• Oil Filter Element - FRD08 - 152mm - 25 µm - Approved Hydraulics Limited
    Regular price £18.15 Ex VAT £21.78 Inc VAT
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    Oil Filter Element - FRD08 - 152mm - 25 µm

    Key Features

    • Part number: CCDEP04
    • Element type: Hydraulic oil filter element replacement
    • Filtration rating: 25 µm
    • Dimensions: 70 mm OD; 28 mm ID; 130 mm height
    • Filter media: UFI.CELL filter media
    • Weight: 0.25 kg
    • Cross references: Sofima CRE025CV1; UFI ERA32NCD
    • Typical use: Oil filtration in hydraulic circuits to protect pumps and valves
    Regular price £18.15 Ex VAT £21.78 Inc VAT
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  • Return Air Filter - 235mm - 25 µm
    Regular price £67.55 Ex VAT £81.07 Inc VAT
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    Return Air Filter - 235mm - 25 µm

    Key Features

    • Part number: FRD09
    • Filter type: Return line filter for hydraulic oil systems
    • Filtration rating: 25 µm mesh
    • Height: 235 mm
    • Connection: 1 in BSP
    • Max working pressure: 3 bar
    • Bypass valve: 1.7 bar ±10 percent
    • Materials: Head and cover aluminium; bowl polyamide
    Regular price £67.55 Ex VAT £81.07 Inc VAT
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  • 1/2" Cylinder Breather
    Regular price £14.85 Ex VAT £17.82 Inc VAT
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    1/2" Cylinder Breather

    Key Features

    • Thread: 1/2" NPT
    • Function: vents cylinder while filtering intake air
    • Benefit: balances pressure; reduces moisture and dust ingress
    • Element: integrated breather element (high-flow)
    • Use: hydraulic cylinders; small reservoirs
    Regular price £14.85 Ex VAT £17.82 Inc VAT
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  • Single Acting Spool On 'A' Port for AK50 Control Valve - Approved Hydraulics Limited
    Regular price £12.65 Ex VAT £15.19 Inc VAT
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    Single Acting Spool On 'A' Port for AK50 Control Valve

    Key Features

    • Spool type: single acting on A port with check on B
    • Neutral: spring centered ; blocked work port in neutral
    • Function: metered raise on A ; gravity return via check
    • Application: SA cylinders ; tipper ; clamps
    • Specification: see product datasheet
    Regular price £12.65 Ex VAT £15.19 Inc VAT
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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.

  • D/A spool for 50L AK electric op valve - Approved Hydraulics Limited
    Regular price £13.70 Ex VAT £16.45 Inc VAT
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    D/A spool for 50L AK electric op valve

    Key Features

    • Spool type: double acting cylinder spool for AK 50 valve
    • Neutral: spring centered ; P to T open centre ; A.B blocked options by build
    • Work ports: metered control A ; B in both directions
    • Use: operate DA cylinders ; lift ; tilt functions
    • Notes: confirm spool code against valve plate for symbol matching
    Regular price £13.70 Ex VAT £16.45 Inc VAT
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  • CARRY OVER PLUG For AK 50 Control Valve - Approved Hydraulics Limited
    Regular price £7.38 Ex VAT £8.86 Inc VAT
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    CARRY OVER PLUG For AK 50 Control Valve

    Key Features

    • Function: power beyond sleeve ; isolates P from T in outlet section
    • Valve family: AK 50 sectional control valves
    • Porting: provides high pressure carry over to downstream valve
    • Installation: fit in outlet body ; tank line must remain to T1.T2
    • Use: extend circuits ; add additional valve stack safely
    Regular price £7.38 Ex VAT £8.86 Inc VAT
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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise - Approved Hydraulics Limited
    Regular price £310.25 Ex VAT £372.30 Inc VAT
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    Clockwise Group 2 Tandem Pump 14cc Front + 14cc Rear 1:8 taper shaft with Flange Ports

    Key Features

    • Sections: tandem two stage ; 14 cc front ; 14 cc rear
    • Rotation: clockwise
    • Ports: typical suction 3/4" BSP ; pressure 1/2" BSP per stage
    • Shaft: 1.8 taper ; 4 bolt EU flange
    • Working pressures: P1 up to 200 bar ; P2 up to 160 bar
    • Speed: up to ~3500 rpm
    • Use: dual circuit mobile hydraulics ; steering ; implements
    Regular price £310.25 Ex VAT £372.30 Inc VAT
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  • GP40 87cc Group 4 Gear Pump ISO With Rear + Side Ports - Bi-Directional With 250 Bar Continuous Operating Pressure
    Regular price £268.00 Ex VAT £321.60 Inc VAT
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    GP40 87cc Group 4 Gear Pump ISO With Rear + Side Ports - Bi-Directional With 250 Bar Continuous Operating Pressure

    Key Features

    • Displacement: 87 cm3.rev (Group 4)
    • Ports: rear and side inlet ; ISO pattern
    • Rotation: bi directional build available
    • Continuous pressure: ~220–250 bar class depending on model
    • Speed range: up to ~1700–3000 rpm model dependent
    • Mounting: PTO friendly ; ISO 4 bolt flange
    • Typical use: truck PTO hydraulics ; tippers ; winches
    Regular price £268.00 Ex VAT £321.60 Inc VAT
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  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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    32mm B Shaft For MR Motors (Zi)

    Key Features

    • Interface: 32 mm B shaft profile for MR motors
    • Compatibility: MR series motor shaft conversion
    • Keyway: parallel key drive (B type)
    • Use: adapts motor to larger bore couplings and hubs
    • Material: alloy steel; precision ground
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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  • 32mm B Shaft For MP &  MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £23.48 Ex VAT £28.18 Inc VAT
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    32mm B Shaft For MP & MR Motors (ZHE)

    Key Features

    • Shaft type: Ø 32 mm parallel keyed output for MP ; MR motors
    • Key standard: DIN 6885 ; ISO R773
    • Key size: 10 x 8 mm typical for 30–38 mm shafts
    • Compatibility: fits M+S MP ; MR families with CB shaft codes
    • Use: service replacement shaft ; verify seal ; bearing diameters
    • Applications: general LSHT drives; conveyors; augers
    Regular price £23.48 Ex VAT £28.18 Inc VAT
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  • Springs for PRC 80 Relief Valve 130-350 bar
    Regular price £2.55 Ex VAT £3.06 Inc VAT
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    Springs for PRC 80 Relief Valve 130-350 bar

    Key Features

    • Valve family: OFC PRC 80 pressure relief cartridge ; M26x1.5
    • Spring code: 30 set range 130–350 bar for PRC80
    • Alt ranges: 10 5–50 bar ; 20 30–260 bar options
    • Rated flow: 80 l.min cartridge capacity
    • Max working pressure: 350 bar
    • Adjustment styles: socket screw A ; handknob B ; tamperproof cap C
    • Materials: zinc plated steel cartridge ; hardened internals
    Regular price £2.55 Ex VAT £3.06 Inc VAT
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  • 3/8" Hose Burst Valve in a Male - Female Housing - Approved Hydraulics Limited
    Regular price £11.63 Ex VAT £13.96 Inc VAT
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    3/8" Hose Burst Valve in a Male - Female Housing

    Key Features

    • Ports: G 3/8 BSPP male x female
    • Function: flow actuated hose burst safety valve
    • Max flow: 45 l.min typical
    • Max pressure: 350 bar
    • Body: zinc plated steel ; compact inline
    • Notes: install close to actuator port for best protection
    Regular price £11.63 Ex VAT £13.96 Inc VAT
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  • 90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated
    Regular price £50.61 Ex VAT £60.74 Inc VAT
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    90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated

    Key Features

    • Ports: G 3/8 BSPP
    • Function: 90 deg elbow flow regulator with check valve
    • Compensation: pressure compensated A->B ; free reverse via check
    • Max flow A->B: 30 l.min typical at 3/8 size
    • Max pressure: 250 bar
    • Body: zinc plated steel ; alloy handknob
    • Applications: speed control of cylinder or motor in one direction
    Regular price £50.61 Ex VAT £60.74 Inc VAT
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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 £83.80 Ex VAT £100.57 Inc VAT
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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 £83.80 Ex VAT £100.57 Inc VAT
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  • 25mm Straight Keyed Shaft For MP & MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £27.03 Ex VAT £32.44 Inc VAT
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    25mm Straight Keyed Shaft For MP & MR Motors (ZHE)

    Key Features

    • Shaft diameter: 25 mm
    • Key standard: DIN 6885 parallel key
    • Key size: 8 x 7 mm typical for 25 mm shaft
    • Compatibility: M+S MP ; MR orbital motor shaft interface
    • Material: steel ; ground finish on bearing ; seal lands
    • Use: replacement straight keyed shaft ; service part
    Regular price £27.03 Ex VAT £32.44 Inc VAT
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  • 1" Straight Keyed Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £23.48 Ex VAT £28.18 Inc VAT
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    1" Straight Keyed Shaft For MP And MR Motors (ZHE)

    Key Features

    • Shaft diameter: 1.000 in
    • Key standard: ANSI B17.1 parallel key
    • Key size: 1/4 in x 1/4 in typical for 1 in shaft
    • Compatibility: M+S MP ; MR orbital motor shaft interface
    • Use: replacement straight keyed shaft
    • Notes: verify keyway and seal kit against motor series and code
    Regular price £23.48 Ex VAT £28.18 Inc VAT
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  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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    25mm Straight Keyed Shaft For MR Motors (Zi)

    Key Features

    • Interface: 25 mm straight keyed shaft
    • Compatibility: MR series hydraulic motors
    • Keyway: parallel key for positive torque transfer
    • Use: couples motor output to hubs; pulleys; couplings
    • Material: alloy steel for durability
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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  • 6 Splined SAE "B" Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £27.03 Ex VAT £32.44 Inc VAT
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    6 Splined SAE "B" Shaft For MP And MR Motors (ZHE)

    Key Features

    • Spline profile: SAE 6B straight sided 1" 6-tooth per ANSI B92.1 class B
    • Major diameter: 1.000 in nominal for SAE 6B
    • Compatibility: M+S MP ; MR orbital motor shaft option
    • Use: replacement output shaft for LSHT motors
    • Material: steel ; typically hardened at spline flanks
    • Mating hub: SAE 6B internal spline hub
    • Typical applications: drives using 1 in 6B spline couplings ; gearboxes ; hubs
    Regular price £27.03 Ex VAT £32.44 Inc VAT
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  • 1" Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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    1" Straight Keyed Shaft For MR Motors (Zi)

    Key Features

    • Interface: 1" straight keyed shaft
    • Compatibility: MR series hydraulic motors (Zi)
    • Keyway: parallel key for positive torque transfer
    • Retention: snap ring/retainer provision (motor dependent)
    • Material: alloy steel for wear resistance
    • Use: adapts motor to couplings; hubs; pulleys
    Regular price £31.80 Ex VAT £38.16 Inc VAT
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  • MV Hydraulic Motor Mounted Dual Cross Line relief valve 1" Ports - Approved Hydraulics Limited
    Regular price £331.55 Ex VAT £397.86 Inc VAT
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    MV Hydraulic Motor Mounted Dual Cross Line relief valve 1" Ports

    Key Features

    • Mounting: flanged directly to MV ; OMV ; CPMV motor port pattern
    • Port size: 1 in ports on MV variant
    • Setting ranges: 30 to 100 bar ; 50 to 210 bar ; 20 to 250 bar options
    • Max flow: up to 120 l.min
    • Function: dual cross port relief for overpressure ; shock protection
    • Construction: zinc plated steel body ; hardened internal components
    • Seals: NBR Buna N standard
    • Options: anti cavitation check valves available in related families
    Regular price £331.55 Ex VAT £397.86 Inc VAT
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  • Normall closed prop. flow control in 2 port 3/8" body -24VDC - Approved Hydraulics Limited
    Regular price £171.05 Ex VAT £205.26 Inc VAT
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    Normall closed prop. flow control in 2 port 3/8" body -24VDC

    Key Features

    • Function: normally closed proportional flow control
    • Porting options: 2 way restrictive ; 3 way priority versions
    • Pressure rating: 240 bar ; 260 bar ; 350 bar depending on model
    • Nominal flow ranges: 40 l.min ; 57 l.min ; 65 l.min ; 114 l.min options
    • Control: PWM current driven solenoid with dither for linearity
    • Coil voltages: 12 vdc ; 24 vdc
    • Connections: DIN 43650 ; Deutsch ; AMP coil connectors
    • Mounting: screw in cartridge for common cavities 10W ; 12W ; 17A families
    • Typical use: speed control of motors or actuators with pressure compensation
    Regular price £171.05 Ex VAT £205.26 Inc VAT
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  • Euro Plug 2 Pin To Uk 3 Pin Plug Adapter
    Regular price £8.30 Ex VAT £9.96 Inc VAT
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    Euro Plug 2 Pin To Uk 3 Pin Plug Adapter

    Key Features

    • Input plug types: CEE 7/16 Europlug 2 pin ; CEE 7/7 Schuko E.F depending on model
    • Output socket: BS 1363 Type G 3 pin
    • Rating: 13 A 250 Vac
    • Fuse: 13 A BS 1362
    • Standard: BS 8546.2016+A1.2018 travel adaptor specification
    • Safety features: shuttered outlets ; insulated construction
    • Function: adapter only ; no voltage conversion
    • Typical use: power EU equipment from UK mains 230 Vac
    Regular price £8.30 Ex VAT £9.96 Inc VAT
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    Regular price £102.10 Ex VAT £122.53 Inc VAT
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    Cetop 3 E Spool All Ports Blocked 110VAC Coils

    Key Features

    • Valve type: CETOP 3 directional control valve
    • Spool: E spool with all ports blocked in center position
    • Coils: 110 VAC solenoids
    • Mounting pattern: NG6 / ISO 4401-03
    • Function: holds load at center; blocks P; A; B; T
    • Use: industrial hydraulic manifolds and presses
    Regular price £102.10 Ex VAT £122.53 Inc VAT
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  • M18 Dowty Washer - Approved Hydraulics Limited
    Regular price £0.68 Ex VAT £0.82 Inc VAT
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    M18 Dowty Washer

    Key Features

    • Size: M18 metric bonded seal
    • Dimensions: ID 18.7 mm ; OD 26.0 mm ; thickness 1.5 mm
    • Materials: steel ring ; NBR elastomer
    • Alternatives: stainless ring ; FKM ; EPDM options
    • Pressure capability: up to 250 bar standard
    • Temperature range: -30 to +200 degC depending on elastomer
    • Surface finish for sealing: Rmax <= 15 um ; Ra <= 3.2 um recommended
    • Applications: static sealing under bolt heads ; threaded stud ends in hydraulic ports
    Regular price £0.68 Ex VAT £0.82 Inc VAT
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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.