Double Flanged Butterfly Valve Manufacturer- ZFA Valve

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WCB Body PTFE Seated Flanged Butterfly Valve

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DN800 Two-way Sealing CF8 Disc Flanged Butterfly Valve

Phosphate-double-flanged-high-performance-butterfly-valve

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300LB WCB Flanged Phosphate High Performance Butterfly Valve

double eccentric butterfly valve with gear

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Electric Double Eccentric Butterfly Valve

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Electric Double Flanged Butterfly Valve

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Steel Welded Triple Eccentric Flanged Butterfly Valve

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Worm Gear OP Double Flanged Butterfly Valve

Composition of Double Flanged Butterfly Valve

Vulcanized Seat Double Flg Bfv Valve

Soft Replaceable Seat Double Flg Bfv Valve

Double Flanged Butterfly Valve Dimensions

1. Face to Face(FTF) Dimension

(The series 13 is short pattern of double flanged butterfly valve, while the series 14 is long pattern)

DN	40	50	65	80	100	125	150	200	250	300	350	400	450	500	600	700	800	900	1000	1200	1400	1600	1800	2000
FTF (short)	106	108	112	114	127	140	140	152	165	178	190	216	222	229	267	292	318	330	410	470	530	600	670	760
FTF (long)	140	150	170	180	190	200	210	230	250	270	290	310	330	350	390	430	470	510	550	630	710	790	870	950

Pressure range of butterfly valve double flanged:

ISO, DIN, EN, BS GB/T standard: PN6/PN10/PN16/PN25
ASME/ANSI standard: Class 125/150(150lb)
JIS: 5K/10K.

Note: 1bar≈14.5psi≈0.1MPa≈1kg/cm2.

PN（bar） EN1092-1	MPa	Class ASME b16.34
PN6	0.6	Class 75
PN10	1	≈ Class 125
PN16	1.6	Class 150
PN20	2	≈ Class 150
PN25	2.5	Class 150 / 300
PN40	4	Class 300
PN63	6.3	Class 400
PN100	10	Class 600
PN160	16	Class 900
PN250	25	Class 1500
PN420	42	Class 2500

Double Flanged Butterfly Valve Types

Double flange butterfly valve is a type of butterfly valve that features flanges on both ends of the valve body. The butterfly valve with flange are commonly used in applications where ease of installation and maintenance are crucial. There are different types of double flanged butterfly valves, including:

1. Structure

Centerline Butterfly Valve

The centerline butterfly valve has a symmetrical design. The center of the valve stem and valve disc are consistent. It has a simple structure, is easy to install, and is cost-effective and efficient. It is suitable for general fluid control.

Eccentric Butterfly Valve

Its valve stem is offset from the center of the valve disc, improving sealing performance. Eccentric butterfly valves are often used in applications requiring tighter shutoff.

Single Offset Butterfly Valve

It uses a single offset design to improve sealing performance. Single offset butterfly valves are suitable for applications requiring moderate closing performance.

Double Offset Butterfly Valve

Both the valve stem and disc are offset. This achieves a higher level of sealing and reduces friction. Double offset butterfly valves are suitable for applications requiring high performance.

Triple Offset Butterfly Valve

It includes three offsets. This type of butterfly valve is typically used in applications requiring zero leakage and metal sealing. This includes the chemical and petroleum industries.

2. Valve Seat

Soft Seal:

Soft-Back Seat

It is a type of replaceable valve seat, because it is made of highly elastic rubber(EPDM/NBR).

Vulcanization

The rubber lining in the rubber-lined butterfly valve uses high temperature to vulcanize the rubber and the valve body into one body. This valve seat has very high anti-corrosion properties and is generally used to control some corrosive fluids with strong acid and alkali. The disadvantage is that the valve is disposable and if the vulcanized valve seat is damaged, the entire butterfly valve needs to be replaced.

Hard Seal:

Eccentric type, use body seal or other metal materials such as stainless steel, bronze, graphite etc.

Producing Process of Butterfly Valve Parts

Valve Body of Butterfly Valve

Valve Disc of Butterfly Valve

Soft-backed Seat of Butterfly Valve

Why Choose Us

OEM Service

We are butterfly valve manufacturer since 2006, and we have already provided OEM service for tens of famous customers worldwide. We can provide butterfly valves and valve parts such as the body, seat, disc, and hand lever.

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Technical Support

Installation issues: The more detailed the installation environment provided before the inquiry, the more accurate the product recommendations and installation suggestions can be. Troubleshooting: We have the skills and knowledge to analyze, diagnose, and solve problems encountered when using valves. Maintenance: Regular maintenance and repairs (such as cleaning, inspection, and lubrication of valve parts, etc.) performed by professionals can reduce operating costs. If problems need to be repaired, please contact us. We will provide professional maintenance manuals and remote guidance.

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Valve Warranty

Subject to the conditions and limitations in the warranty, the product is guaranteed to be free from manufacturing errors within 12 months from the date of initial installation or 18 months from shipment defects caused by it. You should report defects and faults to us within 30 days after the fault occurs. If there is no incorrect installation, irregular operation, use environment not as expected, etc., we will ship free replacement spare parts or the same quantity as the faulty product.

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Double Flanged Butterfly Valves Certificates

We are proud of the quality of the double flanged butterfly valves we produce. Superior product quality is our most outstanding advantage. ZFA Valve is committed to consistently providing you with high quality butterfly valve products.

Several authoritative third party organisations have issued product quality certificates for ZFA Valve.

FAQs

Here are short answers to frequently asked questions about our products and services.

Are you a Factory or Trading?

We’re a factory with 20 years production experience, OEM for some customers around the world. You dears can design your own Logo, Packaging etc.

How does a double flanged butterfly valve differ from a lug or wafer butterfly valve?

Double flanged butterfly valves have flanges on both sides. They are for secure bolting and make a strong, rigid connection. In contrast, lug butterfly valves have lugs for bolting but can isolate one side of the pipeline. Wafer butterfly valves are clamped between flanges without lugs or full flanges.

What are the typical applications for double flanged butterfly valves?

Double flanged butterfly valves are used in industries. In addition to being used for Water and wastewater treatment. Also include power generation, chemical processing, oil and gas, and marine.

What types of actuators can be used with double flanged butterfly valves?

Double flanged butterfly valves can be operated dmanually with a lever or gear. Or, automatically with electric, pneumatic, or hydraulic actuators.

What is your After-sales service term?

18 months from shipment or 12 months from installation for all our products.

What is the payment you accept?

T/T best, L/C in sight, West Union, etc.

Can you produce the valve according to my own drawings?

Yes.

Do you accept custom design on size?

Yes.

What is your transportation method?

By sea, by air mainly, we also accept express delivery.