• High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar - Approved Hydraulics Limited
    Regular price £108.67
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    High Pressure 3 Port Manual Diverter Valve - Steel 3/4" 500Bar

    Key Features

    • Type: 3 port manual lever diverter ; open centre
    • Pressure rating: up to 500 bar
    • Port size: 3/4"
    • Function: diverts inlet to a or b ; closed centre when specified
    • Use: circuit selection on high pressure lines
    Regular price £108.67
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  • 8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit - Approved Hydraulics Limited
    Regular price £108.35
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    8P Pneumatic Kit 80L-90L-100L-120L-150L control valve Pneumatic Kit

    Key Features

    • Kit: pneumatic actuation for sectional control valves
    • Compatibility: 80 l ; 90 l ; 100 l ; 120 l ; 150 l control valves
    • Supply: compressed air 6 ; 10 bar typical
    • Contents: cylinders ; brackets ; hoses ; fittings
    • Use: remote spool operation from cab or pendant
    Regular price £108.35
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  • Out of Stock
    3/8" 3 Way Adjustable Priority Flow Control Valve  - Excess to Line. - Approved Hydraulics Limited
    Regular price £107.47
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    3/8" 3 Way Adjustable Priority Flow Control Valve - Excess to Line.

    Key Features

    • Ports: G 3/8 BSPP
    • Function: 3 way pressure compensated priority flow control
    • Max inlet flow: 60 l.min
    • Max outlet C flow: 35 l.min
    • Max pressure: 270 bar
    • Body: aluminium body ; hardened steel internals
    • Use: set constant actuator flow with excess to tank or secondary circuit
    Regular price £107.47
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  • Standard 90L Lever Operated Double Acting Monoblock Valves (1/2"BSP) (1-6 Levers) - Approved Hydraulics Limited
    Regular price From £107.20
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    Standard 90L Lever Operated Double Acting Monoblock Valves (1/2"BSP) (1-6 Levers)

    Key Features

    • Nominal Flow Rating: 90L/Min
    • Max Flow: 100L
    • Max Operating Pressure: 315 Bar - 4600 Psi
    • Specification: Built In Port For The Option Of A High Pressure Carry Over
    • Specification: Pneumatic kits for air operation
    • Ports: 1/2" BSP
    • Levers: 1-6 options
    • Specification: 1/2" Ported Double Acting Monoblock Valves
    • Specification: Built in Adjustable Main Relief Valve
    • Specification: Spring Return To Neutral
    Regular price From £107.20
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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.

  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Open - Approved Hydraulics
    Regular price From £106.97
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    CETOP 5 Double Solenoid Control Valve NG10, All Ports Open

    Key Features

    • Centre spool: all ports open
    • Interface: iso 4401-05 cetop 5 ng10
    • Max flow: 120 lpm
    • Max pressure: p ; a ; b 315 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £106.97
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  • 2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable - Approved Hydraulics Limited
    Regular price £106.91
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    2 Axis Cable Joystick With 2 Electric Buttons & 1m Electric Cable

    Key Features

    • 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 £106.91
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  • Mini Radio Remote Control 4 Button For 2 x Double  Actiong Valves Operation 12-24VDC - Approved Hydraulics Limited
    Regular price £106.88
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    Mini Radio Remote Control 4 Button For 2 x Double Actiong Valves Operation 12-24VDC

    Key Features

    • Control: 2 x double acting valves
    • Buttons: 4
    • Supply: 12 vdc ; 24 vdc
    • Interface: radio wireless control
    • Typical applications: multi function mobile hydraulics ; cranes ; tail lifts ; tippers
    Regular price £106.88
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  • Out of Stock
    1/2" 4 Bank 45L Monoblock Control Valve - Approved Hydraulics Limited
    Regular price £106.80
    Regular price £124.76 Sale price Saving 14%
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    1/2" 4 Bank 45L Monoblock Control Valve

    Key Features

    • Valve type: monoblock control valve
    • Flow rating: 45 l/min
    • Banks: 4
    • Ports: 1/2" bspp work ports
    • Operation: lever
    • Use: compact hydraulic circuits
    Regular price £106.80
    Regular price £124.76 Sale price Saving 14%
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  • 100L Control valve Inlet  Section 3/4 Left Inlet (AC)
    Regular price £104.42
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    100L Control valve Inlet Section 3/4 Left Inlet (AC)

    Key Features

    • Section type: left inlet (ac) with pressure relief
    • Port size: 3/4" bsp
    • Compatibility: 100l gs sectional control valve
    • Function: pump inlet and adjustable system relief
    • Relief range (typical): 60 ; 315 bar adjustable
    Regular price £104.42
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  • Hydraulic Differential Type Relief Valve, VMPP 3/4" (20-200 Bar Adjustment) - Approved Hydraulics Limited
    Regular price £104.39
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    Hydraulic Differential Type Relief Valve, VMPP 3/4" (20-200 Bar Adjustment)

    Key Features

    • Type: differential poppet pressure relief valve VMPP
    • Ports: 3/8" BSPP P ; T
    • Setting range: 100–250 bar adjustable
    • Nominal flow variants: 20 l.min ; 50 l.min options
    • Leakage: guided poppet ; negligible leakage
    • Materials: zinc plated steel body ; hardened internals
    Regular price £104.39
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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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  • Hydra Part Tipper Cab Control Unit (Tip Only) - Approved Hydraulics
    Regular price £103.88
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    Tipper Cab Control Unit (Tip Only)

    Key Features

    • Use case: In-cab control of PTO engagement and tipping functions
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £103.88
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  • Hydra Part 3 Port Solenoid Diverter Valve 3/8" 12/24vDC - Approved Hydraulics
    Regular price £103.64
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    3 Port Closed Centre Solenoid Diverter Valve 3/8" 80LPM 12/24vDC

    Key Features

    • Type: 3 port 2 position diverter valve
    • Ports: 3/8" BSP
    • Actuation: solenoid 12V or 24V DC
    • Function: redirects flow between two circuits in closed centre systems
    • Mounting: line mounted body
    • Brand: Hydra Part; data sheet available
    Regular price £103.64
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  • Mini Radio Remote Control 2 Button For Double  Acting Operation 12-24VDC - Approved Hydraulics Limited
    Regular price £103.55
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    Mini Radio Remote Control 2 Button For Double Acting Operation 12-24VDC

    Key Features

    • Control: double acting operation
    • Buttons: 2
    • Supply: 12 vdc ; 24 vdc
    • Interface: radio wireless control
    • Use: remote actuation of mini power packs ; tipper ; liftgate ; winch circuits
    Regular price £103.55
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  • Mini Radio Remote Control 2 Button For Single Acting Operation 12-24VDC - Approved Hydraulics Limited
    Regular price £103.55
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    Mini Radio Remote Control 2 Button For Single Acting Operation 12-24VDC

    Key Features

    • Mode: single acting operation
    • Buttons: 2
    • Supply: 12 ; 24 vdc
    • Use: compact wireless control
    • Application: hydraulic component
    Regular price £103.55
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  • MINI Power Pack  1.6 cc/r  Grp 1 pump - Approved Hydraulics Limited
    Regular price £102.65
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    MINI Power Pack 1.6 cc/r Grp 1 pump

    Key Features

    • Pump group: group 1 external gear pump
    • Displacement: 1.6 cc/rev
    • Rotation: ccw
    • Use: mini hydraulic power pack builds
    • Compatibility: b14 mounting kits ; group 1 couplings
    Regular price £102.65
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  • KV Diverter Valve 24VDC Coil 31mm Dia hole x 42mm Long (Din Plug Connection) - Approved Hydraulics Limited
    Regular price £102.49
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    KV Diverter Valve 24VDC Coil 31mm Dia hole x 42mm Long (Din Plug Connection)

    Key Features

    • Part number: HP-C5-24DC-COIL
    • Supply voltage: 24 VDC
    • Coil bore: 31 mm diameter hole
    • Coil length: 42 mm long
    • Electrical connection: DIN plug connection
    • Compatibility: KV diverter valve solenoid actuator
    • Function: Energises diverter valve to switch hydraulic flow path
    Regular price £102.49
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  • KV Diverter Valve 12V Coil - Approved Hydraulics Limited
    Regular price £102.49
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    KV Diverter Valve 12V Coil

    Key Features

    • Part number: HP-C5-12DC-COIL
    • Supply voltage: 12 VDC
    • Compatibility: KV diverter valve solenoid actuator
    • Electrical connection: DIN plug connection
    • Function: Energises diverter valve to switch hydraulic flow path
    • Typical use: Flow diversion on mobile hydraulics and auxiliary circuits
    Regular price £102.49
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  • Hydra Part 6 Port Solenoid Diverter Valve 3/8" Open Centre 50LPM 12/24vDC - Approved Hydraulics
    Regular price £102.36
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    6 Port Closed Centre Solenoid Diverter Valve 3/8" 50LPM 12vDC/24vDC

    Key Features

    • Type: 6 port 2 position stackable diverter
    • Nominal flow: 50 L/min
    • Max operating pressure: up to 250 bar; 350 bar with drain (typical)
    • Ports: 3/8" BSP
    • Actuation: solenoid 12V or 24V DC
    • Use: add auxiliary circuit from a single control lever
    • Stacking: multiple valves can be used in series
    Regular price £102.36
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  • Hydra Part CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315) - Approved Hydraulics
    Regular price £102.11
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    CETOP 5 Pressure Relief Valve Module - P to T (ZPB-10-VP-1-315)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pilot operated pressure relief p to t
    • Max operating pressure: 315 bar
    • Max flow: 100 l/min
    • Temp range: -20 c to +70 c
    • Weight: 2.6 kg
    • Typical use: system relief on cetop 5 stacks
    Regular price £102.11
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  • Out of Stock
    Hydra Part Fuel Nozzle (Gravity Fed) 1"BSP Fitting - Approved Hydraulics
    Regular price £102.06
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    Fuel Nozzle (Gravity Fed) 1"BSP Fitting

    Key Features

    • Type: fuel dispensing nozzle
    • Mode: gravity fed
    • Connection: 1" bsp fitting
    • Use: diesel ; heating oil ; kerosene per nozzle spec
    • Notes: choose nozzle to match flow source ; pump or gravity
    Regular price £102.06
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  • ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings - Approved Hydraulics Limited
    Regular price £101.12
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    ADAPTOR EN/ISO /4 Bolts) to PUMP UNI (3 Bolts); With One Ball Bearings

    Key Features

    • Mounting interfaces: PTO EN.ISO 4 bolt to UNI 3 bolt
    • Integrated bearing: one ball bearing
    • Max torque: 315 N.m
    • Max power at 1000 rpm: 33 kW
    • Use case: fit UNI 3 bolt pumps to ISO 4 bolt PTO housings
    • Construction: steel adaptor with precision machining
    • Accessories: studs ; gaskets available in kits
    Regular price £101.12
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  • Single Counter Balance / Overcentre Valve 3/8" IN LINE Ally Body 100 - 350 bar 4.2:1 Ratio - Approved Hydraulics Limited
    Regular price £100.57
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    Single Counter Balance / Overcentre Valve 3/8" IN LINE Ally Body 100 - 350 bar 4.2:1 Ratio

    Key Features

    • Ports: G 3/8 BSPP
    • Type: single overcentre ; external pilot
    • Max flow: 40 l.min
    • Max pressure: 350 bar
    • Setting range: 50 to 350 bar adjustable
    • Pilot ratio options: 4.25.1 standard ; 8.75.1 options
    • Use: load holding ; smooth controlled lowering on single acting loads
    Regular price £100.57
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  • 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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Hydra Part for Professional Hydraulic Applications

Discover quality hydra part 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 lever operated monoblock valves, cetop 3 spares, scanreco spares accessories, scanreco 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.