Butterfly valves are quarter-turn valves widely utilized in kawalan aliran aplikasi perindustrian.
There are six criteria to be taken into account while selecting an appropriate valve for your project. Being a procurement engineer, you need to assess fluid type, pressure/temperature, valve application, valve dimensions, compatibility with materials, and valve operation method.
ini butterfly valve selection guide gives procurement managers and engineers a clear framework. It covers valve parts, connection types, seat materials, and operating conditions.
What are the Components of a Butterfly Valve?
Each type of butterfly valve has the same five core components. Knowing the different butterfly valve parts prevents specification errors and costly repairs or replacements.
Study the diagram below to help you understand how the different components work:
Butterfly Valve Types by Body and Connection Style
Connection style determines how the valve mounts to your pipeline. It also affects maintenance access and pressure capability.
There are three standard body types, plus two high-performance eccentric designs for demanding service.
Injap Rama-rama Wafer
The injap rama-rama wafer dua bebibir paip diapit. Bolt mengapitnya di tempat.
Ia adalah reka bentuk yang paling ringan dan paling kos efektif. Terbaik untuk rawatan air, pemprosesan makanan, dan talian pemindahan kimia. Walau bagaimanapun, ia tidak sesuai untuk perkhidmatan hujung mati. Kedua-dua bebibir mesti kekal di tempatnya.
Jenis injap ini juga dirujuk sebagai Injap BF. “BF” adalah singkatan untuk “Butterfly.” Walau bagaimanapun, pengeluar yang berbeza mempunyai makna yang berbeza bergantung pada konteks industri mereka.
Injap rama-rama lug mempunyai sisipan berulir dalam badan injap yang menerima bolt dari setiap bebibir secara bebas. Ini membolehkan penyingkiran paip hiliran tanpa mengganggu injap.
Injap lug digunakan di mana akses penyelenggaraan kerap atau di mana pengasingan hujung mati diperlukan.
Injap Rama-Rama Bebibir
Injap rama-rama berbibir mempunyai bebibir integral yang bolt terus ke bebibir paip yang sepadan. Reka bentuk ini mengendalikan penarafan tekanan dan suhu yang lebih tinggi.
Reka bentuk ini lebih disukai untuk kilang penapisan, saluran paip petrokimia, dan proses industri kitaran tinggi.
Reka Bentuk Dwi-Eksentrik dan Tri-Eksentrik
Injap dwi-eksentrik (dwi-sesaran) mengurangkan haus tempat duduk dan sesuai untuk pendikit pada tekanan sehingga Kelas 300.
Injap tri-eksentrik menggunakan pengedap logam-ke-logam. Ia mengendalikan stim, gas asap, dan media kasar pada suhu sehingga 600°C. Injap ini sejajar dengan jenis tempat duduk injap rama-rama yang memerlukan tempat duduk aloi muka keras berbanding bahan elastomer.
Butterfly Valve Seat Types and Seat Material Compatibility Chart
Tempat duduk mencipta pengedap utama antara cakera dan badan injap. Bahan tempat duduk yang salah menyebabkan kegagalan awal, kebocoran, atau pencemaran kimia.
Lima bahan dudukan mencakup sebagian besar aplikasi industri. Masing-masing memiliki batas suhu dan profil kompatibilitas kimia yang ditentukan.
ini bagan kompatibilitas bahan dudukan katup kupu-kupu adalah titik awal. Untuk asam pekat atau layanan media campuran, minta tinjauan kompatibilitas material dari pemasok katup Anda.
Bagan Kompatibilitas Bahan Dudukan Katup Kupu-Kupu
| Seat Material | Kadar suhu | Media yang Kompatibel | Hindari | Kelas Tekanan |
| EPDM | -20°C hingga +120°C | Air, uap, bahan kimia ringan | Minyak, pelarut | PN10–PN16 |
| NBR (Nitrile) | -20°C hingga +80°C | Minyak, gas, bahan bakar | Asam, ozon | PN10–PN16 |
| PTFE | -40°C hingga +180°C | Bahan kimia, asam, media korosif | Abrasives | PN10–PN25 |
| Viton (FKM) | -20°C to +200°C | Solvents, acids, high-temp fluids | Ketones | PN10–PN25 |
| Metal (Stainless / Alloy) | Up to +600°C | Steam, high-temp gas, abrasive slurries | — | Kelas 150–600 |
PTFE seat temperature range: -40°C to +180°C (356°F). PTFE resists virtually all acids, solvents, and corrosive chemicals. It is the standard choice for chemical processing and high-purity pharmaceutical lines.
EPDM is the workhorse seat for water and steam service up to 120°C. NBR handles hydrocarbon media well but degrades quickly in acid or ozone exposure.
Viton (FKM) extends the working ceiling to 200°C. Use it for hot solvents and aggressive chemical service where PTFE seat limitations apply.
Metal seats (stainless or Stellite-overlay alloy) are specified for triple-eccentric valves in high-temperature steam, power generation, and abrasive slurry lines.
Five Key Influences for Right Butterfly Valve Selection
If you want your industrial piping system to run efficiently, follow this checklist for all your projects.
- Fluid Characteristics. Identify temperature, pressure, viscosity, and chemical composition. Confirm whether the media contains solids or abrasive particles. These factors set both body material and seat material requirements.
- Operating Pressure and Pressure Class. Match the valve pressure rating to the system design pressure. Common ratings: PN10, PN16, PN25, Class 150, and Class 300. Always include a safety margin above peak operating pressure.
- Pipeline Size and Flow Rate. Valve bore must match pipe bore. Undersized valves create excessive pressure drop. Oversized valves lose throttling control at low flow.
- End Connection Standard. Confirm the flange drilling pattern: ANSI/ASME B16.5, DIN EN 1092-1, JIS B2220, or BS 4504. Mismatched standards require adapters and create leak points.
- Actuation and Control Requirements. High-cycle or remote-controlled lines need pneumatic or electric actuators with ISO 5211 mounting pads and positioners. Low-cycle manual service uses a handwheel or gear operator.
How to Match Butterfly Valve Specifications to Your Industry
There are very big differences in valve specifications depending on which industry you work in. The same valve type may require different seat, disc, or actuator types.
Below are real-world applications of butterfly valves:
Minyak dan gas
Specify triple-eccentric or mengimbangi berganda valves with metal seats. API 609 compliance is mandatory. Working pressures often reach Class 300 or Class 600.
You may be aware of the XXV valve, which is a safety-critical emergency shutdown valve used in oil & gas, chemical plants, and industrial facilities. The “XXV” designation represents a valve tagging system that clearly reflects function and safety criticality.
Rawatan air
Wafer valves with EPDM seats handle municipal water service. Specify NSF/ANSI 61 certification for potable water contact. Verify leakage class per EN 12266-1.
Pemprosesan Kimia
PTFE-lined or PTFE-seated valves are standard. The PTFE seat temperature range of -40°C to +180°C covers most chemical process lines. Specify a full-bore disc design to eliminate dead legs.
Makanan dan minuman
Seat and disc materials must meet FDA 21 CFR or EU 1935/2004 food-contact compliance. Specify smooth surface finishes (Ra ≤ 0.8 μm) for CIP/SIP cleanability.
HVAC dan Perkhidmatan Bangunan
Wafer valves with EPDM seats cover most chilled water and hot water circuits. Select valves rated for PN10 or PN16. Low weight and compact face-to-face dimensions reduce installation cost.
Kesimpulan
The butterfly valve selection guide helps engineers and procurement teams match the valve to the system.
Fluid medium, temperature, pressure rating, connection type, and actuation type are the factors that shall determine the valve to be used for your application. All these criteria must be met when buying any valves.
Injap Xintai manufactures to ISO 9001 quality management standards. Our products carry CE marking and are manufactured to API, ANSI, DIN, JIS, and BS standards. This means Xintai valves fit international pipeline systems without conversion hardware or custom adapters.
