Butterfly Valve DN35/0 PN16

Engineering guides: API 609 butterfly valve guide · API 598 tested butterfly · Butterfly standards hub

Export-Ready for Tunisia, North Africa & Mediterranean Markets

origin Mumbai (JNPT) | CIF La Goulette, Rades, Algiers, Oran | EN 10204 3.1 material certs

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Butterfly Valve DN350, DN200, DN100 & DN80 — PN16

Supreme Valves India manufactures butterfly valves in sizes DN80 through DN600 with PN16 pressure rating, available in multiple materials of construction to match your specific application — from raw seawater intake to potable water distribution. For Tunisia and North African projects, we supply three primary MOC configurations: Marine Bronze (CC499K) for seawater cooling and ballast, Stainless Steel A4 (SS316L) for chlorinated potable water and treated wastewater, and Epoxy Coated Cast Iron/Ductile Iron for cost-effective raw water and irrigation. Available in both wafer (short-pattern, between-flange) and lugged (ISO 5752 Series 20, end-of-line capable) designs. DN350 and DN200 are standard with gear operators; DN100 and DN80 available with lever or gear operators.

Materials of Construction (MOC)

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

Technical Specifications

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

Dimensions — Common Sizes (Wafer Pattern, PN16)

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

Common Applications

Water Distribution

Potable water trunk mains, branch isolation, district metering

Seawater Intake

Cooling water, desalination intake, marine systems

Wastewater Treatment

Activated sludge, secondary treatment, sludge handling

Features & Benefits

Three MOC Options

Choose the material of construction that matches your budget and service: Marine Bronze for seawater, SS316L for chlorinated water, or FBE-coated cast/ductile iron for cost-effective raw water and irrigation applications.

Wafer or Lugged Design

Wafer design for minimum face-to-face dimension and lower weight; lugged design for end-of-line installation capability. Both designs share the same ISO 5752 Series 20 face-to-face for interchangeability.

ISO 5211 Actuator Mounting

All sizes feature standard ISO 5211 top flange and shaft dimensions, allowing pneumatic, electric, or hydraulic actuators to be mounted without custom brackets. Gear operators are standard for DN200 and above.

Bubble-Tight Shut-Off

EPDM seats provide Class A shut-off (bubble-tight) per API 598 across all sizes. NBR seats available for petroleum service. Both seat materials are fully wrapped and pinned to prevent rotation and blow-out.

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Technical Specifications

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

Materials of Construction (MOC)

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

Frequently Asked Questions

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

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.

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

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.

What does SS A4 mean in valve material specifications?

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.

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

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.

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

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.