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U-section Butterfly Valve

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U-Section Butterfly Valve Manufacturer

Laux Valve produces heavy-duty U-Section Butterfly Valves built for precise flange alignment, bubble-tight sealing and extended service life.

Featuring a distinctive U-shaped body construction, these valves deliver superior mounting stability and effectively minimize pipeline stress. Widely specified for municipal water infrastructure, water treatment, HVAC systems and general industrial processes.

Our U-section butterfly valves support manual, electric and pneumatic actuator configurations. Custom OEM solutions are available to meet unique project flow control requirements.

U-Type Butterfly Valve manufacturer in China

U-section Butterfly Valve

Q: What is a U-Section Butterfly Valve?

A U-Section Butterfly Valve, also known as a U-Type Butterfly Valve, is a resilient seated butterfly valve with an extended U-shaped body designed for installation between pipeline flanges. The U-shaped profile improves valve alignment, enhances sealing stability, and distributes flange bolt loads more evenly than a standard wafer butterfly valve. It is widely used in water treatment, HVAC, municipal water supply, and industrial pipeline systems.

Q: What is the difference between a U-Type and Wafer Butterfly Valve?

Both valves are installed between flanges, but a U-Type Butterfly Valve features a deeper U-shaped body that provides better flange positioning and improved sealing stability. Compared with a standard wafer butterfly valve, the U-section design reduces installation stress on the seat and offers better performance in large-diameter or frequently maintained pipeline systems.

Q: Can a U-Type Butterfly Valve be installed at the end of a pipeline?

Most U-Type Butterfly Valves are intended for installation between mating flanges. End-of-line service depends on the valve design, pressure rating, and manufacturer's specifications. If end-of-line isolation is required, a lug butterfly valve is often the preferred solution.

Q: Which industries commonly use U-Type Butterfly Valves?

U-Section Butterfly Valves are widely used in municipal water supply, wastewater treatment, HVAC systems, industrial utilities, chemical processing, marine engineering, food processing, irrigation, and general industrial pipeline applications.

Q: What pressure ratings are available?

Standard pressure ratings include PN10, PN16, ANSI Class 150, and other ratings upon request. Valve selection should be based on the operating pressure, temperature, and pipeline design.

Q: Can it be automated with electric actuators?

Yes. Laux U-Section Butterfly Valves are designed with an ISO 5211 mounting pad, making them compatible with manual gear operators, pneumatic actuators, and electric actuators for automated flow control.

Q: Is it suitable for throttling service?

Yes. U-Type Butterfly Valves can be used for both on/off isolation and moderate flow regulation. For precise throttling or severe control applications, our engineering team can recommend the most suitable valve configuration.

U-Section Butterfly Valve from Laux Valve, a professional valve maker established in 2011. This replaceable soft-seat butterfly valve ranges DN50-DN1400 (2"–56"), complying with EN593, API609 and ISO5211 standards.

It bears PN6/PN10/PN16/Class125/150 flange ratings, with 16Bar max pressure for DN50-DN300 and 10Bar for DN350-DN1400. A full ASTM-certified material portfolio covers cast iron, ductile iron, stainless steel, duplex steel and multi-type rubber seats (EPDM/NBR/FKM/Silicone).

The integrated U-section seat enables easy replacement and zero-leak sealing for municipal, chemical and HVAC pipelines. OEM & ODM custom solutions are available for global buyers.

DN300 U-Type Butterfly Valve with Hard Back Seat

DN500 PN10 U-Section Butterfly Valve — Ductile Iron Epoxy Coated Disc

DN1000 PN10 U-Section Butterfly Valve Exchangeable Dovetail Anchored Seat |

26" Class 150 U Type Butterfly Valve C95800 Al-Bronze Disc Seawater | Laux Valve

1.4469 Solid Disc Soft Seat U-type Butterfly Valve

U Section Butterfly Valve

What is a U-Section Butterfly Valve?

A U-Section (U-Type) Butterfly Valve is a resilient seated butterfly valve constructed with an extended U-shaped body, engineered for precise fitting between pipeline flanges.

Unlike conventional wafer butterfly valves, its unique U-section structure delivers superior flange alignment, steadier sealing performance and simplified installation, making it well-suited for DIN and EN standard piping systems.

The elongated U-body evenly spreads bolt tightening loads across the flange connection. This minimizes mechanical stress imposed on the valve seat during assembly and extends the service life of the seal. For this reason, U-Type butterfly valves are ideal for working conditions that demand frequent maintenance, dependable isolation, and consistent performance amid fluctuating pipeline loads.

Laux U-Section Butterfly Valves are available with EPDM, NBR, PTFE, FKM, and other seat materials, along with multiple body, disc, and shaft material options to meet different industrial applications.

U Type Concentric Butterfly Valve | Soft Seat Wafer Butterfly Valve PN10 PN16

U Type Concentric Soft Seat Butterfly Valve (Wafer Lug Type)

Key Features

Unique U-shaped integrated body design, shorter face-to-face length than standard double flange butterfly valve, save pipeline installation space
Concentric center-line disc structure, low operating torque, smooth 90° quarter turn on-off & accurate flow regulation performance
Tongue & groove vulcanized soft seat with hard back support, effectively prevent seat extrusion under PN16 high pressure, zero bidirectional bubble tight leakage
Replaceable resilient seat options: EPDM, NBR, FKM(Viton), Silicone, fit cold/hot water, oil, gas, weak corrosive medium
Universal flange drilling compliant with PN6/PN10/PN16 EN1092 & Class125/150 ASME B16.5, excellent pipeline interchangeability
Standard ISO 5211 top mounting flange, directly match manual handle, worm gear, electric & pneumatic actuator without extra bracket
Wide size coverage DN50~DN1400 (2"~56"), small size max working pressure 16Bar, large bore DN350-DN1400 rated 10Bar
Multi optional body & disc materials: Cast Iron, Ductile Iron, Stainless Steel CF8/CF8M, Duplex Steel, Bronze for seawater & chemical conditions
Manufactured & tested per global standards EN593, API609, BS5155, EN12266-1, ISO5208, API598, full inspection before shipment
Light compact construction, easy maintenance, long service life up to over 100,000 opening & closing cycles

Wide Application Industries

Municipal Water Supply & Wastewater Treatment Plant
HVAC Central Air Conditioning Cooling Water System
Chemical, Petrochemical & Oil Gas Pipeline
Food & Beverage, Pharmaceutical Production Line
Power Plant Circulating Water System
Irrigation, Marine Seawater & Fire Fighting Pipeline

1. General Technical Specification

Size Range: DN50 - DN1400 (2 inch - 56 inch)
Design Standard: EN593, API609, BS5155, EN1092, ISO5211
Flange End Standard: PN6, PN10, PN16, Class125 / Class150
Working Pressure: DN50~DN300 ≤16Bar; DN350~DN1400 ≤10Bar
Test Standard: EN 12266-1, ISO 5208, API 598
Top Mount Flange Standard: ISO 5211
Seat Type: Vulcanized Replaceable Soft Resilient Seat

2. Complete Material Specification

Spare Part Name	Optional Material Grade	ASTM Standard Code
Valve Body	Cast Iron / Ductile Iron	A126 Class B / A536 Gr.65-45-12
Butterfly Disc	Plated Ductile Iron / Bronze / Stainless Steel CF8/CF8M / Duplex Steel	A536 Gr.65-45-12 / B148 C95400/C95800 / A351 CF8/CF8M / A182-F15/F53/F55
Valve Stem	Anti-corrosion Stainless Steel	A276-410 / 304 / 316
Soft Seat Seal	EPDM / NBR / FKM(Viton) / Silicone	-
Support Bushing	FRP / PTFE / Bronze	-
Stem O-Ring	NBR / EPDM / Viton	-

3. Full Dimension Table (A/B/C/W Parameter)

U Type Concentric Butterfly Valve Dimension CAD Drawing Laux Valve

DN(mm)	Inch	A	B	C	W
50	2	161	80	43	14
65	2-1/2	175	89	46	14
80	3	181	95	46	14
100	4	200	114	52	14
125	5	213	127	56	17
150	6	226	139	56	17
200	8	260	175	60	22
250	10	292	203	68	22
300	12	337	242	78	22
350	14	368	267	78	22
400	16	400	309	102	36
450	18	422	328	114	36
500	20	480	361	127	36
600	24	562	459	154	46
700	28	624	520	165	46
750	30	660	560	190	110
800	32	672	570	190	110
900	36	720	636	203	110
1000	40	800	692	216	110
1100	44	890	735	254	110
1200	48	948	843	276	130
1400	56	1000	900	279	180

Custom Service Notice: We support customized special materials, special dimensions, special coating and full OEM ODM solutions. Please contact our sales team for detailed drawing & quotation.

Butterfly Valve Flow Coefficient Kv & Pressure Drop Reference Data

All concentric lug butterfly valves and wafer butterfly valves are equipped with complete opening-angle Kv flow coefficient table and GPM-PSI pressure drop nomograph, supporting metric & imperial dual-system pipeline design calculation for global industrial projects. Flow coefficient Kv represents the fluid throughput capacity of the valve; higher Kv value brings lower pipeline pressure loss and less operation energy consumption.

1. Kv Value Table at Different Opening Angle (DN50 ~ DN600, 10°~90° Full Open)

DN	10°	20°	30°	40°	50°	60°	70°	80°	90° Full Open
50	0.1	5	12	24	45	64	90	125	135
65	0.2	8	20	37	65	98	144	204	220
80	0.3	12	22	39	70	116	183	275	302
100	0.5	17	36	78	139	230	364	546	600
125	0.8	29	61	133	237	392	620	930	1022
150	2	45	95	205	366	605	958	1437	1579
200	3	89	188	408	727	1202	1903	2854	3136
250	4	151	320	694	1237	2047	3240	4859	5340
300	5	234	495	1072	1911	3162	5005	7507	8250
350	6	338	715	1549	2761	4568	7230	10844	11917
400	8	464	983	2130	3797	6282	9942	14913	16388
450	11	615	1302	2822	5028	8320	13168	19752	21705
500	14	791	1674	3628	6465	10698	16931	25396	27908
600	24	1222	2587	5605	9989	16528	26157	39236	43116

Table Instruction: Small opening 10°~30° for precise flow throttling; medium opening 40°~70° for circulating water regulation; 90° full open delivers maximum Kv value with minimum flow resistance for main pipeline isolation.

2. GPM & PSI Pressure Drop Nomograph Chart

Figure 1: Flow Rate & Pressure Drop Nomograph for Concentric Butterfly Valve

The pressure drop curve chart adopts US imperial units, with horizontal axis for flow rate GPM and vertical axis for differential pressure (PSI / Feet water head). Diagonal slant lines correspond to matching Kv/Cv flow coefficients, helping North American and ANSI standard clients quickly calculate pipeline medium pressure loss.

Horizontal axis: Flow range 100 ~ 100,000 Gallons Per Minute, covers DN50~DN600 full size flow demand;
Vertical axis dual units: PSI pressure difference and Feet water head, convenient for direct conversion of pipeline design parameters;
Operation logic: Locate flow GPM vertically intersect Kv diagonal line, horizontally read pressure drop value to judge system energy loss.

3. Combined Application of Kv Table & Pressure Drop Curve

Step 1: Confirm working opening angle (throttling / full open), extract Kv value from the table;
Step 2: Convert metric Kv to US Cv via formula: Cv = Kv × 1.156;
Step 3: Match Cv diagonal line on the GPM-PSI nomograph, calculate actual pipeline differential pressure;
Step 4: If pressure drop exceeds design allowable value, upgrade to larger DN butterfly valve to raise overall Kv flow capacity.

Catalog Technical Tips

Kv test standard: Clean water 15°C, SG=1, comply with EN 12266-1 & ISO5211;
Avoid long-term stable operation under 10°~20° small opening, high pressure drop will cause cavitation and seal abrasion;
The pressure drop nomograph only applies to liquid medium; gas & steam flow calculation requires special gas coefficient formula;
We provide dual system flow data to meet metric European projects and imperial US standard engineering selection demands.

Seat Material Selection

Seat material selection depends on the operating media, pressure, temperature, and application. Please contact our engineering team for professional material recommendations.

EPDM

Water, drinking water, wastewater, air, HVAC -20°C to +120°C(-4°F to +248°F)

NBR rubber seat for butterfly valves handling oil, fuel, and compressed air

NBR (Buna-N)

Oil, fuel, compressed air, hydrocarbons -20°C to +90°C(-4°F to +194°F)

PTFE

Strong acids, alkalis, solvents, corrosive chemicals -20°C to +200°C(-4°F to +392°F)

FKM (Viton®)

Oils, fuels, acids, chemicals, high-temperature media -10°C to +180°C(14°F to +356°F)

Silicone

Food, pharmaceutical, clean air, high-purity applications -60°C to +200°C(-76°F to +392°F)

High-temperature EPDM seat for butterfly valves in hot water and district heating systems

HT EPDM

Hot water, steam condensate, district heating -20°C to +150°C(-4°F to +302°F)

Manufacturing Excellence

Quality Control

Certification Quality Standard

100% Pressure Tested API598 ISO9001 CE WRAS ACS

U-Type Butterfly Valve

Learn more about our U-Section butterfly valve products, manufacturing standards, customization options, and technical support.

What is a U-Section Butterfly Valve?

A U-Section Butterfly Valve, also known as a U-Type Butterfly Valve, is a resilient seated butterfly valve with an extended U-shaped body designed for installation between pipeline flanges. The U-shaped profile improves valve alignment, enhances sealing stability, and distributes flange bolt loads more evenly than a standard wafer butterfly valve. It is widely used in water treatment, HVAC, municipal water supply, and industrial pipeline systems.

What is the difference between a U-Type and Wafer Butterfly Valve?

Both valves are installed between flanges, but a U-Type Butterfly Valve features a deeper U-shaped body that provides better flange positioning and improved sealing stability. Compared with a standard wafer butterfly valve, the U-section design reduces installation stress on the seat and offers better performance in large-diameter or frequently maintained pipeline systems.

Why choose a U-Section body?

The U-section body automatically centers the valve between flanges, helping ensure accurate installation and even bolt loading. This design improves sealing reliability, extends seat life, and reduces the risk of leakage caused by uneven flange compression.

Can a U-Type Butterfly Valve be installed at the end of a pipeline?

Most U-Type Butterfly Valves are intended for installation between mating flanges. End-of-line service depends on the valve design, pressure rating, and manufacturer's specifications. If end-of-line isolation is required, a lug butterfly valve is often the preferred solution.

Which flange standards are supported?

Laux U-Section Butterfly Valves are available for a wide range of international flange standards, including EN 1092-1, DIN 2501, BS 4504, ANSI B16.5, AS 4087, and JIS standards, depending on the valve size and project requirements.

What seat materials are available?

Multiple seat materials are available to match different media and temperatures, including EPDM, NBR, High-Temperature EPDM, Viton (FKM), PTFE, and Silicone. Our engineering team can recommend the most suitable seat material based on your application.

Which industries commonly use U-Type Butterfly Valves?

U-Section Butterfly Valves are widely used in municipal water supply, wastewater treatment, HVAC systems, industrial utilities, chemical processing, marine engineering, food processing, irrigation, and general industrial pipeline applications.

What pressure ratings are available?

Standard pressure ratings include PN10, PN16, ANSI Class 150, and other ratings upon request. Valve selection should be based on the operating pressure, temperature, and pipeline design.

Can it be automated with electric actuators?

Yes. Laux U-Section Butterfly Valves are designed with an ISO 5211 mounting pad, making them compatible with manual gear operators, pneumatic actuators, and electric actuators for automated flow control.

Is it suitable for throttling service?

Yes. U-Type Butterfly Valves can be used for both on/off isolation and moderate flow regulation. For precise throttling or severe control applications, our engineering team can recommend the most suitable valve configuration.

What disc materials can be selected?

Laux offers a variety of disc materials, including Nickel-Plated Ductile Iron, CF8 (304 Stainless Steel), CF8M (316 Stainless Steel), Duplex Stainless Steel, Aluminum Bronze, Nylon-Coated Ductile Iron, and PTFE-Lined Disc, depending on the operating media and service conditions.

How is the valve tested before shipment?

Every U-Section Butterfly Valve undergoes strict quality control, including hydrostatic shell testing, seat leakage testing, dimensional inspection, coating inspection, torque verification, and final visual inspection to ensure reliable performance before delivery.

What certifications are available?

Laux Valve manufactures products under an ISO 9001 quality management system and can provide certifications such as CE, as well as project-specific documentation and test reports where applicable. Additional certifications are available depending on customer requirements and product configuration.

Do you provide OEM and private label services?

Yes. We offer comprehensive OEM and private label manufacturing, including customized valve materials, body markings, logo casting, epoxy coating colors, flange drilling standards, packaging, manuals, and branding to meet the needs of distributors and industrial projects worldwide

Why choose Laux Valve as your U-Section Butterfly Valve manufacturer?

Laux Valve specializes in manufacturing high-quality butterfly valves with a strong focus on engineering, precision machining, and quality control. We provide OEM solutions, flexible customization, international standard compliance, and responsive technical support, helping customers worldwide source reliable U-Section Butterfly Valves for municipal, industrial, and infrastructure projects.

LAUX Valve is a trusted OEM butterfly valve manufacturer, delivering customized valve solutions with reliable quality and global service.

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Butterfly Valve: Wafer Butterfly Valve; Lug Butterfly Valve; Double Flange Butterfly Valve; PTFE Lined Butterfly Valve; U-section Butterfly Valve; Grooved End Butterfly Valve; AWWA C504 Rubber Seated Butterfly Valve; Double Eccentric Flange Butterfly Valve

Knowledge Center: Butterfly Valve Basics; Butterfly Valve Material; Valve International Standards; Valve Selection Guide

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james@lauxvalve.com

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