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Ductile iron butterfly valve 1181 Lug NF Gas

The 1181 series valve is a TTV lug butterfly valve, with a ductile iron body and low temperature NBR seat. It is used to close or regulate gas networks, is NF certified and class MOP5.
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(Indicative price) €248.82

Syveco's TTV range

What is the TTV range'

TTV is a worldwide renowned company focused on three major aspects in making its products: design, production, and quality. Continuous technical innovations are key to the brand's valves high reliability.

Syveco offers an extended range of concentric butterfly valves made by TTV. We keep DN32-40 to DN600 diameters in stock. Some references are also available depending on factory production time, up to DN2000.

A great variety of materials available

Depending on intended uses, TTV provides concentric butterfly valves made up of a great number of different materials:

  • Bodies: GGG50 ductile iron, also called SG iron or nodular cast iron (EN-GJS-500-7), Rilsan coated

  • Seats: EPDM, high-temperature EPDM, NBR, white NBR, carboxylated NBR, FKM, silicone, food-grade silicone, or even Teflon®

  • Discs: CF8M stainless steel, polished CF8M stainless steel, Teflon® coated stainless steel, EN-GJS-500-7 iron coated with Epoxy or Rilsan, aluminium bronze

Technical characteristics of TTV concentric butterfly valves

TTV concentric butterfly valves do have major technical advantages:

  • Lever or manual gear with limit switches or bare shaft above DN300

  • Locking device with notched pad

  • Square driven stem and ISO 5211 pad for direct mounting of an actuator

  • Connections available: PN10/16 or PN25 flanged, ANSI 150

  • wafer type or lug type

Moreover, several elements ensure the valves solidity:

  • Full crossing stem

  • Dovetail seat for perfect retaining

  • Disc held by striated stem preventing mechanical slacks

Fields of application

Thanks to the wide variety of materials used to make discs and seats, TTV concentric butterfly valves can be adapted for numerous sensitive and different applications as far as fluids and temperatures are concerned. For instance, they can be used for specific applications such as food products, abrasive and powdery products, marine applications (shipbuilding and offshore construction), or even gas systems.


All of TTV butterfly valves are EC certified. Most of them have Bureau Veritas or ABS Marine agreement as well. Some models also have the ACS (French sanitary certificate) and FDA (American Food and Drug Administration) certifications.

DN inches NPS 2''
Option certificate 3.1 Yes
DN metric 50/60
Construction standard ISO 10631 - EN 593
CE risk category III Module H
Type of paint Rilsan
Paint coating thickness (µm) 250.00
EN face-to-face standard EN 558 Series 20
DIN face-to-face standard DIN 3202 Part.3 Series K1
ISO face-to-face standard ISO 5752 Series 20
Brand TTV
Tightness test standard EN 12266-1 Rate A
Type of seat Removable
Notch plate Yes
Opening device Handle
Application Gas
ATEX atmosphere Group II Cat. 2G/2D
Shaft/stem matérial Stainless steel AISI 420
Lockable Yes
Square, star (mm) Square 8 mm
ATEX compatible Yes
Torque (Nm) 10.0
DN 50
Face to Face (mm) 43.0
Fluid Cold water / drinking water
Kv (m³/h) 54.0
Seat NBR - Gas
Body material Ductile iron
Disc material Stainless steel ASTM A351 CF8M
ISO pad 5211 F05/F07
PS (bar) 5
Connections Between flanges PN10/16
TS max (°C) 60
TS min (°C) -20
Butterfly valve design Concentric
Wafer/lug Lug
ATEX zone 1 & 21. 2 & 22
Through shaft Yes
Warranty period 5 years
CE Yes
Handle material Aluminium
NF Yes


Product Reference Price Stock
Ductile iron butterfly valve 1181 Lug NF Gas DN40
Ductile iron butterfly valve 1181 Lug NF Gas DN50
Ductile iron butterfly valve 1181 Lug NF Gas DN65
Ductile iron butterfly valve 1181 Lug NF Gas DN80
Ductile iron butterfly valve 1181 Lug NF Gas DN100
Ductile iron butterfly valve 1181 Lug NF Gas DN125
Ductile iron butterfly valve 1181 Lug NF Gas DN150
Ductile iron butterfly valve 1181 Lug NF Gas DN200 - PN10

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