- Centre Sealing
- Force Sealed
- Mid-Pressure (2.5mpa< Pn <6.4mpa)
- Normal Temperature (-40°C
- Soft Sealed
- EPDM,NBR
Specification
C504 Concentric Butterfly Valve Flanged EPDM SeatButterfly Valve
I. Product Basic Parameters and Core Positioning
Model: Concentric Butterfly Valve
Connection Form: Flanged (Flange Support, compatible with GB/T 9113, ANSI B16.5, ISO 7005 international flange standards)
Structure Design: Concentric Central Line Structure (stem axis, disc center, and pipeline centerline coaxial)
Seal Type: Soft Seal (elastic preload sealing, achieving zero leakage through rubber seat deformation)
Stem Design: Standard straight stem (no eccentric offset, axis perpendicular to pipeline center)
Working Pressure: Medium Pressure (PN10-PN40, 1.0MPa-4.0MPa, covering 2.5MPa＜Pn＜6.4MPa industrial conditions)
Working Temperature: Normal Temperature (-40℃＜T＜120℃, suitable for most water, gas, and oil media)
Body Material: Casting (CI cast iron/DI ductile iron/SS stainless steel)
Application Fields: Industrial pipeline systems, water industry (water supply/drainage, sewage treatment), civil buildings, general fluid transportation
II. Analysis of Core Technical Features
(A) Advantages of Concentric Central Line Structure
Geometric Coaxial Design: The stem, disc, and pipeline centerline are perfectly coaxial. When fully open, the disc aligns parallel to the fluid flow, with the flow coefficient Cv increased by 15%-20% compared to eccentric structures (pressure loss of DN100 valve ≤0.2m water column), ideal for high-flow scenarios (e.g., urban water mains, industrial circulating water pipes).
90° Precise On-Off: The disc completes opening/closing within a 90° rotation around the central axis. A mechanical limit device ensures an angle error ≤1°, with the handle position directly reflecting the opening degree for intuitive on-site operation and status monitoring.
Elastic Sealing Principle: EPDM/NBR rubber seats are fixed to the body via dovetail grooves or pressure rings, directly 贴合 the disc edge to form a bi-directional zero-leakage seal (leakage rate ≤5×10⁻⁸m³/s, conforming to EN12266 Class A standards) through medium pressure or preload.
Serviceability Design: The seal seat supports online replacement (no pipeline disassembly needed), reducing maintenance time by 40% compared to hard-seal valves, suitable for long-term operation in municipal networks and sewage treatment where maintenance is difficult.
(B) Material System and Working Condition Adaptation
|
Component |
Material Options |
Performance Characteristics |
Typical Applications |
|
Body |
Cast Iron (CI) |
Cost-effective, suitable for general water and low-pressure civil use |
Community water supply, irrigation pipes (PN10-PN16) |
|
|
Ductile Iron (DI/QT450) |
High strength (tensile ≥450MPa), impact resistance (-40℃ impact energy ≥27J) |
Industrial medium-pressure pipes, particle-containing sewage (PN25-PN40) |
|
|
Stainless Steel (CF8/CF8M) |
Corrosion-resistant (chloride ≤200ppm), sanitary-grade |
Food & pharmaceutical, seawater desalination, weak acid/base pipes |
|
Disc |
CI/DI with nickel plating |
Surface roughness Ra≤3.2μm, nickel plating ≥25μm, resistant to sewage erosion |
Sewage treatment plants, industrial wastewater pipes |
|
|
Stainless Steel (CF8/CF8M) |
High-temperature oxidation resistance (short-term 150℃), intergranular corrosion resistance |
Hot water circulation, steam tracing pipes |
|
Seal Seat |
EPDM (food-grade optional) |
Water/drinking water resistant (WRAS/NSF61 certified), temperature -20℃~120℃ |
Drinking water pipes, air conditioning chilled water systems |
|
|
NBR |
Oil/hydrocarbon resistant (ASTM No.3 oil test passed), temperature -40℃~100℃ |
Lubricating oil pipes, compressed air systems |
(C) Characteristics of Flanged Connection
Installation Versatility: Flange sealing surfaces support RF (Raised Face)/RTJ (Ring Type Joint), with bolt hole spacing complying with international standards, adapting to global pipeline systems without additional flange spacing adjustments during installation.
Pressure Stability: Flange thickness is designed per ASME B16.5 standards. PN40 valve flanges are CNC-machined (flatness ≤0.03mm), ensuring no deformation under 1.5x nominal pressure, suitable for vibrating or high-pressure drop conditions (e.g., pump inlets/outlets).