Advantages of Our Siphons

Siphons are our primary business not a secondary line. We are the experts in the industry. We have made the investment in tooling to mold our siphons as opposed to gluing them together with PVC pipe and fittings. Molded siphons have a one-piece trap and bell with no glue joints, and are dimensionally consistent. They are stronger and designed to optimize the performace of the siphon; the design is not constrained by the limits of off-the-shelf PVC fittings.

Advantages of a Molded Siphon

Fluid Dynamic Siphons molds its automatic dosing siphons from high density polythylene plastic. At least one of our competitors fabricates their siphons from PVC pipe and fittings. We believe that our molded siphon has several advantages:

• Both the siphon trap and bell are one piece with no seams or glued joints. A fabricated siphon has several glued joints all of which must be air and watertight or the siphon will likely fail.


• Molded siphons are very consistent dimensionally. A fabricated siphon is prone to dimensional variations due to human error or carelessness.


• Fabricated siphons are limited in design by the availability of PVC fittings that are available. It is important that the invert of the siphon be flat at the top in order to force as large an air bubble as possible across the invert of the siphon as the siphon comes into operation. PVC fittings invariably have round cross sections. The outlet of our siphon has a hook molded into place at the outlet to prevent effuent from back flowing into the siphon trap. Fabricated siphons do not have this feature.


• High density polyethylene is much less brittle than PVC and has a reduced coefficient of friction. This makes a molded siphon less prone to damage by freezing water.