Керівництво з вибору поворотного клапана для промислової води & Системи ОВК

У промислових системах очищення води та вентиляції, вентиляції та кондиціонування, контроль потоку не є необов’язковим — він важливий. Незалежно від того, чи керуєте ви міською очисною станцією, мережа централізованого охолодження, or a commercial building’s chilled water system, the ability to regulate, isolate, and throttle fluid flow directly impacts system efficiency, energy consumption, and operational reliability. Among the many valve types available, вbutterfly valve stands out as one of the most versatile and cost-effective solutions for industrial flow control.

But with so many options—wafer, вушко, flanged, manual, electric, pneumatic—how do you choose the rightindustrial butterfly valve for your specific application? This guide provides a practical, step-by-step framework for selecting butterfly valves for water treatment and HVAC systems.

What Is a Butterfly Valve?

А butterfly valve is a quarter-turn rotational valve used to regulate or isolate flow in a pipeline.

It is widely used in:

• Water treatment systems
• Трубопроводи ОВК
• Industrial automation systems
• Chemical and process industries

в industrial water treatment і Системи ОВК, butterfly valves are indispensable because they offer:

• Низький перепад тиску when fully open
• Quick operation (quarter-turn = full open/close)
• Легка конструкція compared to gate or globe valves
• Excellent throttling capability for flow modulation
• Lower installation cost due to compact face-to-face dimensions

wafer butterfly valve industrial flow control DN100 cast iron

Working Principle of Butterfly Valve

The valve uses a rotating disc mounted on a shaft. When the disc rotates, it controls flow by opening or blocking the pipeline.

✔ 90° rotation = Full open / close
✔ Partial rotation = Flow regulation

Types of Butterfly Valves for Water & HVAC Applications

Вафельний поворотний клапан

The wafer butterfly valve is the most economical and widely used type. It is designed to fit between two pipe flanges using long bolts that pass through the valve body and both flanges. Key characteristics:

Особливість	Специфікація
монтаж	Between two flanges, no separate bolting
вага	Lightest among all types
Вартість	Most cost-effective
Номінальний тиск	Typically PN10/PN16 (up to PN25)
Size range	DN40 – DN1200
Найкраще для	HVAC, water distribution, general industrial

Limitations: Cannot be used as an end-of-line valve; both sides must be flanged.

wafer butterfly valve DN200 PN16 EPDM seat hand lever industrial

Поворотний клапан

The lug butterfly valve features threaded lugs (ears) around the body perimeter, allowing each side to be bolted independently. This design enables:

• Dead-end service — one side can be disconnected while the other remains pressurized
• Легке обслуговування — no need to drain the entire system
• Higher structural integrity for critical applications

Особливість	Специфікація
монтаж	Independent bolting on each side
вага	Помірний (heavier than wafer)
Вартість	15–25% higher than wafer type
Номінальний тиск	PN10/PN16/PN25, ANSI 150/300
Size range	DN50 – DN600
Найкраще для	Water treatment, pump isolation, end-of-line

lug butterfly valve DN100 CF8M stainless steel PN16 industrial

Поворотний клапан з фланцем

The flanged butterfly valve comes with integral flanges that bolt directly to mating flanges on the pipeline. This type is preferred for:

• High-pressure applications (PN25, PN40, ANSI 300+)
• Large-diameter pipelines (DN300 – DN3000+)
• Critical isolation where zero leakage is required
• Double/triple eccentric designs for metal-to-metal sealing

Особливість	Специфікація
монтаж	Direct bolt-on to pipe flanges
вага	Heaviest
Вартість	Найвищий
Номінальний тиск	PN10–PN40, ANSI 150–600
Size range	DN80 – DN3000+
Найкраще для	Електростанції, хімічний, large HVAC

flanged butterfly valve double eccentric industrial water flow control DN500

Електричний поворотний клапан

An electric butterfly valve integrates an electric actuator with the valve body, enabling remote and automated operation. It is the preferred choice for:

HVAC building automation systems (BAS/BMS integration)

Water treatment plants requiring SCADA control

Processes with frequent cycling or precise positioning needs

Actuator Type	застосування
On/Off (2-position)	Simple open/close, isolation
Modulating (4-20mA)	Точний контроль потоку, throttling
Smart/Bus (Modbus/Profibus)	Full automation, feedback

electric butterfly valve actuator HVAC system temperature control automation

How to Select the Right Butterfly Valve for Your Application

Крок 1 — Define Your Application Requirements

Before selecting a butterfly valve for HVAC system або butterfly valve for water treatment, answer these critical questions:

• What is the fluid medium? — Water, стічні води, хімічні речовини, пара?
• What is the operating pressure and temperature? — This determines body material and seat type
• What is the required flow characteristic? — On/off, throttling, or precise modulation?
• What is the pipe size? — Common sizes: DN50, DN100, DN150, DN200, DN300
• Is automation required? — Manual, pneumatic, або electric actuator butterfly valve system?

Крок 2 — Choose the Right Body & Матеріал диска

матеріал	застосування	Переваги
Чавун (GG25)	вода, HVAC, low-pressure	Економічно вигідний, easy to machine
Ковкий чавун (GGG40)	Higher pressure water	Better strength, стійкість до ударів
Вуглецева сталь (WCB)	пар, масло, газ	High temperature/pressure rated
Нержавіюча сталь (CF8/CF8M)	Корозійні середовища, food/pharma	Corrosion resistant, hygienic
Aluminum Bronze	Морська вода, marine	Чудова стійкість до корозії

Cast iron ductile iron stainless steel butterfly valve material comparison

Крок 3 — Select the Seat Material

The seat material is critical for sealing performance and service life:

Матеріал сидіння	Діапазон температур	Найкраще для	Limitations
EPDM	-40°C до +120 °C	вода, HVAC, озон	Not for oils/greases
NBR (Нітрил)	-30°C to +100°C	Oils, палива, м'які хімікати	Poor ozone resistance
PTFE (Тефлон)	-40°C до +200 °C	Хімічні речовини, харчування, pharma	Lower mechanical strength
Вітон (FKM)	-20°C до +200 °C	Hydrocarbons, high temp	Higher cost
Metal (SS/Ti)	Up to +600°C	пар, high temp, severe service	Higher torque, вартість

Крок 4 — Determine Connection Type & Розмір

для industrial pipeline valve solutions, the connection type must match your piping standard:

Підключення	Стандартний	Common Sizes
вафельний	ISO 5752, API 609	DN50–DN1200
Луг	ISO 5752, MSS SP-67	DN50–DN600
Фланцеві	IN 1092-1, ASME B16.5	DN80–DN3000+

Size selection tip: For water and HVAC, size the valve to match the pipe ID. Oversizing causes poor throttling; undersizing creates excessive pressure drop.

butterfly valve for water treatment wastewater pipeline industrial flow control

Butterfly Valve Додатки in Water Treatment & HVAC

Water Treatment Plants

в очищення води facilities, butterfly valves are used for:

• Raw water intake — Large-diameter flanged butterfly valves (DN500–DN2000)
• Chemical dosing lines — DN50 DN100 butterfly valves with PTFE seats
• Sludge handling — Lug butterfly valves for easy maintenance isolation
• Filtration systems — Electric butterfly valves for automated backwash cycles
• Discharge control — High-performance double-eccentric valves

Системи ОВК

для butterfly valve for HVAC system програми:

• Chilled water loops — Wafer butterfly valves with EPDM seats (DN100–DN400)
• Hot water distribution — Lug butterfly valves for pump isolation
• Cooling towers — Electric actuator butterfly valve systems for BAS integration
• Air handling units (AHU) — Compact wafer valves for space-constrained installations
• Heat exchangers — High-performance valves with precise modulating actuators

Common Mistakes in Butterfly Valve Selection

помилка	Why It’s Wrong	Correct Approach
Ignoring cavitation risk	Damages disc and seat	Size properly, use anti-cavitation trim
Wrong seat for media	Premature failure, витік	Match seat material to fluid compatibility
Undersizing actuator	Valve won’t fully close	Calculate torque including safety factor
Forgetting about end-of-line	Wafer valve cannot isolate	використання lug butterfly valve for dead-end
Neglecting insulation	Condensation, корозії	Specify extended neck for insulation

butterfly valve for water treatment wastewater pipeline industrial flow control

Часті запитання

Q1: What is the difference between wafer and lug butterfly valves?

А: Wafer valves are sandwiched between flanges with through-bolts passing through the entire assembly. They cannot isolate flow from one side. Lug valves have threaded inserts that allow each flange to bolt independently, enabling dead-end service (one-side isolation).

Q2: Which butterfly valve is best for HVAC chilled water systems?

А: For most HVAC chilled water applications, awafer-type concentric butterfly valve with anEPDM seat is the most cost-effective and reliable choice. For automated control, pair it with anelectric actuator with 4-20mA or 0-10V modulating control.

Q3: Can butterfly valves be used for throttling (регулювання потоку) КОНТРОЛЬ?

А: так. Butterfly valves offer excellent control and throttling range for pipes larger than 2.5″ (6.4 cm). All butterfly valves exhibit equal percentage characteristics from 0° to 60° rotation. For precise flow modulation, double-offset or triple-offset designs are preferred.

Q4: What pressure rating do I need for water treatment applications?

А: Municipal water systems typically use PN10 or PN16 (10-16 бар / 145-232 PSI). Industrial applications or high-rise buildings may require PN25 or higher. Always select a valve that meets or exceeds your system’s maximum working pressure.

Q5: What standards should a quality industrial butterfly valve comply with?

А: Quality butterfly valves should comply withAPI 609 (design and testing for butterfly valves), ISO 5752 (face-to-face dimensions), ISO 5211 (actuator mounting), іAPI 607 (fire-safe testing). Look for suppliers withISO 9001 certification and CE/PED compliance.

Why Choose Our Butterfly Valves?

наLuoyang Datang Energy Tech Co., ТОВ. , we are a professionalbutterfly valve supplier dedicated to providing reliableindustrial flow control valve solutions for water treatment, HVAC, fire protection, і промислових трубопровідних систем по всьому світу. Our butterfly valves are manufactured to international standards with certifications including UL/FM, CE, та ISO 9001.

Our Product Advantages：

✔ Stable sealing performance
✔ Wide size range availability
✔ OEM & ODM customization
✔ Compatible with electric actuators
✔ Strict quality inspection before shipment

Зв'яжіться з нами to get a quote now!