• Hydra Part FLOW DIVIDER/COMBINER IN LINE 3/8" BSP In + OUT 6,5-12 lpm - Approved Hydraulics
    Regular price £150.25
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    FLOW DIVIDER/COMBINER 50/50 In line 3/8" BSP In/Out - 6,5-12 LPM

    Key Features

    • Function: 50 ; 50 flow divider ; combiner
    • Porting: 3/8" bsp
    • Flow range: 6;5-12 lpm
    • Accuracy: maintains equal flows within typical tolerance
    • Use: synchronise two actuators ; recombine return flow
    • Mounting: in line
    Regular price £150.25
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  • Hydra Part FLOW DIVIDER/COMBINER 1/2" in 3/8" Inlet Capy. 24-38 LPM - Approved Hydraulics
    Regular price £117.16
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    FLOW DIVIDER/COMBINER 50/50 1/2" in 3/8"out Inlet Capy. 24-38 LPM

    Key Features

    • Function: 50 ; 50 flow divider ; combiner
    • Porting: 1/2" bsp in ; 3/8" bsp out
    • Flow range: 24-38 lpm
    • Accuracy: maintains equal flows within typical tolerance
    • Use: synchronise two actuators ; recombine return flow
    • Mounting: in line
    Regular price £117.16
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  • Hydra Part Double Counterbalance Valve 3/4" In Line - 100-350Bar (Aluminium Body) - Approved Hydraulics
    Regular price £195.64
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    Double Counter Balance / Overcentre Valve 3/4" IN LINE Ally Body 100 - 350 bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 3/4"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: aluminium body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £195.64
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  • Hydra Part Double Counterbalance Valve 1/2" In Line - 100-350Bar - Approved Hydraulics
    Regular price £151.78
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    Double Counter Balance / Overcentre Valve 1/2" IN LINE 100-350 bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 1/2"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £151.78
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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.

  • Hydra Part Double Counterbalance Valve 3/8" In Line - 100-350Bar - Approved Hydraulics
    Regular price £145.61
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    Double Counterbalance Valve 3/8" In Line - 100-350Bar

    Key Features

    • Type: double counterbalance ; overcentre valve
    • Port size: 3/8"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £145.61
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    • Delivery to UK & Ireland
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  • Hydra Part Single Counterbalance Valve 1/2" In Line - 100-350Bar - Approved Hydraulics
    Regular price £68.89
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    Single Counter Balance / Overcentre Valve 1/2" IN LINE Steel Body 100-350 Bar 4.2:1 Pilot Ratio

    Key Features

    • Type: single counterbalance ; overcentre valve
    • Port size: 1/2"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 4.2 . 1
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £68.89
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    • Order by 3pm for Next Day Delivery
  • Single Counter Balance / Overcentre Valve 3/8" IN LINE Steel Body 100-350 Bar 1:8 Pilot Ratio - Approved Hydraulics Limited
    Regular price £98.94
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    Single Counter Balance / Overcentre Valve 3/8" IN LINE Steel Body 100-350 Bar 1:8 Pilot Ratio

    Key Features

    • Type: single counterbalance ; overcentre valve
    • Port size: 3/8"
    • Adjustment range: 100 to 350 bar
    • Pilot ratio: 1 . 8 ; 4.2 . 1 options
    • Body: steel body
    • Function: load holding ; controlled lowering ; relief overpressure
    • Mounting: in line
    • Typical applications: boom ; stabiliser legs ; winch loads
    Regular price £98.94
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part 3/4"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar - Approved Hydraulics
    Regular price £87.61
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    3/4"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar

    Key Features

    • Type: dual cross line relief valve
    • Port size: 3/4"bsp
    • Rated flow: 80 lpm
    • Adjustment range: 130 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 £87.61
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  • Hydra Part 3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar - Approved Hydraulics
    Regular price £99.42
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    3/8"BSP Dual Cross-over 35Lpm Relief Valve - 100-350Bar

    Key Features

    • Type: dual cross line relief valve
    • Port size: 3/8"bsp
    • Rated flow: 35 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 £99.42
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    • Order by 3pm for Next Day Delivery
  • Hydra Part SV80 Sequence Valve 3/4" Bsp - 80Lpm - 100-350 Bar - Approved Hydraulics
    Regular price £82.38
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    SV80 Sequence Valve 3/4" Bsp - 80Lpm - 100-350 Bar

    Key Features

    • Type: hydraulic sequence valve ; direct acting
    • Port size: 3/4" bsp
    • Rated flow: 80 lpm
    • Pressure setting: 100 to 350 bar
    • Function: opens secondary circuit after set pressure reached
    • Mounting: in line
    • Applications: dual actuator sequencing ; clamp then work
    Regular price £82.38
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  • Hydra Part High Pressure Carry Over for Z50/Z80 Valve - Approved Hydraulics
    Regular price £11.09
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    High Pressure Carry Over for Z50/Z80 Valve

    Key Features

    • Accessory: high pressure carry over ; power beyond sleeve
    • Compatibility: z50 ; z80 monoblock valves
    • Use: enables downstream circuits ; converts open centre to power beyond
    • Installation: fits in end section kit ; see valve data sheet
    • Working pressure: as per base valve rating ; up to 250 bar typical
    • Notes: requires appropriate return to tank path for excess flow
    Regular price £11.09
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  • Hydra Part Inline Pressure Relief Valve 3/4" Bsp 80Lpm 350 Bar Max - Approved Hydraulics
    Regular price From £62.28
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    Inline Pressure Relief Valves 3/4" BSP

    Key Features

    • Port size: 3/4\" bsp
    • Max flow: 80 lpm
    • Pressure range: 100 to 350 bar
    • Function: inline pressure relief ; system overpressure protection
    • Mounting: in line valve body
    Regular price From £62.28
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  • Hydra Part 3/8" 3 Port Pressure Compensating Flow Control with bypass to line - Approved Hydraulics
    Regular price £146.54
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    3/8" 3 Port Pressure Compensating Flow Control with bypass to line

    Key Features

    • Port size: 3/8\" bsp
    • Type: 3 port priority flow control
    • Compensation: pressure compensated priority flow
    • Bypass: excess flow bypass to line
    • Use: maintains set actuator flow under load changes
    Regular price £146.54
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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 5 Pressure Reducing Module - A to T (ZPR-10-D-A-1-210-YM) - Approved Hydraulics
    Regular price £146.60
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    CETOP 5 Pressure Reducing Module - A to T (ZPR-10-D-A-1-210-YM)

    Key Features

    • Interface: iso 4401-05 cetop 5 ng10
    • Function: pressure reducing module a to t
    • Max operating pressure: 315 bar
    • Secondary pressure: 210 bar
    • Max flow: 60 lpm
    • Temperature: -20 c to +80 c
    Regular price £146.60
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  • CETOP 3 Aluminium Manifolds - P & T 1/2" - A & B 3/8" - Approved Hydraulics Limited
    Regular price From £39.59
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    CETOP 3 Aluminium Manifolds - P & T 1/2" - A & B 3/8"

    Key Features

    • Interface: iso 4401-03 cetop 3
    • Ports: p ; t 1/2\" ; a ; b 3/8\"
    • Max flow: 40 lpm
    • Max pressure: 315 bar
    • Type: aluminium manifold ; subplate
    Regular price From £39.59
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  • Z80 1/2" Solenoid Control Valves 80LPM 12/24VDC - Approved Hydraulics Limited
    Regular price From £207.30
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    Z80 1/2" Solenoid Control Valves 80LPM 12/24VDC

    Key Features

    • Port size: 1/2\" bsp
    • Nominal flow: 80 lpm
    • Supply voltage: 12 vdc ; 24 vdc
    • Configuration: direct acting solenoid control ; monoblock
    • Banks: up to 6 sections
    • Carry over: high pressure carry over option
    Regular price From £207.30
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  • Standard 45L Lever Operated Monoblock Valves (3/8"BSP) (1-6 levers) - Approved Hydraulics Limited
    Regular price From £73.39
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    Standard 45L Lever Operated Monoblock Valves (3/8"BSP) (1-6 levers)

    Key Features

    • Ports: 3/8\" bsp p ; a ; b ; t
    • Nominal flow: 45 lpm ; 65 lpm max
    • Max operating pressure: 315 bar
    • Spools: double acting ; spring return to neutral
    • Carry over: hp carry over port optional
    • Banks: 1 to 6 levers
    • Options: single acting ; motor ; float spools ; detents
    Regular price From £73.39
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  • On Sale
    Hydra Part Standard 90L Lever Operated Monoblock Valves (3/4"BSP) - Approved Hydraulics
    Regular price £276.06
    Regular price £391.97 Sale price Saving 29%
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    5 Bank - Standard 90L Lever Operated Monoblock Valves (3/4"BSP)

    Key Features

    • Ports: 3/4\" bsp p ; a ; b ; t
    • Nominal flow: 90 lpm ; 100 lpm max
    • Max operating pressure: 315 bar
    • Spools: double acting ; spring return to neutral
    • Carry over: hp carry over port optional
    • Banks: 1 to 6 levers
    • Options: cable ; joystick ; pneumatic ; electro-hydraulic kits
    Regular price £276.06
    Regular price £391.97 Sale price Saving 29%
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Stabiliser Pad Cages - Approved Hydraulics
    Regular price From £132.92
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    Stabiliser Pad Cages (Premium Quality)

    Key Features

    • Size range: 300 x 300 to 800 x 800 mm pads
    • Capacity: stores 2 stabiliser pads
    • Security: padlock ; chain included
    • Use: stowage for stabiliser pads in transit ; onsite
    • Fitment: sized to match pad dimensions
    Regular price From £132.92
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    • Order by 3pm for Next Day Delivery
  • Hydra Part Side Mounted Steel Oil Tanks With Filter (80L-250L) - Approved Hydraulics
    Regular price From £332.20
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    Side Mounted Steel Oil Tanks With Filter (80L-250L)

    Key Features

    • Capacity options: 80 l to 250 l
    • Material: 2 mm steel ; black painted
    • Includes: return filter 25 micron
    • Return filter: 4 different return filter mounting variations.
    • Mounting: side mounted reservoir
    • Testing: pressure tested tank
    Regular price From £332.20
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  • Hydraulic Motors (MV Series) - Approved Hydraulics Limited
    Regular price From £403.48
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    Hydraulic Motors (MV Series)

    Key Features

    • Series: mv high torque
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    • Features: tapered roller bearings for high radial ; axial loads
    • Displacements: 315 cc to 800 cc
    Regular price From £403.48
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  • Hydra Part Hydraulic Motors (MP Series) - Approved Hydraulics
    Regular price From £149.40
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    Hydraulic Motors (MP Series)

    Key Features

    • Series: mp high torque
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    Regular price From £149.40
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Motors (MM Series) - Approved Hydraulics Limited
    Regular price From £97.08
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    Hydraulic Motors (MM Series)

    Key Features

    • Series: mm compact
    • Design: gerotor ; geroler low speed high torque motor
    • Mounting: industry standard flanges ; shaft options
    • Use: conveyors ; winches ; agricultural ; forestry ; cranes
    • Ports: side ports ; case drain where required
    • Features: shaft distribution flow ; compact volume ; low weight
    Regular price From £97.08
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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.