• 90L-120L-100L-150L control valve  (8D2) Dual control spool connector Kit
    Regular price £40.32
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    90L-120L-100L-150L control valve (8D2) Dual control spool connector Kit

    Key Features

    • Function: Dual control spool connector
    • Kit code: 8D2
    • Compatibility: 90L ; 100L ; 120L ; 150L valves
    • Use: Mechanically link two control inputs to one spool
    • Additional info: See product data sheet for detailed measurements
    Regular price £40.32
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  • 80L-90L-100L-120L-150L control valve Pneumatic Kit  Cylinder Only (also 8EP3/4 kits)
    Regular price £97.20
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    80L-90L-100L-120L-150L control valve Pneumatic Kit Cylinder Only (also 8EP3/4 kits)

    Key Features

    • Pressure class: Typically 200-315 bar class
    Regular price £97.20
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  • 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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  • 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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  • 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.

  • 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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  • 8EP4 Air manifold (block only) for electro / pneumatic valve operation (Fits all air cylinders)
    Regular price £4.58
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    8EP4 Air manifold (block only) for electro / pneumatic valve operation (Fits all air cylinders)

    Key Features

    • Function: Pneumatic manifold block for electro ; pneumatic actuation
    • Compatibility: Fits 8EP3/8EP4 air cylinders
    • Use: Remote actuation of hydraulic control valve spools
    • Ports: Multiple pneumatic ports to feed cylinders
    • Additional info: See product data sheet for detailed measurements
    Regular price £4.58
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  • 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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  • 240L Control Valve 1" Left Inlet Section With Direct PRV Type AC (60-315 Bar Max) - Approved Hydraulics Limited
    Regular price £345.41
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    240L Control Valve 1" Left Inlet Section With Direct PRV Type AC (60-315 Bar Max)

    Key Features

    • Valve series: 240 L/min sectional control valve
    • Section: 1" left inlet with direct relief valve ; type AC
    • Relief range: 60 to 315 bar adjustable max
    • Use: Main supply inlet for 240L stacks
    • Compatibility: Hydra Part 240L sectional family
    Regular price £345.41
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  • 240L 1.1/4" Outlet Section Type (RC) - Approved Hydraulics Limited
    Regular price £241.52
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    240L 1.1/4" Outlet Section Type (RC)

    Key Features

    • Valve series: 240 L/min sectional control valve
    • Section type: 1.1/4" outlet section ; code RC
    • Mounting: Bolt-in end or intermediate section in stack
    • Use: High flow return/connection section for large circuits
    • Compatibility: Hydra Part 240L sectional family
    Regular price £241.52
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    Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise

    Key Features

    • Configuration: Group 2 tandem external gear pump
    • Displacement range: Front 4.5 cc/rev up to rear 25 cc/rev options
    • Rotation: Clockwise
    • Shaft ; flange: 1/8 taper ; 4 bolt European flange
    • Ports: BSPP threaded or flanged options by build
    • Max pressure: Up to 250 bar depending on size
    • Use: Dual circuit supply for steering ; work hydraulics
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  • Counter Pressure Pilot Blocks (IT009/IT019) - Approved Hydraulics Limited
    Regular price From £346.49
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    Counter Pressure Pilot Blocks (IT009/IT019)

    Key Features

    • Function: pilot pressure reducing block to feed secondary circuit
    • Flow capacity options: 70 l/min ; 140 l/min
    • Use with: mod10 proportional actuator blocks ; direct to hcd/sd blocks
    • Recommended filtration: 10 micron ; 3-4 l/min pilot flow ; ≤30 bar
    • Connections: 1/2" outlets to distributor ; tank return port
    • Typical applications: scanreco ; remote control ; crane valve pilots
    Regular price From £346.49
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  • 2" BSP Female Swivel Elbow Hose Insert - Approved Hydraulics Limited
    Regular price £94.52
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    2" BSP Female Swivel Elbow Hose Insert

    Key Features

    • Thread: 2" bspp female swivel 60° cone
    • Form: 90° elbow ; hosetail insert for 2" id hose
    • Materials: mild steel ; stainless steel ; polypropylene options
    • Use: braided hose 1-wire ; 2-wire compatible
    • Typical standard: bs 5200 / iso 8434-6 style
    Regular price £94.52
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  • Hydra Part Group 3 Gear Pumps with 1:8 Taper Shaft - Approved Hydraulics
    Regular price From £189.94
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    Group 3 Gear Pumps with 1:8 Taper Shaft

    Key Features

    • Pump group: Group 3 external gear pump
    • Body: Aluminium body with cast iron end plates
    • Shaft: 1/8 taper keyed
    • Flange: 4 bolt European mount
    • Porting: BSPP threaded or flanged depending on build
    • Displacement range: ≈22 to 90 cc/rev options
    • Continuous pressure: Up to ~250 bar ; speeds to ~3000 rpm
    Regular price From £189.94
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  • Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC - Approved Hydraulics Limited

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    Biodegradable Hydraulic Oil ISO46, 1000 Litres IBC

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: ISO46; 1000 Litres IBC

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  • Series 880 Crutch Cylinders

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    Series 880 Crutch Cylinders

    Key Features

    • Application: Heavy duty crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Notes: Designed for higher load support with compact build
    • Use: Stabilisers ; props ; outriggers

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  • Series 800 Crutch Cylinders - Approved Hydraulics Limited

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    Series 800 Crutch Cylinders

    Key Features

    • Application: Crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Construction: Welded steel ; chrome plated rod
    • Use: Stabilisers ; props on mobile plant

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  • Series 640 Top Link Cylinders - Approved Hydraulics Limited

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    Series 640 Top Link Cylinders

    Key Features

    • Use: Heavy duty top link variant
    • Mounting: Hitch compatible ; ball ends
    • Rated pressure: 200-250 bar class
    • Supply: Complete with hoses
    • Applications: Demanding agricultural implements

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  • Series 600 Top Link Cylinders - Approved Hydraulics Limited

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    Series 600 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link family for tractors
    • Bore ; rod options: ≈60/35 ; 80/40 ; 100/45 mm depending on model
    • Pressure: 200 bar typical ; 250 bar max
    • Supply: Often supplied complete with hoses
    • Function: Remote implement angle control on 3 point hitch

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  • Series 590 Turn Over Plough Cylinders - Approved Hydraulics Limited

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    Series 590 Turn Over Plough Cylinders

    Key Features

    • Application: Turn-over ; reversible plough actuation
    • Action: Double acting
    • Holding: Typically supplied with pilot operated check for safe position holding
    • Working pressure: Up to 250 bar
    • Temperature range: -25 °C to +80 °C
    • Duty: Agricultural implement rotation ; alignment

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  • Series 500 Front Flange Cylinders

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    Series 500 Front Flange Cylinders

    Key Features

    • Mounting: Front flange welded cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Speed: Up to 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Applications: Mobile ; industrial where flange mount is required

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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise - Approved Hydraulics Limited

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    Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise

    Key Features

    • Configuration: Group 2 tandem external gear pump
    • Displacement range: Front 4.5 cc/rev up to rear 25 cc/rev options
    • Rotation: Clockwise
    • Shaft ; flange: 1/8 taper ; 4 bolt European flange
    • Ports: BSPP threaded or flanged options by build
    • Max pressure: Up to 250 bar depending on size
    • Use: Dual circuit supply for steering ; work hydraulics

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    • 1 Year Limited Manufacturers Warranty
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  • Series 400 Double Acting Cylinders - Approved Hydraulics Limited

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    Series 400 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder ; heavy duty
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Construction: Welded steel body ; chrome rod ; honed tube
    • Applications: Mobile equipment ; agricultural ; industrial actuators

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  • Series 300 Double Acting Cylinders - Approved Hydraulics Limited

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    Series 300 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Rod material: C45 hard chrome plated
    • Tube: ST52.3 DIN 2393 honed ; ISO H9 tolerance
    • Fluid: Mineral hydraulic oil

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  • Series 100 Single Acting Cylinders - Approved Hydraulics Limited

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    Series 100 Single Acting Cylinders

    Key Features

    • Type: Single acting hydraulic cylinder
    • Max working pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Fluid: Mineral oil to ISO 11158 HM ; HLP
    • Applications: Simple lift ; tilt ; clamp duties on mobile equipment

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Shop All Components for Professional Hydraulic Applications

Discover quality shop all components 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 control valves, line mounted valves 1, hydraulic cylinders, hydraulic pumps 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.