Product Overview

DN15~DN350 PN16~PN40 High Performance Zero-Leakage Bellow Seal Hot Oil Globe Valve

I. Product Overview

NEWWAY high performance zero-leakage bellow seal globe valve is a specialized flow control solution engineered for hot oil systems and high-temperature industrial pipelines. Crafted with carbon steel (GS-C25) and stainless steel (SS304, SS321, 1.4401), it features a bellow seal structure and flanged connection to ensure precise on-off and throttling control of hot oil, as well as other high-temperature media like steam and industrial fluids. Operating at -20℃~425℃ and PN16~PN40 pressure, it leverages a stainless steel bellow (SS321/SS316) to replace traditional packing seals, eliminating stem leakage—a critical issue in conventional valves handling hot oil. Compliant with DIN, GB, ANSI, and JIS standards, it is ideal for petroleum refining, chemical processing, industrial heating, and energy industries where zero leakage and high-temperature stability are essential.

II. Key Attribute Parameters

Size Range: DN15~DN350, covering small to medium-diameter pipelines for hot oil transfer and control.

Pressure Range: PN16~PN40 (1.6MPa~4.0MPa), adapting to medium-pressure systems such as hot oil circulation loops and industrial heating pipelines.

Temperature Range: -20℃~425℃, with SS321 bellow and 1.4401 body retaining stability in high-temperature cycling—critical for hot oil (typically 200℃~350℃).

Material Configuration:

Body & Bonnet: GS-C25 (cost-effective for general hot oil), SS304/1.4401 (corrosion resistance), SS321 (high-temperature oxidation resistance).

Bellow: SS321 (primary, withstands 425℃) or SS316 (corrosive hot media), ensuring flexibility under thermal expansion.

Disc & Seat: 2Cr13, Stellite (Stl) for wear resistance; metal-to-metal sealing adapts to high-temperature hot oil without soft seal degradation.

Stem: 1.4401/2Cr13, connected to bellow to isolate from hot oil and prevent leakage.

End Connections: Flanged (per DIN/ANSI standards), ensuring leak-tight integration with hot oil pipelines.

Actuation: Manual (handwheel), with smooth operation even under high-temperature conditions.

Design & Test Standards: Design follows DIN/GB/ANSI; testing includes hydrostatic strength (1.4×PN) and sealing (1.0×PN) per industry standards.

III. Features Description

Dual Sealing Zero Leakage: Combines bellow seal (primary) and packing seal (secondary) to eliminate stem leakage. The SS321 bellow forms a hermetic barrier, avoiding hot oil seepage that could cause energy loss or safety hazards—unlike traditional packing seals that harden and leak under high temperature.

Scraping Disc Design: The disc features a unique scraping edge that cleans the seat surface during operation, removing coked oil residues (common in hot oil systems) and reducing wear. This extends seal life by 50% compared to standard discs.

High-Temperature Bellow Stability: SS321 bellow resists creep and oxidation at 425℃, maintaining flexibility through 10,000+ thermal cycles (hot oil heating/cooling). It compensates for stem expansion, avoiding seal failure from temperature-induced deformation.

Lightweight & Easy Operation: Optimized body structure reduces weight by 15% vs. conventional globe valves, making manual operation easier—critical for large-diameter valves in hot oil plants where frequent adjustment is needed.

Wide Standard Compatibility: Complies with DIN, GB, ANSI, and JIS, fitting seamlessly into global hot oil systems. Flange dimensions match pipeline standards, avoiding adaptation issues in cross-border projects.