Explore the DVP Side Channel Blower Range

Higher Differential Pressure from a Compact Oil-Free Blower

The DVP TDL range is designed for systems that need more suction or delivery pressure than a single-stage side channel blower can economically provide. Air entering the blower passes through two regenerative stages, allowing energy to be added twice before the air leaves the unit.

This staged compression increases the pressure difference between the inlet and outlet without introducing oil into the air stream. The result is a clean, continuous and low-pulsation supply suitable for sensitive machinery and industrial processes.

TDL blowers can be installed for either vacuum or pressure duty and are particularly useful where the system has longer pipe runs, greater resistance, lifting requirements or a demanding operating point.

When Is a Double-Stage Blower the Right Choice?

A double-stage blower is generally selected when the required vacuum or positive pressure exceeds the practical capability of a single-stage model, but the process still benefits from clean, oil-free and contact-free air movement.

Compared with a single-stage unit, the TDL arrangement prioritises differential pressure rather than maximum free-air volume. This makes it well suited to systems with restrictive pipework, deeper suction requirements, elevated discharge pressure or sustained load.

Where very high flow is more important than differential pressure, a single-stage or parallel-stage blower may be more suitable. Where the pressure requirement is still higher, a triple-stage design should be considered.

Key Benefits of DVP TDL Double-Stage Blowers

Typical Applications for TDL Blowers

DVP TDL double-stage blowers are used where clean air and a stronger pressure differential are more important than maximum unrestricted airflow.

How Double-Stage Vacuum and Pressure Operation Works

For vacuum duty, the process is connected to the blower inlet. For pressure duty, the process is connected to the outlet. In both cases, the air passes through two regenerative compression stages before discharge.

The maximum permitted vacuum or pressure depends on the exact model, motor rating, frequency and operating point. Greater system resistance increases the pressure differential and can also increase motor current and air temperature.

The blower must therefore be selected from its performance curve rather than from nominal airflow alone. Relief valves, filters and other accessories may also be required to keep the blower within its safe operating envelope.

Double-Stage TDL Model Specification Table

Select a TDL model by comparing airflow, motor power, achievable vacuum and maximum pressure at the intended operating frequency. Final selection should also consider system resistance, duty cycle, ambient conditions and the required operating point.

Selecting the Correct TDL Model

The best model is not necessarily the one with the closest nominal airflow. Selection should be based on the required flow at the actual vacuum or pressure level, not at free-air conditions.

Pipe diameter, pipe length, bends, valves, filters, silencers, diffusers, leakage and process restrictions all contribute to system resistance. These factors determine where the blower will operate on its performance curve.

Vacuum Pumps UK can review your application data and recommend a suitable TDL model, motor configuration and accessory package.

Why the Performance Curve Matters

A side channel blower does not deliver the same airflow at every pressure. Available airflow decreases as system resistance and differential pressure rise.

The performance curve shows the relationship between airflow, vacuum or pressure and motor loading. It should be used to confirm that the required operating point falls within the safe continuous-duty area.

Operating too close to the maximum limit can increase temperature and current draw, so a reasonable selection margin is normally advisable.

Accessories and System Protection

Installation Considerations

Install the blower on a stable surface with sufficient ventilation around the motor and blower casing. Pipework should be adequately sized, independently supported and arranged to minimise unnecessary restriction.

Ensure the electrical supply, motor connection and overload protection match the motor nameplate. Three-phase rotation must be checked before the blower is placed into service.

Air temperature, ambient temperature, altitude, duty cycle and the nature of the gas should all be considered during selection and installation.

Maintenance and Service Support

TDL blowers require relatively little routine maintenance because the impeller does not contact the housing and no oil is used within the compression path.

Maintenance normally focuses on keeping filters and cooling passages clear, checking electrical connections, inspecting pipework and monitoring the blower for unusual noise, vibration or temperature.

Vacuum Pumps UK can supply replacement blowers, accessories and technical support, while our associated VacAir Superstore workshop provides inspection and repair services for industrial vacuum and pressure equipment.

Why Buy DVP TDL Blowers from Vacuum Pumps UK?

Vacuum Pumps UK is the UK & Ireland Master Agent for DVP Vacuum Technology, providing direct access to DVP product knowledge, genuine equipment and application support.

Our team can help compare airflow and differential pressure requirements, identify the correct motor arrangement and advise on filters, relief valves, silencers and installation considerations.

For a replacement blower or a new application, send us the required duty and we will help match it to the most suitable TDL model.

Frequently Asked Questions