Flange Butterfly Valve|Yuming Valve

Introduction

Product Advantages

1、The structure is simple and compact, the rotation of 90 °is quickly to open and close.

2、All products can provide the pressure test: All Yuming products can provide the pressure test report before leaving the factory.

3、High performance seat rubber: The rubber content is 50%, and the switch life is more than 30000 times. The rubber and valve body are joined by vulcanization process, and the joint is tight and doesn’t fall off;

4、Axial seal: The valve shaft has a double seal structure design of oil seal and O-ring, smaller torque and reliable seal; The upper and lower shaft holes of DN350 and above large diameter valves are designed with packing box structure, and the packing is pressed by the gland to realize sealing.

5、Surface coating: Epoxy powder coating is adopted, with strong adhesion and good weather resistance. It can be used indoors and outdoors.

DATA

DN50--DN350

DN		A	PN16		PN10		150LB		D2	L	B	φD3	φD4	n1-φd1	φD5
			D1	n-φd	D1	n-φd	D1	n-φd
2″	DN50	108	125	4-19	125	4-19	120.7	4-19	90	25	9	65	50	4-8	135
2.5″	DN65	112	145	4-19	145	4-19	139.7	4-19	110	25	9	65	50	4-8	135
3″	DN80	114	160	8-19	160	8-19	152.4	4-19	124	25	9	65	50	4-8	135
4″	DN100	127	180	8-19	180	8-19	190.5	8-19	150	28	11	90	70	4-10	135
5″	DN125	140	210	8-19	210	8-19	215.9	8-22.4	176	28	14	90	70	4-10	135
6″	DN150	140	240	8-23	240	8-23	241.3	8-22.4	200	28	14	90	70	4-10	135
8″	DN200	152	295	12-23	295	8-23	298.5	8-22.4	258	33	17	125	102	4-12	270
10″	DN250	165	355	12-28	350	12-23	362	12-25.4	310	33	22	125	102	4-12	270
12″	DN300	178	410	12-28	400	12-23	431.8	12-25.4	362	33	22	125	102	4-12	270
14″	DN350	190	470	16-28	460	16-23	476.3	12-28.4	421	45	22	125	102	4-12	270

DN400--DN2000

DN		L	PN16		PN10		150LB		H	φd	K	φD2	φD3	n1-φd1	N-b
			D1	n-φd	D1	n-φd	D1	n-φd
16″	DN400	216	525	16-31	515	16-28	539.8	16-28.4	52	33.15	36.2	175	140	4-18	1-10
18″	DN450	222	585	20-31	565	20-28	577.9	16-31.8	52	38	41	175	140	4-18	1-10
20″	DN500	229	650	20-34	620	20-28	635	20-31.8	64	41.15	44.2	175	140	4-18	1-12
24″	DN600	267	770	20-37	725	20-31	749.3	20-35.1	70	50.65	54.7	210	165	4-22	1-16
28″	DN700	292	840	24-37	840	24-31	863.6	28-35.1	95	63.35	71.4	300	254	8-18	2-18
32″	DN800	318	950	24-40	950	24-34	977.9	28-41.1	95	63.35	71.4	300	254	8-18	2-18
36″	DN900	330	1050	28-40	1050	28-34	1085.8	32-41.1	130	75	84	300	254	8-18	2-20
40″	DN1000	410	1170	28-43	1160	28-37	1200.2	36-41.1	130	85	95	300	254	8-18	2-22
48″	DN1200	470	1390	32-49	1380	32-40	1422.4	44-41.1	150	105	117	350	298	8-22	2-28
56″	DN1400	530	1590	36-49	1590	36-44	1651	48-47.8	200	120	134	415	356	8-33	2-32
60″	DN1500	570	1710	36-57	1700	36-44	1759	52-47.8	200	140	156	415	356	8-33	2-36
64″	DN1600	600	1820	40-56	1820	40-50	--	--	200	140	156	415	365	8-33	2-36
72″	DN1800	670	2020	44-56	2020	44-50	2096	60-50.8	280	160	178	475	406	8-40	2-40
80″	DN2000	760	2230	48-62	2230	48-50	--	--	280	160	178	475	406	8-40	2-40

FAQ
Q: Are you a genuine manufacturer or a trading company? Can we inspect the goods at our factory?
A: Yuming Valve Group was established in 1972, with an 82,000㎡ production base, 500+ employees, and its own water treatment butterfly valve production workshop, completing the entire process from casting to finished product in-house. We support third-party inspection and customer on-site inspection, and can provide 3.1 material certificates, PMI spectral analysis, and FAT factory testing documentation. We support online factory visits, and welcome on-site inspections; we can provide factory videos and pictures.

Q: How can I confirm that your products are suitable for my project?
A: Please provide the following information, and the Yuming technical team will provide selection recommendations within 24 hours: media type (clean water/sewage/seawater/circulating water, whether it contains particles or oil), diameter and pressure (DN/PN or Class), temperature range, application (isolation/regulation/dual use), drive method, installation location, project standard requirements, certification requirements, target quantity, and delivery date.

Q: What is the delivery time? How long can expedited delivery take?
A: Standard specifications DN50-DN600: Regular delivery 1-2 weeks, expedited 1 week (stock confirmation required). Larger diameter DN700-DN1200: Regular delivery 1-3 weeks, expedited 4-5 weeks. Non-standard customization: 8-10 weeks, expedited 6-7 weeks. Advance ordering is recommended for project procurement.

Q: Can non-standard diameters or special coatings be customized? What is the minimum order quantity?
A: Yuming Water Treatment Butterfly Valve Workshop supports full-dimensional customization. Diameters can be customized up to DN2000 (project evaluation required), pressure up to PN40, sealing options include PTFE/metal hard seal, butterfly plate options include CF8/CF8M/duplex steel, and drive methods include electric/pneumatic/hydraulic (ISO 5211 interface). Standard specifications require a minimum order of 1 unit; non-standard customization depends on specific circumstances, and bulk project pricing is negotiable.

Q: What are some common butterfly valve malfunctions? How to quickly troubleshoot them?
A: Incomplete closure/internal leakage—most likely due to the butterfly plate not closing fully, foreign objects on the sealing surface, or worn sealing rings. Correct the limit switch → clean the sealing surface → replace the sealing rings. Leakage at the valve stem—loose packing gland or aged packing. Tighten the gland evenly or replace the packing. Jamming during opening and closing—mud buildup in the valve cavity, insufficient oil on the valve stem, or misalignment of the flange. Clean the valve cavity → add grease → straighten the pipeline. Abnormal noise/water hammer during operation—opening and closing speed is too fast. Slow down the actuator speed. Do not force the actuator when jamming occurs; manually test the valve stem first to confirm the cause.

Q: What is the expected service life of a butterfly valve? When do the sealing rings need to be replaced?
A: The expected service life of a soft-seal double eccentric butterfly valve under water treatment conditions is 20-30 years. The sealing ring replacement cycle depends on the operating conditions: 8-10 years for municipal water supply isolation valves, 5-7 years for sewage treatment pipelines, and 3-5 years for pump outlets with frequent opening and closing. Key to extending lifespan: Perform a full open/close operation at least once every 6 months to prevent cold flow adhesion of the sealing ring and valve stem jamming; regularly check for leaks in the valve stem packing; install a pre-filter in wastewater applications to reduce particulate matter erosion.

Q: What is the difference between a double eccentric butterfly valve and a centerline butterfly valve? Which should be chosen for a water treatment project?
A: In a double eccentric butterfly valve, the valve stem axis is offset from both the center of the butterfly plate and the center line of the sealing surface. During opening and closing, the butterfly plate only contacts the valve seat in the last 10°, with the remaining stroke completely separated. This reduces friction by more than 80%, reduces operating torque by 30-35%, and the valve seat life is 2-3 times that of a centerline butterfly valve. Double eccentric valves are chosen for pump outlet isolation in water treatment plants, aeration pipelines in wastewater treatment, and frequent opening and closing conditions; centerline butterfly valves are sufficient for ordinary low-pressure water supply and drainage and budget-sensitive applications.

Q: What is the difference between flanged and wafer-type double eccentric butterfly valves? Which should be chosen for a water treatment project?
A: Flanged valves have flanges on both sides, directly bolted to the pipe flanges, offering high connection strength and allowing for single-sided disassembly and maintenance. They are suitable for large diameters (DN400 and above) and high-pressure applications. Wafer-type valves lack flanges and are fixed by flanges on both sides of the pipe. While compact, they cannot be inspected from one side, and uneven flanges can easily lead to leaks. Flanged valves are recommended for main water treatment pipelines, pump outlets, and applications requiring single-sided maintenance; wafer-type valves are suitable for diameters below DN400, space constraints, and budget-sensitive applications.

Q: Should I choose EPDM or NBR for the sealing ring of a water treatment butterfly valve?
A: EPDM is the preferred choice for water treatment applications. EPDM is wear-resistant, aging-resistant, and steam-resistant, with an applicable temperature range of -40°C to 150°C, making it the best choice for clean water, wastewater, and steam media. NBR has good oil resistance but poor aging resistance, and is only suitable for oily media applications.

Q: How should I choose the butterfly plate material? Which is better, nickel-plated ductile iron or stainless steel?
A: It depends on the corrosiveness of the water. For general clean water and wastewater, ductile iron with nickel plating (DI+Ni) offers the best cost-performance ratio, with a nickel plating layer ≥20μm and passing a 1000-hour salt spray test. For slightly corrosive industrial circulating water, CF8 (SS304) is selected. For seawater desalination and high-chloride water, CF8M (SS316) is chosen. For extreme corrosive conditions, duplex stainless steel is an option. Yuming water treatment butterfly valves come standard with ductile iron nickel-plated butterfly plates, with optional upgrades to CF8/CF8M/duplex steel.

Q: How to choose between ductile iron and carbon steel for the valve body?
A: For water treatment applications, ductile iron is the preferred choice, with a tensile strength ≥400MPa and an FBE epoxy powder coating (250-300μm), offering corrosion resistance for 20-30 years and a significantly better cost-performance ratio than carbon steel. Carbon steel has higher strength but requires additional coating protection and is more expensive, mainly used in high-pressure (>PN25) or high-temperature conditions. Stainless steel valve bodies are suitable for corrosive media, but are more expensive.

Application