Name: Butterfly Valve DN350 DN200 DN100 DN80 PN16
Brand: Supreme Valves India
SKU: BFV-PN16-DN350-DN200
Availability: InStock
Rating: 4.8 (127 reviews)

Question 1

What is the difference between wafer and lugged butterfly valve designs?

Accepted Answer

Wafer-style butterfly valves are held between two pipeline flanges by bolts that pass through the valve body and both flanges. The valve body has clearance slots (not threaded holes) for the bolts. Wafer valves must be installed between two flanges and cannot be used as an end-of-line valve. Lugged butterfly valves have threaded bolt holes (lugs) on the body that align with the pipeline flange bolts. They can be installed as end-of-line valves or between two flanges. For Tunisia and North African water projects, lugged designs are preferred for ease of maintenance — the valve can be removed without disturbing the opposite pipeline flange. Wafer designs offer lower face-to-face dimensions and are preferred for inline installations where the upstream flange holds the valve.

Question 2

What is Marine Bronze (A4 / CC499K) and when should it be used?

Accepted Answer

Marine Bronze (also called gunmetal or CC499K / CuSn5Zn5Pb5) is a copper alloy specifically formulated for seawater and marine service. It offers superior resistance to dezincification, dealuminification, and impingement attack compared to standard bronze. Marine Bronze is the standard choice for shipboard and offshore platform butterfly valves in seawater cooling systems, ballast systems, and seawater intake/discharge. For Tunisia's coastal and port infrastructure projects, Marine Bronze discs and bodies provide decades of maintenance-free service in raw seawater. The alternative — stainless steel A4 (SS316L) — is also suitable for seawater but at higher cost and with slightly lower erosion resistance at high flow velocities.

Question 3

What does SS A4 mean in valve material specifications?

Accepted Answer

SS A4 refers to the ISO 3506 stainless steel classification for A4-80 (or A4-70) grade stainless steel, which is equivalent to EN 1.4401 / UNS S31603 (commonly known as SS316L). The 'A4' designation indicates: 'A' = austenitic stainless steel, '4' = corrosion resistance class 4 (superior, for marine/industrial atmospheres). The '-80' indicates a minimum tensile strength of 800 MPa. For butterfly valve applications in Tunisia's water and wastewater sector, SS A4 (SS316L) is widely specified for its excellent corrosion resistance in chlorinated potable water and treated wastewater. It is the preferred alternative to Marine Bronze where higher strength or food-grade certification is required.

Question 4

What is epoxy-coated steel for butterfly valves and where is it used?

Accepted Answer

Epoxy-coated cast iron or ductile iron uses a fusion-bonded epoxy (FBE) coating applied to the internal and external surfaces of the valve body. The coating provides a continuous, uniform barrier against corrosion — effectively giving the valve the strength of cast iron with the corrosion resistance of stainless steel at a significantly lower cost. Epoxy-coated butterfly valves are widely used in potable water distribution, wastewater treatment plants, and irrigation networks. Common coating specifications: AWWA C550 (American Water Works Association) for potable water epoxy coatings, or ISO 5259 for industrial fusion-bonded epoxy. The coating is typically 250–400 microns thick and fusion-cured for adhesion.

Question 5

What size DN350 and DN200 butterfly valves are typically used for in water projects?

Accepted Answer

DN350 (14") and DN200 (8") are common sizes in large-scale water transmission and distribution projects. DN350 butterfly valves are typically installed in: raw water intake mains from reservoirs or desalination plants, trunk main isolation valves (sectionalizing), wastewater treatment plant influent and effluent lines, and cooling water circuits. DN200 is used for: branch line isolation, pump station isolation, and process connection points. Both sizes are commonly gear-operated (rather than lever-operated) due to the higher torque required to seat and unseat the valve at 16 bar differential pressure. Gear operators with handwheel allow precise, controlled operation and position indication.

Question 6

What are the export and shipping details for large butterfly valves to Tunisia?

Accepted Answer

We export butterfly valves DN80 through DN600 to Tunisia and North African countries via sea freight from Nhava Sheva (JNPT), Mumbai, or Mundra port. For DN350 and DN200, crates are typically 1.2m × 1.2m × 1.0m and 1.0m × 1.0m × 0.8m respectively. Sea freight to La Goulette (Tunis), or Rades port typically takes 18–24 days. We can also ship to Algiers, Oran, and Benghazi. CIF and CFR incoterms available. Export documentation includes: Bill of Lading, Commercial Invoice, Packing List, Certificate of Origin (Indian Chamber of Commerce), and Material Test Certificates (EN 10204 3.1). ISPM 15 wood crating is standard for all wooden packaging.

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25

Size (DN)	Flange OD (mm)	Face-to-Face (mm)	Bolt Holes	Actuator Mount (ISO 5211)	Approx. Weight (kg)
DN80 (3")	200	49	8 × Ø18	F07	8
DN100 (4")	220	56	8 × Ø18	F07	11
DN200 (8")	335	60	12 × Ø22	F10	28
DN350 (14")	520	78	16 × Ø26	F14	95

Parameter	Specification Standard
Manufacturing Standard	IS 780 / IS 2906 / IS 14846
Testing & Inspection Standard	Hydrostatic Body: 1.5x PN, Seat: 1.0x PN
Face-to-Face Dimensions	ASME B16.10 / Manufacturer Standard
End Connections	Flanged / Screwed / Socket Weld / Butt Weld

Part Name	Material
Body & Bonnet	Cast Iron (IS 210 Gr. FG 200)
Stem / Spindle	Stainless Steel (AISI 410)
Seat / Trim	Bronze (IS 318 LTB 2) or SS 410
Gland Packing	Graphite / PTFE (Application Dependent)
Handwheel / Actuator	Cast Iron / Steel / SG Iron

Butterfly Valve DN35/0 PN16

Butterfly Valve DN350, DN200, DN100 & DN80 — PN16

Materials of Construction (MOC)

Technical Specifications

Dimensions — Common Sizes (Wafer Pattern, PN16)

Common Applications

Features & Benefits

Three MOC Options

Wafer or Lugged Design

ISO 5211 Actuator Mounting

Bubble-Tight Shut-Off

Request Detailed Enquiry

Purchase Options

Technical Specifications

Materials of Construction (MOC)