating: use with host valves up to 315 bar
    Regular price £18.53
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    • Order by 3pm for Next Day Delivery
  • 50L TIE ROD KIT (3 Rods / kit) 7 Bank   M8x1.25 356 mm long
    Regular price £18.44
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    50L TIE ROD KIT (3 Rods / kit) 7 Bank M8x1.25 356 mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 7 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 356 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 £18.44
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12V Elec/Air Solenoid Coil for 8EP3 -4 kit 3W IP65 100% ED - Coil 9mm hole x 30mm Long C/w with Flying Leads Connection
    Regular price £18.13
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    12V Elec/Air Solenoid Coil for 8EP3 -4 kit 3W IP65 100% ED - Coil 9mm hole x 30mm Long C/w with Flying Leads Connection

    Key Features

    • Voltage: 12 vdc
    • Power: 3 w
    • Hole: 9 mm through-bore
    • Body length: 30 mm
    • Ingress: ip65
    • Duty: 100% ed
    • Connection: flying leads
    • Use: 8ep3 ; 8ep4 electro pneumatic kits
    Regular price £18.13
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    • Order by 3pm for Next Day Delivery
  • 45L Monobloc Valve Single Acting Spring Kit (G) - Approved Hydraulics Limited
    Regular price £18.05
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    45L Monobloc Valve Single Acting Spring Kit (G)

    Key Features

    • Purpose: spring return kit for single acting spools
    • Compatibility: 45l monobloc valve series
    • Operation: centers spool in neutral after actuation
    • Use: required for type 3 ; type 4 single acting spools
    • Maintenance: service replacement kit
    Regular price £18.05
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  • Motor side Coupling For Mounting kit for frame 100/112 B14 AC motor - Approved Hydraulics Limited
    Regular price £17.86
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    Motor side Coupling For Mounting kit for frame 100/112 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 100/112
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £17.86
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  • 1/2" Cylinder Breather
    Regular price £17.82
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    1/2" Cylinder Breather

    Key Features

    • Thread: 1/2" NPT
    • Function: vents cylinder while filtering intake air
    • Benefit: balances pressure; reduces moisture and dust ingress
    • Element: integrated breather element (high-flow)
    • Use: hydraulic cylinders; small reservoirs
    Regular price £17.82
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    • Order by 3pm for Next Day Delivery
  • 45L Monobloc Valve Double Acting (Spring only) - Approved Hydraulics Limited
    Regular price £17.75
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    45L Monobloc Valve Double Acting (Spring only)

    Key Features

    • Compatibility: 45l monoblock valve series ; hydra part ; hydrocontrol m45 family
    • Function: spring centered double acting spool positioner ; no detent
    • Spool interface: 16 mm spool diameter per 45l valve spec
    • System pressure (valve body ref): up to 315 bar
    • Flow rating (valve body ref): nominal 45 l/min ; max 65 l/min
    • Control options (valve family): manual lever ; cable ; pneumatic ; electro hydraulic
    • Typical applications (valve family): wood splitters ; agricultural loaders ; small cranes
    Regular price £17.75
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    • Order by 3pm for Next Day Delivery
  • Banjo Tubes - Approved Hydraulics Limited
    Regular price From £17.24
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    Banjo Tubes

    Key Features

    • Type: banjo tube
    • Function: compact 90 degree fluid path at joint
    • Use: space constrained hydraulic connections
    • Thread: per selection
    • Material: steel
    Regular price From £17.24
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  • 90L Monobloc Valve High pressure carry over plug 1/2" - Approved Hydraulics Limited
    Regular price £17.00
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    90L Monobloc Valve High pressure carry over plug 1/2"

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 1/2" bsp
    • Compatibility: 90l monoblock valves
    • Use case: cascade 2nd control valve downstream
    • System rating: for systems operating to 315 bar with host valve
    Regular price £17.00
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  • 50L TIE ROD KIT (3 Rods / kit) 8 Bank  M8x1.25 394mm long
    Regular price £16.92
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    50L TIE ROD KIT (3 Rods / kit) 8 Bank M8x1.25 394mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 8 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 394 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 £16.92
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L TIE ROD KIT (4 Rods / kit) 3 Bank M8x1.25  216 mm long
    Regular price £16.85
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    80L TIE ROD KIT (4 Rods / kit) 3 Bank M8x1.25 216 mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 3 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 216 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 80l family
    • Variants: 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 bank options
    Regular price £16.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L TIE ROD KIT (4 Rods / kit) 4 Bank M8x1.25 257 mm long
    Regular price £16.85
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    80L TIE ROD KIT (4 Rods / kit) 4 Bank M8x1.25 257 mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 4 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 257 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 80l family
    • Variants: 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 bank options
    Regular price £16.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 45L Monobloc Valve High Pressure carry over plug  3/8 (G-S) - Approved Hydraulics Limited
    Regular price £16.62
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    45L Monobloc Valve High Pressure carry over plug 3/8 (G-S)

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 3/8" 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 £16.62
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £16.57
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    3/4" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 3/4"
    • Mounting: 4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £16.57
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  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 24 vdc
    • Power: 37 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    12VDC - 36W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 12 vdc
    • Power: 36 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • D/A spool for 50L AK electric op valve - Approved Hydraulics Limited
    Regular price £16.45
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    D/A spool for 50L AK electric op valve

    Key Features

    • Spool type: double acting cylinder spool for AK 50 valve
    • Neutral: spring centered ; P to T open centre ; A.B blocked options by build
    • Work ports: metered control A ; B in both directions
    • Use: operate DA cylinders ; lift ; tilt functions
    • Notes: confirm spool code against valve plate for symbol matching
    Regular price £16.45
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  • 1.5L Plastic Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £16.20
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    1.5L Plastic Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 5 l
    • Neck flange: 120 mm dc
    • Material: plastic
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £16.20
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L lever box with stroke limiter
    Regular price £16.13
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    80L lever box with stroke limiter

    Key Features

    • Feature: mechanical stroke limiter
    • Compatibility: 80 l control valve
    • Use: limit spool travel ; tune flow
    • Application: hydraulic component
    • Application: hydraulic component
    Regular price £16.13
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    • Order by 3pm for Next Day Delivery

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.