• CETOP 3 Manual Override Cap (Screw Type) - Approved Hydraulics Limited
    Regular price £18.42
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    CETOP 3 Manual Override Cap (Screw Type)

    Key Features

    • Type: manual override cap for cetop 3 valve
    • Interface: fits din 24340 ; iso 4401 03 valves
    • Style: screw type override
    • Use: manual operation for setup or emergency
    • Seal: o ring under cap
    • Material: steel or polymer head
    Regular price £18.42
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  • 80L Control Valve Standard Spring Cap Kit
    Regular price £18.20
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    80L Control Valve Standard Spring Cap Kit

    Key Features

    • Series: 80L GS sectional control valve
    • Function: spring return to centre
    • Positioners: fits standard manual lever boxes
    • Typical use: automatic centring of manual spools
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £18.20
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  • 45L Monobloc Valve Single Acting Spring Kit (G)
    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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  • Oil Filter Element - FRD08 - 152mm - 25 µm
    Regular price £18.00
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    Oil Filter Element - FRD08 - 152mm - 25 µm

    Key Features

    • Part number: CCDEP04
    • Element type: Hydraulic oil filter element replacement
    • Filtration rating: 25 µm
    • Dimensions: 70 mm OD; 28 mm ID; 130 mm height
    • Filter media: UFI.CELL filter media
    • Weight: 0.25 kg
    • Cross references: Sofima CRE025CV1; UFI ERA32NCD
    • Typical use: Oil filtration in hydraulic circuits to protect pumps and valves
    Regular price £18.00
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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 100/112 B14 AC motor
    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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  • 45L Monobloc Valve Double Acting (Spring only)
    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
  • Hydraulic Oil ISO 46, 5 Litres - Approved Hydraulics Limited
    Regular price £17.46
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    Hydraulic Oil ISO 46, 5 Litres

    Key Features

    • Viscosity grade: ISO VG 46
    • Type: Mineral anti-wear hydraulic oil ; HLP HM class
    • Performance: Oxidation stability ; anti-foam ; rust protection ; good demulsibility
    • Approvals: Meets DIN 51524-2 HLP ; ISO 11158 HM
    • Use: General purpose mobile and industrial hydraulics
    • Pack size: 5 Litres
    Regular price £17.46
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  • 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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  • 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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  • 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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    • 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
    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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  • 12VDC - 36W- ED 100% Solenoid Only For 45L & 50L Unloader Valve
    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
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  • D/A spool for 50L AK electric op valve
    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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1.5L Plastic Hydraulic Tank 120mm (DC) Neck Flange
    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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  • 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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Oil Filter Element - FRD17 - 93mm - 25µm
    Regular price £16.08
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    Oil Filter Element - FRD17 - 93mm - 25µm

    Key Features

    • Series: FRD17 replacement element
    • Diameter: 93 mm nominal element OD
    • Filtration rating: 25 µm nominal media grade
    • Intended use: particulate removal in hydraulic oil to protect components
    • Applications: return ; suction or low pressure filter housings sized for FRD17 elements
    • Service note: monitor differential pressure and change when indicator shows restriction
    Regular price £16.08
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    • 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 £15.37
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    HP-10C Group 1 Pump Seal Kit

    Key Features

    • Compatibility: Hydra Part HP-10C Group 1 gear pumps
    • Intended use: renew shaft and static seals during Group 1 pump overhaul
    • Typical kit contents: front shaft oil seal ; body o rings ; gasket elements for Group 1 casing
    • Pump family: light duty aluminium gear pumps used widely on compact hydraulics
    • Service note: check for shaft play ; replace bearings if excessive to protect new seal
    • Applications: power packs ; small mobile circuits ; low to mid power implements
    Regular price £15.37
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L TIE ROD KIT (3 Rods / kit) 5 Bank M8x1.25 280mm long
    Regular price £15.36
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    50L TIE ROD KIT (3 Rods / kit) 5 Bank M8x1.25 280mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 5 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 280 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 £15.36
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    • Order by 3pm for Next Day Delivery
  • 50L TIE ROD KIT (3 Rods / kit) 6 Bank M8x1.25 318mm long
    Regular price £15.36
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    50L TIE ROD KIT (3 Rods / kit) 6 Bank M8x1.25 318mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 6 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 318 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 £15.36
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    90L-100L-120L-150L Control Valve Lever Box
    Regular price £15.36
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    90L-100L-120L-150L Control Valve Lever Box

    Key Features

    • Function: manual lever actuator housing for spool control
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Adjustment: stroke limiter versions available
    • Lever interface: m10 threaded lever rod
    • Installation: mounts to spool end in place of other actuators
    Regular price £15.36
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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.