Hydraulic lifts are a popular choice for many low to mid rise buildings across the UK because they are reliable, cost effective and efficient in smaller spaces. If you have ever wondered how hydraulic lifts work, this guide will walk you through the full process in clear and practical terms.
At Lancs & Cumbria Lifts, our lift installers work with a wide range of hydraulic lift systems. Below we explain how they operate, the core components involved and the situations where a hydraulic lift is the most suitable option.
What Is a Hydraulic Lift
A hydraulic lift uses fluid pressure to move a lift car up and down a lift shaft. Instead of cables or counterweights, hydraulic elevators rely on hydraulic fluid, a pump unit and a cylinder containing a piston. When pressure increases, the lift travels upward. When pressure is released, the lift descends smoothly and safely.
Hydraulic lifts are commonly used in:
- Low to mid rise commercial buildings
- Residential blocks and conversions
- Warehouses and industrial sites
- Care homes and accessibility projects
- Car parks and vehicle lifting applications
Hydraulic lift systems are highly effective for buildings where travel distances are modest and where space saving machinery is an advantage.
The Main Components of a Hydraulic Lift
1. Hydraulic Power Unit
This sits either in a machine room or in a compact cabinet. It contains:
- An electric motor
- A pump that pushes oil into the system
- A tank for hydraulic fluid
The pump pushes oil into the cylinder to generate pressure. When the lift travels downwards, the fluid is released and allowed to flow back into the tank.
2. Cylinder and Piston (Ram)
The piston sits inside a steel cylinder. When hydraulic fluid enters the cylinder, the piston rises and lifts the car. When fluid pressure is reduced, the piston lowers.
3. Control Valves
These regulate the direction and speed of the lift. They allow precise control over how the lift travels and when it slows or stops.
4. Lift Car
This is the passenger or goods cabin that users travel in. Hydraulic lifts are known for smooth travel quality because hydraulic pressure absorbs vibration.
5. Guide Rails and Safety Gear
Guide rails keep the lift car aligned and stable. Safety gear includes rupture valves, overspeed protection and emergency lowering systems that activate if the lift loses pressure or power.
How Do Hydraulic Lifts Work Step by Step
1. A User Calls the Lift
The lift receives a signal and prepares to move.
2. The Pump Activates
The electric motor powers the pump and the pump pushes oil into the hydraulic cylinder.
3. Fluid Pressure Lifts the Car
As hydraulic fluid fills the cylinder, it forces the piston upward. This raises the lift car through the shaft.
4. The Lift Stops at the Correct Floor
Control valves reduce pressure gradually to create a smooth stop and accurate levelling.
5. Returning Downwards
To descend, the system does not use the pump. Instead, a valve opens and allows hydraulic fluid to flow back into the tank. Gravity and controlled pressure release lower the lift safely and efficiently.
This method makes downward travel extremely energy efficient because lifts require minimal power to return to the ground floor.
Types of Hydraulic Lift Systems
Direct Acting Hydraulic Lifts
The piston sits directly beneath the lift car. The car rises as the piston rises. This design is simple and commonly used for short travel distances.
Indirect or Roped Hydraulic Lifts
The piston pulls ropes that lift the car. This reduces cylinder depth which is useful when drilling deep pits is not possible.
Holeless Hydraulic Lifts
Ideal for refurbishments and existing buildings where a deep borehole is not suitable.
Twin Ram Systems
Used for larger lift cars or heavier goods lifts, providing stability and increased load capacity.
Advantages of Hydraulic Lifts
High Load Capacity
Hydraulic lifts are well suited for heavy goods, vehicles or large passenger groups.
Space Saving Machinery
Most hydraulic lifts do not require a large machine room and can be installed in buildings with restricted space.
Cost Effective Installation
Hydraulic lifts are generally more cost effective to install than traction lifts, especially in buildings with limited shaft size.
Smooth and Comfortable Travel
Hydraulic fluid absorbs vibration making the journey comfortable for passengers.
Highly Effective for Low Rise Buildings
Hydraulic systems are ideal for buildings up to around six floors where travel distance is limited.
Limitations to Consider
- Travel height is limited compared to traction lifts
- Heat generation in busy environments may require cooling units
- Slower travel speeds compared to traction systems
- Oil management and environmental considerations
- Energy efficiency depends on pump and valve technology
Maintenance and Common Issues in Hydraulic Lifts
Like all lift systems, hydraulic lifts require regular maintenance to stay safe and reliable. Typical issues include:
- Air entering the hydraulic system
- Oil leaks
- Valve blockages
- Pump wear
- Temperature fluctuations
Regular servicing helps prevent these issues and ensures compliance with UK lift regulations.
Hydraulic systems are mechanically simple but unforgiving about oil condition, seal wear and temperature. Slow levelling, drifting at floor level and oil loss are the faults we attend most often, and all of them worsen if left, so they are worth booking a lift repair for early.
Is a Hydraulic Lift Right for Your Building
A hydraulic lift is often the best solution if your building includes:
- Low to mid rise travel
- Limited shaft space
- High load requirements
- Retrofit conditions where a traction system is impractical
- A need for a cost effective and space saving lift installation
If you are planning a new lift, modernising an existing one or looking for expert advice on hydraulic lift systems, our experienced lift engineers can help.
Speak to Lancs and Cumbria Lifts
For guidance on hydraulic lift installation, upgrades or servicing, contact our team for expert advice and a no obligation quote. We provide reliable, compliant and cost effective lift solutions across the UK.