C-Type vs. Z-Type Continuous Vertical Conveyors: How the Layout Affects Mechanical Design

The Basic Difference: Same-Side or Opposite-Side Transfer

The main difference between a C-Type and a Z-Type continuous vertical conveyor is the position of the infeed and discharge.

In a C-Type configuration, the product enters and leaves from the same side of the machine. In a Z-Type configuration, the infeed and discharge are arranged on opposite sides.

The difference is simple on a layout drawing, but it changes the way the carrier and chain circulate inside the machine.

Design point	C-Type	Z-Type
Infeed	Same side	One side
Discharge	Same side	Opposite side
Product flow	Returns to the same side	Transfers to the opposite side
Main consideration	Same-side line layout	More direct line arrangement

The configuration is normally selected from the line layout first. Lifting height, product size and throughput then determine the detailed mechanical design.

Chain Routing and Carrier Return

Both configurations use a continuous closed chain path, but the return path is different.

In a Z-Type conveyor, the upper and lower transfer points face opposite directions. The chain and carriers can therefore follow a relatively direct circulation path between the two levels.

In a C-Type conveyor, the infeed and discharge remain on the same side. After completing the lifting and discharge cycle, the carriers need to return to the original side before entering the next loading cycle. The return path is therefore a more significant part of the machine layout.

For a comparable lifting height, a C-Type arrangement may require a longer chain path and additional space for the return sections.

The exact sprocket arrangement depends on the carrier design, chain configuration, drive arrangement and machine structure. C-Type and Z-Type should not be defined by a fixed number of sprockets.

Carrier Movement Through the Return Sections

The carrier design is closely related to the chain path.

During product transfer, the carrier needs to remain stable so that the product can enter and leave the conveyor correctly. Depending on the design, the carrier may be pivot-mounted to the chain and follow the chain through the return sections while maintaining the required product orientation.

This makes the return area an important part of the mechanical design, particularly on a C-Type conveyor.

The carrier, product, chain, guide components and machine frame all need sufficient clearance throughout the turning path. The clearance also affects the carrier guide design, maintenance access and overall machine dimensions.

For this reason, the upper and lower return sections should be checked as part of the mechanical design rather than treated as simple chain-turning areas.

Frame Structure and Space Requirements

The different chain paths also affect the machine frame.

A continuous vertical conveyor needs sufficient stiffness to maintain the alignment of the chains, sprockets and carriers. The upper and lower return sections require particular attention because the chain changes direction and the carrier follows the return path.

In a C-Type machine, the same-side layout means that the return path has to be accommodated within the overall machine arrangement. Depending on the carrier and frame design, this can increase the required machine depth or footprint.

A Z-Type machine can often use a more direct arrangement when the upper and lower conveyors are allowed to face opposite directions.

The final footprint is still project-dependent. Product dimensions, carrier size, lifting height, transfer conveyor arrangement and available installation space all affect the result.

Layout consideration	C-Type	Z-Type
Same-side infeed and discharge	Suitable	Not typical
Opposite-side infeed and discharge	Not typical	Suitable
Return path	Generally more involved	Generally more direct
Machine footprint	Project-dependent	Project-dependent
Typical layout requirement	Same-side transfer	Opposite-side transfer

Speed and Throughput

C-Type and Z-Type conveyors are sometimes compared simply by saying that one is faster than the other. The configuration alone does not determine the conveyor's throughput.

Actual capacity depends on:

• Product dimensions and weight
• Carrier pitch
• Number of carriers
• Lifting height
• Chain speed
• Infeed transfer time
• Discharge transfer time
• Acceleration and deceleration requirements

The C-Type return path can introduce additional mechanical considerations around the upper and lower return sections. When higher throughput is required, carrier movement and transfer timing need to be checked together.

A Z-Type arrangement may provide a more direct carrier path, but its actual speed and capacity still depend on the machine design.

C-Type does not automatically mean low throughput, and Z-Type does not automatically mean high throughput. The required capacity should be calculated from the complete conveyor cycle.

Chain Wear, Tension and Maintenance

Both configurations require regular inspection of the chain, sprockets, carrier connections and guide components.

The C-Type configuration can have a longer circulation path and additional return sections. Chain elongation, tension adjustment and alignment therefore need to be considered during design.

The tensioning system must maintain reliable chain engagement throughout the circulation path. The return sections should also provide sufficient access for inspection, lubrication and adjustment.

Maintenance access is particularly important around the upper and lower return areas. Chain inspection, tension adjustment and replacement of wear components should be possible without unnecessarily difficult access to the machine.

For both configurations, maintenance requirements should be considered during the initial mechanical design rather than after the machine has been installed.

When Is a C-Type the Better Choice?

A C-Type continuous vertical conveyor is generally considered when the production-line layout requires the infeed and discharge to remain on the same side.

It can be suitable when:

• The upper and lower conveyors need to face the same direction.
• Existing equipment limits the available transfer direction.
• The production line requires a same-side material flow.
• The available space can accommodate the required return path.

The main advantage of the C-Type is its ability to fit a same-side conveyor layout.

During design, particular attention should be given to the return sections, carrier clearance, machine depth and maintenance access.

When Is a Z-Type the Better Choice?

A Z-Type configuration is generally considered when the upper and lower conveyors can be arranged on opposite sides.

It can be suitable when:

• The production line allows opposite-side transfer.
• A more direct conveyor arrangement is preferred.
• The surrounding equipment provides space on both sides of the machine.
• The conveyor layout naturally supports opposite-side infeed and discharge.

When the surrounding line already has conveyors on opposite sides, the Z-Type can provide a straightforward material-flow arrangement.

C-Type or Z-Type: Start With the Layout

There is no universal answer to whether a C-Type or Z-Type continuous vertical conveyor is better.

The first question is where the product needs to enter and leave the machine.

If both transfer points must remain on the same side, the C-Type configuration provides the required layout. If the production line allows the infeed and discharge to face opposite directions, the Z-Type configuration may provide a more direct arrangement.

The mechanical design should then be checked against the actual product, lifting height, throughput, carrier dimensions, available space and maintenance requirements.

The difference between C-Type and Z-Type is not simply a difference in appearance. The layout determines the chain path, and the chain path influences the carrier arrangement, frame design, space requirements and maintenance considerations.