• Out of Stock
    HP-LVDT-DIN Double Pilot Check Valves - Approved Hydraulics Limited
    Regular price From £36.24
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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 £36.24
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  • Hydra Part 100mm Glycerine Hydraulic Pressure Gauge 0-1400 Psi (100 Bar) 1/2" Rear Entry - Approved Hydraulics
    Regular price £22.70
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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 £22.70
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  • Hydra Part CETOP 3 Modular Pilot Operated Check Valve on A & B (Z2DS-6) - Approved Hydraulics
    Regular price £58.38
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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 £58.38
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  • Hydra Part 3/4" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £297.29
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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 £297.29
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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.

  • 3/8" BSPP Double Acting Pilot Check Valve - Approved Hydraulics Limited
    Regular price £23.29
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    1/4 BSPP Double Acting Pilot Check Valve

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/4 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 £23.29
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  • Hydra Part CETOP 5 Double Solenoid Control Valve NG10, A & B to T - P Blocked - Approved Hydraulics
    Regular price From £114.26
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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 £114.26
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  • 3/8 Bonded seal - Approved Hydraulics Limited
    Regular price £0.92
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    3/8 Bonded seal

    Key Features

    • Type: bonded sealing washer
    • Size: per selection
    • Construction: elastomeric sealing element bonded to metal washer
    • Use: high pressure face sealing on parallel threads/ports
    • Benefit: reliable leak-tight joint under vibration
    Regular price £0.92
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  • 1/4" BSP Male to 1/2 BSP Female Pressure Guage Adaptor - Approved Hydraulics Limited
    Regular price £4.80
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    1/4" BSP Male to 1/2 BSP Female Pressure Guage Adaptor

    Key Features

    • Type: pressure gauge adaptor
    • Threads: 1/4 to 1/2 BSP
    • Seat: 60° cone or flat seat depending on gauge port style
    • Material: plated carbon steel for hydraulic service
    • Use: connect panel or test gauges; transmitters or sensors
    Regular price £4.80
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  • Out of Stock
    1/2" BSP Male x 1/2" BSPT Tapered Adaptor - Approved Hydraulics Limited
    Regular price £4.00
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    3/8" BSP Male x 3/8" BSPT Tapered Adaptor

    Key Features

    • Type: parallel-to-taper adaptor for BSP connections
    • Standards: BSPP (ISO 228) to BSPT (ISO 7) depending on ends
    • Threads: 3/8 to 3/8 BSP
    • Sealing: taper thread seals with thread sealant; parallel with washer/bonded seal
    • Use: connect tapered ports to parallel hose/valve fittings
    Regular price £4.00
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  • Steel Square Vertical Hydraulic Tank 123mm (AC) Neck Flange (Vertical & Horizontal) - Approved Hydraulics Limited
    Regular price From £55.12
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    Steel Square Vertical Hydraulic Tank 123mm (AC) Neck Flange (Vertical & Horizontal)

    Key Features

    • Material: steel
    • Neck flange: 123 mm ac
    • Orientation: vertical ; horizontal use
    • Use: reservoir for ac mini power packs
    • Compatibility: 123 mm filler ; breather ; central manifold
    Regular price From £55.12
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  • Scanreco on/off switch - Approved Hydraulics Limited
    Regular price £39.56
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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 £39.56
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  • Out of Stock
    Protective Black Frame For Radio Remote Control Mini Transmitter Scanreco RC400 - Approved Hydraulics Limited
    Regular price £229.03
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    Protective Black Frame For Radio Remote Control Mini Transmitter Scanreco RC400

    Key Features

    • Type: protective black frame for mini transmitter
    • Compatibility: rc400 g2b mini housing
    • Protection: impact and abrasion shield for transmitter edges
    • Access: leaves display ; buttons and e stop unobstructed
    • Use: maintain durability in harsh mobile environments
    Regular price £229.03
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  • 24v Coil for MOD09 Hydraulic Actuator - Approved Hydraulics Limited
    Regular price £67.61
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    24v Coil for MOD09 Hydraulic Actuator

    Key Features

    • Type: proportional coil for MOD09 hydraulic actuator
    • Supply: 24 vdc
    • Fit: 19 mm bore ; 50 mm length core tube
    • Connector: DIN 43650 interface
    • Use: drive proportional servo module operation
    Regular price £67.61
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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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  • 24V DC Coil-22W-13mm hole-39mm long for  45 - 50L - 80L-90L-100L-150L Unloader Valve - Approved Hydraulics Limited
    Regular price £26.11
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    24V DC Coil-22W-13mm hole-39mm long for 45 - 50L - 80L-90L-100L-150L Unloader Valve

    Key Features

    • Voltage: 24 vdc
    • Power: 22 w
    • Bore: 13 mm through-hole
    • Body length: 39 mm
    • Duty: 100% ed
    • Use: unloader valve actuation
    Regular price £26.11
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  • Out of Stock
    Electrical plug for 12/24VDC coils EP3/4 kits - Approved Hydraulics Limited
    Regular price £1.49
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    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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  • Out of Stock
    3/4" BSP Return Filter Housing
    Regular price £24.18
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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 £24.18
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  • CETOP 5 Coil  - 12VDC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £28.50
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    CETOP 5 Coil - 12VDC, (31mm Bore x 75mm long)

    Key Features

    • Part number: HP-31-75-COIL-12VDC
    • Valve standard: CETOP 5 / NG10 solenoid coil for directional control valves
    • Supply voltage: 12 VDC
    • Coil bore: 31 mm armature tube bore
    • Coil length: 75 mm overall length
    • Electrical connection: Typically via DIN 43650 / EN 175301-803 plug
    • Function: Energises solenoid valve to shift spool for flow direction control
    • Typical use: Mobile hydraulics; manifolds; power packs
    Regular price £28.50
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  • Out of Stock
    Rotary Shaft seal 17x30x7 R23 High Pressure - Approved Hydraulics Limited
    Regular price £5.94
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    Rotary Shaft seal 17x30x7 R23 High Pressure

    Key Features

    • Size: 17 x 30 x 7 mm
    • Profile: R23 (double lip with dust lip)
    • Rating: high pressure capable (application dependent)
    • Material: oil-resistant elastomer with spring energised lip
    • Use: hydraulic pumps; motors; gearboxes (rotating shafts)
    Regular price £5.94
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  • M5 x 140 Cap head bolt - Approved Hydraulics Limited
    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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  • 6 Button On/Off Radio Remote System 12-24VDC prewired 2.4 Mt Cable - Approved Hydraulics Limited
    Regular price £434.99
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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 £434.99
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  • 80L-100L-150L Control Valve  3/8" Tapered Grub Screw For Carry-over Facility - Approved Hydraulics Limited
    Regular price £2.02
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    80L-100L-150L Control Valve 3/8" Tapered Grub Screw For Carry-over Facility

    Key Features

    • Part: tapered grub screw for carry over facility
    • Thread: 3/8"
    • Compatibility: 80l ; 100l ; 150l valve families
    • Purpose: secures or blanks internal carry over drilling
    • Use: fitted during conversion to power beyond or closed centre
    Regular price £2.02
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  • Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports) - Approved Hydraulics Limited
    Regular price £97.98
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    Group 2 Hydraulic Gear Pumps with 1:8 Taper Shaft (Threaded Ports)

    Key Features

    • Pump group: Group 2 external gear pump
    • Body: Aluminium body with cast iron end plates
    • Shaft: 1/8 taper keyed
    • Flange: 4 bolt European mount
    • Ports: Inlet 1/2 inch BSPP ; outlet 3/8 inch BSPP typical
    • Displacement range: ≈4 to 30 cc/rev options
    • Continuous pressure: Up to ~250 bar depending on size
    Regular price £97.98
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Shop All Components for Professional Hydraulic Applications

Discover quality shop all components 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 control valves, line mounted valves 1, hydraulic cylinders, hydraulic pumps 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.