Stubbe SP820 is a thermoplastic liquid Injector (Eductor) which uses the venturi principle to allow a secondary media to enter and mix in the main flow stream. It can be used for mixing, dosing and delivering fluids or for evacuating air in lines or tanks. A common use is to allow the correct dosage of fertilizer/nutrients to be delivered to specific vegetables in a market garden.
It is self priming, maintenance free with the housing/nozzle made from UPVC, PP or PVDF with EPDM or FPM sealings. Union ends with solvent weld connectors are standard up to and including DN50. Sizes DN65-80 has DIN spigot ends, so a union is required to allow connection to BS/Ansi dimensioned UPVC pipe.
Working principle: A nozzle (with specific sized bore) is installed in the SP820 injector. The liquid from the main flow-stream is accelerated by the diameter reduction of the nozzle.
This acceleration causes low pressure at the suction spigot which allows the mixing liquid to be drawn into the flow-stream. The suction volume is calculated by using the driving liquid pressure and the diameter of the nozzle bore.
Sizes 3/8″ (DN10) → 3″ (DN80)-10 Bar
* Options: BSP end connectors, Spigot ends for solvent or fusion welding, GFR or PP/Steel flanges.
Technical Specifications| Brand | Stubbe |
| Model | SP820 |
| Type | Eductor |
| Body Style | Union |
| Size Range | DN10 - DN80 |
| Pressure Rating | Up to 10 Bar |
| End Connections | Socket, BSP, Spigot, Flanged |
Material Specifications| Body | PVC-U PP PVDF |
| Sealing | EPDM, FPM |
SP 820 Water Jet Pump Tech Sheet