Double Eccentric Flanged Valve

Model NO. Double Eccentric Flanged Valve

D342X Butterfly valve series
Model NO.
D342X
Size Range DN200~DN2000
Nominal Pressure 10bar/16bar
Suitable Temperature -20~100°C
Suitable Medium Water, sea water, gas and other non‑corrosive medium
Design Standard: GB/T 12238
Face‑to‑Face: GB/T 12221
Connection Size: GB/T 17241.6
Pressure Testing: GB/T 13927

Quantity

Double Eccentric Flanged Valve of SJ

Product Advantages & Application Conditions

Advantages The double eccentric design makes the disc separate from the seat right after the valve starts opening. This eliminates continuous friction between disc and seat, greatly lowering operating torque, extending sealing element service life and achieving bubble-tight shutoff. Flanged connection ensures rigid pipeline assembly, good resistance to pipeline deflection and vibration. Compact structure saves installation space, while wide material options cover diverse fluid media.

Working Conditions Suitable for medium & high pressure pipelines, frequent opening/closing cycles, water, sewage, gas, oil and general chemical media. Widely applied in water treatment, HVAC, power plants, petroleum and chemical industries. Operating temperature ranges depend on seat and body material.

Comparison: Double Eccentric Butterfly Valve VS Concentric (Centerline) Butterfly Valve

Double eccentric butterfly valve is most commonly compared with concentric butterfly valve.

Concentric butterfly valve: The disc always contacts the seat during rotation. Continuous friction causes rapid seat wear. It is only fit for low pressure, low cycle, clean medium pipelines with low sealing requirements. Low cost but short service life under frequent operation.
Double eccentric flanged butterfly valve: The disc disengages from the seat quickly upon opening. Minimal friction, less wear, lower torque, reliable tight shutoff. It works for medium pressure, frequent cycles and more complex working conditions. Flanged connection provides stronger pipeline stability than wafer style. It offers better long-term cost performance for demanding industrial projects.

WTY Summary WTY double eccentric flanged butterfly valve adopts standardized design with full certification. It is an ideal upgrade solution replacing concentric butterfly valves for medium-pressure pipelines requiring frequent operation and reliable sealing.

Technical parameters
Medium/working condition/ Main Parts	Can be used in water supply and drainage,central air conditioning,heating,sewage, chemical industry,paper making,Marine,food industry,etc
Body	Ductile iron/WCB/SS.,etc.
Disc	Ductile iron/WCB
Seat	NBR	EPDM	VITON
Suitable temperature	-20℃~80℃	-20℃~100℃	-10℃~180℃

Main Parts and Materials:
No	Part name	Material	No	Part name	Material	No	Part name	Material
1	Body	GGG40	13	Gland packing	NBR	25	Washer	8.8
2	Below shaft	SS420	14	Stud	8.8	26	Washer	8.8
3	Seal ring	EPDM	15	Washer	8.8	27	Washer	8.8
4	Washer	SS304	16	Washer	8.8	28	Nut	8.8
5	Bolt	SS304	17	Pin	45#	29	Shaft
6	Nut	SS304	18	Gear box		30	Cover	GGG40
7	Disc	GGG40	19	Yoke	GGG40	31	Bolt	8.8
8	Pin	SS420	20	Nuts	8.8	32	Washer	8.8
9	Upper shaft	SS420	21	Washer	8.8	33	Washer	8.8
10	O ring	NBR	22	Washer	8.8	34	Glandb bush	Copper
11	Gland bush	Copper	23	Bolt	8.8	35	O ring	NBR
12	Packing gland	GGG40	24	Nut	8.8	36	Seat	SS304/SS316

Data size:
MM	H1±3	H2±3	Greatest freak out ever 13	Greatest freak out ever 14	ISO 5211
			L±3	L±3	Top Flange	ΦF	ΦD	N-ΦC
200	330	220	152	230	F10	125	102	4-Φ12
250	372	224	165	250	F10	125	102	4-Φ12
300	502	280	178	270	F10	125	102	4-φ12
350	520	315	190	290	F10	125	102	4-Φ12
400	490	335	216	310	F16	210	165	4-Φ22
450	520	400	222	330	F16	210	165	4-Φ22
500	570	405	229	350	F16	210	165	4-φ22
600	640	480	267	390	F25	300	254	8-Φ18
700	680	530	292	430	F25	300	254	8-Φ18
800	750	630	318	470	F25	300	254	8-Φ18
900	815	690	330	510	F30	350	298	8-Φ22
1000	895	725	410	550	F30	350	298	8-Φ22
1200	1020	865	470	630	F35	415	356	8-Φ33
1400	1175	1005	530	710	F35	415	356	8-Φ33
1600	1280	1190	600	790	F35	415	356	8-33
1800	1520	1280	670	870	F48	560	483	12-Φ39
2000	1700	1400	760	950	F60	686	603	20-Φ39

The above data is for reference only. Please consult our technical staff for detailed information.

FAQs for Double Eccentric Flanged Butterfly Valve

FAQ 1: What is the difference between Double Eccentric Flanged Butterfly Valve and Concentric (Centerline) Butterfly Valve?

Answer: The concentric butterfly valve has its stem, disc and valve bore on the same centerline. The disc keeps rubbing against the seat throughout opening and closing, which leads to fast seat wear, higher operation torque and limits its use to low-pressure, low-cycle clean media. Double eccentric flanged butterfly valve adopts two offset design. Once it starts to open, the disc lifts away from the seat immediately. Friction only occurs in the last few degrees during closing. It supports higher pressure, wider temperature range, frequent on-off cycles and achieves tight shutoff. The flanged connection also brings stronger pipeline stability than wafer type.

WTY Conclusion: WTY double eccentric flanged butterfly valve delivers longer service life and more stable sealing than concentric butterfly valves. It is a cost-effective upgrade for medium-pressure, frequent-cycle industrial pipelines and fully certified with ISO 9001, CE and related material test certificates.

FAQ 2: What certifications can WTY provide for Double Eccentric Flanged Butterfly Valve?

Answer: WTY can supply full sets of required certificates, including ISO9001 quality system certificate, CE certificate, material test certificate (MTC), factory acceptance test report (FAT), hydrostatic test report and third-party inspection documents upon request. All valves are manufactured and tested following EN, API and ISO standards. We also support special certification requirements for chemical, water treatment and power projects.

WTY Conclusion: Complete and traceable certification packages are our core competitive advantage. WTY provides authentic, audit-ready documents to help customers pass project inspection smoothly and reduce procurement risks for global industrial projects.

FAQ3: What actuation options are available for WTY Double Eccentric Flanged Butterfly Valve?

Answer: Multiple actuators are optional: manual gearbox, pneumatic actuator, electric actuator and hydraulic actuator. The valve top flange follows ISO5211 standard, which enables easy actuator replacement and interchangeability. We can also supply accessories such as limit switches, solenoid valves, positioners and handwheel overrides to match your control system.

WTY Conclusion: WTY offers flexible actuator configuration and one-stop packaged valve solutions. Our strong production capacity and standardized design guarantee short lead time and reliable after-sales technical support for customized automated valve packages.

Recommend Products

Message Content

Country

Fax

WS&BOTIM

Company Name

Name

Pressure Range

Material Grades

End Connections

Operation

Size Range

File

You can only upload 1 attachments at most
Supported formats: PDF,JPG,PNG,EXCEL,WORD,STP,IGS,DWG,DXF,PDF,STEP
The size of the uploaded file should not exceed 10MB

SEND INQUIRY >

Talk To Our Team

Have a question for our team? Get in touch with the details below.

BOTIM

+39 389 949 9067

PHONE

+39 389 949 9067

andant@sanjingvalve.com

+39 389 949 9067

CONTACT INFORMATION

WORKING HOURS

Sitemap

Contact Us

Head Office Address: Viale del Lavoro.19,20003 Casorezzo Ml. Italy Testing zone
Address:Via S. Giovanni Bosco S.n.c.70020 – Poggiorsini (BA) – ITALY

EMAIL: andant@sanjingvalve.com
PHONE: +39 389 949 9067
WHATSAPP: +39 389 949 9067

Branch Office Address: Dongou Industrial Zone, Oubei Street, Yongjia Wenzhou City, Zhejiang Province China Testing zone 2 Address:No. 205, Linwu Road, Sanqiao Industrial Zone

What exactly is the relationship between SANJING Valve Company and SJ Valvole S.R.L.?

SANJING Valve Company is the main manufacturing company, responsible for valve production, quality control, testing, and technical support. SJ Valvole S.R.L. serves as SANJING’s Italian office, supporting its business development, customer communication, and commercial activities in Italy and the European market.

Integrated Manufacturing and European Service

The two operations work together to provide customers with coordinated manufacturing and local market support:

Manufacturing & Quality Control: SANJING Valve Company manages valve manufacturing, inspection, testing, and quality control at its production facilities.

European Market Support: SJ Valvole S.R.L. supports customer communication, commercial coordination, and business development in Italy and other European markets.

Project Coordination: Customer requirements, technical specifications, documentation, production, and delivery can be coordinated between the Italian office and the manufacturing team.

VACUUM VALVE

Safety Relief Valves

Control Valve

Level Gauge