Bray S70/S90 are two-piece standard-port NPT threaded ball valves, available in sizes from ¼ to 3 inches with 316 stainless steel and WCB carbon steel bodies, respectively. The series features RPTFE seats, pressure ratings up to 2000 psi WOG depending on valve size, a maximum operating temperature of 232°C, and vacuum capability of 29 inches Hg. It is suitable for manual isolation in high-pressure small-bore branch lines, high-temperature process fluids, and oil and gas auxiliary piping in process industries.
S70/S90 Series threaded ball valve
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Bray S70/S90 Two-Piece NPT Threaded Ball Valve, up to 2000 psi WOG
Two-piece NPT threaded ball valve for high-pressure, small-bore branch isolation, available with stainless steel or carbon steel body.
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Specifications
- Size Range
- ¼ - 3" (8 - 80 mm)
- Body Type
- Two-piece
- End Connection
- Threaded - NPT
- Port Type
- Standard port
- Maximum Allowable Operating Pressure
- ¼ - 1": 2000 psi WOG; 1¼ - 2": 1500 psi WOG; 2¼ - 3": 1000 psi WOG
- Operating Temperature Range
- S70: -50°F to 450°F (-46°C to 232°C); S90: -20°F to 450°F (-29°C to 232°C)
- Vacuum Capability
- 29 inHg (gauge)
- Leakage Class
- Zero leakage
- Body Material
- S70: 316 stainless steel; S90: WCB carbon steel
- Ball Material
- ASTM A351 Gr CF8M
- Stem Material
- ASTM A479 Type 316
- Seat Material
- RPTFE
- Design Standard
- MSS SP-110
- Test Standard
- MSS-SP 72
Application scenarios
High-Pressure Small-Bore Branch Isolation in Process Industries
Used for manual on/off control and reliable isolation of small-bore NPT threaded branches in process plants. In sizes from 1/4 to 1 inch, this series has a maximum allowable operating pressure of 2000 psi WOG and features an adjustable packing gland and RPTFE seats.
High-Temperature Process Fluid Line Shutoff
Used for process fluid branch shutoff and maintenance isolation in process industries at temperatures not exceeding 232°C. With a maximum operating temperature of 232°C, RPTFE seats, and a hard chrome-plated ball, this series provides zero-leakage sealing within the specified pressure-temperature range.
Vacuum Equipment Piping Isolation
Used for isolation in industrial vacuum equipment and associated piping. This series provides vacuum capability of 29 inches Hg gauge and is designed for zero-leakage sealing, making it suitable for piping shutoff under vacuum conditions.
Oil and Gas Small-Bore Auxiliary Line Isolation
Used for manual shutoff of small-bore auxiliary lines, equipment connections, or isolation branches in oil and gas facilities. Product literature identifies oil and gas as an application area, and this series is available with 316 stainless steel or WCB carbon steel valve body options.
Selection points
S70 and S90 body materials can be selected based on media conditions
The S70 features a 316 stainless steel body, while the S90 features a WCB carbon steel body. Select the appropriate body material between the two series based on media corrosiveness and service conditions.
Suitable for high-temperature vacuum, zero-leakage applications
This series has a maximum operating temperature of 232°C, a vacuum capability of 29 inHg gauge, and is specified with zero-leakage sealing. It is suitable for applications requiring high-temperature performance, vacuum service, and shutoff sealing.
Hard-chrome-plated ball and RPTFE seats reduce operating torque
This series uses a hard-chrome-plated ball and RPTFE seats. Product documentation indicates that this combination reduces operating torque and extends service life.
Adjustable packing gland supports stem seal adjustment
This series is equipped with an adjustable packing gland to ensure sealing in the stem area. It can be considered a structural feature for applications requiring long-term stem seal maintenance.
Bottom-entry blowout-proof 316 stainless steel stem
This series uses an ASTM A479 Type 316 stainless steel bottom-entry blowout-proof stem, which can be considered a selection feature for applications requiring stem retention under pressure.
Installation & maintenance notes
Verify NPT threaded connection compatibility
This valve uses NPT threaded end connections. Before installation, confirm that the nominal size and thread type of the site piping and adapters match the valve to prevent thread damage or connection leakage caused by forced assembly.
Confirm that the model and operating conditions are within allowable limits
Before installation and commissioning, confirm that the selected S70 or S90 model, actual port size, media, pressure, and temperature conditions do not exceed the specified allowable limits.
Provide adequate handle operating clearance
The installation location must allow normal operation of the valve handle and prevent piping or surrounding structures from obstructing valve operation or use of the safety locking handle.
FAQ
How does the S70/S90 threaded ball valve achieve zero leakage sealing at high temperatures?
Sealing is achieved through the combination of an adjustable packing gland and RTFE seat. The adjustable packing gland helps maintain sealing performance and ensures reliable sealing at high temperatures.
What are the main differences between the S70 and S90 in terms of materials and compatible media?
The S70 has a 316 stainless steel body and is suitable for general-purpose applications. The S90 has a WCB carbon steel body, offers higher corrosion resistance, and is suitable for a broader range of media environments.
What are the operating pressure and temperature ranges of this valve series?
The S70 Series operates from -50°F to 450°F (-46°C to 232°C), while the S90 Series operates from -20°F to 450°F (-29°C to 232°C). Maximum operating pressure varies by valve size; see the rating table on the technical specifications page for details.
What are the seat and ball materials used in the S70/S90 Series valves?
The seat material is RPTFE, the ball material is ASTM A351 Gr CF8M, and the stem material is ASTM A479 Type 316.
How should the port type and size be selected for the S70 and S90?
The size range is ¼-3" (8-80 mm), with threaded-NPT end connections. Final selection should be based on the media, pressure rating, and required valve size. Match the specific model against the specification table according to the actual operating conditions and application requirements.