DZT Seismic Damped Spring Vibration Isolator

The DZT Seismic Damped Spring Vibration Isolator is a heavy-duty vibration isolation solution specifically designed for equipment installed in seismic-prone areas. Its key feature is a reinforced side-plate protection structure, which provides lateral restraint and helps prevent equipment overturning or excessive displacement during earthquakes, improving equipment stability and operational safety.

Unlike conventional spring vibration isolators, the DZT series combines seismic protection, vibration isolation, and adjustable damping in one robust design. The upper and lower surfaces feature bonded anti-slip rubber pads for noise reduction and enhanced stability, while adjustable lateral rubber damping blocks help control horizontal movement and vibration.

How Does the DZT Seismic Damped Spring Vibration Isolator Provide Seismic Protection?

The DZT Seismic Damped Spring Vibration Isolator is a heavy-duty vibration control device engineered for industrial equipment requiring both effective vibration isolation and enhanced seismic protection. Its most distinctive feature is the reinforced side-plate protection design, which provides lateral restraint and helps prevent equipment overturning or excessive displacement during earthquakes.

Unlike conventional spring vibration isolators that primarily control vertical vibration, the DZT series incorporates a protective steel housing with side plates, adjustable lateral rubber damping blocks, and high-strength steel springs. This combination supports equipment stability under normal operating conditions while providing additional restraint during seismic disturbances.

The upper and lower mounting surfaces are fitted with bonded sound-insulating, anti-slip rubber pads. These pads help reduce structure-borne noise, improve contact stability, and minimize vibration transmission between machinery and supporting structures.

The lateral rubber damping blocks allow adjustment of the damping resistance, helping control horizontal movement. The upper mounting plate includes bolt holes for equipment attachment, while the lower base incorporates foundation anchoring holes for secure installation.

An additional advantage is the adjustable leveling mechanism. When uneven loading or differences between the equipment’s center of gravity and the vibration isolation system’s stiffness center cause inconsistent static deflection, the leveling nuts can be adjusted to achieve a uniform installation height.

1. How Do I Select the Correct DZT Seismic Spring Vibration Isolator?

Selection begins with determining the total operating weight of the equipment, including motors, fluids, supporting frames, and accessories. The load at each mounting position should then be calculated based on the equipment’s center of gravity and support arrangement.

The DZT series provides 11 load specifications ranging from 720 kg to 12,600 kg per isolator. Engineers should also evaluate operating speed, required static deflection, installation height, seismic design loads, and foundation conditions before selecting a suitable model.

2. What Materials Are Used in DZT Seismic Damped Spring Isolators?

The DZT isolator incorporates a steel structural housing, load-bearing coil springs, rubber damping blocks, and bonded rubber pads on the upper and lower mounting surfaces.

The steel components provide structural support and lateral restraint, while the springs carry the equipment load and provide vibration isolation. Rubber components contribute damping, friction, and noise reduction.

Specific steel grades, spring materials, rubber compounds, surface coatings, and corrosion protection options should be confirmed against the selected model’s technical documentation and environmental requirements.

3. What Is the Maximum Load Capacity of a DZT Seismic Spring Isolator?

The DZT series consists of 11 models with individual rated load capacities ranging from 720 kg to 12,600 kg.

The correct model must be selected according to the actual load supported at each mounting point rather than simply dividing the total equipment weight by the number of isolators.

Uneven load distribution can result from an offset center of gravity or asymmetric equipment construction. The selected isolators must operate within their specified load ranges while providing suitable static deflection and adequate seismic restraint.

4. How Should DZT Seismic Vibration Isolators Be Installed?

DZT isolators should be positioned beneath designated equipment support points on a structurally suitable foundation. The lower mounting holes are used for foundation anchoring, while the upper mounting holes connect the isolators to the equipment frame.

After positioning, the leveling nuts can be adjusted to achieve the required installation height and balanced support conditions.

Engineers should verify anchor bolt specifications, foundation strength, equipment alignment, and clearance around the seismic restraint components. Installation should follow approved drawings and applicable seismic design requirements.

5. Can DZT Seismic Spring Isolators Reduce Both Vertical and Horizontal Vibration?

Yes. The coil springs primarily provide vertical vibration isolation, while the lateral rubber damping blocks contribute resistance to horizontal movement.

The DZT series has a stated natural frequency below 5.1 Hz and a damping ratio of 0.04–0.10. Actual isolation performance depends on operating frequency, supported load, spring stiffness, and installation conditions.

The seismic side plates provide additional restraint against excessive movement. They should not be interpreted as active seismic control devices or as a guarantee of protection under every earthquake condition.

6. Are DZT Seismic Isolators Suitable for Rooftop Cooling Towers and Chillers?

DZT isolators are suitable candidates for rooftop cooling towers, centrifugal chillers, and other heavy HVAC equipment where both vibration isolation and seismic restraint are required.

Rooftop installations demand particular attention to lateral forces, equipment center of gravity, wind loading, and structural anchoring.

The reinforced side-plate arrangement helps limit excessive displacement, while the spring system reduces normal operating vibration. Engineers should coordinate isolator selection with structural calculations, equipment manufacturer requirements, flexible pipe connections, and the project’s applicable seismic design criteria.

7. Can DZT Seismic Damped Spring Vibration Isolators Be Customized?

Customization can be evaluated according to equipment weight, mounting dimensions, load distribution, operating speed, and project-specific seismic requirements.

Potential engineering considerations include mounting hole arrangements, installation height, damping adjustment requirements, corrosion protection, and compatibility with equipment support frames.

For special applications, customers should provide equipment drawings, individual support loads, center-of-gravity information, operating conditions, and foundation details. Any requested modifications must be technically reviewed to ensure that load capacity, vibration isolation performance, and seismic restraint requirements remain compatible.

Key Features

Seismic Anti-Overturning Protection: Reinforced side plates provide lateral restraint to help reduce the risk of equipment overturning during seismic events.
Heavy-Duty Load Capacity: 720–12,600 kg per isolator.
Adjustable Lateral Damping: Rubber damping blocks help control horizontal vibration and movement.
Anti-Slip & Noise Reduction: Rubber pads on both mounting surfaces improve stability and reduce structure-borne noise.
Adjustable Installation Height: Leveling nuts allow precise height adjustment and load balancing.
Reliable Foundation Connection: Mounting holes enable secure equipment and foundation anchoring.

Factory Shipment Photo