Lug-style butterfly valves usually comprise a metal such as ductile iron or steel. They feature threaded tapped lugs positioned on the valve flanges for bolt connections.

What is a Wafer Type Butterfly Valve?

A wafer butterfly valve’s function is to retain a seal to protect against dual-directional pressure differential in fluid flow. In other words, the wafer version of butterfly valves was designed to hold a tight seal, safeguarding against a bi-directional pressure differential to avoid any backflow in systems manufactured for uni-directional flow. This is accomplished by using a tightly fitted seal, such as an O-ring, gasket, or precision machined, along with a flat valve face on the downstream and upstream sections of the valve.

Wafer vs Lug

Wafer Type Butterfly Valve

• Lighter
• Cheaper
• Easy installation
• Pipe flanges required
• More difficult to center
• Not suitable as an end valve
  In the case of a Wafer-style butterfly valve, the body is annular with a few non-tapped centering holes. Some Wafer types have two, while others have four.

Lug-type Butterfly Valve

• Suitable as an end valve
• Easier to center
• Less sensitive in case of large temperature differences
• Heavier with larger sizes
• More expensive

Lug vs Wafer

In the case of a Wafer-style butterfly valve, the body is annular with a few non-tapped centering holes. Some Wafer types have two, while others have four.

The flange bolts are inserted through the bolt holes of the two pipe flanges and the centering holes of the butterfly valve. The pipe flanges are pulled towards each other by tightening the flange bolts, and the butterfly valve is clamped between the flanges and held in place.

In the case of a Lug-style butterfly valve, there are so-called “ears” over the entire circumference of the body into which threads are tapped. This way, the butterfly valve can be tightened against the two pipe flanges using 2 separate bolts( one on each side).

Because the butterfly valve is attached to each flange on both sides with separate, shorter bolts, the chance of relaxation through thermal expansion is smaller than with a Wafer-style valve. As a result, the Lug version is more suitable for applications with large temperature differences.

Butterfly Valve Lug vs Wafer

The wafer-style valve usually has two or four unthreaded holes to secure and align the valve within two mating flanges. The lug style has threaded holes that allow the user to take off one end of the line without affecting the opposite side, as it is held securely against one flange with bolts that match the threaded lugs on the valve. This makes it easier to clean, inspect, repair, or replace other sections of pipework, as there is no need to shut down the whole system.

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We rely upon strategic thinking, constant modernization in all segments, technological advances, and of course, upon our employees that directly participate in our success for Epdm Butterfly Valve, Check Valve Price, Butterfly Valve Stainless Steel, Wafer Type Pinless Backed Seat Butterfly Valve, Soft Sealed Butterfly Valve.

ZECO Valve is a specialized supplier and manufacturer specializing in the butterfly valve design, production, and export business, focusing on the valves and fittings for the control and protection of drinking water, wastewater, irrigation, pump station, HVAC…

ZECO Valve has a wide range of butterfly valves, gate valves, globe valves, and check valves; our top selling valves include gate valves F4, 10K, 125LB, PN16, 150LB, 300LB; globe valve 10K, 150LB, 300LB, and bellow seal globe PN16, PN40, butterfly valves no pin and with pin wafer universal standard, eccentric butterfly valves, high-performance butterfly valves, etc. Valve size ranges from 1″ to 60″.

China EPDM Butterfly Valve

• Series: Cost-effective Series Resilient Seat Butterfly Valve
• Port Size: DN32-DN2400(NPS1 1/4-NPS96)
• Pressure: PN6, PN10, PN16(Class 150)
• Temperature: -29℃ ~ +120℃
• Body: Ductile Iron: GGG40
• Seat: NR, NBR, EPDM, Viton, Silicone Rubber
• Disc/Trim: Epoxy Coated Ductile Iron,SS316,SS304,Duplex Stainless Steel,Al Bronze
• Stem: SS316,SS304,SS420,SS416
• Connection: Wafer, Lug, U-type flange
• Design Standard: API, DIN, ASME, ISO, ANSI, GB/T, BS EN, AWWA
• Certificate: CE, WRAS, API, ISO9001:2015, OHSAS18001:2007
• Application: water, power plant, HVAC, Food, Medicine, Desalination

Types of Butterfly Valves

Based on the type of ends of the body, butterfly valves are available in the following types.

• Both Flanged Ends
• Wafer Type Ends
• Lug Type Ends
• Butt Welded Types Ends

Wafer Butterfly Valve

Wafer concentric butterfly valve features a cartridge-type seat, streamlined disc, and strong stem-to-disc connection for easy use in industrial applications such as food and beverage, pulp and paper, chemical, mining, water treatment, power plants, etc.

Lug Butterfly Valve

This type of design has lugs attached to the valve body. Dead-end connections are the common uses for this type of butterfly valve.

What is API 609 A Butterfly Valve?

API 609 is the American design standard for butterfly valves divided into Categories A and B.

Category A valves are “concentric” type. Also known as rubber-lined butterfly valves. These are popular in low-pressure systems (Class 150 or less), relatively lower cycle life, and rubber liners are also good for abrasive slurry services.

Category B valves are “offset” type, meaning the shaft is offset from the disc so that they can handle higher differential pressures. Most offset types cause the disc to rotate freely from the seat after a few degrees of rotation, which minimizes seat wear and increases valve cycle life. The offset type can have rubber, polymer (PTFE or other), metal &graphite, or even metal seats. Lots of variety makes these suitable for various temperatures and pressures.

ZECO Valve, based on high-quality products, specialized international business teams, and specialized technical teams, has been well used in over 45 regions and countries, such as Russia, the UK, Italy, Spain, Romania, North African Countries, South Africa, Zambia… established stable and very good relationship with our partners and customers.

For more information on top butterfly valve manufacturers in China, please get in touch with ZECO today.

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Whole set eccentric control ball valves with V-notch ball, single acting spring return pneumatic actuator, Siemens positioner, and SMC air set are suitable for accurate flow regulating to achieve equal percentage flow characteristic. The V-notch ball has an excellent performance in regulating and cutting sticky service like fiber.

Zeco is good at supplying complete industrial valve solutions equipped with whole set accessories including a pneumatic actuator, electric actuator, limit switch, solenoid valve, air regulator, positioner, etc.

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What is a Bronze Butterfly Valve?

A butterfly valve with a bronze body and disc and NBR liner is suitable for a wide variety of isolation duties particularly marine applications. Manually operated, supplied with a lockable lever or gearbox.

These butterfly valves are commonly used in systems that need to isolate or regulate the flow of seawater. They are designed to be in systems where there are space, weight, and cost considerations. They are also a high-quality valve for seawater service or where the valve is submerged in seawater for commercial applications.

What is ASTM B148 C95800 Material?

ASTM B148 UNS C95800 is a very strong nickel aluminum bronze alloy. It has good castability, high strength, and outstanding corrosion resistance due to a tough oxide film.

Chemical Composition of Nickel Aluminum Bronze C95800

• Copper: 79.0 min
• Aluminum: 8.5-9.5
• Iron: 3.5-4.5
• Manganese: 0.8-1.5
• Nickel: 4.0-5.0
• Silicon: 0.10 max
• Lead: 0.03 max

Mechanical Property of Nickel Aluminum Bronze C95800

• Tensile Strength: 85 ksi(585 Mpa)
• Yield Strength: 35 ksi (240 Mpa) min
• Elongation in 2in. or 50.8mm: 15%min
• Reduction of area: 35% min
• Hardness (3000kg load): not required.

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The post ASTM B148 C95800 Material – Bronze Butterfly Valve appeared first on ZECO Valve.

ส่วนประกอบ ของ วาล์ว

• Body คือ โครงสร้างหลักนั่นเอง
• Flange คือหน้าแปลนส่วนประกอบระหว่างท่อกับวาล์วในกรณีที่วาล์วมีขนาดใหญ่ ต้องใช้ สลักยึด
• Stem คือ แกนกลางในการหมุนวาล์ว หรือที่เรียกว่าก้านนั่นเอง
• Seat คือ ชิ้นส่วนกันการรั่วไหลของน้ำ มีชนิดที่เป็นยาง และ โลหะ
• Hand Wheel หรือ Arm คือ บริเวณที่เปิดปิดวาล์ว ในกรณีที่เป็น โซลินอยด์ วาล์ว (Solenoid valve) จะเป็นการควบคุมโดยไฟฟ้า ผ่านหลักการคือ การใช้สนามแม่เหล็ก เหนี่ยวนำกลไกการปิด-เปิด
• Wedge ฝากั้น ปิด – เปิดน้ำ ในบอลวาล์ว ชิ้นส่วนนี้จะเรียกว่า Ball นั่นเอง

ประเภท ของ Valve

GLOBE VALVE

ใช้ในการควบคุมการไหล ใช้กับระบบที่มีความดันแตกต่างกันสูงมากๆได้ ด้วยระบบแบบตั้งฉากจึงสามารถหมุนปรับความเบาหรือแรงของไหลได้ลักษณะเด่นคือข้างในจะเป็นแบบหน้าดิส ตัว Body จะป่องออกมา แต่เนื่องจากมีการเปลี่ยนทิศทางการไหลความดันลดที่ตกคร่อม globe valve มากขึ้นตาม

Globe valve จึงนิยมใช้เป็นอย่างมากในงานที่ต้องควบคุมอัตราไหลของของไหล

GATE VALVE

ใช้ในการเปิดปิดการไหลเท่านั้น ไม่สามารถปรับระดับความแรงของๆไหลได้ อีกทั้งยังไม่มีบ่ารอง valve (valve seat) ที่มักจะใช้วัสดุเป็น polymer ที่ทนอุณหภูมิสูงไม่ได้ gate valve จึงสามารถใช้กับงานที่อุณหภูมิสูงได้ แต่ก็ไม่นิยมใช้กับของไหลที่มีสารแขวนลอย เพราะสารแขวนลอยจะตกไปอยู่ตามร่องของ valve ทำให้ไม่สามารถปิดได้สนิท

BALL VALVE

ใช้ในการเปิด-ปิดเช่นเดียวกับ gate valve โดยจะใช้การเปิดปิดแบบ 90องศา ซึ่งโดยปกติ ball valve จะนิยมใช้ในงานประปาตามบ้านทั่วๆไปเพราะใช้งานได้ง่าย ไม่มีความซับซ้อนอะไร ข้างในมีบอลที่มีรูรอดผ่านจึงถูกเรียกว่า Ball valve

KNIFE GATE VALVE

เหมือนกับ Gate valve แต่ประตูวาล์วเป็นเหมือนใบมีด(มีความคม) เหมาะใช้กับของไหลเหนียว ๆ มีเยื่อใยหรือเป็น ผง ๆ เช่น โรงงานทำกระดาษ, เม็ดพลาสติก อีกทั้งยังสามารถใช้งานในด้านอื่นๆได้อีกมากมายเพราะความคมของใบมีดจึงสามารถใช้ตัดของบางชนิดได้

BUTTERFLY VALVE

ใช้ในการควบคุมการไหล มีหน้าตาคล้าย gate valve แต่แทนที่จาน valve จะเคลื่อนที่ขึ้น/ลงแบบ gate valveตัว butterfly valve กลับใช้การหมุนแทนเหมือนball valve และมี seat valve เช่นเดียวกัน แต่ตัว butterfly valve กลับมีน้ำหนักเบากว่ามากนิยมใช้กับการควบคุมการไหลที่มีการปรับเปลี่ยนอย่างรวดเร็ว มีหลายสเกลมาก เช่น
ใช้กับอุโมงค์น้ำทิ้ง, ระบบดับเพลิง หรือกับรถยนต์บางชนิดก็มีวาล์วชนิดนี้เช่นกัน

ส่วนประกอบ Butterfly Valve

1. ลิ้น (disc)
2. ตัววาล์ว หรือ (body)
3. หมุด (pin หรือ bolt)
4. ซีท (seat) ซึ่งจะแบ่งเป็น
5. Soft seat หรือ seat ที่มีความยืดหยุ่น เป็นยาง สามารถเลือกได้หลายประเภทตามแต่ความเหมาะสมของของเหลว เช่น ยางที่ใช้กับน้ำดื่มได้ ยางที่ใช้กับสารเคมีได้
6. Hard seat หรือ seat แบบแข็ง อาจจะทำจากโลหะ ใช้กับงานที่ต้องใช้แรงดันสูง อุณหภูมิสูง
7. แกนวาล์ว (spindle)
8. แบริ่งและซีล (bearing and seals)

SAFETY VALVE

เซฟตี้วาล์วหรือวาล์วเพื่อความปลอดภัยจากความดันมีไว้ระบายความดันส่วนเกินออกจากระบบเพื่อไม่ให้เกิดการระเบิด ซึ่งจะสร้างความเสียหายให้ทั้งแก่ท่อและส่วนประกอบอื่นๆ อีกทั้งยังอาจจะทำให้ตัวผู้ใช้งานเกิดการบาดเจ็บจากแรงดันได้อีก

Safety valve จึงมีความสำคัญเป็นอย่างมากทุกอุตสาหกรรมใหญ่ๆจะต้องมีติดไว้ในระบบแน่นอน

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The post ส่วนประกอบ ของ วาล์ว – ส่วนประกอบ Butterfly Valve – ประเภท ของ Valve appeared first on ZECO Valve.

Butterfly valves are categorized according to their structure. Nowadays, there are more midline/center line butterfly valves and eccentric butterfly valves on the market. The standard length of the American standard butterfly valve used in the center line butterfly valve is the API 609 Class A butterfly valve. The eccentric butterfly valve is mainly a three-offset butterfly valve. The structure length standard adopted is the Class B butterfly valve regulated by API 609.

Two butterfly valve categories:

Category A Butterfly Valves:

Manufacturer’s rated cold working pressure (CWP) butterfly valves, usually with a concentric disc and seat configuration.  Sizes covered are NPS 2 to NPS 48 for valves having ASME Class 125 or Class 150 flange bolting patterns.

Category B Butterfly Valves:

Pressure-temperature rated butterfly valves that have an offset seat and either an eccentric or a concentric disc configuration.  These valves may have a seat rating less than the body rating.  Sizes covered are NPS 3 to NPS 24 for Classes 150, 300, and 600.

The Class B butterfly valve of the API 609 standard specifies the structure length of the American standard butterfly valve, flange butterfly valve, and lug butterfly valve. In comparison with the national standard GB butterfly valve, the flange butterfly valve, and the national standard butterfly valve structure length is the same, but there is a gap between the clip butterfly valve, especially the 6 inch, 8 inch difference between the two specifications/standard is largest. This is also a way to judge a manufacturer if they are professional in producing American standard butterfly valves.

In the API 609 Category B, the 6-inch to 150LB butterfly valve is specified, the structure length is only 57mm, and many manufacturers, or 70mm, is the same with the national standard valve body, it can be seen that many American standard butterfly valve manufacturers directly to use the national standard valve mold. The valve body was modified to the American standard connection size.

Differences between API 609 Category A and Category B Butterfly Valves

Category A Butterfly Valves

“Concentric” type. Also known as rubber-lined butterfly valves. These are popular in low-pressure systems (Class 150 or less), relatively lower cycle life, rubber liners are also good for abrasive slurry services.

Category B Butterfly valves

“Offset” type, meaning the shaft is offset from the disc, so it can handle higher differential pressures. Most of the offset types cause the disc to rotate freely from the seat after a few degrees of rotation, which minimizes seat wear and increases valve cycle life. The offset type can have rubber, polymer (PTFE or other), metal &graphite, or even metal seats. Lots of variety which makes these suitable for a variety of temperatures and pressures.

BUTTERFLY VALVE STANDARDS

API STANDARDS

API Std 598 – Valve Inspection and Test

API Std 609 – Butterfly Valves: Double-Flanged, Lug- and Wafer-Type

ASME STANDARDS

ASME B1.1 – Unified Inch Screw Threads, (UN and UNR Thread Form)

ASME B16.1 – Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250

ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard

ASME B16.20 – Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed

ASME B16.24 – Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 600, 900, 1500 and 2500

ASME B16.34 – Valves Flanged, Threaded and Welding End

ASME B16.42 – Malleable Iron Threaded Pipe Unions: Classes 150, 250, and 300

ASME B16.47 – Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard

ASME B31.3 – Process Piping

ASME B46.1 – Surface Texture (Surface Roundness, Waviness, and Lay)

AWWA STANDARDS

AWWA C504 – Rubber Seated Butterfly Valves

AWWA M49 – Butterfly Valves: Torque, Head Loss & Cavitation Analysis

BSI STANDARDS

BS 5155 – Specification for butterfly valves

ISO STANDARDS

ISO 5752 – Metal valves for use in flanged pipe systems — Face-to-face and center-to-face dimensions

ISO 10631 – Metallic butterfly valves for general purposes

MSS STANDARDS

MSS SP-6 – Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings

MSS SP-25 – Standard Marking Systems for Valves, Fittings, Flanges and Unions

MSS SP-44 – Steel Pipeline Flanges

MSS SP-45 – Bypass and Drain Connections

MSS SP-67 – Butterfly Valves

MSS SP-91 – Guidelines for Manual Operation of Valves

Our API 609 standard butterfly valve has a unique set of molds, which are designed and manufactured according to API 609 and other related regulations. Therefore, regardless of the valve body thickness, flange thickness, and structural length can reach the relevant standards.

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