• AGRI PTO Gear Box 3:1 ratio for Group 2 Pumps - Male Shaft - Approved Hydraulics Limited
    Regular price From £127.08
    • All Items Guaranteed
    • Delivery to UK & Ireland

    AGRI PTO Gear Box 3:1 ratio for Group 2 Pumps - Male Shaft

    Key Features

    • Type: agricultural pto overgear
    • Ratio: 3 . 1
    • Pump interface: group 2
    • Output shaft: male
    • PTO speed: 540 rpm input ; geared for pump speed
    • Lubrication: sae 90 oil ; check level at 1500 h ; first change 60-80 h
    • Use: connects tractor pto to hydraulic gear pump
    Regular price From £127.08
    • All Items Guaranteed
    • 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
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
    • All Items Guaranteed
    • Delivery to UK & Ireland

    24vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 24 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A
    • Insulation class: Class H typical for DC coils
    • Protection: IP65 with gasketed DIN plug
    Regular price £124.93
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long - Approved Hydraulics Limited
    Regular price £124.93
    • All Items Guaranteed
    • Delivery to UK & Ireland

    12vDC Coil For HP-50 Monoblock Valve 24mm Dia Hole x 104mm Long

    Key Features

    • Valve family: HP50 solenoid sections
    • Voltage: 12 VDC
    • Core ; length: Ø 24 mm ; 60 mm long
    • Connector: DIN 43650 Form A or flying lead ; per build
    • Duty: continuous ; wet armature compatible
    • Protection: IP65 with correct DIN plug
    Regular price £124.93
    • All Items Guaranteed
    • 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.

  • 100L Control \Valve Mid Return Section 3/4" (Type CS1)
    Regular price £123.28
    • All Items Guaranteed
    • Delivery to UK & Ireland

    100L Control \Valve Mid Return Section 3/4" (Type CS1)

    Key Features

    • Section type: mid return section (cs1)
    • Port size: 3/4" bsp
    • Compatibility: 100l gs sectional control valve
    • Function: provides tank return path within the stack
    • Use case: inserted between working sections when mid stack return is required
    Regular price £123.28
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1" Male Female Tipper Quick Release  Coupling (Set) - Approved Hydraulics Limited
    Regular price £123.05
    • All Items Guaranteed
    • Delivery to UK & Ireland

    1" Male Female Tipper Quick Release Coupling (Set)

    Key Features

    • Size: 1"
    • Type: screw type quick release set
    • Ends: male ; female pair
    • Use: tipper circuit disconnect
    • Application: single acting tipping gear
    Regular price £123.05
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part Hydra Part Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out - Approved Hydraulics
    Regular price £122.80
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

    Log Splitter Valve 80LPM (A&B 1/2" BSP) (P&T 3/4" BSP) Auto Kick Out

    Key Features

    • Type: spring centred ; pressure released detent auto return
    • Nominal flow: 80 to 81 l/min
    • Ports: inlet ; outlet 3/4' bsp ; work a ; b 1/2' bsp
    • Function: auto kick out to neutral at end of extend stroke
    • Relief: adjustable system relief integrated
    Regular price £122.80
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part CETOP 5 Pressure Reducing Module Valve - B to T (ZPR-10-D-B-1-210-YM) - Approved Hydraulics
    Regular price £121.68
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Pressure Reducing Module Valve - B to T (ZPR-10-D-B-1-210-YM)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pressure reducing module b to t
    • Max operating pressure: 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 60 lpm
    • Temperature: -20 c to +80 c
    Regular price £121.68
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • JS200/2 Cable Operated Joystick
    Regular price £121.42
    • All Items Guaranteed
    • Delivery to UK & Ireland

    JS200/2 Cable Operated Joystick

    Key Features

    • Type: Cable operated remote control joystick
    • Model: JS200/2
    • Control: Single lever controls two spools via cables
    • Buttons: Up to 6 auxiliary push buttons possible
    • Ingress: IP40 class typical
    • Applications: Brush cutters ; loaders ; balers ; mixers
    Regular price £121.42
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, P to T - A & B Blocked - Approved Hydraulics
    Regular price From £120.56
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, P to T - A & B Blocked

    Key Features

    • Centre spool: p to t ; a and b blocked
    • 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 £120.56
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Mid Return Section (CS1) - Approved Hydraulics Limited
    Regular price £120.53
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L Control Valve Mid Return Section (CS1)

    Key Features

    • Series: 80L GS sectional control valve
    • Section: mid return (CS1)
    • Main ports: P G 1/2 ; A ; B G 1/2 ; T ; C G 3/4
    • Circuits: parallel ; tandem ; series with carry-over
    • Applications: mobile hydraulics ; loaders ; cranes
    Regular price £120.53
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Inline Pressure Relief Valve 3/8" Bsp 35Lpm 350 Bar Max - Approved Hydraulics
    Regular price £118.18
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Inline Pressure Relief Valves 1" BSP

    Key Features

    • Type: direct acting inline pressure relief valve
    • Ports: bsp per size
    • Setting: adjustable with locknut
    • Use: over pressure protection for circuits
    • Pressure: 315 to 350 bar typical
    Regular price £118.18
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part Hydraulic 3 Port Flow Control Valve (Excess Back To Tank)  1/2" - Approved Hydraulics
    Regular price £118.14
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic 3 Port Flow Control Valve (Excess Back To Tank) 1/2"

    Key Features

    • Function: 3 way priority flow ; excess to tank
    • Port size: 1/2' bsp
    • Compensation: pressure compensated constant priority flow
    • Max pressure: up to 350 bar
    • Use: set actuator speed independent of load
    Regular price £118.14
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £116.29
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 All Ports Connected with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; all ports connected
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £116.29
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Blocked - Approved Hydraulics
    Regular price From £114.26
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, All Ports Blocked

    Key Features

    • Centre spool: all ports blocked
    • 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 £114.26
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked - Approved Hydraulics
    Regular price From £114.26
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked

    Key Features

    • Centre spool: a and b to t ; p blocked
    • 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 £114.26
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" BSP IN-LINE 80 lpm RELIEF VALVE - 100-350 bar
    Regular price £112.27
    • All Items Guaranteed
    • Delivery to UK & Ireland

    3/4" BSP IN-LINE 80 lpm RELIEF VALVE - 100-350 bar

    Key Features

    • Ports: 3/4" BSPP inline
    • Flow: 80 l.min
    • Adjustment range: 100–350 bar
    • Function: direct acting relief ; protects downstream circuits
    • Construction: zinc plated steel body ; hardened internals
    Regular price £112.27
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Double Acting Cylinder 70mm Bore Rams - Approved Hydraulics
    Regular price From £111.35
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Double Acting Hydraulic Cylinder 70mm Bore Rams

    Key Features

    • Bore: 70 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £111.35
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Clockwise Group 2 Tandem Hydraulic Pumps - Rear - Approved Hydraulics Limited

    POA

    • All Items Guaranteed
    • Delivery to UK & Ireland

    Clockwise Group 2 Tandem Hydraulic Pumps - Rear

    Key Features

    • Type: group 2 tandem external gear pump
    • Displacement: 4.5 to 25 cc per rev per section
    • Rotation: clockwise
    • Mounting: 2 or 4 bolt flange per variant
    • Use: supply multiple circuits from one drive

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Hydra Part Double Acting Cylinder 25mm Bore Rams - Approved Hydraulics
    Regular price From £109.80
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Double Acting Hydraulic Cylinder 25mm Bore Rams

    Key Features

    • Bore: 25 mm
    • Action: double acting
    • Mounting: pin eye both ends
    • Max pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature: -25 c to +80 c
    • Stroke options: 50 to 1000 mm series range
    Regular price From £109.80
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part Tipper & PTO Cab Control Unit - Approved Hydraulics
    Regular price £109.62
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Tipper & PTO Cab Control Unit

    Key Features

    • Use case: In-cab control of PTO engagement and tipping functions
    • Use case: Power take off unit for driving hydraulic pumps on commercial vehicle gearboxes
    • Notes: Specification information is limited in source listing; confirm dimensions and compatibility before purchase
    • Notes: Details not stated
    • Notes: Details not stated
    Regular price £109.62
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part 3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar - Approved Hydraulics
    Regular price £109.37
    • All Items Guaranteed
    • Delivery to UK & Ireland

    3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar

    Key Features

    • Type: dual cross line relief valve
    • Port size: 3/8"bsp
    • Rated flow: 35 lpm
    • Adjustment range: 100 to 350 bar
    • Function: protects hydraulic motors from shock loads ; cross connected relief
    • Mounting: in line ; flangeable to motor on some models
    • Typical use: omp ; omr ; omh motor protection ; overrunning load control
    Regular price £109.37
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Intermediate Section With Relief Valve & Auxillery Inlet
    Regular price £109.10
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L Control Valve Intermediate Section With Relief Valve & Auxillery Inlet

    Key Features

    • Function: intermediate section with integrated relief valve
    • Auxiliary inlet: additional feed port to the stack
    • Series: 80l sectional valve
    • Adjustment: relief pressure adjustable per system design
    • Use: protects downstream sections ; manages supply pressure
    Regular price £109.10
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Single Counter Balance / Overcentre Valve 3/8" IN LINE Steel Body 100-350 Bar 1:8 Pilot Ratio - Approved Hydraulics Limited
    Regular price £108.84
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Single Counter Balance / Overcentre Valve 3/8" IN LINE Steel Body 100-350 Bar 1:8 Pilot Ratio

    Key Features

    • Type: single counterbalance ; overcentre valve
    • Port size: 3/8"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £108.84
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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.