• CARRY OVER PLUG For AK 50 Control Valve - Approved Hydraulics Limited
    Regular price £8.86
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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 £8.86
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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise - Approved Hydraulics Limited
    Regular price £372.30
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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 £372.30
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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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  • 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.

  • 32mm B Shaft For MP &  MR Motors (ZHE) - Approved Hydraulics Limited
    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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  • Springs for PRC 80 Relief Valve 130-350 bar
    Regular price £3.06
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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 £3.06
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  • 3/8" Hose Burst Valve in a Male - Female Housing - Approved Hydraulics Limited
    Regular price £13.96
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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 £13.96
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  • 90° UNIDIRECTIONAL FLOW REGULATOR 3/8" BSP - Pressure Compensated
    Regular price £60.74
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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 £60.74
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  • 3/8" Hose Burst Valve in a Female - Female Housing
    Regular price £15.89
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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 £15.89
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  • 25mm Straight Keyed Shaft For MP & MR Motors (ZHE) - Approved Hydraulics Limited
    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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  • 1" Straight Keyed Shaft For MP And MR Motors (ZHE) - Approved Hydraulics Limited
    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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  • 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 £27.40
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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 £27.40
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  • 1" Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
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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 £38.16
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  • Intermercato seal kit for RX 120-390 rotator - Approved Hydraulics Limited
    Regular price £130.07
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    Intermercato seal kit for RX 120-390 rotator

    Key Features

    • Type: OEM rotator seal kit
    • Compatibility: model stated in title
    • Contents: rod seals ; piston seals ; O rings ; wear rings
    • Media: mineral hydraulic oil service
    • Use: restore leak tightness and rotational performance
    Regular price £130.07
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  • Complete Cylinder for Intermercato GRX15 Grab- Part book item No.8
    Regular price £625.26
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    Complete Cylinder for Intermercato GRX15 Grab- Part book item No.8

    Key Features

    • Type: complete double acting hydraulic cylinder assembly
    • Compatibility: factory replacement for listed TG or GRX models
    • Seals: high pressure rod and piston seals with wiper installed
    • Ports: BSPP per OEM specification
    • Testing: pressure tested for leakage and function
    • Use: restores lifting and clamping performance
    Regular price £625.26
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  • Normall closed prop. flow control in 2 port 3/8" body -24VDC - Approved Hydraulics Limited
    Regular price £205.26
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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 £205.26
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  • Euro Plug 2 Pin To Uk 3 Pin Plug Adapter
    Regular price £9.96
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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 £9.96
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  • 3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps
    Regular price £72.67
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    3/8" Dual Cross Line Relief Valve (V0440/180) 35 lpm - 100-180 Bar - With Protection Caps

    Key Features

    • Thread size: G 3/8 BSPP
    • Setting range: 10 to 180 bar adjustable
    • Max flow: 35 l.min ; 45 l.min variants
    • Max pressure: 350 bar
    • Construction: zinc plated steel body ; hardened internal parts
    • Seals: NBR Buna N standard
    • Function: dual cross line relief with crossed tank
    • Typical use: motor or cylinder shock protection with independent port settings
    Regular price £72.67
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  • Proximity Switch
    Regular price £159.62
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    Proximity Switch

    Key Features

    • Body style: M18 threaded barrel flush mount
    • Sensing range: 8 mm nominal
    • Supply voltage: 10 to 30 vdc
    • Output options: 2 wire dc ; PNP ; NPN ; NO ; NC variants
    • Ingress protection: IP65 ; IP66 ; IP67 ; IP68 ; IP69K
    • Switching frequency: 400 Hz typical
    • Operating temperature: -40 to +85 degC
    • Connection: M12 A coded connector ; 2 m PUR cable variants
    • Standard: IEC 60947-5-2 inductive proximity
    Regular price £159.62
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  • Oil Filter Element - FRD17 - 93mm - 25µm
    Regular price £19.46
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    Oil Filter Element - FRD17 - 93mm - 25µm

    Key Features

    • Series: FRD17 replacement element
    • Diameter: 93 mm nominal element OD
    • Filtration rating: 25 µm nominal media grade
    • Intended use: particulate removal in hydraulic oil to protect components
    • Applications: return ; suction or low pressure filter housings sized for FRD17 elements
    • Service note: monitor differential pressure and change when indicator shows restriction
    Regular price £19.46
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  • 3/8" BSP steel body for A2 cartridge valve
    Regular price £28.04
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    3/8" BSP steel body for A2 cartridge valve

    Key Features

    • Thread: 3/8" BSPP ports
    • Material: steel body for robustness
    • Interface: accepts A2 size screw-in cartridge valve
    • Use: manifold body for line-mounted control functions
    • Service: suitable for industrial hydraulic circuits
    Regular price £28.04
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  • CABLE FOR MEC.OPERATION 3,0M WITH LEVER
    Regular price £136.88
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    CABLE FOR MEC.OPERATION 3,0M WITH LEVER

    Key Features

    • Type: mechanical cable operation kit
    • Length: 3.0 m
    • Includes: lever ; cable ; mounting hardware
    • Use: operate pto or valve from cab
    • Application: hydraulic system component
    Regular price £136.88
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Newly Added Products for Professional Hydraulic Applications

Discover quality newly added products 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. Whether you are replacing existing parts or specifying components for a new build, our experienced team can help you find the right product. 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.