• 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £9.71
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    5/8" BSP Male x 1/2" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor female to female
    • Threads: 5/8 to 1/2 BSP
    • Swivel: captive nuts allow hose connection without twisting
    • Seal: flat-faced or washered seal depending on variant
    • Use: hose-to-hose connection where orientation matters
    Regular price £9.71
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    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £7.55
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    5/8" BSP Male x 3/4" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 5/8 to 3/4 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 £7.55
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    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.78
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    5/8" BSP Male x 5/8" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (male to female)
    • Threads: 5/8 to 5/8 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 £6.78
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve  Pressure compensated Flow Divider Section Type DFG
    Regular price £423.36
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    50L Control Valve Pressure compensated Flow Divider Section Type DFG

    Key Features

    • Series: 50L 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 £423.36
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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.

  • 50L Control Valve (Right inlet) Section c/w Relief Valve (BC)
    Regular price £62.14
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    50L Control Valve (Right inlet) Section c/w Relief Valve (BC)

    Key Features

    • Series: 50L 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 £62.14
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve 2 Bank Tie Rod Kit (3 Rods / kit) M8x1.25 x 166mm Long - Approved Hydraulics Limited
    Regular price £12.28
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    50L Control Valve 2 Bank Tie Rod Kit (3 Rods / kit) M8x1.25 x 166mm Long

    Key Features

    • Kit: tie rods for 2 bank assembly . 3 rods per kit
    • Thread: m8x1.25
    • Rod length: 166 mm
    • Compatibility: 50l gs sectional valves
    • Function: clamps sections and endplates together
    Regular price £12.28
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    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Direct Acting Electric Solenoid Motor Spool  2 (ES)
    Regular price £21.64
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    50L Control Valve Direct Acting Electric Solenoid Motor Spool 2 (ES)

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: motor spool ; type 2
    • Neutral function: A & B open in neutral
    • Intended use: hydraulic motors ; freewheeling to avoid overrunning loads
    • Section type: double acting working section compatible
    • Typical circuits: open centre ; closed centre with carry-over
    Regular price £21.64
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    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Direct Acting Spool Double Acting For Electric Solenoid Operation  1 (ES)
    Regular price £34.24
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    50L Control Valve Direct Acting Spool Double Acting For Electric Solenoid Operation 1 (ES)

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: double acting ; type 1 (ES)
    • Actuation: direct acting electric solenoid
    • Use case: cylinders ; bi-directional functions
    • Positioning: suits electro-hydraulic control kits
    • Typical circuits: open centre ; series ; parallel
    Regular price £34.24
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Double Acting Spool (Type 1)
    Regular price £28.43
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    50L Control Valve Double Acting Spool (Type 1)

    Key Features

    • Spool: double acting ; 3 positions (type 1)
    • Series: 50 l sectional valve
    • Neutral: A ; B closed in neutral
    • Use: bidirectional cylinder control
    • Application: hydraulic component
    Regular price £28.43
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Double Acting Working Section - Approved Hydraulics Limited
    Regular price £125.74
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    50L Control Valve Double Acting Working Section

    Key Features

    • Spool: double acting ; 3 positions ; spring return
    • Series: 50l sectional valve
    • Neutral state: A ; B blocked in neutral
    • Mounting: installs between inlet and tank sections via tie rods
    • Typical applications: cylinder extension ; retraction control
    • Port size: per series standard
    Regular price £125.74
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve High Pressure Carry Over Taper Blanking Plug 1/4" - Approved Hydraulics Limited
    Regular price £2.68
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    50L Control Valve High Pressure Carry Over Taper Blanking Plug 1/4"

    Key Features

    • Feature: high pressure carry over ; power beyond adapter
    • Compatibility: 50l monoblock valve
    • Port size: 1/4"
    • Use: feeds downstream valves while maintaining upstream relief
    • Install: replaces blanking plug in outlet cavity
    Regular price £2.68
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Inlet Section (AC) - Approved Hydraulics Limited
    Regular price £100.00
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    50L Control Valve Inlet Section (AC)

    Key Features

    • Series: 50L GS sectional control valve
    • Section: mid inlet section
    • Main ports: P G 1/2 ; A ; B G 1/2 ; T ; C G 3/4 options
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £100.00
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve MID Inlet section with relief (E12)
    Regular price £69.18
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    50L Control Valve MID Inlet section with relief (E12)

    Key Features

    • Section type: mid inlet (e12) with pressure relief
    • Compatibility: 50l gs sectional valve
    • Function: adds pump inlet mid stack and adjustable relief
    • Typical flow class: 50 l/min nominal
    • Relief range (typical): 0 ; 315 bar adjustable
    Regular price £69.18
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    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Mid Return Manifold Section (SC1)
    Regular price £104.05
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    • Delivery to UK & Ireland

    50L Control Valve Mid Return Manifold Section (SC1)

    Key Features

    • Series: 50L GS sectional control valve
    • Section: mid return (CS1)
    • Main ports: P G 1/2 ; A ; B G 1/2 ; T ; C G 3/4 options
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £104.05
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Motor Spool (Type 2) - Approved Hydraulics Limited
    Regular price £28.43
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    • Delivery to UK & Ireland

    50L Control Valve Motor Spool (Type 2)

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: motor spool ; type 2
    • Neutral function: A & B open in neutral
    • Intended use: hydraulic motors ; freewheeling to avoid overrunning loads
    • Section type: double acting working section compatible
    • Typical circuits: open centre ; closed centre with carry-over
    Regular price £28.43
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Outlet Section (RC) - Approved Hydraulics Limited
    Regular price £34.87
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    • Delivery to UK & Ireland

    50L Control Valve Outlet Section (RC)

    Key Features

    • Series: 50L GS sectional control valve
    • Section: outlet ; tank return
    • Main ports: P G 1/2 ; A ; B G 1/2 ; T ; C G 3/4 options
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £34.87
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Service port & anti caitation valve for 50L GS08 Series (0-300 BAR) - Approved Hydraulics Limited
    Regular price £54.23
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    • Delivery to UK & Ireland

    50L Control Valve Service port & anti caitation valve for 50L GS08 Series (0-300 BAR)

    Key Features

    • Series: 50L 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 £54.23
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Service Port Blanking Plug
    Regular price £6.58
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    • Delivery to UK & Ireland

    50L Control Valve Service Port Blanking Plug

    Key Features

    • Series: 50L 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 £6.58
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Single Acting Spool On A Port, (Type 3)  3 positions, B plugged
    Regular price £20.51
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    50L Control Valve Single Acting Spool On A Port, (Type 3) 3 positions, B plugged

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: single acting ; type 3
    • Porting: A port active ; B port plugged
    • Positions: 3 positions
    • Typical use: single acting cylinder operation
    Regular price £20.51
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Single Acting Spool On B Port, (Type 4)  3 positions, A plugged - Approved Hydraulics Limited
    Regular price £20.51
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    • Delivery to UK & Ireland

    50L Control Valve Single Acting Spool On B Port, (Type 4) 3 positions, A plugged

    Key Features

    • Series: 50L GS sectional control valve
    • Spool type: single acting ; type 4
    • Porting: B port active ; A port plugged
    • Positions: 3 positions
    • Typical use: single acting cylinder operation
    Regular price £20.51
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Tie Rod Kit - 3 Bank (3 Rods / kit) M8 x1.25 x 204mm long - Approved Hydraulics Limited
    Regular price £15.06
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    • Delivery to UK & Ireland

    50L Control Valve Tie Rod Kit - 3 Bank (3 Rods / kit) M8 x1.25 x 204mm long

    Key Features

    • Series: 50L GS sectional control valve
    • Bank size: 3 bank
    • Length: 204 mm
    • Thread: M8x1.25
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £15.06
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Unloader Cartridge (No Coil)  c/w Push Button Emergency Over-ride (ELP N/O)
    Regular price £139.99
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    • Delivery to UK & Ireland

    50L Control Valve Unloader Cartridge (No Coil) c/w Push Button Emergency Over-ride (ELP N/O)

    Key Features

    • Series: 50L 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 £139.99
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 50L Control Valve Unloader Cartridge (No Coil) c/w Push & Twist Manual Override (ELT N/O) - Approved Hydraulics Limited
    Regular price £139.99
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    • Delivery to UK & Ireland

    50L Control Valve Unloader Cartridge (No Coil) c/w Push & Twist Manual Override (ELT N/O)

    Key Features

    • Valve type: unloader cartridge ; normally open (elt n/o)
    • Manual override: push & twist latch operation
    • Coil: not supplied ; requires matching 12 vdc ; 24 vdc coil
    • Intended use: diverts pump flow to tank when de energised ; unloads system
    • Installation: screws into valve body cartridge cavity for 50l series
    Regular price £139.99
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 50L GS Sectional Control Valve - Approved Hydraulics
    Regular price From £244.34
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    • Delivery to UK & Ireland

    50L GS Sectional Control Valve

    Key Features

    • Type: sectional directional valve
    • Nominal flow: 50 lpm
    • Sections: 1 to 12
    • Integrated valves: main relief ; load check on each section
    • Circuit options: parallel ; tandem ; series
    • Carry over: hp carry over port optional
    • Spool control: manual ; pneumatic ; hydraulic ; electro-hydraulic ; remote cable
    Regular price From £244.34
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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.