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NIPO
NIPO Triple offset uni-directional butterfly valve adopts the replaceable sealing structure of “Stainless steel and graphite laminated ”. This series could reach uni-directional Zero-leakage requirement in related standard. Trim material is made of high quality stainless steel, it could avoid the corrosion problem after long time using.
• Multi-layer sealing & solid metal sealing
• Low opening torque
• Friction free between seat and sealing
• Fire safe design to API607
• Replaceable Disc Sealing
Size Range: 2”-144” (50mm-3600mm)
Pressure Rating: ASME 150LB, 300LB, 600LB, 900LB,1500LB
Temperature Range: -46℃– +600℃
Connection: Wafer, Lug, Butt Weld, Double Flange
Shutoff tightness: ISO 5208-A , ANSI B16.104-VI
Structure: Multi-layer
Material: WCB, CF8M, A105, F316, C95800, Titanium, Monel, Hastelloy etc.
Operation: Lever, Gear, Pneumatic, Electric OP
Valve Marking: MSS-SP-25
Design & Manufacture: API 609, EN 593
Face to Face Dimension: API 609, ISO 5752, EN 558
End Connection: ASME B16.5, ASME B16.47, EN 1092, JIS B2220, GOST 12820
Test and Inspection: API 598, EN 12266, ISO 5208, ANSI B16.104
Top Flange: ISO 5211
Structure
Triple offset butterfly valve add a third angular eccentric based on double eccentric structure. The third offset is consist of an certain angle between center line of valve body and conical seat sealing face, it ensure the sealing ring of the disc can be separated or touched with seat rapidly so that friction and squeeze between seat and sealing ring will be eliminated.
Low opening torque
This serial uses the Radial Dynamically Balanced Sealing System,by means of optimized design, the forces undertaken on both sides for the butterfly disc inlet and outlet become approximately balanced so as to effectively lower the valve opening torque.
Seal ring material
Seal ring of this serial is made of stainless steel plate with graphite/ carbon fiber/ PTFE etc. The main sealing is stainless steel plate, non-metal interlayer as the assistant one. This structure makes the valve more reliably sealed and the leakage of sealing reach VI class to ANSI B16.104 or A class to ISO 5208. Compare to the rubber asbestos plate material, our adopting material is more wearable, anti-flush, reliable and better for environmental.
Packing-combined sealing system
NSEN adopt this structure to ensure valve leakage could meet ≤20ppm at maximum. The dynamic sealing structure is available if necessary, which make the packing sealing under good condition and prolong the free maintenance period of packing.
Evenly Fixed Structure
Butterfly valve’s sealing ring is fixed with evenly distributed bolts/nuts. Every bolt is precisely located and endure force evenly. This structure eliminates the problems of leakage or loose sealing ring due to uneven force of bolts and nuts.
Fire safe design and structure
Metal seated structure makes valve fire-safe and meet the requirement in API 607.
Gear box
The manual gear box offered in high quality and safety structure, which has combined with current well-known brand gear box features and the protection level reach IP 67.
Advantege:
✅ Optimized uni‑directional tight shut‑off: Superior sealing performance for specified pressure direction, ideal for pipelines where pressure only comes from one side
✅ Triple‑offset friction‑free operation: Disc lifts off seat immediately upon rotation, no scraping, low operating torque, long seat service life
✅ Robust metal‑to‑metal hard seat: Suitable for high‑temperature steam, flue gas, thermal oil and abrasive process media
✅ Cost‑effective solution: Compared with bi‑directional triple offset butterfly valve, competitive price for unidirectional working conditions
✅ Multiple end options: Wafer / Lug / Flanged connections; configurable with gearbox, pneumatic or electric actuator
✅ Compliant with API 609, ASME B16.34, API 598; optional fire‑safe & SIL certification
