Valve Comparison Guide
Butterfly Valve vs Gate Valve: Which Is Right for Your Pipeline?
Butterfly valve vs gate valve for pipelines: size, weight, face-to-face (EN 558 vs ASME B16.10), flow restriction, pressure class limits, AWWA vs API service, and cost comparison.
Overview
A butterfly valve uses a disc rotating 90° within the pipe bore. Butterfly valves are significantly lighter and less expensive than gate valves at large bore, with short face-to-face (wafer type) and suitability for DN50 to DN1200 in water, HVAC, and moderate-pressure process service. Triple-offset butterfly valves extend capability to Class 600 metal-seated service.
DN50–DN1200, Class 150–600 (triple-offset), API 609 / AWWA C504 / EN 593
A gate valve provides full-bore isolation with zero pressure drop in the open position. Gate valves handle Class 150 through Class 2500 in alloy steel for high-temperature power and refinery service. OS&Y rising stem provides positive open/closed indication. Heavier and longer than butterfly valves at large bore, but the only option for full-bore piggable and high-temperature alloy steel pipeline service.
DN50–DN900, Class 150–2500, WCB / WC6 / WC9, API 600 / ASME B16.34
Pros & Cons
Butterfly Valve
Gate Valve
Butterfly Valve vs Gate Valve — Specification Comparison
| Parameter | Butterfly Valve | Gate Valve |
|---|---|---|
| Weight at DN600 | ~80–120 kg (wafer butterfly valve) | ~600–900 kg (Class 150 gate valve) |
| Face-to-Face | Short (wafer: ~40–80 mm); EN 558 lug/flanged | Long (ASME B16.10 — significantly longer) |
| Full Bore / Pigging | Not full bore — disc obstructs flow at all times | Full bore — gate retracts completely, piggable |
| Max Pressure Class | Class 150 (concentric/double-offset); Class 600 (triple-offset) | Class 2500 with alloy steel |
| High-Temperature Service | Up to 650°C (triple-offset metal seat) | Up to 650°C (WC9/P91 alloy steel) |
| Cost at DN400 | ~40–60% less expensive than gate valve | Baseline — more expensive at large bore |
| Water Utility Standard | AWWA C504 (rubber-seated butterfly valve) | AWWA C500 (metal-seated gate valve) |
| Oil & Gas Standard | API 609 (butterfly valves) | API 600 / API 6D (gate and pipeline valves) |
| Throttling | Moderate (not precision control) | Not suitable for throttling |
| Operation Speed | Quarter-turn — fast | Multi-turn — slow (gear operator for DN200+) |
When to Use Each
Use Butterfly Valve when:
Use Gate Valve when:
Decision Guide
Choose a butterfly valve for large bore (DN300+) water treatment, water distribution, cooling water, HVAC, and fire suppression service where weight, cost, and compact face-to-face are priorities. Choose a gate valve for oil & gas pipelines requiring full-bore pigging capability, high-pressure Class 300+ service, high-temperature alloy steel steam and power plant applications, and fire protection OS&Y requirements. At DN150 and below, gate valves and butterfly valves are both viable — gate valves dominate process plants and steam service; butterfly valves dominate HVAC and water service. At DN600 and above for water service, AWWA butterfly valves (C504) are the economical standard; for oil & gas pipelines at the same bore, API 6D gate valves or ball valves are specified.
Frequently Asked Questions
Why is butterfly valve cheaper than gate valve at large bore?
Can a butterfly valve replace a gate valve in water supply systems?
What is EN 558 for butterfly valve face-to-face dimensions?
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