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KSB Pressure Seal Globe Valve Class 900/1500/2500 — Carbon Steel

A216 WCB/WCC body, Y-pattern, pressure seal bonnet design for high-pressure service. ASME B16.34. Stellite 6 seats. Butt weld ends. NPS 2–8. Up to 425°C. IBR certified. Standard and Special Class ratings available.

Carbon Steel WCB/WCCClass 900, 1500, 2500NPS 2–8 (DN 50–DN 200)

Specifications

ParameterSpecification
SeriesSICCA 900-2500 GLC
Body MaterialA216 WCB / A216 WCC (Cast Carbon Steel)
Pressure ClassClass 900, 1500, 2500
Size RangeNPS 2–8 (DN 50–DN 200)
Max Temperature425°C (800°F)
Max Pressure431 bar (6250 psi)
Design StandardASME B16.34
End ConnectionsButt Weld (ASME B16.25)
Bonnet DesignPressure seal design, non-rotating stem
TrimStellite 6 hard-faced body seat and disc
IBR CertifiedYes (Standard Class)
✓ Stellite Hard-Faced Seats✓ ASME B16.34✓ Pressure Seal / Seal Welded

Material & Applications

Why Carbon Steel WCB/WCC: WCB is suitable for general high-pressure service up to 425°C. WCC offers slightly higher yield strength than WCB at the same temperature range, making it suitable for applications requiring higher mechanical properties. Both grades are widely available and cost-effective for non-corrosive, non-high-temperature service.

Typical applications: High-pressure main steam lines, boiler feedwater, power plant HP/IP/LP systems, refinery high-pressure service, and process piping above Class 600. The Y-pattern body provides streamlined flow with lower pressure drop than straight-pattern designs.

Pressure/Temperature Ratings

Permissible operating pressures per ASME B16.34:

RatingPermissible Operating Pressure at Temperature
WCB — 900-29 to 38°C: 153 bar204°C: 131 bar316°C: 118 bar425°C: 85 bar
WCB — 1500-29 to 38°C: 256 bar204°C: 219 bar316°C: 196 bar425°C: 142 bar
WCB — 2500-29 to 38°C: 425 bar204°C: 364 bar316°C: 326 bar425°C: 237 bar
WCC — 900-29 to 38°C: 155 bar204°C: 145 bar316°C: 125 bar425°C: 85 bar
WCC — 1500-29 to 38°C: 258 bar204°C: 242 bar316°C: 208 bar425°C: 141 bar
WCC — 2500-29 to 38°C: 431 bar204°C: 404 bar316°C: 347 bar425°C: 236 bar

Dimensions & Weights

ClassNPSFace-to-Face (mm)Weight (kg)
900249040
900360075
9004685105
9006925230
90081090380
1500256575
1500363095
15004765170
150061025380
2500256085
25003675145
25004765210
250061030485

Weights are approximate. Dimensions for flanged ends where applicable. Contact us for butt weld dimensions.

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Other Globe Valve Materials

Alloy Steel WC6/WC9/C12A — Class 900/1500/2500 Carbon Steel WCB — Class 150/300/600 (bolted bonnet) Forged Carbon Steel — Class 1500/2500/4500 All Globe Valves →

Service & Spares

Seat lapping, packing replacement, and genuine KSB spares for globe valves.

Repair Service → Genuine Spares →

Service Area

Pune, Ahmednagar & Beed, Maharashtra.

Carbon Steel WCB/WCC Globe Valve FAQs

What is a pressure seal globe valve?
A pressure seal valve uses the internal pressure of the fluid to seal the bonnet joint. As pressure increases, the seal gets tighter — the opposite of bolted bonnet designs where higher pressure tries to force the joint open. This makes pressure seal valves ideal for Class 900 and above where bolted bonnet designs become impractical.
What is the difference between Standard Class and Special Class?
Standard Class follows ASME B16.34 standard pressure/temperature ratings. Special Class has higher ratings — the valve can handle higher pressures at intermediate temperatures. For example, WCB Class 900 Standard is 153 bar at ambient; Special Class is 155 bar. The difference is more significant at elevated temperatures. Specify Special Class for applications operating near the P/T limit.
Why Y-pattern instead of straight?
Y-pattern (angled body) provides a streamlined flow path with lower pressure drop than straight-pattern globe valves. This is important in high-pressure systems where pressure recovery is critical. The SICCA 900-2500 GLC is always Y-pattern.
What is the difference between WCB and WCC?
Both are carbon steel casting grades. WCC has slightly higher tensile and yield strength than WCB, and a tighter carbon range. WCC is sometimes specified when higher mechanical properties are needed. Both have the same temperature limit of 425°C.

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