• 80L Control Standard Spring Cap (Only) With Stroke Limiter
    Regular price £24.95
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    80L Control Standard Spring Cap (Only) With Stroke Limiter

    Key Features

    • Series: 80L GS sectional control valve
    • Function: spring return to centre
    • Adjustment: integral stroke limiter
    • Positioners: fits standard manual lever boxes
    • Typical use: automatic centring of manual spools
    Regular price £24.95
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  • 7L Plastic Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £24.87
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    7L Plastic Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 7 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 £24.87
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  • 12vDC Coil For Z50 valve 16.3mm Hole x 50mm Long - Approved Hydraulics Limited
    Regular price £24.72
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    12vDC Coil For Z50 valve 16.3mm Hole x 50mm Long

    Key Features

    • Voltage: 12 vdc
    • Bore: 16.3 mm through-hole
    • Body length: 50 mm
    • Duty: 100% ed continuous
    • Connection: din plug style
    • Use: z50 solenoid valves
    Regular price £24.72
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  • 24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long
    Regular price £24.68
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    24VDC Coil For Z50 valve 16.3mm Hole x 50mm Long

    Key Features

    • Voltage: 24 vdc
    • Bore: 16.3 mm
    • Length: 50 mm
    • Use: z50 sectional valve coil
    • Connector: din plug
    Regular price £24.68
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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.

  • 100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit)  M10x1.5 x 328mm long
    Regular price £24.58
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    100L Control Valve Tie Rod Kit - 5 Bank (4 Rods / kit) M10x1.5 x 328mm long

    Key Features

    • Kit: tie rods for 5 bank assembly . 4 rods per kit
    • Thread: m10x1.5
    • Rod length: 328 mm
    • Compatibility: 100l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £24.58
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  • 100L Control Valve Tie Rod Kit - 6 Bank (4 Rods / kit) M10x1.5 373mm long
    Regular price £24.58
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    100L Control Valve Tie Rod Kit - 6 Bank (4 Rods / kit) M10x1.5 373mm long

    Key Features

    • Kit: tie rods for 6 bank assembly . 4 rods per kit
    • Thread: m10x1.5
    • Rod length: 373 mm
    • Compatibility: 100l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £24.58
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  • 45L Monobloc Valve S/Acting B Spool -Blank A port  (Reqs 30075301 spring kit)
    Regular price £24.53
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    45L Monobloc Valve S/Acting B Spool -Blank A port (Reqs 30075301 spring kit)

    Key Features

    • Spool type: single acting type 4 ; b port active ; a port plugged
    • Positions: 3 position ; spring return to neutral
    • Use: single acting cylinders
    • Compatibility: 45l monobloc valve series
    • Note: requires single acting spring kit 30075301
    Regular price £24.53
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    • Order by 3pm for Next Day Delivery
  • 12V DC Coil-22W-13mm hole-39mm long for  45 - 50L - 80L-90L-100L-150L Unloader Valve - Approved Hydraulics Limited
    Regular price £24.48
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    • Delivery to UK & Ireland

    12V DC Coil-22W-13mm hole-39mm long for 45 - 50L - 80L-90L-100L-150L Unloader Valve

    Key Features

    • Voltage: 12 vdc
    • Power: 22 w
    • Bore: 13 mm through-hole
    • Body length: 39 mm
    • Duty: 100% ed
    • Use: unloader valve actuation
    Regular price £24.48
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  • 150L Control Valve Tie Rod Kit - 4 Bank (4 Rods / kit) M10x1.5 x 318mm long
    Regular price £24.36
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    150L Control Valve Tie Rod Kit - 4 Bank (4 Rods / kit) M10x1.5 x 318mm long

    Key Features

    • Series: 150L GS sectional control valve
    • Bank size: 4 bank
    • Length: 318 mm
    • Thread: M10x1.5
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £24.36
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    • Order by 3pm for Next Day Delivery
  • Filler Breather for Hydraulics Oil Tanks - Approved Hydraulics Limited
    Regular price £24.25
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    Filler Breather for Hydraulics Oil Tanks

    Key Features

    • Type: Filler breather assembly for hydraulic reservoirs
    • Filtration options: 3 µm ; 10 µm ; 40 µm elements
    • Mounting: Threaded ; bayonet ; or 3-hole flange variants
    • Strainer: Optional tank neck strainer ; coarse mesh
    • Materials: Metal cap with polymer or alloy body ; nitrile seal
    • Use: Vent ; fill point and contamination control for hydraulic tanks
    Regular price £24.25
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  • 45L Monobloc Valve Double Acting Spool Type 1CS (Proportional - sensative) (G) - Approved Hydraulics Limited
    Regular price £24.24
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    45L Monobloc Valve Double Acting Spool Type 1CS (Proportional - sensative) (G)

    Key Features

    • Spool type: double acting type 1cs . proportional . sensitive response
    • Positions: 3 position ; spring return to neutral
    • Use: precise manual lever control of cylinders
    • Compatibility: 45l monobloc valve series
    • Benefit: finer metering at low lever angle
    Regular price £24.24
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  • 100L Control Valve Double Acting Spool (Type 1) - Approved Hydraulics Limited
    Regular price £24.19
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    100L Control Valve Double Acting Spool (Type 1)

    Key Features

    • Spool type: double acting type 1
    • Positions: 3 position ; spring return to neutral
    • Neutral: a and b closed in neutral
    • Use: bi directional cylinders
    • Compatibility: 100l valve family
    Regular price £24.19
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  • 150L Control Valve Tie Rod Kit - 3 Bank (4 Rods / kit)   M10x1.5  270mm long - Approved Hydraulics Limited
    Regular price £24.19
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    150L Control Valve Tie Rod Kit - 3 Bank (4 Rods / kit) M10x1.5 270mm long

    Key Features

    • Series: 150L GS sectional control valve
    • Bank size: 3 bank
    • Length: 270 mm
    • Thread: M10x1.5
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £24.19
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    • Order by 3pm for Next Day Delivery
  • Out of Stock
    3/4" BSP Return Filter Housing
    Regular price £24.18
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    3/4" BSP Return Filter Housing

    Key Features

    • Port: 3/4" bspp return
    • Function: return filter head/housing
    • Use: tank top filtration assembly
    • Element: 25 µm compatible
    • Application: hydraulic system component
    Regular price £24.18
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    • Order by 3pm for Next Day Delivery
  • 90L-100L-120L-150L Control valve  3 Position Detent Kit (11) - Approved Hydraulics Limited
    Regular price £24.08
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    90L-100L-120L-150L Control valve 3 Position Detent Kit (11)

    Key Features

    • Function: 3 position detent ; holds spool in forward and reverse
    • Compatibility: 90L ; 100L ; 120L ; 150L control valves
    • Use: Motor circuits needing maintained actuation or float
    • Install: Replaces end cap hardware on selected spool
    • Additional info: See product data sheet for detailed measurements
    Regular price £24.08
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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 £23.96
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    Cylinder Seal kit 20-32/40 series 200/300/400/500

    Key Features

    • Compatibility: Hydra Part cylinder series 200 ; 300 ; 400 ; 500
    • Bore sizes: 20 ; 25 ; 30/32 ; 40 mm
    • Intended use: reseal kit for small bore standard cylinders used on compact equipment
    • Typical kit contents: piston ; rod ; wiper seals and static rings typically supplied for rebuild
    • Applications: small actuators on trailers ; clamps ; light duty machinery
    • Selection note: use bore size and series number to choose correct kit option
    Regular price £23.96
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 120L Double Acting Spool
    Regular price £23.94
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    120L Double Acting Spool

    Key Features

    • Spool: double acting ; 3 positions
    • Series: 120 l monoblock valve
    • Neutral: A ; B blocked in neutral
    • Use: cylinder control
    • Application: hydraulic component
    Regular price £23.94
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    90L Monobloc Valve S/Acting B Spool -Blank A port & fit spring kit 30075376
    Regular price £23.94
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    90L Monobloc Valve S/Acting B Spool -Blank A port & fit spring kit 30075376

    Key Features

    • Valve family: 90 l/min monoblock control valve
    • Spool type: single-acting conversion via spring kit
    • Kit reference: 30075376 detent/spring parts
    • Compatibility: type 3 ; type 4 spools in 90l series
    • Ports: typically 1/2" bsp on 90 l/min valves
    • Use: blank one work port to create single-acting function
    Regular price £23.94
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90L Monobloc Valve Double Acting Spool
    Regular price £23.94
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    • Delivery to UK & Ireland

    90L Monobloc Valve Double Acting Spool

    Key Features

    • Compatibility: 90l gm10 monoblock valves ; walvoil sd11 interchangeable
    • Spool function: double acting ; 3 positions ; spring return to neutral
    • Nominal flow rating: 90 l/min ; max 100 l/min
    • Max operating pressure: 315 bar
    • Ports: 1/2" bsp ; 3/4" bsp options
    • Power beyond: high pressure carry over port available
    • Intended use: cylinder control on mobile equipment
    Regular price £23.94
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90L Monobloc Valve  Single acting spring kit for type 3 & 4 spools
    Regular price £23.94
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    90L Monobloc Valve Single acting spring kit for type 3 & 4 spools

    Key Features

    • Purpose: convert spool to single acting operation
    • Compatibility: 90l monoblock ; spool types 3 ; 4
    • Operation: blanks one work port ; spring return to neutral
    • Application: single acting cylinders ; tipper bodies ; clamps
    • Includes: return spring and end hardware
    Regular price £23.94
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Z80 Single Acting Spool - Approved Hydraulics Limited

    POA

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    • Delivery to UK & Ireland

    Z80 Single Acting Spool

    Key Features

    • Type: z80 single acting spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Z80 Motor Spool - Approved Hydraulics Limited

    POA

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    • Delivery to UK & Ireland

    Z80 Motor Spool

    Key Features

    • Type: z80 motor spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Out of Stock
    80L TIE ROD KIT (4 Rods / kit) 9 Bank M8x1.25 469mm long
    Regular price £23.57
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    80L TIE ROD KIT (4 Rods / kit) 9 Bank M8x1.25 469mm long

    Key Features

    • Valve size: 80l
    • Banks: 9 bank
    • Rod thread: 8x1.25
    • Rod length: 469 mm
    • Set: 4 tie rods per kit
    • Use: assemble sectional valve stack
    Regular price £23.57
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    • Order by 3pm for Next Day Delivery
  • 80L TIE ROD KIT (4 Rods / kit) 10 Bank M8x1.25 508mm long
    Regular price £23.57
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    80L TIE ROD KIT (4 Rods / kit) 10 Bank M8x1.25 508mm long

    Key Features

    • Valve family: 80l sectional valve
    • Configuration: 10 bank
    • Rods per kit: 4
    • Thread: m8x1.25
    • Rod length: 508 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 £23.57
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    • Delivery to UK & Ireland
    • 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.