KSB Forged Carbon Steel Globe Valve Class 1500/2500/4500 A105 — High Pressure, Seal Welded

Name: KSB Globe Valve Carbon Steel A105 Class 1500, 2500, 4500
Brand: KSB
Availability: InStock

Specifications

Parameter	Specification
Series	SICCA 1500/2500/4500 GLF
Body Material	A105 / A350 LF2 (Forged Carbon Steel)
Pressure Class	Class 1500, 2500, 4500
Size Range	NPS ¼–2 (DN 8–DN 50)
Max Temperature	425°C (800°F)
Max Pressure	766 bar (11,110 psi) at Class 4500
Design Standard	API 602 (Class 1500), ASME B16.34 (Class 2500/4500)
End Connections	Socket Weld (ASME B16.11), Butt Weld (ASME B16.25)
Bonnet Design	Seal-welded body/bonnet joint
Trim	Integral ST6 hard-faced seat ring
IBR Certified	Check with KSB

✓ Stellite Hard-Faced Seats✓ API 602 (Class 1500), ASME B16.34 (Class 2500/4500)✓ Pressure Seal / Seal Welded

Material & Applications

Why Carbon Steel A105: A105 is cost-effective for high-pressure service where temperatures don’t exceed 425°C. A350 LF2 is the low-temperature variant for service down to -46°C. The seal-welded bonnet provides superior high-pressure integrity compared to bolted designs.

Typical applications: Extreme high-pressure applications: HP bypass systems, high-pressure test manifolds, hydraulic systems, chemical injection, reactor feed lines, and supercritical boiler piping. Class 4500 is one of the highest-rated forged valve classes available.

Pressure/Temperature Ratings

Permissible operating pressures per ASME B16.34:

Rating	Permissible Operating Pressure at Temperature
A105 — 1500	-29 to 38°C: 256 bar	204°C: 219 bar	316°C: 196 bar	425°C: 142 bar
A105 — 2500	-29 to 38°C: 425 bar	204°C: 364 bar	316°C: 326 bar	425°C: 237 bar
A105 — 4500	-29 to 38°C: 766 bar	204°C: 730 bar	316°C: 587 bar	425°C: 426 bar

Dimensions & Weights

Class	NPS	Face-to-Face (mm)	Weight (kg)
1500	1/4	197	3.0
1500	1/2	197	3.0
1500	1	244	5.5
1500	1-1/2	326	11.5
1500	2	360	15.0
2500	1/4	197	3.5
2500	1/2	197	3.5
2500	1	290	7.0
2500	1-1/2	351	12.5
2500	2	378	16.0
4500	1/2	309	11.5
4500	1	348	16.7
4500	1-1/2	444	29.0
4500	2	455	40.3

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

Carbon Steel A105 Globe Valve FAQs

What is a seal-welded bonnet?

In Class 1500 and above, the body-to-bonnet joint is seal-welded instead of bolted. The bonnet is inserted into the body and a circumferential seal weld is applied. This provides added safety at extreme pressures where bolted joints may not be reliable. The weld must be ground and inspected before pressurisation.

What is the maximum pressure for Class 4500?

766 bar (11,110 psi) at ambient temperature for A105. At 425°C, the rating drops to 426 bar (6170 psi). Class 4500 is used in extreme high-pressure applications like HP heater drain systems, chemical injection, and test manifolds.

Is A350 LF2 available?

Yes. A350 LF2 is the low-temperature carbon steel variant, impact-tested for service down to -46°C. Same pressure ratings as A105 but suitable for cryogenic and cold-climate applications. Specify LF2 when minimum design temperature is below 0°C.

Does Class 4500 have a thrust bearing?

Yes, for NPS 1½ and NPS 2 in Class 4500, a thrust bearing is provided to reduce operating torque at extreme pressures. Smaller sizes (NPS ½ to 1) do not require a thrust bearing.

KSB Forged Globe Valve Class 1500/2500/4500 — Carbon Steel A105

Specifications

Material & Applications

Pressure/Temperature Ratings

Dimensions & Weights

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