• BSPP Single Acting Counterbalance Valves for Closed Centre with Steel Body
    Regular price From £58.49
    • All Items Guaranteed
    • Delivery to UK & Ireland

    BSPP Single Acting Counterbalance Valves for Closed Centre with Steel Body

    Key Features

    • Type: single acting counterbalance valve for closed centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price From £58.49
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body - Approved Hydraulics Limited
    Regular price From £51.92
    • All Items Guaranteed
    • Delivery to UK & Ireland

    BSPP Single Acting Counterbalance Valves for Open Centre with Steel Body

    Key Features

    • Type: single acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price From £51.92
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BYPASS VALVE TO WORK IN PUMPS FROM 17cc/rot TO 60cc/rot; 24 VDC
    Regular price £477.13
    • All Items Guaranteed
    • Delivery to UK & Ireland

    BYPASS VALVE TO WORK IN PUMPS FROM 17cc/rot TO 60cc/rot; 24 VDC

    Key Features

    • Compatibility: pump sizes 17–60 cc/rev
    • Coil: 24 VDC solenoid (12 V on request)
    • Max pressure: up to 350 bar family rating
    • Function: unloads pump by bypassing pressure to inlet
    • Variants: versions with integrated relief valve available
    • Mounting: bolts to pump end‑cap (symmetrical orientation)
    Regular price £477.13
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BYPASS VALVE TO WORK IN PUMPS OF 80cc/rot; 24 VDC
    Regular price £446.27
    • All Items Guaranteed
    • Delivery to UK & Ireland

    BYPASS VALVE TO WORK IN PUMPS OF 80cc/rot; 24 VDC

    Key Features

    • Model: BP80H (without relief)
    • Pump size: 80 cc/rotation
    • Solenoid: 24 VDC
    • Pressure class: up to 350 bar (family rating)
    • Function: unloads pump by bypassing to inlet
    • Mounting: bolts to pump end-cap; symmetrical orientation
    • Operation: actuate only at no-load (<20 bar)
    Regular price £446.27
    • 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.

  • CABLE FOR MEC.OPERATION 3,0M WITH LEVER
    Regular price £136.88
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CARRY OVER PLUG For AK 50 Control Valve - Approved Hydraulics Limited
    Regular price £8.86
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cavity Plug - Approved Hydraulics Limited
    Regular price £3.42
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Cavity Plug

    Key Features

    • Cavity: sae 08 ; 3/4-16 unf
    • Function: blank unused screw in cartridge cavity
    • Sealing: o ring 14.00 x 1.78 mm class
    • Material: steel ; zinc plated
    • Pressure rating: up to 350 bar typical
    • Use: testing ; bypass ; shipping seal
    Regular price £3.42
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Central Manifold For AC Power Pack And 123mm Tank Flange - Approved Hydraulics Limited
    Regular price £47.70
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Central Manifold For AC Power Pack And 123mm Tank Flange

    Key Features

    • Interface: 123 mm tank flange to central manifold
    • System: ac motor power pack
    • Function: routes pump ; return ; relief to cetop stack
    • Compatibility: cetop 3 spacer 30 mm ; stackable manifold 3/8 side ports
    • Use: base for ac mini power pack assemblies
    Regular price £47.70
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3  Spacer 23mm Thick For 500208 (DC) Manifold 500208 - Approved Hydraulics Limited
    Regular price £14.37
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Spacer 23mm Thick For 500208 (DC) Manifold 500208

    Key Features

    • Category: hydraulic power pack component
    • Use: mobile ; industrial hydraulic circuits
    • Interfaces: bsp threads ; cetop ; b14 per model
    • Notes: see product page for detailed model specific data
    • Status: placeholder; requires deeper model data
    Regular price £14.37
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3  Spacer 30mm Thick For 500050-2 (AC) Manifold - Approved Hydraulics Limited
    Regular price £14.37
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Spacer 30mm Thick For 500050-2 (AC) Manifold

    Key Features

    • Category: hydraulic power pack component
    • Use: mobile ; industrial hydraulic circuits
    • Interfaces: bsp threads ; cetop ; b14 per model
    • Notes: see product page for detailed model specific data
    • Status: placeholder; requires deeper model data
    Regular price £14.37
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £134.20
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 - P Blocked - A&B to T with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; p blocked ; a ; b to t
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £134.20
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £168.26
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 - P to T - A&B Blocked with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; p to t ; a ; b blocked
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £168.26
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £134.20
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 All Ports Blocked with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; all ports blocked
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £134.20
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 All Ports Blocked with Manual Lever - Approved Hydraulics
    Regular price From £116.29
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 All Ports Connected with Manual Lever

    Key Features

    • Interface: cetop 3 ; ng06 ; iso 4401-03
    • Actuation: manual lever
    • Spool function: ng06 ; all ports connected
    • Mounting: sandwich between manifold and subplate
    • Use: manual override ; test ; emergency operation
    Regular price From £116.29
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Aluminium Manifolds - P & T 1/2" - A & B 3/8" - Approved Hydraulics Limited
    Regular price From £41.57
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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 £41.57
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  - 12VDC, (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.79
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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 £13.79
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil  -24VDC Coil (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £15.14
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Coil -24VDC Coil (23mm Bore x 50mm long)

    Key Features

    • Voltage: 24 vdc
    • Bore: 23 mm
    • Length: 50 mm
    • Connection: din 43650 a
    • Use: cetop 3 solenoid valves
    Regular price £15.14
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 3 Coil – 220VAC-50HZ  (23mm Bore x 50mm long) - Approved Hydraulics Limited
    Regular price £13.79
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Coil – 220VAC-50HZ (23mm Bore x 50mm long)

    Key Features

    • Valve size: CETOP 3 ; NG6 ; ISO 4401-03
    • Voltage: 220 VAC 50 Hz
    • Core ; length: Ø 23 mm bore ; 50 mm long
    • Connector: DIN 43650 Form A
    • Protection: IP65 with correct DIN plug
    • Notes: ensure AC coil ; armature pairing per manufacturer
    Regular price £13.79
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body - Approved Hydraulics Limited
    Regular price £105.86
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Cetop 3 Double Acting Counterbalance Valve For Open Centre - 350bar - Steel Body

    Key Features

    • Type: double acting counterbalance valve for open centre systems
    • Ports: as specified
    • Function: load holding; prevents overrunning loads
    • Modulation: opens with pilot pressure proportional to load
    • Benefit: stable lowering and shock protection
    • Body: steel; serviceable adjuster with lock
    Regular price £105.86
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Double Solenoid Control Valve NG06, A & B to T - P Blocked - Approved Hydraulics
    Regular price From £66.62
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Double Solenoid Control Valve NG06, A & B to T - P Blocked

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Centre spool: a and b to t ; p blocked
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Manual override: standard on all valves
    • Connector: din plug with led
    • Switch time: 50 to 70 ms
    Regular price From £66.62
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Double Solenoid Control Valve NG06, All Ports Blocked - Approved Hydraulics
    Regular price From £67.01
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Double Solenoid Control Valve NG06, All Ports Blocked

    Key Features

    • Centre spool: all ports blocked
    • Interface: iso 4401-03 cetop 3 ng06
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £67.01
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Double Solenoid Control Valve NG06, All Ports Open - Approved Hydraulics
    Regular price From £66.62
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Double Solenoid Control Valve NG06, All Ports Open

    Key Features

    • Centre spool: all ports open
    • Interface: iso 4401-03 cetop 3 ng06
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Connector: din plug with led
    • Manual override: standard on all valves
    Regular price From £66.62
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part CETOP 3 Double Solenoid Control Valve NG06, P to T - A & B Blocked - Approved Hydraulics
    Regular price From £71.35
    • All Items Guaranteed
    • Delivery to UK & Ireland

    CETOP 3 Double Solenoid Control Valve NG06, P to T - A & B Blocked

    Key Features

    • Interface: iso 4401-03 cetop 3 ng06
    • Centre spool: p to t ; a and b blocked
    • Max flow: 60 lpm
    • Max pressure: p ; a ; b 315 bar ; t 160 bar
    • Coils: 12 vdc ; 24 vdc ; 110 vac 50hz ; 220 vac 50hz
    • Ingress protection: ip65
    • Manual override: standard on all valves
    • Connector: din plug with led
    • Switch time: 50 to 70 ms
    Regular price From £71.35
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • placeholder
    Regular price £122.53
    • All Items Guaranteed
    • Delivery to UK & Ireland

    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 £122.53
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

All for Professional Hydraulic Applications

Discover quality all 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.