• 80L Control valve Detent Kit In All 3 Positions
    Regular price £31.36
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    80L Control valve Detent Kit In All 3 Positions

    Key Features

    • Series: 80L GS sectional control valve
    • Applications: mobile hydraulics ; loaders ; cranes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    • Fluid: mineral oil ; 15–75 cSt operating range
    • Max pressure class: up to 315 bar per series
    Regular price £31.36
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  • 90L - 100L - 120 - 150L Control Valve End Cap
    Regular price £4.00
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    90L - 100L - 120 - 150L Control Valve End Cap

    Key Features

    • Function: end cap for spool section ; closes body and retains hardware
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Options: with stroke limiter ; without stroke limiter
    • Maintenance: allows access to spring or detent kits
    • Typical use: service replacement to restore manual lever feel
    Regular price £4.00
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  • 80L-90L-100L-120L-150L control valve Detent Kit (9B)  Detent In A Position
    Regular price £43.92
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    80L-90L-100L-120L-150L control valve Detent Kit (9B) Detent In A Position

    Key Features

    • Function: Detent in A position ; positions 0 and B spring centered
    • Kit code: 9B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full A
    • Additional info: See product data sheet for detailed measurements
    Regular price £43.92
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  • 80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position
    Regular price £37.86
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    80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position

    Key Features

    • Function: Detent in B position ; positions 0 and A spring centered
    • Kit code: 10B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full B
    • Additional info: See product data sheet for detailed measurements
    Regular price £37.86
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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.

  • 90L-100L-120L-150L Control valve  3 Position Detent Kit (11)
    Regular price £39.60
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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 £39.60
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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
  • 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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    • Order by 3pm for Next Day Delivery
  • 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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    • Order by 3pm for Next Day Delivery
  • 160L-240L Control Valve 3 Position Detent Kit (11)
    Regular price £77.65
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    160L-240L Control Valve 3 Position Detent Kit (11)

    Key Features

    • Type: 3 position detent kit . code 11
    • Compatibility: 160l ; 240l control valves
    • Function: locks spool in a ; neutral ; b positions
    • Use: sustained operation without holding the lever
    • Install: spring cap side positioner hardware
    Regular price £77.65
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    • Order by 3pm for Next Day Delivery
  • 45L - 50L Control Valve End Cap With Adjustable Stroke Limiter (G-S)
    Regular price £34.66
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    45L - 50L Control Valve End Cap With Adjustable Stroke Limiter (G-S)

    Key Features

    • Function: end cap with built in stroke limiter
    • Compatibility: 45l ; 50l control valves
    • Adjustment: mechanical stops to limit spool throw
    • Use: fine tune flow rate or speed of actuator
    • Install: replaces standard end cap
    Regular price £34.66
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    • Order by 3pm for Next Day Delivery
  • 45L & 50L Control Valve 4 Position Detent in posn 3) for spool 5DY Float Spool (G)
    Regular price £28.75
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    45L & 50L Control Valve 4 Position Detent in posn 3) for spool 5DY Float Spool (G)

    Key Features

    • Type: 4 position detent for 5dy float spool
    • Positions: neutral ; a ; float pos 3 ; b
    • Function: adds float detent in position 3
    • Compatibility: 45l ; 50l control valves
    • Use: loader lift ; blade float applications
    Regular price £28.75
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    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L Monobloc Valve Single acting detent kit in Pos. 2 for spools 3 + 4 10BT
    Regular price £35.48
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    45L Monobloc Valve Single acting detent kit in Pos. 2 for spools 3 + 4 10BT

    Key Features

    • Type: 10bt detent kit for single acting spools
    • Positions: holds in position 2
    • Compatibility: spools type 3 ; type 4 on 45l monobloc
    • Use: maintains flow without manual lever force
    • Install: fits spring cap side
    Regular price £35.48
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    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L Monobloc valve Single acting detent kit in Pos. 1 for spools 3 + 4  9BT
    Regular price £25.28
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    45L Monobloc valve Single acting detent kit in Pos. 1 for spools 3 + 4 9BT

    Key Features

    • Type: 9bt detent kit for single acting spools
    • Positions: holds in position 1
    • Compatibility: spools type 3 ; type 4 on 45l monobloc
    • Use: maintains flow without manual lever force
    • Install: fits spring cap side
    Regular price £25.28
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    • Order by 3pm for Next Day Delivery
  • 45L - 50L Control Valve Detent Kit (9B)  Detent in 'A' Position (G)
    Regular price £25.28
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    45L - 50L Control Valve Detent Kit (9B) Detent in 'A' Position (G)

    Key Features

    • Type: detent kit 9b . locks spool in 'a' position
    • Compatibility: 45l ; 50l control valves
    • Use: hold function engaged without manual force
    • System: lever operated monoblock positioner accessory
    • Service: field installable kit
    Regular price £25.28
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    • Order by 3pm for Next Day Delivery
  • 45L - 50L Control Valve Microswitch Kit (Request NO or NC as needed) (G-S)
    Regular price £52.75
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    45L - 50L Control Valve Microswitch Kit (Request NO or NC as needed) (G-S)

    Key Features

    • Function: single microswitch kit for spool position sensing
    • Compatibility: 45l ; 50l control valves
    • Switch types: normally open ; normally closed options
    • Use: auxiliary electrical signal for interlocks or lights
    • Mounting: fits spring cap positioner hardware
    Regular price £52.75
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    • Order by 3pm for Next Day Delivery
  • 45L Monobloc Valve End Cap Cover Only For Spring (G)
    Regular price £2.40
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    45L Monobloc Valve End Cap Cover Only For Spring (G)

    Key Features

    • Function: protective end cap cover for spring cavity
    • Compatibility: 45l monobloc valve series
    • Use: service replacement when lever box is removed
    • Position: mounts on spool end cap side
    • Note: cover only ; spring kit supplied separately
    Regular price £2.40
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    • Order by 3pm for Next Day Delivery
  • 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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    • Order by 3pm for Next Day Delivery
  • 90L - 120L -100L - 120L -150L Control Valve End cap spring kit.
    Regular price £22.18
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    90L - 120L -100L - 120L -150L Control Valve End cap spring kit.

    Key Features

    • Purpose: spring return kit for lever operated spools
    • Compatibility: 90l ; 100l ; 120l ; 150l valve families
    • Function: restores neutral centering force on spool
    • Typical maintenance: used when lever fails to return to center
    • Installation: fits behind end cap on spool end
    Regular price £22.18
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    • 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
  • 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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    • Order by 3pm for Next Day Delivery
  • 90L  Monobloc valve single Acting Detent (B Blanked)
    Regular price £38.62
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    90L Monobloc valve single Acting Detent (B Blanked)

    Key Features

    • Valve: 90L monoblock ; single acting conversion
    • Spool: B side blanked ; spring return kit fitted
    • Use: Single acting service with return to tank via open port
    • Detent: Maintains actuation in required direction
    • Additional info: See product data sheet for detailed measurements
    Regular price £38.62
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    • Order by 3pm for Next Day Delivery
  • 90L Monobloc valve single Acting Detent  (A Blanked)
    Regular price £38.63
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    90L Monobloc valve single Acting Detent (A Blanked)

    Key Features

    • Valve platform: 90 l/min monoblock directional valve
    • Spool function: single-acting; a-port blanked
    • Detent: mechanical detent on return stroke
    • Port threads: typically 1/2" bsp p;t;a;b
    • Use: operate single-acting cylinders e.g. tipping
    • Accessories: spring/detent kit 30075376 family
    Regular price £38.63
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  • 90LS & 90L Single Microswitch Kit  (Req's switch N/O 30075320 or N/C 20010687 extra as needed - Not included)
    Regular price £42.58
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    90LS & 90L Single Microswitch Kit (Req's switch N/O 30075320 or N/C 20010687 extra as needed - Not included)

    Key Features

    • Function: Single microswitch to detect spool actuation
    • Compatibility: 90L ; 90LS control valves
    • Contacts: N/O or N/C switch options required separately
    • Use: Electrical signal for interlocks ; indicators
    • Additional info: See product data sheet for detailed measurements
    Regular price £42.58
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    • Order by 3pm for Next Day Delivery

Spool Positioners

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.