• CETOP 3 Manual Override Cap (Screw Type) - Approved Hydraulics Limited
    Regular price £18.42
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    CETOP 3 Manual Override Cap (Screw Type)

    Key Features

    • Type: manual override cap for cetop 3 valve
    • Interface: fits din 24340 ; iso 4401 03 valves
    • Style: screw type override
    • Use: manual operation for setup or emergency
    • Seal: o ring under cap
    • Material: steel or polymer head
    Regular price £18.42
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  • Hydra Part Top Link Double Pilot Check Valve 1/2"BSP  50Lpm - Approved Hydraulics
    Regular price £81.46
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    Top Link Double Pilot Check Valve 3/4"BSP

    Key Features

    • Type: double pilot operated check valve
    • Threads: 3/4" BSP
    • Function: locks load until pilot pressure releases checks
    • Use: load holding on cylinders and top links
    • Pressure: 315 to 350 bar class
    Regular price £81.46
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  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £127.80
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    CETOP 3 All Ports Blocked with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; all ports blocked
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £127.80
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  • AGRI PTO Gear Box 3:1 ratio for Group 2 Pumps - Male Shaft - Approved Hydraulics Limited
    Regular price From £127.08
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    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
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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.

  • Hydra Part 3/8" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £146.54
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    3/8" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Port size: 3/8\" bsp
    • Type: 3 port priority flow control
    • Compensation: pressure compensated priority flow
    • Bypass: excess flow bypass to line
    • Use: maintains set actuator flow under load changes
    Regular price £146.54
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  • AGRI PTO Gear Box 3:1 ratio for Group 2 or 3 Pumps - Male Shaft - Approved Hydraulics Limited
    Regular price From £203.46
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    AGRI PTO Gear Box 3:1 ratio for Group 2 or 3 Pumps - Male Shaft

    Key Features

    • Function: pto overgear for tractor 540 rpm to pump speed x3
    • Ratio: 1 . 3 increase
    • Pump groups: group 2 ; group 3
    • Lubrication: sae 90 gear oil recommended
    • Typical power: up to 20 to 30 kw depending on model
    Regular price From £203.46
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  • Hydra Part Poppet Check Valve 1" 180Lpm, 280 Bar Max Pressure - Approved Hydraulics
    Regular price £25.82
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    Poppet Check Valve 1" 180Lpm, 280 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 1' bsp
    • Max flow: 180 l/min
    • Max pressure: 280 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £25.82
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  • Hydra Part 3/4" Hydraulic Two Pump High Low Unloading Valve - Approved Hydraulics
    Regular price £272.81
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    3/4" Hydraulic Two Pump High Low Unloading Valve

    Key Features

    • Function: two pump hi low unloading
    • Port size: 3/4' bsp
    • Max flow: 80 l/min
    • Max pressure: 350 bar
    • Use: unload high flow pump once set pressure reached
    Regular price £272.81
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  • Out of Stock
    Hydra Part Hydraulic 3 Port Flow Control Valve (Excess Back To Tank)  1/2" - Approved Hydraulics
    Regular price £107.40
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    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 £107.40
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  • DIN 3/8 BSPP Double Acting Pilot Check Valve - Pipe12 - Approved Hydraulics Limited
    Regular price £22.07
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    DIN 3/8 BSPP Double Acting Pilot Check Valve - Pipe12

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 3/8 thread
    • 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 £22.07
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  • Hydra Part CETOP 3 Modular Pressure Relief Valve - P to T - (ZPB-6-VP-1-315) - Approved Hydraulics
    Regular price £82.20
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    CETOP 3 Modular Pressure Relief Valve - P to T - (ZPB-6-VP-1-315)

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Function: pilot operated pressure relief p to t
    • Max operating pressure: 315 bar
    • Max flow: 60 l/min
    • Temp range: -20 c to +70 c
    • Weight: 1.3 kg
    • Typical use: system overpressure protection on cetop 3 stacks
    Regular price £82.20
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  • Hydra Part CETOP 3 single solenoid control valve NG06 P to A  B & T blocked - Approved Hydraulics
    Regular price From £53.48
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    CETOP 3 single solenoid control valve NG06 P to A B & T blocked

    Key Features

    • Centre spool: p to a ; b and t blocked
    • Solenoid: single solenoid
    • Interface: iso 4401-03 cetop 3 ng06
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 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 £53.48
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  • Scanreco Decal Set (45676)
    Regular price £7.52
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    Scanreco Decal Set (45676)

    Key Features

    • Type: transmitter decal set
    • Compatibility: scanreco mini ; maxi panels
    • Material: uv resistant self adhesive overlays
    • Function: replace function legends and symbols
    • Use: refresh worn labels on remote transmitters
    Regular price £7.52
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  • M5 x 150 Cap head bolt
    Regular price £2.21
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    M5 x 150 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 150 mm
    • Drive: internal hex for controlled tightening
    • Use: hydraulic assemblies; covers; brackets
    Regular price £2.21
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  • 2" BSP Male-Male Adaptor
    Regular price £57.80
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    2" BSP Male-Male Adaptor

    Key Features

    • Type: Male to male BSP adaptor
    • Thread size: 2" BSPP or BSPT depending on variant
    • Material: Steel or brass per build
    • Standards: Threads to BS EN ISO 228 ; DIN 3852 form A
    • Use: Join two female BSP ports ; hose or manifold interface
    Regular price £57.80
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  • JS200/2 Cable Operated Joystick
    Regular price £101.17
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    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 £101.17
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  • Series 620 Top Link Cylinders - Approved Hydraulics Limited
    Regular price From £331.32
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    Series 620 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link for medium ; large tractors
    • Bore ; rod range: 60/35 mm up to 100/45 mm options
    • Rated pressure: 200 bar typical ; 250 bar max
    • Check valve: Often supplied with double pilot operated check for position holding
    • Supply: Complete with hoses
    • Applications: Implements angle control ; hitch adjustment
    Regular price From £331.32
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  • 1/2" Port, Straight, 40mm PCD, Female Gear Pump Adaptors
    Regular price £6.25
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    1/2" Port, Straight, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: straight
    • Port: 1/2"
    • Mounting: 3/4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £6.25
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  • 1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors
    Regular price £6.88
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    1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 30 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £6.88
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  • Out of Stock
    HP-LVDT-DIN Double Pilot Check Valves
    Regular price From £32.94
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    HP-LVDT-DIN Double Pilot Check Valves

    Key Features

    • Type: double pilot operated check valve
    • Threads: BSP
    • Function: locks load until pilot pressure releases checks
    • Use: load holding on cylinders and top links
    • Pressure: 315 to 350 bar class
    Regular price From £32.94
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  • Out of Stock
    Hydra Part Inline Pressure Relief Valve 3/8" Bsp 35Lpm 350 Bar Max - Approved Hydraulics
    Regular price From £107.42
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    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 From £107.42
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  • Out of Stock
    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 1x Double Acting CETOP - 160bar Preset
    Regular price From £272.21
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    Double Acting Hydraulic Power Pack With Starter Solenoid - 1.6kW - 1x Double Acting CETOP - 160bar Preset

    Key Features

    • Circuit: 1x double acting cetop
    • Motor: 1.6 kw
    • Pressure: 160 bar preset
    • Supply: 12 vdc ; 24 vdc
    • Notes: built to order
    Regular price From £272.21
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  • Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-1400 Psi (100 Bar) 1/2" Rear Entry - Approved Hydraulics
    Regular price £21.61
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    100mm Glycerine Hydraulic Pressure Gauge 0-1400 Psi (100 Bar) 1/2" Rear Entry

    Key Features

    • Dial: 100 mm
    • Filling: glycerine filled
    • Entry: 1/2\" bsp rear entry
    • Scale: psi ; bar dual scale
    • Casing: stainless steel
    • Pressure range: 0-1400 psi ( 100 bar )
    • Intended use: visual pressure readout on hydraulic circuits
    Regular price £21.61
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  • Hydra Part 3/4" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £270.25
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    3/4" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Function: 3 way pressure compensated with bypass to pressure line
    • Max inlet flow: 120 l/min
    • Max adjusted flow: 100 l/min
    • Max pressure: 350 bar
    • Use: priority flow to circuit ; bypass maintains line pressurised
    Regular price £270.25
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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.