Electric Steam Generator

电锅炉蒸汽发生器

Packaged electric steam generator combining feedwater supply, electrode level control, an immersion heating bundle and safety interlocks — dry steam without a fired boiler.

Max medium temperature: 356 °F(180 °C)
Power range: 3 – 45 kW
Voltage: 220 / 380 V, 50 Hz
Sheath material: 304 stainless, 316 stainless, 20# steel
Medium: Water, Steam
Mounting: Free-standing
Tube diameter: 0.472–0.63 in
Pressure rating: 14.5–102 psi

Lead time: 25–40 days
MOQ: 1 unit
Pricing: On application

Design notes

3 to 45 kW packaged units at 220 V or 380 V, 50 Hz

The unit is built from four sub-systems working together. Feedwater is drawn from a tank through a check valve and a solenoid by a multistage pump or, on smaller units, a diaphragm pump; the pump has to develop enough head to push water in against the vessel pressure. Level is held by three electrode probes at different heights — low, medium and high — which start the pump when level falls and stop it when the vessel is full.

Heating is by a seamless-tube immersion bundle inside the shell, one or several elements depending on rating. Surface loading is held around 12 W/cm². As steam is drawn off, pressure falls, the controller re-energises the bundle, and pressure recovers; a pressure gauge and an indicator lamp panel show state at a glance.

The safety chain is what makes the package acceptable to run unattended. The level electrodes cut the heating bundle before the water can fall below the elements. An over-pressure switch and a relief valve limit shell pressure. An exhaust valve prevents air lock on start-up — the manufacturer's notes call out an air-locked vessel as a specific failure case in which the pump cannot inject and the elements are left in a falling water level.

Features

3 – 45 kW at 220 V or 380 V, 50 Hz
Three-electrode level control — low, medium and high
Seamless-tube immersion heating bundle in the shell
Pressure gauge, indicator panel and relief valve
Exhaust valve to prevent start-up air lock

Typical applications

Garment and laundry pressing steam
Food processing, steaming and sterilizing
Small-scale process steam for laboratories and pilot plant
Concrete and autoclave curing
Building and equipment steam cleaning

North American build options

Voltage: 120 / 208 / 240 / 277 / 480 / 600 V @ 60 Hz
Threads: NPT or BSP cut to order
Flanges: ANSI B16.5 150# / 300#
Drawings: Issued in inches on request

These are build options, not stock items — the catalog part numbers above are 50 Hz with metric fine threads. State what you need on the RFQ.

Part numbers & dimensions

10 catalog part numbers in the JGG series

Part number	Voltage	Power
JGG-220/3	220 V	3 kW
JGG-380/6	380 V	6 kW
JGG-380/9	380 V	9 kW
JGG-380/12	380 V	12 kW
JGG-380/15	380 V	15 kW
JGG-380/18	380 V	18 kW
JGG-380/24	380 V	24 kW
JGG-380/30	380 V	30 kW
JGG-380/36	380 V	36 kW
JGG-380/45	380 V	45 kW

Steam output depends on feedwater temperature and working pressure as well as kilowatts. Tell us the steam demand in kg/h and the pressure you need at the point of use and we will size the unit against it.

Minimum order quantity for this series is 1 unit. Dimensions switch between millimetres and inches with the unit toggle in the header.

Full specification

Power range: 3 – 45 kW
Supply: 220 V or 380 V AC, 50 Hz
Heating bundle: Seamless tube, one or more elements by rating
Surface loading: ≈ 12 W/cm²
Level control: Three-electrode probe — low / medium / high
Feed pump: Multistage centrifugal; diaphragm on small units
Protection: Low-level cut-out, over-pressure switch, relief valve
Indication: Pressure gauge and panel indicator lamps
Water quality: Softened feedwater strongly recommended

Questions engineers ask

How do the level electrodes actually control the water?

Three probes are cut to different heights and sense whether water is bridging them to the shell. When level falls off the medium probe the feed pump starts; when water reaches the high probe it stops. The low probe is a safety, not a control — it drops the heating contactor before the water can fall below the elements. The manufacturer notes that electronic level controllers are the more stable of the two types available and suit a wider range of installations than mechanical floats.

Why does the unit need an exhaust valve?

To vent air on start-up. If air is trapped in the shell the feed pump cannot inject against it, so water does not enter while the elements are already energized — the exact condition that destroys an immersion bundle. Opening the exhaust valve until steam appears clears the air and lets the feedwater system work as designed.

Do I need softened feedwater?

Strongly recommended, and effectively mandatory in a hard-water region. Every liter of hard water leaves its carbonate behind on the heating bundle, and that scale insulates the elements until they fail from their own trapped heat. A softener on the feed is far cheaper than an annual bundle replacement plus the downtime around it.

How much steam will a given kilowatt rating produce?

It depends on feedwater temperature and working pressure, so there is no single conversion. Tell us the steam demand in kg/h at the point of use and the pressure you need there, along with your feedwater temperature, and we will size the unit rather than have you back-calculate from kilowatts.

Watt-density figures and temperature limits on this page are design guidance, not warranties. The safe value for your installation depends on the medium, its flow and how the element is mounted — which is why we ask for the duty rather than only the part number.

Commonly specified with