Applications
Chemicals & Process Industry
Corrosive media, strict tightness requirements, documented processes: in the chemical industry the pump is a safety component.
Your advantages
Hermetically sealed
No leakage path to the outside via a dynamic seal.
Chemically resistant
Wetted parts made of chemically resistant plastic.
Robust in batch operation
Running a vessel empty at the end of a batch does not damage the unit.
Tightness is not a matter of convenience
With aggressive or hazardous media, every leak is an incident — with consequences for plant safety, the environment and documentation. The classic weak point of conventional pumps is the dynamic shaft seal: a component that wears by design and whose sealing effect diminishes over the operating period.
The HODD ranges are of hermetically sealed design. There is no leakage path via a dynamic seal because this seal does not exist. This provides the highest level of safety when handling critical media — and at the same time removes a recurring maintenance topic.
Resistance to what is being conveyed
The wetted parts are made of chemically resistant plastic. That makes the pumps the safe choice for corrosive media and aggressive process conditions — including where metallic materials reach their limits or become uneconomical.
If a solids content is added to the chemical load — which is the normal case with precipitation products, crystallisates or slurries — the wear-resistant design comes into play as well. This combination of chemical and mechanical resistance is the actual design focus of the ranges.
Batch operation without special treatment
Batch processes regularly end with a vessel being run empty. For many pump designs this is a critical moment that requires monitoring, shut-off logic or manual intervention.
Dry-run safety makes this effort unnecessary: an emptied vessel does not damage the unit. The same applies to a closed valve when switching between batches — the pump remains protected even with the suction or discharge line closed.
Frequently asked questions
Which materials come into contact with the medium?
The wetted parts are made of chemically resistant plastic. We match the precise material selection to your medium — please send us the safety data sheet for this.
How is tightness to the outside ensured?
Through the hermetically sealed design. There is no dynamic shaft seal and therefore no leakage path that could wear in operation.
Is the pump approved for use in potentially explosive atmospheres?
We always clarify explosion protection requirements on an application-specific basis. Please state the required zone and the underlying directive in your enquiry.
Is the pump suitable for slurries and crystallisates?
Yes. The wear-resistant design targets media containing solids, the chemical resistance targets aggressive process conditions. This very combination is the design focus.
What happens when the vessel is run empty at the end of a batch?
Nothing. The pump is designed to be dry-run safe; an emptied vessel does not lead to damage.
Contact
We are happy to advise you personally — simply send us your enquiry via the form. For reliable sizing it helps us to have details on the medium, solids content, flow rate and pressure requirement.