How do PVC suction hoses perform in high-pressure or high-vacuum applications?

PVC suction hoses are commonly used in a variety of applications such as agriculture, construction, mining, and pumping liquids and materials. While they are generally known for their flexibility and durability, their performance in high-pressure or high-vacuum applications can vary depending on several factors.

Pressure Resistance:
PVC suction hoses have the ability to withstand moderate to high pressure loads, but their performance can be limited in extremely high-pressure applications. The burst pressure, which is the maximum pressure a hose can tolerate before failing, is an important factor to consider. It is typically recommended to use hoses with a burst pressure rating higher than the actual operating pressure to ensure safety and prevent accidents.

In high-pressure applications, hoses with reinforcement layers such as spiral steel wire or polyester yarn are preferred. These reinforcement layers provide additional strength and support to the hose, preventing it from collapsing or bursting under pressure. Therefore, when selecting a PVC suction hose for high-pressure applications, it is critical to consider the burst pressure rating, the type and number of reinforcement layers, and the compatibility of the hose with the application's specific pressure requirements.

Vacuum Resistance:
PVC suction hoses are generally not designed to withstand high-vacuum applications. High vacuum can cause the hose to collapse due to the external atmospheric pressure being greater than the internal pressure. This collapse can obstruct the flow of the material and lead to performance issues or even hose failure.

To overcome this limitation, a vacuum reinforcement or helix wire is often added to PVC suction hoses. The helix wire provides extra strength and prevents the hose from collapsing under the vacuum pressure. Hoses with helix wires are commonly referred to as wire-reinforced suction hoses. The wire can be made of steel or PVC-coated spring steel, depending on the desired level of vacuum resistance.

When selecting a PVC suction hose for high-vacuum applications, it is crucial to consider the vacuum rating, which indicates the maximum level of vacuum the hose can withstand without collapsing. Additionally, factors like the material being pumped, the temperature, and the size and length of the hose can also impact the hose's ability to handle high-vacuum conditions.