Specification

PN16 Y Type Manual Butt Welded Bellow Seals Globe Valve

I. Product Overview

NEWWAY PN16 Y type bellow seal globe valve is a versatile flow control solution engineered for industrial pipelines, featuring manual operation and dual connection options (flange, butt welded). Crafted with WCB, stainless steel, and forged steel, it combines a Y-type flow path with a bellow seal structure to balance precise regulation and zero leakage. Operating at -20℃~425℃, it leverages a stainless steel bellow to eliminate stem leakage—critical for media like water, steam, and light oil. Compliant with international standards, it is ideal for general industrial systems, heating circuits, and medium-pressure pipelines, where reliable sealing and flexible installation are key.

II. Key Attribute Parameters

Size Range: Covering common industrial diameters (e.g., DN80), adaptable to small to medium pipelines.

Pressure Rating: PN16 (1.6MPa), suitable for low to medium-pressure systems such as heating networks and auxiliary steam lines.

Temperature Range: -20℃~425℃, with WCB/stainless steel retaining stability in high-temperature media like steam.

Material Configuration:

Body: WCB (cost-effective), stainless steel (corrosion resistance), or forged steel (enhanced strength).

Bellow: Stainless steel, forming a hermetic barrier between stem and media to prevent leakage.

Seal: Stainless steel or Stellite (wear-resistant), ensuring tight shut-off under frequent operation.

Stem: Stainless steel, isolated from media by the bellow to avoid corrosion and ensure smooth movement.

Connection Types: Flange (for easy disassembly) and butt welded (for leak-tight, permanent installation).

Actuation: Manual (handwheel), with intuitive operation for precise flow adjustment.

Design Standards: Complies with industrial norms for dimensions and performance, ensuring compatibility with global pipelines.

Product Overview

III. Features Description

Y-Type Flow Path: The angled flow channel reduces media turbulence, lowering pressure drop by 25% compared to straight globe valves. This minimizes energy loss in circulation systems, ideal for heating or cooling loops.

Bellow Seal Zero Leakage: The stainless steel bellow is welded to the stem and bonnet, eliminating stem leakage—unlike packing seals that require frequent maintenance. This is critical for preventing steam or oil loss.

Dual Connection Flexibility: Flange connections enable easy installation and maintenance, while butt welded connections provide permanent, leak-tight integration for high-stability pipelines.

Manual Operation Reliability: The handwheel design ensures smooth, precise flow control, even in tight spaces. The stem’s low friction guarantees consistent operation over time.

Durable Construction: WCB/stainless steel bodies resist corrosion and high temperatures; Stellite seals withstand wear, extending service life in industrial environments.

IV. Manufacturing Processes

Material Inspection: WCB and stainless steel undergo chemical analysis and ultrasonic testing to detect defects, ensuring mechanical strength and corrosion resistance.

Bellow Forming: Stainless steel sheets are rolled into corrugated bellows, then TIG-welded to the stem and bonnet. Helium leak testing confirms hermetic sealing.

Precision Machining: Y-type flow paths are CNC-machined to smooth finishes (Ra ≤1.6μm) to reduce pressure drop. Flange faces and welded ends are processed to strict tolerances for tight connections.

Assembly & Testing:

Components are assembled with torque-controlled fasteners, ensuring bellow alignment to avoid fatigue.

Hydrostatic test: Body tested at 2.4MPa (1.5×PN16) for 30 minutes; seat tested at 1.76MPa (1.1×PN16) to verify no leakage.

Operation test: 100+ open/close cycles confirm smooth handwheel operation and consistent sealing.