• SAE10/2 Solenoid Valve Cartridge - Pilot Operated - 70 L/Min - 350bar - Checked in BOTH Directions - Approved Hydraulics Limited
    Regular price From £67.37
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    SAE8/2 Solenoid Valve Cartridge - Pilot Operated - 40 L/Min - 350bar

    Key Features

    • Type: pilot operated solenoid poppet valve (SAE 8/2)
    • Flow rating: 40 L/min
    • Max pressure: 350 bar
    • Check function: check per model
    • Operation: 2-way; 2-position poppet with manual override on some variants
    • Use: remote open/close of line flow under pressure
    Regular price From £67.37
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    • Order by 3pm for Next Day Delivery
  • BSPP Adjustable Compensated Flow Control Valve
    Regular price From £43.16
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    BSPP Adjustable Compensated Flow Control Valve

    Key Features

    • Type: pressure-compensated adjustable flow control
    • Ports: as specified
    • Function: maintains set flow largely independent of load/pressure
    • Bypass: integrated check for free flow opposite direction
    • Use: stable actuator speed under varying loads
    Regular price From £43.16
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  • DIN 3/8" BSPP Double Acting Pilot Check Valve With Adjustable Banjo 12mm - Approved Hydraulics Limited
    Regular price £34.85
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    DIN 3/8" BSPP Double Acting Pilot Check Valve With Adjustable Banjo 12mm

    Key Features

    • Type: double acting pilot operated check valve with adjustable banjo
    • Ports: 3/8 BSPP
    • Function: locks actuator in both directions until pilot pressure opens
    • Benefit: load holding with controlled release
    • Use: cylinders that must hold position under load
    Regular price £34.85
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  • BSPP One Way Flow Control Valve - Barrel Type - Approved Hydraulics Limited
    Regular price From £21.68
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    BSPP One Way Flow Control Valve - Barrel Type

    Key Features

    • Type: one-way flow control (throttle/check)
    • Ports: as specified
    • Function: free flow one direction; metered flow opposite via needle
    • Body: barrel pattern for in-line mounting
    • Use: control extend or retract speed on cylinders
    Regular price From £21.68
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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.

  • 3/4" BSPP Bi-directional Flow Control Valve
    Regular price £40.24
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    3/4" BSPP Bi-directional Flow Control Valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 3/4 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £40.24
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  • 1" BSPP Bi-directional Flow Control Valve
    Regular price £52.50
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    1" BSPP Bi-directional Flow Control Valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 1 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £52.50
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Coil for Solenoid Valve 22W 24vDC - Approved Hydraulics Limited
    Regular price £9.16
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    Coil for Solenoid Valve 22W 12vDC

    Key Features

    • Type: wet-armature solenoid coil for hydraulic valves
    • Power: 22 W
    • Voltage: 12 V DC
    • Connector: DIN 43650-A plug compatible
    • Protection: IP65 with mated connector
    • Duty cycle: continuous service
    Regular price £9.16
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  • Coil for Solenoid Valve 22W 24vDC - Approved Hydraulics Limited
    Regular price £9.16
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    • Delivery to UK & Ireland

    Coil for Solenoid Valve 22W 24vDC

    Key Features

    • Type: wet-armature solenoid coil for hydraulic valves
    • Power: 22 W
    • Voltage: 24 V DC
    • Connector: DIN 43650-A plug compatible
    • Protection: IP65 with mated connector
    • Duty cycle: continuous service
    Regular price £9.16
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Tamper Proof Cap M20-M22 - RED Color
    Regular price £2.53
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    Tamper Proof Cap M20-M22 - RED Color

    Key Features

    • Type: tamper-proof cap for valve adjusters
    • Thread: M20 interface
    • Colour: red for quick identification
    • Function: prevents unauthorised adjustment and seals setting
    • Material: durable polymer or plated steel per variant
    Regular price £2.53
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC
    Regular price £3,384.06
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    Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC

    Key Features

    • Viscosity grade: iso vg 32
    • Base fluid: synthetic ; naturally occuring esters ; ashless additive package
    • Properties: high viscosity index ; anti wear ; anti oxidant ; anti foam ; anti corrosion
    • Environmental: virtually non toxic ; biodegradable
    • Packaging: 1000 l ibc
    • Use: hydraulics in environmentally sensitive areas ; marine ; forestry ; civil works
    Regular price £3,384.06
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    • Delivery to UK & Ireland
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  • Hydraulic Oil ISO 32, 1000 Litres IBC
    Regular price £1,548.06
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    Hydraulic Oil ISO 32, 1000 Litres IBC

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 1000 l ibc
    Regular price £1,548.06
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 20 Litres
    Regular price £47.46
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    Hydraulic Oil ISO 32, 20 Litres

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 20 l drum
    Regular price £47.46
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 205 Litre Barrel
    Regular price £446.39
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    • Delivery to UK & Ireland

    Hydraulic Oil ISO 32, 205 Litre Barrel

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 205 l barrel
    Regular price £446.39
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 2 Port Manifold for SA10/2 Cartridge 3/8” BSPP Ports - 350 Bar
    Regular price £13.01
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    2 Port Manifold for SA10/2 Cartridge 3/8” BSPP Ports - 350 Bar

    Key Features

    • Type: 2-port manifold block for SAE 10/2 screw-in cartridges
    • Ports: as specified
    • Pressure rating: 350 bar
    • Cavity: SAE 10/2 twin cavity arrangement
    • Body: machined manifold with threaded BSPP ports
    • Use: line mounting of cartridge valves in compact circuits
    Regular price £13.01
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 2 Port Manifold for SA10/2 Cartridge 1/2” BSPP Ports - 350 Bar
    Regular price £13.01
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    2 Port Manifold for SA10/2 Cartridge 1/2” BSPP Ports - 350 Bar

    Key Features

    • Type: 2-port manifold block for SAE 10/2 screw-in cartridges
    • Ports: as specified
    • Pressure rating: 350 bar
    • Cavity: SAE 10/2 twin cavity arrangement
    • Body: machined manifold with threaded BSPP ports
    • Use: line mounting of cartridge valves in compact circuits
    Regular price £13.01
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 2 Port Manifold For SAE8/2 Cartridge 3/8” BSPP Ports - 350 Bar
    Regular price £13.01
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    • Delivery to UK & Ireland

    2 Port Manifold For SAE8/2 Cartridge 3/8” BSPP Ports - 350 Bar

    Key Features

    • Type: hydraulic component
    • Design: high reliability construction for mobile hydraulics
    • Use: suits the specified application
    • Material: steel body with corrosion protection
    Regular price £13.01
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Tamper proof cap M8 - RED Color
    Regular price £1.28
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    • Delivery to UK & Ireland

    Tamper proof cap M8 - RED Color

    Key Features

    • Type: tamper-proof cap for valve adjusters
    • Thread: M10
    • Colour: red for quick identification
    • Function: prevents unauthorised adjustment
    • Material: durable polymer or plated steel per variant
    Regular price £1.28
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 2 Port Manifold For SAE8/2 Cartridge 1/4” BSPP Ports - 350 Bar
    Regular price £13.01
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    • Delivery to UK & Ireland

    2 Port Manifold For SAE8/2 Cartridge 1/4” BSPP Ports - 350 Bar

    Key Features

    • Type: hydraulic component
    • Design: high reliability construction for mobile hydraulics
    • Use: suits the specified application
    • Material: steel body with corrosion protection
    Regular price £13.01
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 5 - Steel Manifold with Relief Cavity - P&T 3/4" -  A&B 1/2"
    Regular price From £67.54
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    CETOP 5 - Steel Manifold with Relief Cavity - P&T 3/4" - A&B 1/2"

    Key Features

    • Standard: cetop 5 ; iso 4401-05 ; ng10
    • Ports: p ; t 3/4" bspp ; a ; b 1/2" bspp
    • Relief cavity: main pressure relief cavity provided ; blanking plug when no cartridge
    • Max working pressure: 315 bar
    • Circuit: parallel
    • Stations: 1 ; 2 ; 3 ; 4 ; 5 ; 6 options
    • Material: steel
    • Use: mounting of ng10 directional valves ; high flow manifolds
    Regular price From £67.54
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Steel Manifold with Relief Cavity - P&T 1/2" - A&B 3/8"
    Regular price From £42.97
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    CETOP 3 Steel Manifold with Relief Cavity - P&T 1/2" - A&B 3/8"

    Key Features

    • Standard: cetop 3 ; iso 4401-03 ; din 24340
    • Ports: p ; t 1/2" bspp ; a ; b 3/8" bspp
    • Relief cavity: main pressure relief cavity provided ; blanking plug when no cartridge
    • Max working pressure: 315 bar
    • Circuit: parallel
    • Stations: 1 ; 2 ; 3 ; 4 ; 5 ; 6 options
    • Material: steel
    • Use: mounting of ng6 directional valves on mini power packs ; manifolds
    Regular price From £42.97
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8 BSPP Insert Check Valve Ball Type - Cracking Pressure 0.5 Bar
    Regular price £4.45
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    • Delivery to UK & Ireland

    3/8 BSPP Insert Check Valve Ball Type - Cracking Pressure 0.5 Bar

    Key Features

    • Type: hydraulic component
    • Design: high reliability construction for mobile hydraulics
    • Use: suits the specified application
    • Material: steel body with corrosion protection
    Regular price £4.45
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8 BSPP Insert Reverse Check Valve Poppet Type - Cracking Pressure 0.5 Bar
    Regular price £23.27
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    3/8 BSPP Insert Reverse Check Valve Poppet Type - Cracking Pressure 0.5 Bar

    Key Features

    • Type: hydraulic component
    • Design: high reliability construction for mobile hydraulics
    • Use: suits the specified application
    • Material: steel body with corrosion protection
    Regular price £23.27
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8 BSPP Insert Check Valve Poppet Type - Cracking Pressure 0.5 Bar
    Regular price £16.35
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    • Delivery to UK & Ireland

    3/8 BSPP Insert Check Valve Poppet Type - Cracking Pressure 0.5 Bar

    Key Features

    • Type: hydraulic component
    • Design: high reliability construction for mobile hydraulics
    • Use: suits the specified application
    • Material: steel body with corrosion protection
    Regular price £16.35
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body
    Regular price £96.24
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    • Delivery to UK & Ireland

    Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body

    Key Features

    • Type: double acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price £96.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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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.