Double Eccentric Flange Butterfly Valve

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Double Eccentric Flange Butterfly Valve

Size Range:DN50-DN2000

Body：Ductile Iron, Carbon Steel

Connection Options:Flanged

Working Pressure:PN1.0-2.5MPa

Working Temperature:-40°C to 450°C

Sealing Options: Rubber Seat

Applicable media: fresh water, sea water, oil, and air

Manufacturing Standard:GB/T 122238/AWWA C504、C516/API 609/EN 593/ISO 10631

Product Overview

The Double Eccentric Flange Butterfly Valve is designed for efficient fluid control in various industries, including water treatment, chemical processing, and HVAC systems. Its innovative double eccentric design ensures a smooth sealing process, minimizing friction and wear on the sealing surfaces, resulting in a longer lifespan and more reliable performance.

This valve features a flanged connection, which allows for easy installation and secure integration into pipelines. The double eccentric design ensures that the valve’s disc moves away from the seat when opening, reducing seat wear and preventing any unnecessary friction. The result is a highly efficient, tight shutoff that can withstand a variety of fluid pressures and temperatures.

The double eccentric design helps to improve the flow characteristics, allowing for minimal pressure drop and energy efficiency. The butterfly valve is designed to handle high-volume flow control while maintaining a compact size for installation in confined spaces.

With reliable sealing performance, the Double Eccentric Flange Butterfly Valve is suitable for applications where both flow regulation and reliability are critical. It is commonly used in industries such as oil and gas, water distribution, chemical processing, and marine systems.

Product Features

◇ Specifications and Technical Parameters

DN (mm)	50	80	100	125	150	200	250	300	350	400	450
Rated Flow Coefficient (Kv)	85	225	340	500	770	1360	2130	3060	4160	5450	6900
500	600	700	800	1000	1200	1400	1600	1800	1900	2000
8500	12200	16600	21700	34000	49000	66000	87000	110000	123000	136000

DN (mm)

100

125

150

200

250

300

350

400

450

Rated Flow Coefficient (Kv)

225

340

500

770

1360

2130

3060

4160

5450

6900

500

600

700

800

1000

1200

1400

1600

1800

1900

2000

8500

12200

16600

21700

34000

49000

66000

87000

110000

123000

136000

Parameter	Value
Actuator Model	DKJ
Nominal Pressure (MPa)	0.6
Medium Temperature (°C)	Normal: –20 ~ 200°C (Cast Iron) Low: –40 ~ 250°C (Cast Steel) Medium: –40 ~ 450°C (Stainless Steel)
Corner Scope	Parallel plate: 70°, Inclined plate: 60°
Flow Characteristics	Approximately equal percentage
Connection Method	Flanged (GB/T17241.6, GB/T9113.1 standards)
Action Time (s)	25
Body Material	HT200, 35, WCB, 1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti

◇ Executive Agency Major Technical Parameters

Model	DJK–110	DJK–210	DJK–310	DJK–410	DJK–510
Input Signal	DC 0–10mA, DC 4–20mA
Input Resistance (Ω)	200
Output Angle (°)	90
Output Torque (N·m)	40	100	250	600	1600
Power Supply	200V, 50Hz

◇ Key Performance Indicators

Project	Index Value
Basic Error (%)	±8.0
Backlash (%)	6.0
Dead Area (%)	5.0
Rated Stroke Deviation (%)	±4.0
Allowable Internal Leakage	Parallel plate: ≤ 2 × 10⁻² rated capacity Inclined plate: ≤ 5 × 10⁻³ rated capacity

◇ Permissible Pressure (MPa) with Implementing Agencies

Nominal Diameter DN (mm)	DJK–110 (0°)	DJK–110 (70°)	DJK–210 (0°)	DJK–210 (70°)	DJK–510 (0°)	DJK–510 (70°)
50	28.1	1.948
80	11.0	0.488
100	7.127	0.252
125	3.19	0.128	8.08	0.325
150	2.21	0.075	5.6	0.189
200	0.983	0.031	2.512	0.079
250			4.05	0.103
300			2.33	0.059
350			1.75	0.037
400			2.684	0.060
450			2.120	0.042
500			1.718	0.031
600			0.927	0.0178
700			0.682	0.0098
800					1.14	0.020
1000					0.619	0.0103
1200					0.504	0.016
1400					0.371	0.0106
1600					0.251	0.0076
1800					0.177	0.005
1900					0.151	0.0042
2000					0.129	0.0036

Legend:

0°: Valve fully closed (maximum torque load)
70°: Valve near full open (minimum torque load)
Unit: MPa (Permissible differential pressure)

Specification Parameters

◇ External Dimensions (mm)

DN (mm)	D	D1	A	e	b	L	L1	L2	L3	H1	H2	H3	n–φd	Actuator Model
50		110	245	30	–	60	92	139	357	55	299	270	4–14	DKJ–210
80	125	150	245	30	–	60	92	139	357	62.5	299	270	4–18	DKJ–210
100	145	175	245	30	12	60	102	149	357	72.5	299	270	4–18	DKJ–210
125	175	200	245	30	12	60	117	168	357	87.5	299	270	8–18	DKJ–210
150	200	225	245	30	12	60	130	181	357	100	299	270	8–18	DKJ–210
200	255	280	245	30	12	70	172	221	357	127.5	299	270	8–18	DKJ–210
250	310	335	300	36	14	70	197	258	507	155	340	298	12–18	DKJ–310
300	362	395	300	36	14	80	227	283	507	181	340	298	12–23	DKJ–310
350	412	445	300	36	14	80	252	290	507	205	340	298	12–23	DKJ–310
400	462	495	365	45	16	100	296	348	529	231	400	381	16–23	DKJ–410
450	518	550	365	45	16	100	321	371	529	259	400	381	16–23	DKJ–410
500	558	600	365	45	16	100	346	396	529	284	400	381	16–23	DKJ–410
600	660	685	365	45	16	150	480	418	530	377.5	863	482	20–25	DKJ–410
700	820	420	511	60	25	200	505	531	530	587.5	917	480	28–30	DKJ–510
800	970		420	51	60	200	550	586					28–30	DKJ–510
1000	1175	1120	420	51	60	200	735	721	681				28–30	DKJ–510
1200	1340	1400		/	60	250	980						/	DKJ–610
1400	1520	1575		/	60	300	965	1012					36–30	DKJ–610
1600	1730	1785		/	60	350	1065	1112					36–30	DKJ–610
1800				/	60	25							44–30	DKJ–610
2000		2100	2200	/	60	25	350	1217	1315				/	DKJ–610

Specification Applications

Water and Wastewater Treatment: Ideal for use in water and wastewater treatment plants, where reliable isolation and control of flow are crucial. The double eccentric design minimizes seat wear and provides a tight seal, making it suitable for large-scale operations.
Oil and Gas Industry: The Double Eccentric Butterfly Valve is extensively used in the oil and gas industry for its excellent sealing capabilities, corrosion resistance, and ability to perform in high-pressure conditions. It helps control flow in pipelines, processing plants, and terminal facilities.
Marine and Seawater Applications: The valve’s robust design and ability to withstand harsh environments make it an excellent choice for seawater systems, desalination plants, and other marine applications, where the valve is exposed to corrosive seawater.
HVAC Systems: For managing airflow in HVAC systems, the valve’s compact design and precise flow control make it ideal for heating, ventilation, and air conditioning systems in both commercial and industrial settings.
Power Plants: This valve type is used in power plants for cooling and other critical fluid systems, ensuring that pressure and temperature control remain consistent, even in challenging conditions.
Mining Industry: In mining operations, where large quantities of slurry and other abrasive materials need to be handled, the Double Eccentric Flange Butterfly Valve ensures smooth operation and longevity due to its minimal seat wear and corrosion resistance.
Chemical Processing: In chemical plants, the valve can handle aggressive chemicals, providing reliable isolation and flow control while resisting the corrosive nature of the fluids.

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