The Bray S51 Series consists of two-piece brass, NPT-threaded full-port ball valves in sizes from ¼ to 4 inches, featuring chrome-plated brass balls, PTFE seats, and blowout-proof stems for temperatures from -46°C to 200°C. Suitable for manual shutoff and maintenance isolation in commercial building water systems, low-pressure steam, compressed air, and general oil service branch lines.
Series 51 threaded ball valve product image
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Bray Series 51 S51 Two-Piece Brass NPT Threaded Full-Port Ball Valve
Two-piece brass threaded full-port ball valve for branch isolation in water, steam, oil, and compressed gas service.
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Specifications
- Size range
- ¼ to 4" (8 to 100mm)
- Body material
- Brass
- Operating temperature range
- -50°F to 400°F (-46°C to 200°C)
- Stem material
- Brass
- Maximum operating pressure
- ¼ to 2" 600psi WOG, 150psi WSP; 2½ to 4" 400psi WOG, 150psi WSP
- Seat material
- PTFE
- Tightness class
- Zero leakage
- Ball material
- Chrome-plated brass
- Body type
- Two-piece
- Design standard
- MSS SP-110
- End connection
- Threaded ASME B1.20.1 NPT
- Test standard
- MSS-SP72
- Certifications
- CSA, UL
- Port
- Full port
- Stem design
- Blowout-proof
Application scenarios
Commercial Building Water Branch Isolation
Used for manual shutoff and maintenance isolation of small-diameter threaded water branch lines in commercial buildings. The valve features a two-piece brass body, NPT threaded connections, and a full-port design for general-purpose water systems.
Low-Pressure Steam Auxiliary Line Shutoff
Used for manual isolation and maintenance shutoff of low-pressure steam branch lines and upstream of steam points of use in commercial or industrial facilities. Product documentation explicitly identifies steam as a suitable medium, with a maximum working pressure of 150psi WSP for steam service.
Compressed Air and Compressed Gas Distribution Branch Isolation
Used for manual on/off operation and maintenance isolation of compressed air or compressed gas distribution branch lines in factories. Product documentation explicitly identifies compressed gas as a suitable medium and specifies bubble-tight sealing, adjustable stem packing, and a blowout-proof stem design.
General Oil Transfer Branch Isolation
Used for shutoff and maintenance isolation of general oil transfer branch lines in industrial equipment. Product documentation explicitly identifies oil as a suitable medium, and the valve features PTFE seats and a full-port flow path.
Selection points
Two-piece brass body construction
Two-piece brass body construction is suitable for general fluid systems where ease of maintenance and repair is an important selection consideration.
Full-port chrome-plated brass ball
The full-port design and chrome-plated brass ball reduce flow-path obstruction, making the valve suitable for applications focused on flow capacity and minimizing pressure loss.
Adjustable packing and blowout-proof stem
An adjustable stem packing and bottom-entry blowout-proof stem help control leakage around the stem and prevent stem ejection under line pressure.
Suitability for general fluid media
Suitable for general service media such as water, steam, oil, and compressed gas.
Installation & maintenance notes
Confirm compatibility of threaded connections
The valve ends feature ASME B1.20.1 NPT threaded connections. During installation, confirm that the mating piping and fittings use compatible NPT thread specifications.
Verify media, pressure, and temperature conditions
Before installation, confirm that the actual media, operating pressure, and temperature are within the valve's applicable range. This series is suitable for water, steam, oil, and compressed gas. The operating temperature range is -46°C to 200°C. For 1/4 to 2 inch sizes, the maximum working pressure is 600psi WOG or 150psi WSP; for 2-1/2 to 4 inch sizes, it is 400psi WOG or 150psi WSP.
FAQ
How does the Series 51 threaded ball valve operate?
The Series 51 brass threaded ball valve uses a two-piece construction and opens or closes the flow passage by rotating the ball. The valve features a full-port design and a chrome-plated brass ball, providing low-resistance flow and zero-leakage shutoff.
How should the applicable temperature and pressure ranges be interpreted during selection?
The valve has a temperature range of -46°C to 200°C. Depending on nominal size, the maximum allowable operating pressure is divided into two ranges: ¼ to 2" at 600psi WOG / 150psi WSP, and 2½ to 4" at 400psi WOG / 150psi WSP. The specific configuration must be verified based on the actual model and application conditions.
What are the key features of the Series 51 valve sealing design?
Adjustable stem packing helps prevent leakage through the stem, while a threaded seal with a deep groove simplifies maintenance. The vinyl-insulated handle provides comfortable operation and protects the user.
What operating conditions and media are suitable for this valve?
The valve is suitable for general-purpose service involving oil, water, steam, and compressed gases. Its design emphasizes general low-pressure commercial service for controlling media such as water, steam, and oil. Media compatibility must be verified against the actual operating conditions.
What are the key maintenance considerations for this valve series?
Adjustable stem packing provides reliable sealing, while the bottom-entry, blowout-proof stem design prevents the stem from being ejected under pipeline pressure. Inspect the seals and PTFE seat material regularly for wear, and perform maintenance in accordance with the manufacturer's standards when necessary. Specific maintenance procedures must be confirmed based on site conditions.