Product details
Weiss Pigtail Syphon | SY-14B | 1/4″ NPT | Brass
Product Description
The SY-14B is a “pigtail” or loop-style syphon designed to create a cooling zone between the process line and the pressure gauge. The “SY” stands for Syphon, the “14” identifies the 1/4″ NPT connection size, and the “B” confirms the material is Brass.
While iron and stainless steel syphons are common in heavy industrial steam, the brass syphon is the preferred choice for low-pressure steam boilers, humidifiers, and non-corrosive vapor lines. Its primary function is to trap condensed water in the loop, forming a “water seal.” This seal prevents hot steam from directly contacting the internal Bourdon tube of the pressure gauge. By keeping the gauge at ambient temperature, the SY-14B prevents thermal damage and eliminates measurement errors caused by heat.
Key Features
- High-Quality Brass Construction: Offers excellent resistance to corrosion in freshwater and non-corrosive steam environments common in commercial HVAC.
- Effective Thermal Buffer: The coiled pigtail design allows steam to condense and form a protective water trap for the gauge.
- Corrosion Resistance: Superior to iron syphons in humid environments, as brass does not rust, ensuring a clean connection over time.
- 1/4″ NPT Standard Connection: Features male threads for a universal fit with industrial pressure gauges and standard piping ports.
- Compact and Reliable: Provides essential instrument protection in a compact form factor suitable for equipment skids and small boiler manifolds.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | SY-14B |
| Material | Brass |
| Type | Pigtail (Loop) Syphon |
| Connection Size | 1/4″ NPT |
| Max Working Pressure | Up to 250 PSI |
| Max Temperature | Suitable for low-to-medium pressure steam |
| Application | Commercial Boilers, Humidifiers, HVAC |
Frequently Asked Questions
- Q: When should I choose Brass (SY-14B) over Iron?
- A: Brass is better for systems where rust from an iron syphon might clog small orifices or where the aesthetics of a non-rusting component are preferred. It is ideal for commercial HVAC and clean steam applications.
- Q: Does it work for hot water?
- A: Yes, it can be used for very hot water to provide a small amount of cooling and vibration dampening before the water reaches the gauge, though its primary design is for steam.
- Q: How do I install it correctly?
- A: For the best protection, fill the loop with water before you screw the pressure gauge onto the syphon. This ensures the water seal is present immediately upon system startup.
