Specification

DN15~DN350 PN16~PN40 Cast Steel Angle Type Bellow Seal Globe Valve

I. Product Overview

TIANYU angle type bellow seal globe valve is a specialized flow control solution engineered for industrial pipelines requiring space-saving installation and zero leakage. Crafted with cast steel (GS-C25) and stainless steel (SS304, SS321, 1.4401), it features an angle-type structure (90° flow path) and 波纹管密封（bellow seal）design to ensure precise on-off and throttling control of water, steam, hot oil, and other industrial media. 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. Compliant with DIN, EN, and WRAS standards, it is ideal for water treatment, HVAC, industrial steam systems, and petroleum refining, where space constraints and sealing reliability are key.

II. Key Attribute Parameters

Size Range: DN15~DN350, covering small to medium-diameter pipelines for diverse industrial flow control needs.
Pressure Range: PN16~PN40 (1.6MPa~4.0MPa), adapting to medium-pressure systems such as steam pipelines and hot oil circulation loops.
Temperature Range: -20℃~425℃, with SS321 bellow and 1.4401 body retaining stability in high-temperature cycling—suitable for steam (up to 425℃) and hot oil.
Material Configuration:
- Body & Bonnet: GS-C25 cast steel (general industrial use), SS304/1.4401 (corrosion resistance), SS321 (high-temperature oxidation resistance).
- Bellow: SS321 (primary, withstands 425℃) or SS316 (corrosive media), ensuring flexibility under thermal expansion.
- Disc & Seat: 2Cr13, Stellite (Stl) for wear resistance; metal-to-metal sealing adapts to high temperatures without soft seal degradation.
- Stem: 1.4401/2Cr13, connected to bellow to isolate from media and prevent leakage.
- End Connections: Flanged (per EN 1092-B1), enabling secure integration with pipelines.
Actuation: Manual (handwheel), with non-rising handwheel design for space-saving and clear operation.
Design & Test Standards: Design follows DIN 3352, EN 13709; testing complies with EN 12266 (hydrostatic strength test at 1.4×PN).

Product Overview

III. Features Description

Angle-Type Flow Path: 90° elbow-integrated structure eliminates the need for separate pipe elbows, saving 30% installation space in tight pipelines (e.g., HVAC system corners or equipment skids). The streamlined flow path reduces pressure drop by 15% compared to straight-through globe valves.
Bellow Seal Zero Leakage: Combines bellow seal (primary) and packing seal (secondary) to eliminate stem leakage. The SS321 bellow forms a hermetic barrier, avoiding media seepage—critical for steam or hot oil systems where leakage risks energy loss or safety hazards.
Scraping Disc Design: The disc features a unique edge that cleans the seat surface during operation, removing coked oil or scale (common in high-temperature media) and extending seal life by 50% compared to standard discs.
High-Temperature Stability: SS321 bellow resists creep and oxidation at 425℃, maintaining flexibility through 10,000+ thermal cycles. Cast steel body retains strength under high pressure, avoiding deformation in PN40 systems.
Wide Certification Compliance: WRAS certification ensures suitability for drinking water systems; CE, DNV, and ABS certifications meet industrial and marine safety standards, enabling global application.

IV. Manufacturing Processes

Material Validation: GS-C25/SS321 materials undergo spectral analysis to verify alloy content (e.g., SS321 contains Ti to resist intergranular corrosion). Bellows are tested for fatigue resistance via 10,000 thermal cycles at 425℃.
Bellow Forming: SS321 sheets are rolled into tubes, then hydraulically formed into corrugated bellows. TIG welding connects the bellow to stem and bonnet, with helium leak testing (≤1×10⁻⁹ Pa·m³/s) to ensure hermetic sealing.
Precision Machining: The 90° flow path is CNC-machined to ensure smooth media flow; disc and seat are ground to Ra ≤1.6μm for tight contact. The disc’s scraping edge is honed to 0.8μm roughness to avoid seat damage.
Assembly & Testing:
- Hydrostatic Test: Body tested at 1.4×PN (e.g., 5.6MPa for PN40) for 30 minutes; seat tested at 1.0×PN with media (steam/hot oil) to simulate real conditions.
- High-Temperature Operation Test: Valve is heated to 425℃, operated 100+ cycles to verify bellow flexibility and sealing.
- Gas Seal Test: 0.5MPa air test confirms no leakage at stem and flange connections.

Valve Details

V. Product Advantages

Space-Saving Installation: Angle-type design eliminates pipe elbows, reducing pipeline complexity and installation costs in compact spaces (e.g., ship engine rooms or industrial skids).
Zero Leakage Reliability: Dual sealing ensures no media loss, reducing energy waste by 20% in steam systems and avoiding environmental risks in chemical applications.
Resistance to Fouling: Scraping disc prevents scale or coking buildup, maintaining performance and reducing maintenance frequency in high-temperature media.
Wide Media Compatibility: From drinking water (WRAS certified) to high-temperature steam and hot oil, the valve adapts to diverse media, avoiding the need for multiple valve types.
Durable in Harsh Conditions: SS321 bellow and wear-resistant materials extend service life to 8~10 years—twice that of standard globe valves in high-temperature cycling environments.

Application

VI. Application Fields

Water Treatment: Controls potable water and wastewater flow in distribution systems, with WRAS certification ensuring compliance with drinking water regulations and zero contamination risk.
HVAC & Building Systems: Regulates hot water and steam flow in heating/cooling loops, leveraging angle-type design to fit in ceiling or wall-mounted pipelines with limited space.
Industrial Steam Systems: Manages superheated steam flow in power plants and factories, with high-temperature bellow and metal sealing adapting to 425℃ media without leakage.
Petroleum Refining: Controls hot oil flow in distillation units, where scraping disc design avoids coked oil buildup and angle structure saves space in pipeline clusters.
Marine Engineering: Used in shipboard pipelines (e.g., ballast, cooling systems), with DNV/ABS certification ensuring reliability in saltwater and vibration-prone environments.