Penberthy Jet Pumps (Eductors/Ejectors)

Flow Factor sells low head, medium head, and high head Penberthy Gas/Steam Motive and Liquid Motive Jet Pumps (Eductors/Ejectors) in Bronze, Cast Iron, Carbon Steel (CS), Stainless Steel (SS), Monel, Hastelloy, PVC, and Polypropylene.

Gas/Steam Motive Jet Pumps

• GL Series: Low Head Gas Motive Jet Pumps

• GH Series: High Head Gas Motive Jet Pumps

Liquid Motive Jet Pumps

• LL Series: Low Head Liquid Motive Jet Pumps

• LM Series: Medium Head Liquid Motive Jet Pumps

• LH Series: High Head Liquid Motive Jet Pumps

Steam Heating and Mixing Eductors

• ELL Series: Steam Heating Eductors

• CTE Series: Mixing Eductors

Principle of Operation for Jet Pumps

While Penberthy jet pumps may differ in appearance, basic operation is the same. Jet pumps, also known as eductors, operate on the principles of fluid dynamics. An operating fluid media, which is referred to as the MOTIVE, place under pressure enters the inlet and is forced through the nozzle where it is converted into a high-velocity stream. This high-velocity stream decreases the pressure in the suction chamber, creating a partial vacuum that draws the suction material into the chamber where it is entrained by the motive media. Once the SUCTION stream is drawn in, shear between motive media and the transported material causes both media to be intermixed and pumped out the DISCHARGE outlet, dispelled at a pressure greater than the of the SUCTION stream but lower than that of the MOTIVE. This basic principle of fluid dynamics is what makes Penberthy jet pumps work. (Jet Pump Cutaway)

MOTIVE:
This function is the power phase of the pumping operation. At this stage, the velocity of the motive media increases as it passes through a nozzle. This phase of the pumping operation takes advantage of the kinetic properties of the motive media, whether it is liquid, steam or gas. Because of this, design differences may exist within the motive connection of the jet pump. For instance, jet pumps with liquid motives use a converging nozzle, since liquids usually cannot be compressed. On the other hand, jet pumps with gas or steam motives use converging/diverging nozzles to achieve trans-sonic flow velocity. The critical flow paths of all Penberthy jet pumps are smoothly machined with no abrupt turns or steps in order to produce the most efficient flow during the motive function. Without this direct flow design and smooth interior surface, the jet pump would not operate at peak efficiency.

SUCTION:
This connection of the jet pump is where the pumping action takes place. The high velocity stream of the motive causes a drop in pressure in the suction chamber. This allows pressure in the suction vessel to push a liquid, steam or gas into the suction chamber of the jet pump. This, in turn, is entrained by the high-velocity motive stream emerging from the inlet nozzle

DISCHARGE:
As the motive flow combines with the suction medium, some kinetic energy of the MOTIVE is transferred to the SUCTION, mixing and discharging at a reduced pressure. The amount of pressure that can be recovered depends on the ratio of the MOTIVE flow to SUCTION flow, plus the amount of SUCTION pressure built up in the suction vessel. Kinetic energy is converted back to pressure as the mixed media passes through the diverging taper and is discharged out the pump.