Bray S20/FS20 is a one-piece reduced-port NPT threaded stainless steel ball valve for ¼ to 2 in. piping, with both the body and ball made of CF8M stainless steel. Rated to 2000 psi WOG and suitable for temperatures from -46°C to 232°C, it features a bottom-mounted blowout-proof stem and live-loaded packing to meet zero-leakage requirements. FS20 is equipped with fire-safe certification, anti-static grounding, and adjustable graphite packing for applications requiring resistance to acid gas.
S20/FS20 Series
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Bray S20/FS20 Threaded Stainless Steel Ball Valve
Stainless steel reduced-port threaded ball valve for sour gas service, with optional API 607 fire-safe certification.
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Specifications
- Valve Type
- One-piece reduced-port threaded ball valve
- Size Range
- ¼ - 2"（8 - 50 mm）
- Maximum Allowable Operating Pressure
- 2000 psi WOG（137 bar）
- Operating Temperature Range
- -50°F to 450°F（-46°C to 232°C）
- End Connection
- NPT threaded
- Body Material
- ASTM A351 Gr CF8M
- Ball Material
- ASTM A351 Gr CF8M
- Seat Material
- S20: RPTFE; FS20: FPTFE
- Leakage Class
- Zero leakage
- Design Standard
- MSS SP-110
- Test Standard
- MSS-SP 72
- Sour Gas Service Standard
- NACE MR0175
- Fire-Safe Certification
- FS20: API 607 7th Edition
- Anti-Static Device
- FS20 is equipped with grounding between the ball, stem, and body
- Stem Design
- Bottom-entry blowout-proof stem
- Stem Packing
- Live-loaded self-adjusting packing; FS20 features adjustable graphite packing
- Port Configuration
- Reduced port
Selection points
One-Piece Reduced-Bore Body and Serviceable Sealing Design
This series features a one-piece reduced-bore valve body that minimizes potential leak paths and allows replacement of seats and seals, making it suitable for NPT threaded piping where sealing-path control and maintenance convenience are priorities.
NACE MR0175 Compliance for Sour Gas Service
The S20 and FS20 series comply with NACE MR0175 requirements and can be selected for sour gas containing H2S and other corrosive service conditions.
FS20 Fire-Safe Certification and Post-Fire Metal Sealing
The FS20 model is certified to API 607 7th Edition. If fire damages the primary soft seat, the ball can form a metal-to-metal seal with the backup metal seat, supporting applications that require evaluation of sealing continuity after a fire.
Blowout-Proof Stem and Live-Loaded Self-Adjusting Packing
The S20 and FS20 feature a bottom-entry blowout-proof stem and live-loaded self-adjusting stem packing to compensate for wear and temperature changes, helping maintain stem sealing and operating performance.
Installation & maintenance notes
Verify NPT Threaded Connection Compatibility
This valve series uses NPT threaded end connections. During installation, verify that the field piping and mating fittings are compatible with the NPT threaded ends to prevent connection leaks or thread damage caused by thread incompatibility or improper assembly.
Verify Pressure and Temperature Operating Ranges
Before installation and operation, confirm that actual operating conditions do not exceed the valve's specified temperature range and maximum allowable operating pressure. This series has an operating temperature range of -46°C to 232°C and a maximum allowable operating pressure of 2000 psi WOG or 137 bar.
Select FS20 Models for Fire-Safe Applications
For applications with fire-safe requirements, confirm selection of the FS20 model. Product documentation indicates that the FS20 is certified to API 607 7th Edition; a standard S20 must not be used as an FS20 fire-safe configuration.
FAQ
What is the operating principle of S20/FS20 threaded ball valves?
This series features a one-piece body design and opens or closes the media passage by rotating the ball within the valve body. RPTFE seats and the sealing design provide low leakage, making the valves suitable for general-service media such as air, water, and oil and gas.
How should S20/FS20 valves be selected, and what factors should be considered?
Key considerations include the size range (¼–2"), temperature range (-46°C to 232°C), maximum operating pressure (137 bar), and NPT end connection threads. For high-temperature fire-safe service, select FS20 and consider NACE MR0175 environmental suitability. The specific configuration must be confirmed according to the actual model and application conditions.
What are the differences between FS20 and S20 in fire safety and corrosion resistance?
FS20 is a fire-safe certified threaded ball valve for high-temperature and fire-safe applications. S20 is a standard one-piece-body valve with NACE MR0175-related corrosion resistance, but it may not have fire-safe certification.
What advantages does this valve offer in highly corrosive environments?
The valve body is investment-cast stainless steel with full traceability, RPTFE seats, and suitability for NACE MR0175 service. It can resist sour gas environments and risks of corrosion and stress corrosion cracking caused by SSC.
What are the key considerations for installation and maintenance?
The one-piece construction reduces potential leakage paths and simplifies maintenance. A bottom-entry blowout-proof stem and self-adjusting stem packing automatically compensate for wear and temperature changes, maintaining low operating torque and long cycle life. The specific maintenance plan must be confirmed according to the actual model and operating conditions.