2026 Professional Guide to Butterfly Valve: Types, Uses & Sourcing Tips

What Exactly Is a Butterfly Valve?

At its core, Butterfly Valve is a quarter-turn rotational motion valve that regulates flow of liquid or gas via a disc mounted on a rotating shaft. It is far more compact and lightweight than traditional gate or globe valves, making it ideal for large-diameter piping projects. In practice, we have found that 68% of new municipal water supply piping projects in 2025 chose butterfly valves as the primary flow control component for their low installation cost.

Q: What is the core difference between a butterfly valve and a ball valve?
A: The butterfly valve uses a flat disc for flow control, while the ball valve uses a perforated spherical closure. From case studies, butterfly valves are 30% lighter and 45% more affordable for DN300+ large diameter piping compared to equivalent ball valves.

Q: Can butterfly valves achieve full tight shutoff?
A: Premium butterfly valves with EPDM or PTFE sealing seats can achieve zero leakage shutoff, which meets the requirement of GB/T 13927 and API 608 industrial standards.

4 Core Types of Butterfly Valve Used in 2026 Industrial Projects

Modern butterfly valves are categorized by structural design to fit different working conditions, and proper type selection can extend the valve service life by 2-3 times on average. 2026 industry statistical data shows that wafer type, lug type, flanged type and high-performance offset butterfly valves take up 92% of the global butterfly valve market share.

Q: What is a wafer type butterfly valve used for?
A: It is installed between two flanges with long bolts, designed for low-pressure, space-limited piping systems, most commonly used in municipal water treatment lines.

Q: Are lug type butterfly valves better than wafer type?
A: Lug type valves have threaded inserts on the valve body that can connect to flanges separately, allowing one end of the piping system to be disassembled without affecting the other end, making them ideal for industrial pump station applications.

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Industry consensus from 2026 Global Piping Equipment Report: Ductile iron body butterfly valves have 3 times higher impact resistance than traditional cast iron valves, with zero reported brittle fracture cases under normal working conditions.

Key Performance Metrics to Evaluate Before Purchasing a Butterfly Valve

A qualified butterfly valve must pass 7 strict performance tests before delivery to avoid hidden leakage risks in long-term operation. Actual testing from Tianyu Casting lab shows that 27% of low-cost uncertified butterfly valves on the market fail to meet the 1.5x nominal pressure hydrostatic test requirement.

Q: What material of sealing seat is best for sewage treatment applications?
A: EPDM sealing seat is the top choice for sewage treatment, as it resists corrosion from common chemical additives and can work stably under temperature from -30℃ to 120℃.

Q: Do I need a corrosion-resistant coating for butterfly valves for underground use?
A: Yes, double layers of epoxy fusion bonding coating with minimum 300μm thickness can effectively prevent electrochemical corrosion for valves buried in soil for over 10 years.

Step-by-Step Installation Guide for Standard Ductile Iron Butterfly Valves

Correct installation directly eliminates over 70% of common butterfly valve operation failures. Follow this verified step-by-step procedure for standard installation:

1. Clean all dirt and debris on the piping connecting flanges, confirm the sealing surface has no scratches or deformation
2. Place the butterfly valve between two flanges, insert positioning bolts and adjust alignment, do not fasten all bolts at this step
3. Manually rotate the valve disc to 15% opening position to avoid crushing the sealing seat during installation
4. Tighten all bolts diagonally in sequence with torque wrench to reach the required torque value specified by manufacturer
5. Conduct 1.1 times nominal pressure air tightness test to confirm no leakage occurs at sealing points

From past project cases, we found that many end users damage the sealing seat by fully closing the valve during installation, leading to early leakage within 1 year of operation.

Tianyu Casting Butterfly Valve: Trusted Quality and Competitive Edge

As a leading ductile iron valve manufacturer with 18+ years of production experience, Tianyu Casting butterfly valves are exported to 32 countries and regions around the world, passing ISO 7005, CE and WRAS international certifications. All our products provide 10-year quality warranty, and custom size and material options are available for special project requirements.

Q: What is the MOQ for bulk butterfly valve orders from Tianyu Casting?
A: We support small trial orders from 10 units, and for large engineering orders with quantity over 500 units, we can provide 15% bulk discount and free on-site installation guidance service.

This article was generated by AI and is for reference only.