Top-Grade Butterfly Valve: Types, Selection, Use Cases & 2026 Maintenance Guide

Basic Working Principle of Butterfly Valve

In practice, Butterfly Valve is a quarter-turn flow control device that regulates, isolates or throttles fluid movement in pipeline systems, it only takes 90-degree rotation of the central disc to complete full open or full close operation, making it far more efficient than linear-stroke gate valves. 2026 on-site field data from municipal pipeline projects shows that properly installed butterfly valves can cut pipeline operation energy consumption by 9% on average.

Q: What are the core components of a standard industrial butterfly valve?

A complete standard butterfly valve consists of 4 core parts: ductile iron valve body, anti-corrosion sealing ring, stainless steel central rotating shaft, and operating handle/electric actuator. All Tianyu Casting butterfly valves use food-grade EPDM sealing material for potable water scenarios to meet global drinking water safety standards.

Q: Can butterfly valves be used for high-viscosity fluid like sewage?

From real project cases, yes. The streamlined disc structure of butterfly valve leaves almost no dead zone for fluid accumulation, so it is very suitable for sewage, mud and other high-viscosity fluid transport scenarios, no frequent blockage will occur during normal operation.

Follow the 3-step process below to install a butterfly valve properly without leakage risk:

1. Align the valve body flange exactly with the pipeline flange and place a matched EPDM sealing gasket between two contact surfaces
2. Tighten flange bolts diagonally with 25-35 Nm torque to avoid uneven stress that causes sealing ring deformation and leakage
3. Test 3 full open-close cycles after installation to confirm the disc rotates smoothly without jamming under nominal pressure

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Main Types of Butterfly Valves for 2026 Industrial Scenarios

Different structural designs of butterfly valves are developed to fit specific working conditions, you can select the most suitable type based on your project parameters directly with the reference table below.

Q: What is the difference between wafer type and lug type butterfly valve?

The wafer type butterfly valve is clamped between two pipeline flanges with through bolts, while the lug type has internal thread lugs fixed on the valve body, it can be installed separately on one end of the pipeline without affecting the other side connection, very suitable for scenarios that require regular disassembly for maintenance.

Q: What working pressure can common butterfly valves withstand?

Standard ductile iron butterfly valves produced by qualified manufacturers can stably work under PN10, PN16 and PN25 pressure levels, high-performance eccentric butterfly valves can even support 4.0MPa working pressure for industrial oil and gas transport scenarios.

The global industrial valve manufacturing industry consensus shows that ductile iron butterfly valves account for 68% of all flow control products used in municipal water pipeline projects as of 2026, for their excellent balance between cost performance and working performance.

Actionable Selection Guidelines For Butterfly Valve Procurement

Improper selection will lead to frequent leakage or premature failure of butterfly valves, the following practical rules summarized by Tianyu Casting after 18 years of production practice can help you avoid 90% of common procurement mistakes.

Q: What sealing material should I choose for different fluid media?

For normal potable water, EPDM sealing is the most cost-effective choice; for weak acid and alkaline fluid, you can choose nitrile rubber (NBR) sealing; for high temperature fluid above 120℃, PTFE sealing material is the only compliant option.

Q: Is ductile iron better than ordinary cast iron for butterfly valve bodies?

Actual pressure resistance test data shows that ductile iron valve body has 3 times higher impact strength and 2 times higher corrosion resistance than ordinary gray cast iron, its service life can be extended by 60% in underground buried pipeline scenarios.

Proven Maintenance Tips To Extend Butterfly Valve Service Life

Even the highest quality butterfly valves need regular inspection to maintain stable working performance, unreasonable maintenance operation is the top cause of unexpected butterfly valve failure in 2026 industry statistics.

Q: How often should I inspect my running butterfly valves?

For general municipal water supply systems, monthly routine inspection of operating status and quarterly full open-close test are enough; for heavy-load industrial pipelines that run 24/7, you need to carry out detailed inspection every 2 weeks to avoid unexpected shutdown loss.

Q: What should I do if my butterfly valve has small sealing leakage?

In most cases, small leakage is caused by tiny hard particles stuck between the disc and sealing ring, you can slowly open and close the valve 2 to 3 times to wash away the particles, no need to disassemble and replace the whole sealing ring immediately.

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