The Spirax Sarco BT6-B hygienic balanced pressure steam trap, available in BT6-BL and BT6-BH models, features a 316L stainless steel body and ASME BPE hygienic clamp connections. With a maximum operating pressure of 6 barg on saturated steam, it is suitable for automatic condensate drainage from CIP/SIP circuits, steam sterilizers, and low points in clean steam mains.
Spirax Sarco BT6-B Clean Steam Trap, Open View
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BT6-B Clean Steam Trap | Spirax Sarco
Hygienic balanced pressure steam trap for automatic condensate drainage from CIP/SIP circuits and sterilization equipment, with hygienic clamp connections.
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Models
BT6-BL and BT6-BH belong to the Spirax Sarco BT6-B sanitary balanced-pressure steam trap series. BT6-BL is the low-capacity model and BT6-BH is the high-capacity model. Both share 316L construction, ASME BPE hygienic clamp connections, and the same pressure-temperature limits; final selection should still be confirmed against manufacturer capacity curves for the condensate load and operating differential pressure.
BT6-BLBT6-BL Clean Pressure-Balanced Steam Trap
BT6-BL belongs to the Spirax Sarco BT6-B clean pressure-balanced steam trap series. The product features an ASTM A276 316L valve body and an AISI 316L temperature-sensing element, with 1/2 inch, 3/4 inch, 1 inch, or 1 1/2 inch ASME BPE hygienic clamp connections. The valve body design rating is PN10, the maximum operating pressure for saturated steam is 6 barg, and the maximum operating temperature is 165°C@6 barg. Internal surface roughness is 0.6 μm Ra, with optional electropolishing to 0.375 μm Ra. It must be installed vertically with downward flow for self-draining. At steam pressures not exceeding 2.5 barg, condensate discharge subcooling is below 2°C. Capacity rating (low for BL / high for BH) should be confirmed against the manufacturer capacity curves for the condensate load and differential pressure.
BT6-BHBT6-BH Clean Pressure-Balanced Steam Trap
BT6-BH belongs to the Spirax Sarco BT6-B clean pressure-balanced steam trap series. The product features an ASTM A276 316L valve body and an AISI 316L temperature-sensing element, with 1/2 inch, 3/4 inch, 1 inch, or 1 1/2 inch ASME BPE hygienic clamp connections. The valve body design rating is PN10, the maximum operating pressure for saturated steam is 6 barg, and the maximum operating temperature is 165°C@6 barg. Internal surface roughness is 0.6 μm Ra, with optional electropolishing to 0.375 μm Ra. It must be installed vertically with downward flow for self-draining. At steam pressures not exceeding 2.5 barg, condensate discharge subcooling is below 2°C. Capacity rating (low for BL / high for BH) should be confirmed against the manufacturer capacity curves for the condensate load and differential pressure.
Specifications
- Body Design Rating
- PN10
- Maximum Allowable Pressure (PMA)
- 10 barg @ 140°C
- Maximum Allowable Temperature (TMA)
- 177°C @ 9.2 barg
- Minimum Allowable Temperature
- -254°C
- Maximum Operating Pressure for Saturated Steam (PMO)
- 6 barg
- Maximum Operating Temperature (TMO)
- 165°C @ 6 barg
- Minimum Operating Temperature
- 0°C
- Maximum Design Cold Hydraulic Test Pressure
- 15 barg
- Pipe Connections
- 1/2 in, 3/4 in, 1 in, 1 1/2 in ASME BPE sanitary clamp connections
- Body Material
- ASTM A276 316L
- Thermostatic Element Material
- AISI 316L
- Seal Material
- Tuf-steel® (PTFE + AISI 316), optional PTFE-encapsulated Viton
- Internal Surface Roughness
- 0.6 μm Ra (25 μin)
- External Surface Roughness
- 1.0 μm Ra (40 μin)
- Optional Electropolished Internal Surface
- 0.375 μm Ra (15 μin)
- Standards Compliance
- ASME BPE, 2014/68/EU
- Seal Certifications
- FDA CFR 21 Part 177.1550, USP Class VI
- Animal-Derived Ingredients
- None (ADI)
- Condensate Discharge Subcooling
- <2°C (steam pressure <=2.5 barg)
- Installation Orientation
- Vertical, downward flow, self-draining
Application scenarios
Condensate Drainage from CIP/SIP Systems
For CIP/SIP circuits in clean and high-purity systems, discharging condensate generated during steam cleaning or sterilization-in-place. The product has a 316L stainless steel body and ASME BPE sanitary clamp connections. It must be installed vertically with downward flow to ensure self-draining.
Condensate Drainage from Steam Sterilizers
For discharging condensate generated during the sterilization cycle of steam sterilizers. The product documentation specifically states that it can be used with sterilizers. Its thermostatic element responds to condensate temperature, and in typical clean applications with steam pressure no higher than 2.5 barg, condensate is discharged at less than 2°C below the saturated steam temperature.
Low-Point Drainage of Clean Steam Mains
Installed at low points in clean steam mains or branch lines to discharge condensate generated and accumulated during steam distribution. The product documentation specifically states that it can be used for steam main drainage, and it features a 316L stainless steel body with sanitary clamp connections.
Selection points
Low-Subcooling Discharge
At steam pressures no higher than 2.5 barg, condensate discharge subcooling is less than 2°C. This allows condensate to be discharged close to the saturated steam temperature and is suitable for clean steam or SIP applications with stringent discharge-temperature requirements.
Sanitary Surface Finish and Electropolishing Option
The internal body surface has a roughness of 0.6 μm Ra and can optionally be electropolished to 0.375 μm Ra, meeting sanitary surface-finish selection requirements.
Seal Material Compliance and Absence of Animal-Derived Ingredients
The seals comply with FDA CFR 21 Part 177.1550 and USP Class VI requirements and are declared free of animal-derived ingredients, making them suitable for clean processes requiring confirmation of material compliance.
Self-Draining Installation with Vertical Downward Flow
The product must be installed vertically with downward flow to provide self-draining performance. The specified installation orientation must be considered during product selection.
ASME BPE Sanitary Clamp Connections
ASME BPE sanitary clamp connections are available in 1/2 in, 3/4 in, 1 in, and 1 1/2 in sizes for clean steam systems using the corresponding sanitary piping interfaces.
Clean Steam Pressure and Temperature Limits
The body design rating is PN10, the maximum operating pressure for saturated steam is 6 barg, and the maximum operating temperature is 165°C @ 6 barg. Actual pressure and temperature conditions must be verified during product selection.
Installation & maintenance notes
Install Vertically with Downward Flow
The steam trap must be installed vertically with the process medium flowing downward to ensure self-draining.
FAQ
How does the BT6-B sanitary balanced pressure thermostatic steam trap work?
The BT6-B operates on the balanced pressure thermostatic principle. Its core component is a stainless steel capsule filled with a temperature-sensitive fluid. When cold or during startup, the valve is fully open to discharge air, condensate, and CIP fluids. As the system temperature approaches the saturated steam temperature, the fluid inside the capsule expands and closes the valve, reducing steam leakage while maintaining effective condensate drainage.
What applications is the BT6-B suitable for?
The BT6-B provides condensate drainage in clean and high-purity systems. It is suitable for sterilizers, steam main drainage, CIP/SIP systems, and process piping.
What is the difference between the BT6-BL and BT6-BH?
The BT6-BL is the low-capacity model, while the BT6-BH is the high-capacity model. The specific configuration must be confirmed according to the actual model and application conditions.
What are the installation requirements for the BT6-B?
The BT6-B must be installed vertically with downward flow to ensure that the body is self-draining. During installation, verify the flow-direction arrow on the body. A cooling leg must be provided upstream to prevent condensate from backing up into the process equipment, and the thermostatic element must not be exposed to superheated conditions. Gaskets and installation clamps are not supplied with the product.
What sizes, connection types, and spare parts are available for the BT6-B?
Available sizes are 1/2 in, 3/4 in, 1 in, and 1 1/2 in. The standard connection type is an ASME BPE sanitary clamp. Available spare parts include the thermostatic element, sealing ring, and lower body with valve seat. Specify the size and model when ordering spare parts.
Documents
BT6-B Sanitary Balanced Pressure Thermostatic Steam TrapDatasheet · ChineseBT6-B and BT6-B Food+ Sanitary Balanced Pressure Thermostatic Steam Trap Installation and Maintenance InstructionsManual · EnglishBT6-B and BT6-B Food+ Sanitary Balanced Pressure Thermostatic Steam Trap Installation and Maintenance InstructionsManual · Chinese