Bray M4 is a ball valve designed for steam venting and draining in severe-service applications, covering NPS ½ to 4 (DN 15 to 100) and available with socket-weld, butt-weld, flanged, and special end connections. Body materials include A105, F22, or F91/F92, with a maximum operating temperature of 593°C and pressure ratings up to ASME CL4500. Featuring zero-leakage sealing, it is suitable for vent and drain points in high-temperature, high-pressure steam systems.
M4 Series Severe Service Ball Valve Product Image
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Bray M4 Severe-Service Steam Vent and Drain Ball Valve
High-temperature, high-pressure steam vent and drain ball valve with socket weld and butt-weld connections
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Specifications
- Size Range
- NPS ½ to 2½ SW/BW (DN 15 to 65), NPS 3 to 4 BW (DN 80 to 100)
- Body Material
- A105, A182-F22 Cl. 3, A182-F91/F92
- Maximum Operating Temperature
- 1100°F (593°C)
- Maximum Allowable Operating Pressure
- ASME CL1700, 3100, 4500 (NPS ½ to 2½: Limited Class, NPS 3 to 4: Standard Class)
- Shutoff Class
- Zero Leakage
- Seat Material
- 410 SS/HVOF chromium carbide, Inconel® 718 spray-and-fused chromium carbide
- Ball Material
- 410 SS/HVOF chromium carbide, Inconel® 718/HVOF chromium carbide
- Stem Material
- 431 stainless steel/QPQ, Inconel® 718
- Bore Diameter
- 0.63", 1.03", 1.56"
- End Connections
- Socket weld (ASME B16.11), butt weld (ASME B16.25), flanged, special
- Design Standards
- ASME B16.34, ASME TDP-1, PED
- Testing Standards
- API 598, MSS SP 61
- Certifications
- CRN, PED, PE(S)R, TSG, TR CU, UA TR
- Body Type
- Integral/One-Piece
- Port Type
- Full port, reduced port, ASME TDP-1
Selection points
Integral Body and Heavy-Duty Drive Design
M4 features an integral body and heavy-duty drive system for high-temperature, high-pressure steam vent and drain isolation service in the power industry.
Matched Hard-Coating System for Ball and Seat
The ball and seat use the same material and hard-coating system, including 410 stainless steel with HVOF chromium carbide or Inconel 718 with chromium carbide coating, for tight shutoff during thermal cycling and reduced seat stress.
Zero-Leakage Isolation for High-Temperature, High-Pressure Steam
M4 is used for on-off isolation of high-pressure, high-temperature steam and superheated steam. It provides zero-leakage shutoff for power plant steam vent and drain applications.
High Pressure Class and High-Temperature Service Capability
M4 has a maximum operating temperature of 593°C and is available in ASME CL1700, CL3100, and CL4500 maximum allowable operating pressure ratings. NPS 1/2 to 2-1/2 is Limited Class, while NPS 3 to 4 is Standard Class.
Multiple End Connections and Port Configurations
M4 is available with socket weld, butt weld, flanged, and special end connections, with full-port, reduced-port, or ASME TDP-1-compliant port options.
Installation & maintenance notes
Keep Piping Clean During Welding and Before Commissioning
This valve is used for isolation or discharge of clean high-temperature and/or high-pressure media. When using socket weld or butt weld connections, prevent welding slag, contaminants, or other foreign matter from entering the valve cavity and sealing areas during installation and before commissioning to protect ball and seat sealing performance.
FAQ
What is the operating principle of M4 Series severe service ball valves?
The M4 Series achieves zero-leakage shutoff under high-temperature, high-pressure steam through an integral body, a 360° lapped ball-to-seat interface, and matching ball and seat materials and coatings. Coordinated thermal expansion of the body and seat maintains a tight seal during thermal cycling.
Which technical factors should be prioritized during selection to ensure zero leakage?
Key considerations include the temperature range, maximum allowable operating pressure, material and coating compatibility between the seat and ball surface, seal rating, end connection type, and whether the design standards meet site operating conditions and applicable certification requirements. The specific configuration must be confirmed according to the actual model and application conditions.
Which typical power plant applications are suitable for this valve series?
Suitable for steam vents and drains, boiler drains, feedwater drains, isolation and venting of steam/high-temperature clean media, as well as applications including upstream/downstream vents, turbine drains, and economizer header vents.
What technical advantages does the M4 Series offer compared with other high-temperature, high-pressure ball valves?
Features include an integral body, thick-wall construction, 360° lapped ball-to-seat interface, components with matching materials and coatings, and Belleville spring packing. These designs improve sealing stability during thermal cycling, reduce seat stress, enable maintenance-free operation, and provide traceability and coverage under multiple certifications.
What standards and recommendations does the manufacturer provide for installation and maintenance?
The valves are designed in accordance with standards such as ASME B16.34 and are compatible with high-temperature actuator installations. Field maintenance is intended to maintain zero leakage; specific maintenance intervals and installation details must be confirmed based on site operating conditions and the selected version.
Documents
Product Brochure - Ball Valve OverviewProduct information · EnglishProduct Brochure - M4 Series Severe Service Ball ValvesProduct information · EnglishIOM Manual - M4 Series Severe Service Ball ValvesManual · EnglishIOM Manual - M4 Series Severe Service Ball ValvesManual · ChineseIOM Manual - M4 Series Severe Service Ball ValvesManual · EnglishIOM Manual - M4 Series Severe Service Ball ValvesManual · EnglishRecommended Specification - M4 Series Severe Service Ball ValvesProduct information · English