Globe valve sizing ranges from compact ½” models for instrumentation to large 24”+ valves for Udyog-grade fluid control. Correct sizing ensures efficient throttling, minimal pressure drop, and safe flow regulation. Sizing depends on flow rate, system pressure, valve type, and connection standards (threaded, flanged, welded).
Why Valve Sizing Matters in Udhhyog
Improper globe valve sizing can lead to:
Key Parameters in Valve Sizing:
Flow Coefficient (Cv): Flow rate through the valve at 1 psi drop
Operating Pressure & Temperature: Material strength compatibility
Valve Type & Orientation: Z-type, Y-type, angle, etc.
End Connection: Threaded (½”–2”), Flanged (2”–24”+), Welded (special cases)
Standard Globe Valve Sizes
| Nominal Size (Inches) | Common Usage | Connection Type |
|---|
| ½" to 1" | Labs, HVAC, Instruments | Threaded/BSP |
| 1½" to 3" | Building systems, steam traps | Flanged/Threaded |
| 4" to 8" | Water treatment, small power plants | Flanged |
| 10" to 16" | Oil & gas pipelines | Flanged/Welded |
| 18" to 24"+ | Refineries, industrial cooling systems | Welded/Custom Flange |
Size Selection Guide
Step-by-Step:
Define Flow Requirements (GPM or m³/hr)
Calculate Cv Using System Specs
Select Valve Size Matching Cv Chart
Check Industry Standards (ASME, API)
Choose Suitable End Connection Type
Example Cv Calculation
For water @ 60°F with a flow of 100 GPM and ΔP = 4 psi:
So, choose a valve size with Cv ≥ 50 (typically 2.5”–3” globe valve).
Application-Based Sizing Recommendations
| Udyog Industry | Recommended Size | Notes |
| Water Treatment | 4"–10" | Low-pressure throttling |
| Chemical Processing | 2"–6" | Corrosion-resistant materials needed |
| Oil & Gas | 8"–24" | High Cv and pressure tolerance |
| Pharmaceuticals | 1"–2" | Sanitary-grade valves |
| Food & Beverage | 1.5"–4" | Stainless steel, clean-in-place ready |
Industrial Globe Valve Pricing by Size (India)
| Size | Material | Price Range (INR) |
| ½" – 1" | SS/Brass | ₹450 – ₹1,200 |
| 2" – 4" | CI/CS | ₹1,500 – ₹3,800 |
| 6" – 8" | CI/SS | ₹4,000 – ₹7,500 |
| 10" – 16" | CS/SS | ₹8,000 – ₹22,000 |
| 18" – 24"+ | Custom SS/CS | ₹25,000 – ₹55,000+ |
FAQs
What size do globe valves come in?
A: Globe valves are available from ½” up to 24”+ depending on the application. Udyog applications typically require 2” to 16” sizes for effective flow control.
How do I select the right valve size?
A: Calculate your system’s required Cv value based on flow rate and pressure drop, then choose a valve size matching or exceeding that Cv.
What is Cv in globe valve sizing?
A: Cv (flow coefficient) measures the flow capacity of a valve at a pressure drop of 1 psi. It's essential for accurate sizing.
Can I use a larger globe valve for better flow?
A: Oversized valves may lead to poor throttling and unstable control. Always match the size with system requirements.
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