Cookie Consent by Free Privacy Policy Generator
raise lower valve

What is a Raise/Lower Valve?


If you're into the nitty-gritty of commercial vehicles, you've probably come across the term "Raise/Lower Valve" when dealing with HGV trailers. But what exactly does it do, and why is it crucial? Let's dive in!

What is a Raise/Lower Valve?

The Raise/Lower Valve is a fundamental component in the hydraulic system of heavy goods vehicle (HGV) trailers. Its primary function is to control the height of the trailer, specifically adjusting the height of the trailer bed or body.

Why is it Important?

  1. Adaptability:

    • One of the key reasons for having a Raise/Lower Valve is adaptability. HGVs transport a variety of loads, and the height of the trailer needs to be adjusted based on the type of cargo being carried.
  2. Loading and Unloading:

    • Imagine loading or unloading goods from a trailer that's too high or too low – it's not just inconvenient, but also unsafe. The Raise/Lower Valve allows for precise adjustments to ensure efficient and secure loading and unloading processes.
  3. Stability on the Road:

    • Maintaining the right height contributes to the overall stability and handling of the HGV on the road. It helps in preventing issues like swaying or uneven weight distribution.

How does it Work?

The Raise/Lower Valve is typically part of the hydraulic system. When activated, it adjusts the pressure in the suspension system, causing the trailer to either rise or lower. This can be manually controlled by the driver, giving them the flexibility to adapt to different situations.

What is Ride Height?

Ride height refers to the distance between the chassis or undercarriage of an HGV trailer and the ground. The Raise/Lower Valve plays a pivotal role in adjusting this height, allowing drivers to optimize it based on the specific requirements of their cargo and road conditions.

By understanding and controlling the ride height, drivers can ensure not only a smoother ride but also enhance the overall performance and safety of the HGV on the road.


In the world of HGV trailers, the Raise/Lower Valve is a small yet mighty component that plays a significant role in ensuring a smooth and efficient transportation process. Whether it's about accommodating various cargo sizes or maintaining stability on the road, this valve is a go-to for trailer height adjustments.

Published: Fri 15 Dec 2023

Updated: Thu 11 Apr 2024

Don-Bur (Bodies & Trailers) Ltd

phone icon
Call us
+44(0)1782 599 666