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Single -crop control valve of the LN81 series

The LN81 series, one of the two fundamental pressure-unbalanced single-seat designs in the LN8 product line, features a top-guided plunger valve core, floating compression sleeve, self-aligning seat structure, and modular construction. This high-performance control valve delivers exceptional flow capacity, precise regulation, wide adjustable range (including minimal flow control), along with simple/reliable structure, excellent sealing performance, and easy field maintenance – making it ideal for applications with moderate pressure differentials but stringent requirements for seat leakage and control accuracy.

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Model:
LN81

Adopts modular design philosophy, combining Japanese/American high-precision control technology with German modular concepts;
Features S-shaped flow path inside valve body for smooth, dead-zone-free media passage; Internal guide vanes reduce fluid interaction forces and minimize cavitation;
Simplified structure with minimal internal dead zones, reducing media crystallization and clogging risks;
Upper-guided stem design ensures stable guidance;
Floating seat design with conical sealing surface guarantees perfect alignment of sealing pairs;
Precisely controlled flow characteristics via specially profiled plug;
Optional flow characteristics: Equal percentage, linear, and quick-opening;
Wide temperature range coverage (-196°C to 593°C) with corresponding structural options;
Leakage rates comply with GB/T 17213.4-2005 / IEC 60534-4:1999 (Class IV/V for metal seats, Class VI for quick-opening/soft-seated versions);
Connection types: RF/RJ/FM flanges or SW/BW welding ends;
Face-to-face dimensions meet:
• GB/T 17213.3-2005 / IEC 60534-3-1:2000; or
• ISA S75.03-1992 standards.