• 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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    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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    • 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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    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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  • 50L Control Valve Mid Return Manifold Section (SC1)
    Regular price £104.05
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    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 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
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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  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
  • 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 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
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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 Inlet Section (AC) - Approved Hydraulics Limited
    Regular price £100.00
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    • Delivery to UK & Ireland

    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 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
    • 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
  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    12VDC - 36W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 12 vdc
    • Power: 36 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve - Approved Hydraulics Limited
    Regular price £16.46
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    • Delivery to UK & Ireland

    24VDC - 37W- ED 100% Solenoid Only For 45L & 50L Unloader Valve

    Key Features

    • Voltage: 24 vdc
    • Power: 37 w
    • Duty cycle: ed 100% ; continuous
    • Application: coils for 45l ; 50l solenoid operated valves
    • Connector: 4 pin style per data sheet
    • Use: replacement coil only ; valve body not included
    Regular price £16.46
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Microswitch (Normally Open x M14 x 1.5 thread) - Approved Hydraulics Limited
    Regular price £14.65
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    • Delivery to UK & Ireland

    Microswitch (Normally Open x M14 x 1.5 thread)

    Key Features

    • Type: microswitch ; normally open
    • Thread: m14 x 1.5
    • Use: lever position sensing ; electrical signalling on control valves
    • Mounting: screws into dedicated boss on lever box/actuator kit
    • Contact rating: suits low current control circuits ; use relay for higher loads
    Regular price £14.65
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 45L - 50L 12V On/Off Electro Pneumatic Kit  8EP4 With With Manifold Block (30034555)
    Regular price £161.10
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    • Delivery to UK & Ireland

    45L - 50L 12V On/Off Electro Pneumatic Kit 8EP4 With With Manifold Block (30034555)

    Key Features

    • Kit: 8ep4 on/off electro pneumatic kit with manifold
    • Voltage: 12 vdc
    • Compatibility: 45l ; 50l valve families
    • Purpose: remote electrical actuation via air cylinder on spool
    • Controls: works with radio remote or switch outputs
    Regular price £161.10
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 45L - 50L 24V On/Off Electro Pneumatic Kit  8EP4 With With Manifold Block (30034555)
    Regular price £154.64
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    • Delivery to UK & Ireland

    45L - 50L 24V On/Off Electro Pneumatic Kit 8EP4 With With Manifold Block (30034555)

    Key Features

    • Kit: 8ep4 on/off electro pneumatic kit with manifold
    • Voltage: 24 vdc
    • Compatibility: 45l ; 50l valve families
    • Purpose: remote electrical actuation via air cylinder on spool
    • Controls: works with radio remote or switch outputs
    Regular price £154.64
    • All Items Guaranteed
    • 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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    • Delivery to UK & Ireland

    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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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £2.40
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    • Delivery to UK & Ireland

    50L Spool Seal Kit (1 x spool)

    Key Features

    • Compatibility: Hydra Part sectional control valves nominal 50 L/min class ; one spool section
    • Intended use: repack a single working section to cure external leaks and spool drag
    • Typical kit contents: spool o rings ; end cap seals ; dust seals used on 50L sections
    • Valve family: 3/8 inch port sectional valve spares range for 50 LPM systems
    • Install tip: clean bore ; lightly lubricate seals ; verify spool end float after rebuild
    • Result: restores smooth lever or solenoid actuation and reduces leakage to atmosphere
    Regular price £2.40
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Electrical plug for 12/24VDC coils EP3/4 kits - Approved Hydraulics Limited
    Regular price £1.49
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    • Delivery to UK & Ireland

    Electrical plug for 12/24VDC coils EP3/4 kits

    Key Features

    • Connector: DIN 43650-A ; 3 pole + earth
    • Ingress protection: IP65 with gasket
    • Rating: up to 240 vac ; 10 a
    • Use: mates to EP3/EP4 solenoid coils 12 ; 24 vdc
    • Application: hydraulic component
    Regular price £1.49
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

3/8" - 50Lpm - Sectional Valve Spares for Professional Hydraulic Applications

Discover quality 3/8" 50lpm sectional valve spares 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.