Materials of Construction (MOC)
| Component | Material Specification |
|---|---|
| Body & Bonnet | Ductile Iron (ASTM A536 / EN-GJS-400-15) |
| Stem / Spindle | SS 410 / SS 420 |
| Seat / Trim | EPDM / NBR / Bronze |
Technical Specifications
| Parameter | Specification / Standard |
|---|---|
| Manufacturing / Design Standard | EN 1171 / AWWA C509 / BS 5163 |
| Testing Standard | API 598 / EN 12266-1 |
| Pressure Rating | PN16 / PN25 |
Features & Benefits
Pressure Seal Bonnet
Bonnet seal gasket is compressed by internal line pressure -- the higher the pressure, the tighter the seal. Eliminates leak paths common in bolted bonnet designs at high pressure (Class 900 to Class 2500) where bolt load alone is insufficient to maintain a tight joint.
Y-Pattern Low Pressure Drop
45-degree Y-pattern body provides 40--60% lower pressure drop than equivalent T-pattern globe valves, reducing pumping energy and erosion while maintaining good throttling characteristics in high-pressure steam service.
Stellite Seat Overlay
Stellite 6 hard-facing on both disc and seat resists erosion and galling at high velocity and high temperature, extending trim life in severe high-pressure steam and process service.
Backseat Design
Stem backseat allows packing replacement while the valve is under pressure, improving maintenance safety and reducing downtime in critical high-pressure systems.
Anti-Blowout Stem
Stem is retained by the pressure seal bonnet geometry and cannot be ejected under pressure, meeting API 600 safety requirements for high-pressure service.
Live-Loaded Packing
Graphite braided packing with live-loading disc springs maintains seal compression during thermal cycling, preventing leakage during start-up and shutdown in high-temperature steam headers.