I. Structure & Installation Methods
1. Wafer-Type Connection
Structural Features:
The valve body lacks flanges, with smooth sealing surfaces on both ends.
Relies on being "clamped" between two pipe flanges (requiring dedicated sealing gaskets, e.g., NBR or PTFE).
Installation Process:
Place the valve between two flanged pipes, aligning bolt holes.
Insert sealing gaskets (one on each side of the valve body; some designs use a single gasket).
Insert bolts and tighten diagonally to achieve sealing via flange clamping force.
Key Accessories:
No valve flanges required; only bolts, nuts, and gaskets matching the pipe flange specifications.
2. Flanged Connection
Structural Features:
The valve has integrated cast or welded flanges with pre-drilled bolt holes for direct "face-to-face" connection with pipe flanges.
Installation Process:
Place one sealing gasket between the valve flange and pipe flange.
Align bolt holes, insert bolts, and tighten diagonally to achieve sealing via bolt preload.
Key Accessories:
Bolts, nuts, and a single gasket matching the flange specifications.
II. Recommended Applications
1. Wafer-Type Butterfly Valves
Space-constrained areas: E.g., pump rooms with dense piping or internal equipment lines.
Low/medium-pressure, moderate-temperature media: E.g., water supply, wastewater, HVAC systems (pressure ≤1.6MPa, temperature ≤120°C).
Cost-sensitive, low-maintenance scenarios: E.g., municipal water projects, industrial cooling systems.
2. Flanged Butterfly Valves
High-pressure/high-temperature media: E.g., petrochemicals, natural gas (pressure ≥2.5MPa, temperature ≤400°C).
High-sealing-demand applications: E.g., flammable/explosive (LPG, methanol) or toxic/hazardous media (acid/alkali solutions).
Frequent-maintenance systems: E.g., chemical plant pipelines requiring regular inspections.
Large-diameter valves (DN≥300): Flanged type ensures easier alignment and stable sealing.
III. Selection Considerations
Media Parameters:
For pressure >1.6MPa or temperature >120°C, flanged type is preferred.
For low-pressure/ambient-temperature, wafer type is viable.
Space Constraints:
If axial space is limited (e.g., tight equipment gaps), wafer type is the only option.
Maintenance Frequency:
For frequently maintained lines (e.g., reactor feed valves), flanged type reduces downtime.
Pipe Compatibility:
Verify flange specifications (e.g., PN1.6/DN100) to avoid mismatches.
For wafer type, ensure the pipe flange spacing matches the valve body length.
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