Soft Seal Lug Butterfly Valve

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Soft Seal Lug Butterfly Valve

The Soft Seal Lug Butterfly Valve features high-quality resilient sealing materials and lug-type connection design, offering excellent sealing performance and convenient installation/maintenance.

Performance and characteristics:

Product Description

The Soft Seal Lug Butterfly Valve features high-quality resilient sealing materials and lug-type connection design, offering excellent sealing performance and convenient installation/maintenance. Widely used in water treatment, chemical, HVAC and other industries for flow control of liquids, gases and various media.

Product Features

Bubble-tight sealing– EPDM/NBR/PTFE soft seat achieves zero leakage (ANSI Class VI)
Lug-type connection– Easy installation, maintenance without pipeline disassembly
Bidirectional sealing– Excellent sealing in both flow directions
Low flow resistance– Minimal pressure drop when fully open
Corrosion-resistant materials– Body options: cast iron, ductile iron, stainless steel (304/316)
Multiple actuation options– Manual, electric or pneumatic operation available
Long service life– Replaceable seat reduces maintenance cost
Easy operation– 90° rotation with low operating torque

Technical Specifications

Nominal Diameter	DN50～DN600 (2″～24″)
Pressure Rating	PN10/PN16 (Class 150)
Temperature Range	-20℃～150℃ (depending on seat material)
Applicable Media	Water, air, oil, weakly corrosive media
Connection Type	Lug-type (Compliant with GB/T 12221 standard)
Body Material	Cast iron, ductile iron, carbon steel, stainless steel
Seat Material	EPDM (standard), NBR, FKM, PTFE
Stem Material	Stainless steel (2Cr13, 304, 316, etc.)
Leakage Class	ANSI Class VI (bubble-tight)
Testing Standard	GB/T 13927, API 598, ISO 5208

Typical Applications

Water Treatment– Water supply and drainage systems, wastewater plants
Chemical Industry– Various chemical media transportation
HVAC Systems– Chilled and hot water circulation
Power Industry– Cooling water systems
Food & Pharmaceutical– Sanitary pipeline systems
Petrochemical– Oil and gas pipelines
Shipbuilding– Seawater systems
Irrigation Systems– Agricultural irrigation networks

Working Principle

The Soft Seal Lug Butterfly Valve operates by rotating the stem to drive the disc through 90° rotation for opening/closing. When open, the disc aligns parallel to the pipeline axis for smooth media flow; when closed, the disc becomes perpendicular to the axis, achieving sealing through contact between the resilient seat and disc edge. The lug-type design features threaded holes at both ends for direct bolting to pipeline flanges without requiring downstream nuts.

Structural Features