• 90L Monobloc valve single Acting Detent  (A Blanked)
    Regular price £38.63
    • All Items Guaranteed
    • Delivery to UK & Ireland

    90L Monobloc valve single Acting Detent (A Blanked)

    Key Features

    • Valve platform: 90 l/min monoblock directional valve
    • Spool function: single-acting; a-port blanked
    • Detent: mechanical detent on return stroke
    • Port threads: typically 1/2" bsp p;t;a;b
    • Use: operate single-acting cylinders e.g. tipping
    • Accessories: spring/detent kit 30075376 family
    Regular price £38.63
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 90L  Monobloc valve single Acting Detent (B Blanked)
    Regular price £38.62
    • All Items Guaranteed
    • Delivery to UK & Ireland

    90L Monobloc valve single Acting Detent (B Blanked)

    Key Features

    • Valve: 90L monoblock ; single acting conversion
    • Spool: B side blanked ; spring return kit fitted
    • Use: Single acting service with return to tank via open port
    • Detent: Maintains actuation in required direction
    • Additional info: See product data sheet for detailed measurements
    Regular price £38.62
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £38.29
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Cylinder Seal kit 30-70/80 standard

    Key Features

    • Compatibility: Hydra Part standard double acting cylinders ; bores 30 ; 40 ; 50 ; 60/70 ; 80 mm
    • Intended use: routine reseal kit for compact and mid size standard cylinders
    • Typical kit contents: dynamic piston and rod seals ; wiper and static sealing elements typical for rebuild
    • Applications: compact machinery ; auxiliary rams ; attachments
    • Fitment check: verify bore and rod combo to select the correct sub option within the range
    • Service note: install with clean fluid and avoid sharp edges to protect sealing lips
    Regular price £38.29
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 5L Steel Hydraulic Tank 123mm (AC) Neck Flange - Approved Hydraulics Limited
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland

    5L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 5 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 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.

  • 5L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland

    5L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 5 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1" Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
    • All Items Guaranteed
    • 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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 25mm Straight Keyed Shaft For MR Motors (Zi) - Approved Hydraulics Limited
    Regular price £38.16
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position
    Regular price £37.86
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L-90L-100L-120L-150L control valve Detent Kit 10B Detent In B Position

    Key Features

    • Function: Detent in B position ; positions 0 and A spring centered
    • Kit code: 10B
    • Compatibility: 80L ; 90L ; 100L ; 120L ; 150L control valves
    • Use: Hold spool at full B
    • Additional info: See product data sheet for detailed measurements
    Regular price £37.86
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £37.60
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Seal Kit For Hydra Part MT Motor (Zi)

    Key Features

    • Compatibility: Hydra Part MT orbital motors ; Zi pattern
    • Intended use: renew shaft ; cover and case seals to correct oil leaks and pressure loss
    • Typical kit contents: output shaft seal ; body o rings ; port and drain seals used on MT motors
    • Applications: low speed high torque drives on conveyors ; wheel motors ; winches
    • Service note: inspect shaft for wear ; replace if grooved to protect new seal
    • Fitment check: confirm MT model code and mounting to select correct kit
    Regular price £37.60
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 240L TIE ROD KIT (4 Rods / kit) 3 Bank M12x1.75  361 mm long
    Regular price £37.38
    • All Items Guaranteed
    • Delivery to UK & Ireland

    240L TIE ROD KIT (4 Rods / kit) 3 Bank M12x1.75 361 mm long

    Key Features

    • Valve family: 240l sectional valve
    • Configuration: 3 bank
    • Rods per kit: 4
    • Thread: m12x1.75
    • Rod length: 361 mm
    • Application: clamp sectional valve stack ; maintain alignment under load
    • Compatibility: tie rod bores in 240l family
    • Variants: 1 ; 2 ; 3 bank options
    Regular price £37.38
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 150L Control Valve  4 Position Detent Kit For 5DY Float Spool
    Regular price £36.30
    • All Items Guaranteed
    • Delivery to UK & Ireland

    150L Control Valve 4 Position Detent Kit For 5DY Float Spool

    Key Features

    • Series: 150L GS sectional control valve
    • Spool type: double acting with float ; type 5BY/5DY
    • Detent kit: 4 positions ; float position latched
    • Accessory required: 13QN positioner kit
    • Application: implements needing free float ; e.g. loader lift
    Regular price £36.30
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    HP-LVDT-DIN Double Pilot Check Valves - Approved Hydraulics Limited
    Regular price From £36.24
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Z50 Single Acting Spool - Approved Hydraulics Limited

    POA

    • All Items Guaranteed
    • Delivery to UK & Ireland

    Z50 Single Acting Spool

    Key Features

    • Type: z50 single acting spool for sectional valve
    • Function: selects porting for motor or single acting cylinder
    • Use: configure z series valve bank per function
    • Material: hardened spool with precision grinding
    • Service: replace or build specific sections

    POA

    • Large UK Stock
    • 1 Year Limited Manufacturers Warranty
    • Bespoke Technical Advice
  • Cylinder Seal Kit for Intermercato TG 12, 16, 19, 16 PRO, 16 EG - Approved Hydraulics Limited
    Regular price £36.11
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Cylinder Seal kit 40-70/80 series 204/304/404/504/592

    Key Features

    • Compatibility: Hydra Part cylinder series 204 ; 304 ; 404 ; 504 ; 592
    • Bore sizes: 40 ; 50 ; 63 ; 70/80 mm
    • Intended use: reseal kit for mid size cylinders across the listed series
    • Typical kit contents: piston ; rod ; wiper seals with associated o rings typical to service kits
    • Applications: ag implements ; compact construction machines ; materials handling rams
    • Fitment check: match series code on cylinder plate to ensure correct family selection
    Regular price £36.11
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Seal Kit For Hydra Part MR Motor (Zi) - Approved Hydraulics Limited
    Regular price £35.90
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Seal Kit For Hydra Part MR Motor (Zi)

    Key Features

    • Compatibility: Hydra Part MR high torque orbital motors ; Zi pattern
    • Intended use: seal replacement for motor front end and housing to stop oil leakage
    • Typical kit contents: shaft seal ; housing o rings ; drain and port seals typical for MR motors
    • Applications: industrial and mobile hydraulic drives across compact machinery
    • Service note: check case drain port condition ; replace washers if distorted
    • Selection note: use motor nameplate to match the correct MR kit variant
    Regular price £35.90
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L Monobloc Valve Single acting detent kit in Pos. 2 for spools 3 + 4 10BT
    Regular price £35.48
    • All Items Guaranteed
    • Delivery to UK & Ireland

    45L Monobloc Valve Single acting detent kit in Pos. 2 for spools 3 + 4 10BT

    Key Features

    • Type: 10bt detent kit for single acting spools
    • Positions: holds in position 2
    • Compatibility: spools type 3 ; type 4 on 45l monobloc
    • Use: maintains flow without manual lever force
    • Install: fits spring cap side
    Regular price £35.48
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil, 5 Litres - Approved Hydraulics Limited
    Regular price £35.40
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil, 5 Litres

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 5 Litres
    Regular price £35.40
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 4L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £35.33
    • All Items Guaranteed
    • Delivery to UK & Ireland

    4L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 4 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £35.33
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 80L Control Valve Single Acting Spool On A Port,  3 Positions, (B plugged)  Type 3
    Regular price £35.14
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L Control Valve Single Acting Spool On A Port, 3 Positions, (B plugged) Type 3

    Key Features

    • Series: 80L GS sectional control valve
    • Spool type: single acting ; type 3
    • Porting: A port active ; B port plugged
    • Positions: 3 positions
    • Typical use: single acting cylinder operation
    Regular price £35.14
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    80L Control Valve Single Acting Spool  on B Port   (Blank A port), Use Std spring Type 4
    Regular price £35.14
    • All Items Guaranteed
    • Delivery to UK & Ireland

    80L Control Valve Single Acting Spool on B Port (Blank A port), Use Std spring Type 4

    Key Features

    • Series: 80L GS sectional control valve
    • Spool type: single acting ; type 4
    • Porting: B port active ; A port plugged
    • Positions: 3 positions
    • Typical use: single acting cylinder operation
    Regular price £35.14
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    45L-50L Control Valve 3 Position Detent Kit (G) - Approved Hydraulics Limited
    Regular price £34.97
    • All Items Guaranteed
    • Delivery to UK & Ireland

    45L-50L Control Valve 3 Position Detent Kit (G)

    Key Features

    • Part number: 30075303
    • Compatibility: 45L; 50L control valve family
    • Detent type: 3 position detent kit; type G
    • Function: Locks spool in 3 working positions without holding the lever
    • Typical use: Continuous functions such as motors or extended actuator cycles
    • Installation: Retrofit kit for valve spool end cap assembly
    Regular price £34.97
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 24VDC Coil For Z80 Valve 22mm Hole x 54mm Long - Approved Hydraulics Limited
    Regular price £34.88
    • All Items Guaranteed
    • Delivery to UK & Ireland

    24VDC Coil For Z80 Valve 22mm Hole x 54mm Long

    Key Features

    • Voltage: 24 vdc
    • Bore: 22 mm
    • Length: 54 mm
    • Use: z80 sectional valve coils
    • Connector: din plug
    Regular price £34.88
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12VDC Coil For Z80 Valve 22mm Hole x 54mm Long - Approved Hydraulics Limited
    Regular price £34.88
    • All Items Guaranteed
    • Delivery to UK & Ireland

    12VDC Coil For Z80 Valve 22mm Hole x 54mm Long

    Key Features

    • Voltage: 12 vdc
    • Bore: 22 mm
    • Length: 54 mm
    • Use: z80 sectional valve coils
    • Connector: din plug
    Regular price £34.88
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Hydra Part for Professional Hydraulic Applications

Discover quality hydra part 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 lever operated monoblock valves, cetop 3 spares, scanreco spares accessories, scanreco 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.