• BSPP One Way Flow Control Valves - Approved Hydraulics Limited
    Regular price From £19.97
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    BSPP One Way Flow Control Valves

    Key Features

    • Type: one-way flow control (throttle/check)
    • Ports: as specified
    • Function: free flow one direction; metered flow opposite via needle
    • Body: barrel pattern for in-line mounting
    • Use: control extend or retract speed on cylinders
    Regular price From £19.97
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  • 3/8 BSPP CETOP 3 Single Manifold - 50 L/Min - 70/350 Bar - Aluminium Body
    Regular price £43.01
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    3/8 BSPP CETOP 3 Single Manifold - 50 L/Min - 70/350 Bar - Aluminium Body

    Key Features

    • Type: single subplate manifold for CETOP 3 (NG6) valves
    • Ports: 3/8 BSPP
    • Max flow: 50 L/min
    • Pressure rating: 70–350 bar
    • Body: aluminium body
    • Use: mount a single directional valve with side ports
    Regular price £43.01
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  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, All Ports Open - Approved Hydraulics
    Regular price From £101.87
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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 £101.87
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  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked - Approved Hydraulics
    Regular price From £108.82
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    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 £108.82
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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.

  • Out of Stock
    Scanreco on/off switch
    Regular price £37.68
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    Scanreco on/off switch

    Key Features

    • Type: on off panel switch for transmitter
    • Action: latching two position
    • Mounting: panel cut out with nut and gasket
    • Rating: 12 ; 24 vdc control circuits
    • Use: power switching for rc400 units
    Regular price £37.68
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  • Filler Breather - Approved Hydraulics Limited
    Regular price £39.66
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    Filler Breather

    Key Features

    • Function: vent ; filter air for hydraulic reservoir
    • Interface: flange mount options ; e.g. 83 mm 6 hole pattern
    • Element: replaceable breather element
    • Use: prevents contamination ; equalises tank pressure
    • Application: hydraulic component
    Regular price £39.66
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  • 90L Monoblock 2 Bank With 1 D/A Spool And 1 Float Spool - Approved Hydraulics Limited
    Regular price £136.22
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    90L Monoblock 2 Bank With 1 D/A Spool And 1 Float Spool

    Key Features

    • Bank count: 2 bank monoblock body
    • Spool set: 1 double acting ; 1 float spool
    • Flow rating: 90 l/min class
    • Control: manual lever operation
    • Feature: float position for implement follow over ground contours
    • Options: power beyond ; cable control kits
    • Applications: loader raise ; lower ; tilt or auxiliary circuits
    Regular price £136.22
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  • Out of Stock
    3/4" BSP Return Filter Housing
    Regular price £19.98
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    3/4" BSP Return Filter Housing

    Key Features

    • Port: 3/4" bspp return
    • Function: return filter head/housing
    • Use: tank top filtration assembly
    • Element: 25 µm compatible
    • Application: hydraulic system component
    Regular price £19.98
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  • 127mm 2 bolt level gauge with temp M12 - Approved Hydraulics Limited
    Regular price £25.91
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    127mm 2 bolt level gauge with temp M12

    Key Features

    • Part number: LVA20TAPM12S01
    • Gauge length: 127 mm
    • Mounting: 2 bolt level gauge for tank side mounting
    • Temperature port: M12 temperature sensor interface
    • Function: Visual oil level indication plus temperature monitoring
    • Typical use: Hydraulic reservoirs; gearboxes; power pack tanks
    Regular price £25.91
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  • M5 x 130 Cap head bolt
    Regular price £3.66
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    M5 x 130 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 130 mm
    • Drive: internal hex for controlled tightening
    • Use: hydraulic brackets; manifolds; guards
    Regular price £3.66
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  • M5 x 140 Cap head bolt
    Regular price £3.90
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    M5 x 140 Cap head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: M5 (metric)
    • Length: 140 mm
    • Drive: internal hex for accurate tightening
    • Use: manifolds; brackets; pump/motor accessories
    Regular price £3.90
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  • CETOP 3 Coil – 220VAC-50HZ  (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    CETOP 3 Coil – 220VAC-50HZ (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with correct DIN plug
    • Notes: ensure AC coil ; armature pairing per manufacturer
    Regular price £13.13
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  • 6 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable
    Regular price £402.76
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    6 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable

    Key Features

    • Functions: 6 on ; off channels for multi function control
    • Supply: 12 ; 24 VDC receiver input
    • Harness: prewired 2.4 m cable simplifies installation
    • Use case: control of up to three double acting valve sections
    • Applications: service bodies ; cranes ; small plant
    • Operating concept: non proportional on ; off commands for clear operator feedback
    Regular price £402.76
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  • Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 180mm Long - Black Plastic Handle
    Regular price £5.99
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    Hand lever 45L -80L-90L-100L-120L-150L-240L M10 Thread x 180mm Long - Black Plastic Handle

    Key Features

    • Lever thread: M10
    • Overall length: 180 mm
    • Compatibility: 45L ; 80L ; 90L ; 100L ; 120L ; 150L ; 240L valves
    • Use: manual actuation of lever boxes
    • Compatibility: Hydra Part GS family ; alternative to Walvoil SD series in same size
    Regular price £5.99
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  • 3/4" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £20.44
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    3/4" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 3/4"
    • Mounting: 3 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £20.44
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  • 3/4" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £16.57
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    3/4" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 3/4"
    • Mounting: 4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £16.57
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  • Hydra Part FLOW DIVIDER/COMBINER 0 In line 3/8" BSP in/out 13-23 lpm - Approved Hydraulics
    Regular price £117.16
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    FLOW DIVIDER/COMBINER 50/50 In line 3/8" BSP In/Out - 24-38 LPM

    Key Features

    • Type: flow divider combiner valve
    • Ports: 3/8" bsp
    • Range: 24 to 38 lpm
    • Function: splits inlet into controlled flows and recombines in reverse
    • Use: share pump flow ; synchronize circuits
    Regular price £117.16
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  • Out of Stock
    Hydra Part 1/2"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar - Approved Hydraulics
    Regular price £116.65
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    1/2"BSP Dual Cross-over 80Lpm Relief Valves

    Key Features

    • Type: dual cross line relief valve
    • Port size: 1/2"bsp
    • Rated flow: 80 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 £116.65
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  • Hydra Part CETOP 5 Modular Flow Control Valve on A&B (Z2FDS-10-30-S) - Approved Hydraulics
    Regular price £73.63
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    CETOP 5 Modular Flow Control Valve on A&B (Z2FDS-10-30-S)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: double throttle ; check meter-in or meter-out on a ; b
    • Max operating pressure: 315 bar
    • Max flow: 160 lpm
    • Temperature: -30 c to +80 c
    Regular price £73.63
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  • Hydra Part CETOP 3 Modular Pilot Operated Check Valve on A & B (Z2DS-6) - Approved Hydraulics
    Regular price £55.60
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    CETOP 3 Modular Pilot Operated Check Valve on A & B (Z2DS-6)

    Key Features

    • Valve type: Pilot operated check valve modular sandwich; locks A and B work ports
    • Interface: CETOP 3 / NG6; ISO 4401-03-02-0-94; DIN 24340-A6
    • Max operating pressure: 315 bar on P; A; B ports; 160 bar on T port
    • Max flow: 60 L/min
    • Pilot ratio: 3/1
    • Construction: Steel body; phosphate coated surface
    • Seal options: NBR; FKM/Viton options
    • Temperature range: -30 to +80 °C (NBR); -20 to +120 °C (FKM/Viton)
    • Fluid compatibility: Mineral oils HM/HV; viscosity 20-400 mm²/s; recommended 30-80 mm²/s
    • Cleanliness: Recommended ISO 4406 class 21/18/15 (1999)
    Regular price £55.60
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  • Hydra Part SV35 Sequence Valve 3/8"BSP - 35Lpm - 100-350 Bar - Approved Hydraulics
    Regular price £59.16
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    SV35 Sequence Valve 3/8"BSP - 35Lpm - 100-350 Bar

    Key Features

    • Port size: 3/8\" bsp
    • Max flow: 35 lpm
    • Pressure ranges: 10-70 ; 20-210 ; 70-350 bar
    • Function: inline sequence valve to control actuator order
    • Adjustment: hand knob ; tamper proof cap options
    Regular price £59.16
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  • Hydra Part Poppet Check Valve 3/4" 130Lpm, 300 Bar Max Pressure - Approved Hydraulics
    Regular price £20.89
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    Poppet Check Valve 3/4" 130Lpm, 300 Bar Max Pressure

    Key Features

    • Type: inline poppet check valve
    • Port size: 3/4' bsp
    • Max flow: 130 l/min
    • Max pressure: 300 bar
    • Cracking pressure: 0.5 bar typical
    • Function: permits flow one way ; blocks reverse
    Regular price £20.89
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  • Out of Stock
    3/8" BSPP Double Acting Pilot Check Valve - Approved Hydraulics Limited
    Regular price £21.17
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    3/8" BSPP Double Acting Pilot Check Valve

    Key Features

    • Type: double acting pilot operated check valve
    • Ports: 3/8 BSPP
    • Function: locks actuator in both directions until pilot pressure opens
    • Benefit: load holding with controlled release
    • Use: cylinders that must hold position under load
    Regular price £21.17
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  • Coil for Solenoid Valve 22W 24vDC - Approved Hydraulics Limited
    Regular price £9.16
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    Coil for Solenoid Valve 22W 12vDC

    Key Features

    • Type: wet-armature solenoid coil for hydraulic valves
    • Power: 22 W
    • Voltage: 12 V DC
    • Connector: DIN 43650-A plug compatible
    • Protection: IP65 with mated connector
    • Duty cycle: continuous service
    Regular price £9.16
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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.