• CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.13
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    CETOP 3 Coil - 12VDC, (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 12 VDC
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A or AMP Jr versions depending on brand
    • Protection: IP65 with suitable connector
    • Power class: typically ~20–29 W DC coils for NG6
    Regular price £13.13
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  • CETOP 5 Coil  - 220VAC, (31mm Bore x 75mm long)
    Regular price £24.73
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    CETOP 5 Coil - 220VAC, (31mm Bore x 75mm long)

    Key Features

    • Valve size: CETOP 5 ; ISO 4401-05
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 31 mm bore ; 75 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with proper DIN plug
    • Notes: match coil ; armature to valve make
    Regular price £24.73
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  • CETOP 5 Coil  - 110VAC, (31mm Bore x 75mm long) - Approved Hydraulics Limited
    Regular price £24.73
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    CETOP 5 Coil - 110VAC, (31mm Bore x 75mm long)

    Key Features

    • Valve size: CETOP 5 ; ISO 4401-05
    • Voltage: 110 VAC 50.60 Hz
    • Core ; length: Ø 31 mm bore ; 75 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with proper DIN plug
    • Duty: continuous service ; wet armature compatible
    Regular price £24.73
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  • Din Connector plug 3 Pole + Earth - IP65 - Max 240 VAC - 10A - Approved Hydraulics Limited
    Regular price £3.19
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    Din Connector plug 3 Pole + Earth - IP65 - Max 240 VAC - 10A

    Key Features

    • Standard: DIN 43650 Form A ; ISO 4400
    • Contacts: 3 pole + earth PE
    • Rating: 250 VAC ; 10 A max
    • Ingress protection: IP65 with gasket ; strain relief
    • Use: fits solenoid coils with 18 mm pin spacing ; DIN Form A
    Regular price £3.19
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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.

  • HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve
    Regular price £28.21
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    HP-50 Kit-Complete Wet Spool Lever Cap For HP50 Control Valve

    Key Features

    • Compatibility: HP50 monoblock control valve sections
    • Assembly: complete wet spool lever cap with lever hardware
    • Rated flow of valve: 50 l.min HP50 valve family
    • Seal type: wet armature design with O ring sealing
    • Use: service kit to replace damaged cap ; restores manual actuation
    Regular price £28.21
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  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £38.65
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    1 1/2 BSPm x 1 1/2 BSPm

    Key Features

    • Type: inline adaptor male to male
    • Threads: 1 1/2 BSP to 1 1/2 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or extend fittings
    Regular price £38.65
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  • placeholder
    Regular price £18.25
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    3/4 bspm x 1" bspf adaptor

    Key Features

    • Type: fixed male to female inline adaptor
    • Threads: 3/4 BSP male to 1 BSP female
    • Standard: BSPP parallel per ISO 228
    • Material: plated carbon steel
    • Use: reduce/enlarge port connection without swivel
    Regular price £18.25
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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 £277.56
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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 £277.56
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  • Banjo Tubes - Approved Hydraulics Limited
    Regular price £12.06
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    1/2" Banjo Body To 15mm Tube x 100mm Long

    Key Features

    • Interface: banjo ring for 1/2" banjo bolt
    • Tube end: 15 mm OD tube to suit 15L DIN 2353 compression fittings
    • Overall length: 100 mm tube length
    • Working pressure: up to 350 bar typical for steel banjo tubes
    • Material: zinc plated steel body and tube
    • Use: mount cylinders or valves where compact banjo connection is needed
    Regular price £12.06
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  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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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 £38.16
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  • 32mm B Shaft For MP &  MR Motors (ZHE)
    Regular price £28.18
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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 £28.18
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  • M5 x 120 Cap Head bolt
    Regular price £2.22
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    M5 x 120 Cap Head bolt

    Key Features

    • Fastener type: socket cap screw
    • Thread: metric M5
    • Length: 120 mm
    • Drive: internal hex (Allen)
    • Use: hydraulic brackets; manifolds; general assemblies
    Regular price £2.22
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  • Springs for PRC 80 Relief Valve 130-350 bar
    Regular price £2.77
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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 £2.77
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  • 3/8" Hose Burst Valve in a Male - Female Housing
    Regular price £12.68
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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 £12.68
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  • 3/8" 3 Way Adjustable Priority Flow Control Valve  - Excess to Line.
    Regular price £97.69
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    3/8" 3 Way Adjustable Priority Flow Control Valve - Excess to Line.

    Key Features

    • Ports: G 3/8 BSPP
    • Function: 3 way pressure compensated priority flow control
    • Max inlet flow: 60 l.min
    • Max outlet C flow: 35 l.min
    • Max pressure: 270 bar
    • Body: aluminium body ; hardened steel internals
    • Use: set constant actuator flow with excess to tank or secondary circuit
    Regular price £97.69
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  • 90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated
    Regular price £55.21
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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 £55.21
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    • Order by 3pm for Next Day Delivery
  • Single Counter Balance / Overcentre Valve 3/8" IN LINE Ally Body 100 - 350 bar 4.2:1 Ratio - Approved Hydraulics Limited
    Regular price £91.43
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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 £91.43
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  • 3/8" Hose Burst Valve in a Female - Female Housing
    Regular price £14.44
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    3/8" Hose Burst Valve in a Female - Female Housing

    Key Features

    • Ports: G 3/8 BSPP female x female
    • Function: flow operated hose burst safety shut off
    • Max flow: 50 l.min typical
    • Max pressure: 350 bar
    • Body: zinc plated steel ; low leakage design
    • Options: orifice in disc for emergency lowering on request
    • Mounting: install at cylinder port ; use downstream flow regulator to control lowering
    Regular price £14.44
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  • 25mm Straight Keyed Shaft For MP & MR Motors (ZHE)
    Regular price £32.44
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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 £32.44
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    • Order by 3pm for Next Day Delivery
  • 1" Straight Keyed Shaft For MP And MR Motors (ZHE)
    Regular price £28.18
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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 £28.18
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    • Order by 3pm for Next Day Delivery
  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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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 £38.16
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  • 6 Splined SAE "B" Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    Regular price £32.44
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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 £32.44
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  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £23.82
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    MR motor seal kit (ZI)

    Key Features

    • Compatibility: M+S MR series orbital motors series 3 ; series 4
    • Shaft seal: 28.56 x 42 x 5.5 mm NBR typical
    • Dust seal: 28.5 x 35 x 2 mm
    • O rings: 48 x 2 mm ; 90 x 2 mm x3
    • Purpose: restores sealing to reduce leakage and maintain pressure
    • Use: service kit for MR motor overhaul ; maintenance
    • Notes: check shaft code ZI ; different seals exist for ZH ; ZK variants
    Regular price £23.82
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  • 1" Straight Keyed Shaft For MR Motors (Zi)
    Regular price £38.16
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    • Delivery to UK & Ireland

    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 £38.16
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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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.