Double vs. Single Acting Hydraulic Cylinders: Why Choose Double?

Understanding the differences between double-acting and single-acting hydraulic cylinders is crucial for selecting the right component for your needs. Double-acting cylinders offer "power up/power down" functionality, whereas single-acting cylinders rely on "power up/gravity down."

Here are five compelling reasons to opt for double-acting hydraulic cylinders:

1. Enhanced Availability

  Standard cylinders are predominantly double-acting, offering broader availability. While conversion to single-acting is possible, it's not ideal due to potential issues with o-ring piston seals. Double-acting cylinders with robust seals like the crown or Hallite 775 are more reliable, even in single-acting applications.

2. Reliable Retraction

  Double-acting cylinders ensure consistent retraction under pressure, eliminating concerns about insufficient force to lower the cylinder—a common issue with single-acting cylinders in applications like dump trailers.

3. Reduced Fluid Reservoir Size

  As double-acting cylinders can store fluid, they allow for a smaller hydraulic fluid reservoir, which is particularly beneficial in space-constrained applications with DC hydraulic power units.

4. Versatility in Application

  Double-acting cylinders are often the only feasible option for equipment requiring bidirectional control, such as log splitters, steering units, and digging tools, especially where gravity cannot be relied upon.

5. Corrosion Prevention

  Single-acting cylinders are prone to corrosion due to un-lubricated rods and potential moisture ingress. This can lead to rapid deterioration of the cylinder's integrity and sealing, causing leaks and reduced lifting power.

While single-acting cylinders have their place, particularly in vertically oriented, well-maintained applications, double-acting cylinders generally offer greater reliability and efficiency.

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