• 45L Monobloc Valve 2 Axis Mechanical Joystick Kit (LCB) - Approved Hydraulics Limited
    Regular price £55.18
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    45L Monobloc Valve 2 Axis Mechanical Joystick Kit (LCB)

    Key Features

    • Type: 2 axis mechanical joystick . lcb layout
    • Compatibility: Hydra Part 45L monobloc valve series
    • Function: controls two spools with cross pattern motion
    • Use: loaders ; cranes ; attachments
    • Integration: mechanical linkages and brackets included
    Regular price £55.18
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  • 45L Monobloc Valve Direct Acting Electric Solenoid Double Acting Spool  (1 8ES) (G)
    Regular price £25.33
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    45L Monobloc Valve Direct Acting Electric Solenoid Double Acting Spool (1 8ES) (G)

    Key Features

    • Spool type: double acting 1 es for direct electric solenoid operation
    • Actuation: direct acting electric solenoid (8es) operator
    • Application: cylinder control with electric actuation
    • Compatibility: 45l monobloc valve series
    • Positions: 3 position ; spring return to neutral
    Regular price £25.33
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  • 45L Monobloc Valve Direct Acting Electric Solenoid Motor Spool  (2 8ES) (G)
    Regular price £25.33
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    45L Monobloc Valve Direct Acting Electric Solenoid Motor Spool (2 8ES) (G)

    Key Features

    • Spool type: motor spool 2 es for direct electric solenoid operation
    • Actuation: direct acting electric solenoid (8es) operator
    • Application: bidirectional motors with electric control
    • Compatibility: 45l monobloc valve series
    • Positions: 3 position ; spring return to neutral
    Regular price £25.33
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  • 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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  • 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.

  • 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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  • 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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  • 45L Monobloc Valve End Cap Cover Only For Spring (G) - Approved Hydraulics Limited
    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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  • 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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  • 45L Monobloc Valve High pressure carry over plug 1/2" (G-S)
    Regular price £12.55
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    45L Monobloc Valve High pressure carry over plug 1/2" (G-S)

    Key Features

    • Function: high pressure carry over ; power beyond
    • Thread: 1/2" 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 £12.55
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  • 45L Monobloc Valve Motor Spool Type 2 (G) - Approved Hydraulics Limited
    Regular price £22.14
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    45L Monobloc Valve Motor Spool Type 2 (G)

    Key Features

    • Spool type: motor spool type 2
    • Application: bi directional hydraulic motors
    • Behavior: neutral geometry reduces load shock and cavitation
    • Compatibility: 45l monobloc valve series
    • Positions: 3 position ; spring return to neutral
    Regular price £22.14
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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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  • 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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  • 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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  • 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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    • Order by 3pm for Next Day Delivery
  • 45L Monoblock Valve S/Acting A Spool -Blank B port (Spool Only - Requires B/Plug, Spring and DOW) (G)
    Regular price £25.20
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    45L Monoblock Valve S/Acting A Spool -Blank B port (Spool Only - Requires B/Plug, Spring and DOW) (G)

    Key Features

    • Spool type: single acting type 3 ; a port active ; b 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 £25.20
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    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L-50L Control Valve 3 Position Detent Kit (G) - Approved Hydraulics Limited
    Regular price £34.97
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    45L-50L Control Valve 3 Position Detent Kit (G)

    Key Features

    • Part number: 30075303
    • Compatibility: 45L; 50L control valve family
    • Detent type: 3 position detent kit; type G
    • Function: Locks spool in 3 working positions without holding the lever
    • Typical use: Continuous functions such as motors or extended actuator cycles
    • Installation: Retrofit kit for valve spool end cap assembly
    Regular price £34.97
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  • 45L-50L Control Valve Pneumatic Kit (8P) (G) - Approved Hydraulics Limited
    Regular price £40.50
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    45L-50L Control Valve Pneumatic Kit (8P) (G)

    Key Features

    • Actuation: pneumatic cylinder kit for remote spool operation
    • Compatibility: 45l ; 50l control valves
    • Use case: enables air control from cab or panel
    • Integration: works with 3/2 electro pneumatic valves in 8ep3 ; 8ep4 systems
    • Benefit: isolates operator from hydraulic leaks ; improves ergonomics
    Regular price £40.50
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  • 45L-50L Control Valve Spool Seal Retaining Washer
    Regular price £5.15
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    45L-50L Control Valve Spool Seal Retaining Washer

    Key Features

    • Part: spool seal retaining washer
    • Compatibility: 45l ; 50l control valves
    • Function: retains u seal ; prevents seal extrusion
    • Use: service maintenance of spool seal stack
    • Material: hardened steel washer
    Regular price £5.15
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  • 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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  • 4L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £35.33
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    4L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 4 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £35.33
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  • On Sale
    Hydra Part Standard 90L Lever Operated Monoblock Valves (3/4"BSP) - Approved Hydraulics
    Regular price £331.27
    Regular price £391.97 Sale price Saving 15%
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    5 Bank - Standard 90L Lever Operated Monoblock Valves (3/4"BSP)

    Key Features

    • Ports: 3/4\" bsp p ; a ; b ; t
    • Nominal flow: 90 lpm ; 100 lpm max
    • Max operating pressure: 315 bar
    • Spools: double acting ; spring return to neutral
    • Carry over: hp carry over port optional
    • Banks: 1 to 6 levers
    • Options: cable ; joystick ; pneumatic ; electro-hydraulic kits
    Regular price £331.27
    Regular price £391.97 Sale price Saving 15%
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    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Coned Blanking Plug - Approved Hydraulics Limited
    Regular price £2.80
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    5/8" BSP Coned Blanking Plug

    Key Features

    • Type: 60° coned seat blanking plug
    • Thread: 5/8 BSP
    • Seal: metal-to-metal on 60° cone
    • Material: plated steel for high pressure service
    • Use: safe isolation of unused ports
    Regular price £2.80
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  • 1/4" BSP Male for Bonded Seal x 1/4" BSP Female Swivel 90° Compact Elbow - Approved Hydraulics Limited
    Regular price £27.95
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    5/8" BSP Male for Bonded Seal x 5/8" BSP Female Swivel 90° Compact Elbow

    Key Features

    • Type: 90° elbow adaptor (male to male)
    • Threads: 5/8 to 5/8 BSP
    • Body: compact body for routing clearance
    • Construction: forged carbon steel; zinc plated
    • Use: change hose direction while maintaining service access
    Regular price £27.95
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  • 1/2" BSP Male x 1 1/4" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £13.40
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    5/8" BSP Male x 1" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 5/8 to 1 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £13.40
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All for Professional Hydraulic Applications

Discover quality all 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. Whether you are replacing existing parts or specifying components for a new build, our experienced team can help you find the right product. 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.