• Motor Spool For 50L AK Electric / Lever Operated Valve
    Regular price £15.25
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    Motor Spool For 50L AK Electric / Lever Operated Valve

    Key Features

    • Spool function: motor spool geometry with A ; B open to tank in neutral for freewheeling
    • Valve family: fits 50 LPM AK electric or lever operated sectional valve body
    • Purpose: minimise cavitation risk and allow smooth motor rundown at neutral
    • Use case: hydraulic motors on conveyors ; augers ; winches
    • Service note: check section seals and end caps during spool replacement
    • Selection: confirm 50L AK body type before ordering
    Regular price £15.25
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    • Order by 3pm for Next Day Delivery
  • 80L TIE ROD KIT (4 Rods / kit) 2 bank M8x1.25 175 mm long
    Regular price £15.19
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    80L TIE ROD KIT (4 Rods / kit) 2 bank M8x1.25 175 mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 2 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 175 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 £15.19
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    • Order by 3pm for Next Day Delivery
  • 80L TIE ROD KIT (4 Rods / kit) 1 Bank   M8x1.25 134mm long
    Regular price £15.19
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    80L TIE ROD KIT (4 Rods / kit) 1 Bank M8x1.25 134mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 1 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 134 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 £15.19
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    • Order by 3pm for Next Day Delivery
  • Motor side Coupling For Mounting kit for frame 90 B14 AC motor
    Regular price £15.19
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    Motor side Coupling For Mounting kit for frame 90 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 90
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £15.19
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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.

  • Single Acting Spool On 'A' Port for AK50 Control Valve
    Regular price £15.19
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    Single Acting Spool On 'A' Port for AK50 Control Valve

    Key Features

    • Spool type: single acting on A port with check on B
    • Neutral: spring centered ; blocked work port in neutral
    • Function: metered raise on A ; gravity return via check
    • Application: SA cylinders ; tipper ; clamps
    • Specification: see product datasheet
    Regular price £15.19
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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
    Regular price £15.11
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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 £15.11
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    • Order by 3pm for Next Day Delivery
  • 45L Monobloc Valve High Pressure carry over plug  3/8 (G-S) - Approved Hydraulics Limited
    Regular price £15.11
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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 £15.11
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    • Order by 3pm for Next Day Delivery
  • 50L TIE ROD KIT (3 Rods / kit) 4 Bank  M8x1.25 242mm long
    Regular price £15.06
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    50L TIE ROD KIT (3 Rods / kit) 4 Bank M8x1.25 242mm long

    Key Features

    • Valve family: 50l sectional valve
    • Configuration: 4 bank
    • Rods per kit: 3
    • Thread: m8x1.25
    • Rod length: 242 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 £15.06
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Tie Rod Kit - 3 Bank (3 Rods / kit) M8 x1.25 x 204mm long
    Regular price £15.06
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    50L Control Valve Tie Rod Kit - 3 Bank (3 Rods / kit) M8 x1.25 x 204mm long

    Key Features

    • Series: 50L GS sectional control valve
    • Bank size: 3 bank
    • Length: 204 mm
    • Thread: M8x1.25
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £15.06
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    • Order by 3pm for Next Day Delivery
  • Microswitch (Normally Open x M14 x 1.5 thread)
    Regular price £14.65
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    Microswitch (Normally Open x M14 x 1.5 thread)

    Key Features

    • Type: microswitch ; normally open
    • Thread: m14 x 1.5
    • Use: lever position sensing ; electrical signalling on control valves
    • Mounting: screws into dedicated boss on lever box/actuator kit
    • Contact rating: suits low current control circuits ; use relay for higher loads
    Regular price £14.65
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" Hose Burst Valve in a Female - Female Housing
    Regular price £14.44
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    3/8" Hose Burst Valve in a Female - Female Housing

    Key Features

    • Ports: G 3/8 BSPP female x female
    • Function: flow operated hose burst safety shut off
    • Max flow: 50 l.min typical
    • Max pressure: 350 bar
    • Body: zinc plated steel ; low leakage design
    • Options: orifice in disc for emergency lowering on request
    • Mounting: install at cylinder port ; use downstream flow regulator to control lowering
    Regular price £14.44
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  -24VDC Coil (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £14.41
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    CETOP 3 Coil -24VDC Coil (23mm Bore x 50mm long)

    Key Features

    • Voltage: 24 vdc
    • Bore: 23 mm
    • Length: 50 mm
    • Connection: din 43650 a
    • Use: cetop 3 solenoid valves
    Regular price £14.41
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  • CETOP 3  Spacer 30mm Thick For 500050-2 (AC) Manifold
    Regular price £14.37
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    CETOP 3 Spacer 30mm Thick For 500050-2 (AC) Manifold

    Key Features

    • Category: hydraulic power pack component
    • Use: mobile ; industrial hydraulic circuits
    • Interfaces: bsp threads ; cetop ; b14 per model
    • Notes: see product page for detailed model specific data
    • Status: placeholder; requires deeper model data
    Regular price £14.37
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    • Order by 3pm for Next Day Delivery
  • CETOP 3  Spacer 23mm Thick For 500208 (DC) Manifold 500208 - Approved Hydraulics Limited
    Regular price £14.37
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    CETOP 3 Spacer 23mm Thick For 500208 (DC) Manifold 500208

    Key Features

    • Category: hydraulic power pack component
    • Use: mobile ; industrial hydraulic circuits
    • Interfaces: bsp threads ; cetop ; b14 per model
    • Notes: see product page for detailed model specific data
    • Status: placeholder; requires deeper model data
    Regular price £14.37
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90L - 120L - 150L Control Valve Lever Box With Stroke Limiter
    Regular price £14.35
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    • Delivery to UK & Ireland

    90L - 120L - 150L Control Valve Lever Box With Stroke Limiter

    Key Features

    • Function: Lever box with built in stroke limiter
    • Compatibility: 90L ; 120L ; 150L valves
    • Use: Precisely limit spool movement from lever
    • Additional info: See product data sheet for detailed measurements
    • Adjustment method: External set screws with lock collars
    Regular price £14.35
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Rotary shaft seal
    Regular price £14.24
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    • Delivery to UK & Ireland

    Rotary shaft seal

    Key Features

    • Type: rotary shaft oil seal
    • Profile: R23 style (double lip with dust lip)
    • Material: oil-resistant elastomer with garter spring
    • Use: seals cone splitter spindle against oil leakage
    • Service: replace when leakage or lip wear is observed
    Regular price £14.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Standard Lever Box (Excluding Lever)
    Regular price £13.80
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    80L Control Valve Standard Lever Box (Excluding Lever)

    Key Features

    • Series: 80L GS sectional control valve
    • Actuator: manual lever box
    • Interface: lever M10 thread input
    • Use: mechanical actuation of spool
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £13.80
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Aluminum Flange For Mounting kit for frame 80 B14 AC motor
    Regular price £13.54
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    Aluminum Flange For Mounting kit for frame 80 B14 AC motor

    Key Features

    • Material: aluminum
    • Interface: iec b14 motor flange
    • Frame size: 80
    • Use: mount ac motor to central manifold ; pump
    • Compatibility: group 1 pump ; matching semi couplings
    Regular price £13.54
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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
    Regular price £13.26
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    • Delivery to UK & Ireland

    12V Elec/Air Solenoid coil for 8EP3 -4 kit 3W IP65 100% ED - Coil 9mm hole x 30mm long

    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 £13.26
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3 Position Detent Kits Type SC4 For AK50 Control Valve
    Regular price £13.14
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    3 Position Detent Kits Type SC4 For AK50 Control Valve

    Key Features

    • Part number: 2000363000
    • Compatibility: AK50 control valve
    • Detent type: SC4 detent mechanism
    • Positions: 3 position detent
    • Function: Holds spool in selected position for continuous operation
    • Typical use: Directional control where lever must stay engaged
    Regular price £13.14
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil – 220VAC-50HZ  (23mm Bore x 50mm long)
    Regular price £13.13
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    • Delivery to UK & Ireland

    CETOP 3 Coil – 220VAC-50HZ (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with correct DIN plug
    • Notes: ensure AC coil ; armature pairing per manufacturer
    Regular price £13.13
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    • Delivery to UK & Ireland

    CETOP 3 Coil - 12VDC, (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 12 VDC
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A or AMP Jr versions depending on brand
    • Protection: IP65 with suitable connector
    • Power class: typically ~20–29 W DC coils for NG6
    Regular price £13.13
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors
    Regular price £13.07
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    3/4" Port, Straight, 51mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: straight
    • Port: 3/4"
    • Mounting: 3/4 hole on 51 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £13.07
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90L - 100L - 120L -150L Control Valve  End Cap With Stroke Limiter
    Regular price £13.04
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    90L - 100L - 120L -150L Control Valve End Cap With Stroke Limiter

    Key Features

    • Function: End cap with adjustable stroke limiter
    • Compatibility: 90L ; 100L ; 120L ; 150L valves
    • Use: Limit spool travel ; control flow or cylinder stroke
    • Additional info: See product data sheet for detailed measurements
    • Adjustment method: Threaded limiter screws with lock nuts
    Regular price £13.04
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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.