Rotary Ball Float Steam Trap (25NB)

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Why a Float Steam Trap is Essential

Steam systems are the backbone of countless industrial processes—from textile dyeing to food sterilization. However, the presence of condensate can severely reduce thermal efficiency, cause corrosion, and damage equipment through water hammer.

Encon’s Rotary Ball Float Steam Trap (25NB) is designed to solve this by offering immediate, continuous condensate discharge without allowing steam leakage. With only one moving part and a rotary slide valve mechanism, it delivers silent, proportional control that adapts perfectly to fluctuating load conditions. This trap is ideal for users who demand long life, high reliability, and minimal maintenance.

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Continuous, Density-Based Operation

Unlike thermostatic or thermodynamic traps that cycle open and closed, the rotary ball float steam trap offers continuous condensate discharge using a mechanical float system. Here’s how it works:

As steam condenses, hot water (condensate) enters the trap body.
The rising condensate level causes the float to lift.
The float movement turns a rotary slide valve, opening the discharge port.
As the level drops, the float lowers, gradually closing the valve.
This action allows proportional, non-cyclic discharge, ideal for process equipment that requires steady heat transfer.

The trap also includes an air vent and immersion tube, enhancing condensate discharge during cold start-up and blocking live steam from escaping.

Key Features & Benefits

Proportional Condensate Control

No sudden on/off cycling—ensures consistent condensate removal
Maintains heat exchanger efficiency during varying steam loads

Silent, Impact-Free Operation

Rotary valve mechanism eliminates water hammer and noise
No thermal shock to downstream piping or equipment

High Durability, Low Maintenance

Just one moving component—the float and valve system
Simple internal design ensures long service life with minimal wear

Pressure & Temperature Independent

Works effectively even under low differential pressure
Performance remains stable despite upstream or downstream fluctuations

Built-In Air Venting

Automatically removes non-condensable gases during startup
Prevents air binding and improves overall steam system efficiency

Technical Specifications

Parameter	Value
Size	25 NB
End Connections	Screwed (standard)
Max Operating Pressure	12 kg/cm²
Max Temperature	220°C
Cold Hydrostatic Test Pressure	14 bar
Body Material	High-grade steel / CI / SS (custom options available)
Internal Mechanism	Rotary float + slide valve
Special Features	Thermostatic air vent, steam barrier (immersion tube)

Note: Flanged connections or alternate sizes available on request.

Where You Should Use It

The Encon Rotary Ball Float Trap is best suited for equipment that requires constant heat and instant condensate removal, such as:

Heat Exchangers – For steady temperature control
Jacketed Vessels – To prevent steam locking
Coil-type Heaters – Ensures uniform heating in textile & food industries
Sterilizers and Autoclaves – Reduces condensate back-pressure
Pulp & Paper Dryers – For continuous operation with minimal manual intervention
Reboilers & Reactors – Maintains heating efficiency in batch operations

By ensuring complete drainage of condensate, ESPT helps maintain design temperatures and reduces rework or downtime.

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Why Choose Encon’s Rotary Float Trap?

With decades of experience in steam systems, Encon understands the operational challenges industries face. That’s why we developed a trap that not only handles high-pressure condensate but also ensures longevity, easy installation, and minimal service disruption.

Our float trap is: