Overview
Certified for critical power industry applications, achieving zero leakage
Vent and Drain Valves
The M4 Series severe service ball valves are specifically designed for isolation in power industry vent and drain valve applications. M4 Series valves are rigorously tested for reliable zero-leakage on/off service in high-pressure, high-temperature steam and superheated steam applications. M4 Series vent and drain valves ensure maintenance-free operation under the most extreme conditions. Bray M4 Series severe service ball valves are ideally suited for conventional coal and combined cycle power generation, nuclear balance of plant applications, cogeneration, boiler drains, feedwater drains, header drains, turbine drains, above and below seat drain ports, superheater vents and drains, drum vents, sootblower isolation, bypass line isolation, economizer header drain applications, and special applications including motor-operated pressure relief valves, sky vents, and special applications available on request. The M4 Series severe service ball valve is designed with advanced technology featuring a 1-piece integral body construction with a heavy-duty drive train, 360° lapped ball and seat with High Velocity Oxygen Fuel (HVOF) and spray-and-fuse hard coating options, and live-loaded packing with Belleville springs. The ball and seat are constructed from the same materials and coatings, ensuring reliable tight shutoff and low seat stress during thermal cycling due to identical thermal expansion rates, as well as maintenance-free operation even in high-cycle applications. M4 Series valves are manufactured at our ISO 9001:2015 facility with full traceability including MTRs, and meet Annex III, PED 97/23/EC Module H, TSG, CRN, and certification requirements, and comply with TDP-1. M4 products are available off-the-shelf for rapid global delivery supporting MRO, turnarounds, planned maintenance intervals, and new plant construction projects.
Quality, Safety & Certification
Zero leakage is defined as no detectable or visible gas or liquid leakage over three minutes or more.
Our facility is ISO 9001:2008 certified for severe service valve design and manufacture.
All pressure-containing components have full traceability.
Technical Specifications
| Item | Value |
|---|---|
| Size Range | NPS ½ to 2½ SW or BW / DN 15 to 65 NPS 3 to 4 BW / DN 80 to 100 |
| Body Material | A105, A182-F22 Cl. 3, A182-F91/F92 |
| Temperature Range | Up to 1100°F (593°C) |
| Stem Material | 431 Stainless Steel/QPQ, Inconel® 718 |
| Maximum Allowable Operating Pressure | ASME CL1700, 3100, 4500 NPS ½ to 2½: Restricted Class, NPS 3 to 4: Standard Class |
| Seat Material | 410 SS/HVOF Chromium Carbide, Inconel® 718 Spray and Fuse Chromium Carbide |
| Shutoff Class | Zero Leakage |
| Ball Material | 410 SS/HVOF Chromium Carbide, Inconel® 718/HVOF Chromium Carbide |
| Bore Size | 0.63”, 1.03”, 1.56” |
| Design Standard | ASME B16.34, Bore per ASME TDP-1, PED |
| End Connections | Socket Weld (ASME B16.11), Butt Weld (ASME B16.25), Flanged, and Special |
| Test Standard | Meets or exceeds API 598, MSS SP 61, or per customer requirements |
| Certifications | CRN, PED, PE(S)R, TSG, TR CU, UA TR |
| Port | Available in Full Size, Reduced, or per ASME TDP-1 |
| Face-to-Face Length | Manufacturer Standard. Custom on request |
| Body Type | One-Piece / Integral |
| Applications | Power Plant Steam Vents and Drains, Steam, Water, and other high-temperature and/or high-pressure clean service isolation or draining |
Features and Benefits
A.
The ball and seat are constructed from the same material and coating composition, both components expand at the same rate during thermal cycling, ensuring reliable tight shutoff. The ball and seat are 360° lapped to create a true spherical interface, eliminating irregularities found in conventional lapping techniques. Wider sealing surfaces reduce dynamic cycle stress, extending valve service life and providing tight shutoff.
B.
Forged thick-wall one-piece construction eliminates body joints and any possibility of body leakage. CNC machined for the highest precision. Transition angles maximize flow velocity.
C.
Increased thickness cast steel bracket provides exceptional rigidity. CNC machined for perfect alignment of body, bracket, and stem, eliminating lateral movement. Permanently fixed bracket.
D.
High-strength one-piece stem with bearing ring. Ensures correct alignment. Extends valve life and maximizes stem packing performance by limiting stem side-loading. Prevents stem blowout.
E.
Rugged ISO 5211 mounting flange supports direct actuator mounting for high-temperature applications or standard adapter mounting.
F.
Inconel® 718 disc springs apply continuous force to the ball and seat, maintaining seal throughout the operating temperature range.
G.
A set of Inconel® 718 disc springs dynamically loads the stem packing to prevent leakage with minimal maintenance.
H.
External body groove effectively dissipates conducted heat during Post Weld Heat Treatment (PWHT).