Jet ejector · Pumping and mixing

248 water and steam ejector

No moving parts Valfonta 248 water and steam ejector with flanged connections

Jet ejector with no moving parts that pumps or mixes liquids, solids, or gases using the energy of a motive fluid: usually water, steam, or air. It has DIN PN16 flanges and nine sizes, from 1,200 to 72,000 l/h of mixture, rated for 16 barg at 200 °C.

Flow rate1,200 to 72,000 l/h 9 sizes, with motive steam at 4 bar
ConnectionDIN PN16 flanges
SizesDN15 to DN125
Pressure and temperature16 barg at 200 °C
Motive fluidWater, steam, or air
Suctionup to 6.5 m not submerged

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No moving parts: less noise and vibration
Maintenance-free
Performance simulator based on test data
Valfonta, Badalona, since 1962

What the 248 ejector is used for

The 248 is a steam and liquid ejector: a jet of pressurized motive fluid creates a vacuum that draws in the product and drives it, already mixed, toward the discharge. It is used where installing a mechanical pump is difficult.

Because it has no moving parts, it reduces noise and vibration and requires no maintenance. In our article on steam jet ejectors, we explain how they work and where they are used.

Pump primingAn alternative when a self-priming pump is not available.
Water treatmentDrawing a liquid from a tank to add it to the main pipeline.
Adding solidsPumping and mixing solids such as cement, common salt, or gels, and preparing chemical solutions.
Process industryChemical, paper, soap, beer, and alcohol plants, and dye works.
ShipsUse as a bilge pump.

248 ejector technical specifications

Type	Liquid and steam jet ejector, with no moving parts, for pumping or mixing
Motive fluid	Liquid (usually water) or gas (usually steam or air)
Sizes	9 sizes, from 1,200 to 72,000 l/h of mixture, calculated with motive steam at 4 bar
Connections	DIN PN16 flanges as standard: motive from DN15 to DN80; suction and discharge from DN20 to DN125. Other connections on request
Pressure rating	PN16 and PN25 body
Maximum pressure and temperature	16 barg at 200 °C
Body material	WCB carbon steel · RG10 bronze · A351 CF3M stainless steel
Nozzle material	A351 CF3M stainless steel · RG10 bronze · Monel
Suction, submerged	Up to 2 m with cold water; with steam at 5 barg, it lifts up to 38 m
Suction, not submerged	Up to 6.5 m suction lift and 5 to 12 m discharge head, depending on steam pressure
Maintenance	None, as it has no moving parts

Sizes and dimensions

No.	Mixture (l/h)	A	B	C	D	E	F	G	H
1	1.200	15	95	20	105	45	85	80	130
2	2.400	20	105	25	115	50	140	85	190
3	4.800	25	115	32	140	55	145	90	200
4	7.500	32	140	40	150	65	175	110	240
5	9.500	40	150	50	165	75	215	110	290
6	15.000	40	150	50	165	75	215	110	290
7	18.000	50	165	65	185	85	305	110	390
8	35.000	65	185	80	200	95	415	140	510
9	72.000	80	200	125	250	115	432	145	547

Dimensions in millimeters. A and B: bore and flange of the motive connection; C and D: bore and flange of the suction and discharge; E to H: drawing dimensions.

How the 248 ejector works

Motive fluid inlet. Pressurized water, steam, or air leaves the conical nozzle at high velocity.
Suction. The jet creates a vacuum in the mixing chamber that draws in the product (liquid, gas, or solid).
Mixing and discharge. The two fluids mix, recover pressure in the diffuser, and leave through the discharge.

248 ejector installation

The 248 can be installed in several configurations. The datasheet shows these three common layouts.

Installation diagrams

Pump priming. With a non-self-priming pump, the ejector is connected to its supply line; the motive fluid produces suction and the pump starts working.
Water treatment. With motive fluid taken from the pump discharge, the ejector draws the liquid from a tank and adds it to the main pipeline upstream of the pump.
Adding solids. The solid is fed from a container above the suction; the liquid motive fluid carries it along and mixes it in the discharge.

The datasheet diagrams include a valve in the motive fluid line to control ejector operation.

248 ejector technical documentation

PDF

248 datasheetPDF · 2 pages · features, materials, dimensions, and application diagrams

The 248 compared with other Valfonta ejectors and injectors

Models 248 and 250 pump or mix; the 260 and 280 heat liquids with steam.

Model	Function	Motive fluid	Fluid drawn in or heated	Connection and sizes	Body material	Max. P and T
248	Pump and mix	Water, steam, or air	Liquids, solids, or gases	PN16 flanges · DN15–125	WCB, bronze, or CF3M	16 barg / 200 °C
250	Lift liquids	Dry steam or water	Cold, hot, or viscous liquids	BSP thread 3/8″–1½″	Bronze or 316 stainless	16 barg / 200 °C
260	Heat a tank (at the bottom)	Steam	Tank liquid, up to 90 °C	R ½″–1½″ thread · DN15–40	316 stainless	16 barg / 200 °C
280	Heat liquid in-line	Steam	Circulating liquid	PN16 flanges · 25–125 mm ports	WCB or CF3M	16 barg / 200 °C

Data from each model’s datasheet. Models 260 and 280 are grouped under liquid and steam injectors.

Frequently asked questions about the 248 ejector

What motive fluid can the 248 ejector use?

A liquid, usually water, or a gas, usually steam or air. The flow rates in the dimensions table were calculated with motive steam at 4 bar.

What suction lift does it reach?

Submerged in the liquid, it draws a maximum of 2 m with cold water and, with steam at 5 barg, lifts up to 38 m. Not submerged, it reaches 6.5 m suction lift and 5 to 12 m discharge head, depending on steam pressure.

Can it pump solids?

Yes. The liquid motive fluid carries the solid along and mixes it in the discharge, for example cement, common salt, or gels. It can also be used to prepare chemical solutions.

What maintenance does it need?

None: it has no moving parts. For the same reason, it reduces noise and vibration.

What is the difference between the 248 and the 250?

The 248 has DIN PN16 flanges (DN15 to DN125), reaches 72,000 l/h, and handles liquids, solids, and gases. The 250 ejector is threaded (BSP from 3/8″ to 1½″), handles 1,500 to 10,000 l/h, and lifts liquids up to 6 m.