Specification

DN15~DN400 PN16~PN64 GS-C25/WCB DIN Flanged Bellow Seal Globe Valve

I. Product Overview

TIANYU DIN flanged bellow seal globe valve is a high-reliability flow control solution engineered for industrial pipelines requiring zero leakage and stable performance. Crafted with GS-C25 carbon steel, WCB, and stainless steel (1.4308/1.4408), it features a bellow seal structure and flanged connection to ensure precise on-off and throttling control of water, oil, gas (WOG), and other industrial media. Operating at normal temperature and PN16~PN64 pressure, it leverages a stainless steel (304/316) bellow to replace traditional packing seals, eliminating stem leakage—a common flaw in conventional globe valves. Compliant with DIN EN 13709 and API standards, it is ideal for metallurgy, electric power, light industry, and general industrial systems where sealing reliability and pressure resistance are critical.

II. Key Attribute Parameters

Size Range: DN15~DN400, covering small to large-diameter pipelines for diverse industrial flow control needs.
Pressure Range: PN16~PN64 (1.6MPa~6.4MPa), adapting to low to medium-high pressure systems such as power plant auxiliary pipelines and industrial oil lines.
Temperature Range: Normal temperature (typically -20℃~200℃), with material options (e.g., 1.4408 stainless steel) extending suitability to moderately high-temperature media.
Material Configuration:
- Body & Bonnet: GS-C25 (cost-effective carbon steel), WCB (enhanced strength), 1.4308/1.4408 stainless steel (corrosion resistance for humid or mild chemical environments).
- Bellow Unit: 304/316 stainless steel, forming a hermetic barrier between stem and media to prevent leakage; 316 offers superior corrosion resistance for harsh conditions.
- Disc & Stem: GS-C25 or stainless steel (13Cr/304/316), ensuring wear resistance and compatibility with media.
- Sealing Components: Packing (flexible graphite/PTFE) and gaskets (graphite+stainless steel/PTFE) enhance secondary sealing, complementing the bellow.
- End Connections: Flanged (RF/RTJ) per DIN EN 1092-1, with butt welding (BW) optional for high-pressure applications.
Actuation: Manual (handwheel), with outer screw stem design for clear visual indication of valve position (open/closed).
Design & Test Standards: Design follows DIN EN 13709; face-to-face dimensions per DIN EN 588-1; testing complies with API standards to ensure performance.

Product Overview

III. Features Description

Bellow Seal Zero Leakage: The 304/316 stainless steel bellow is welded between the stem and bonnet, forming a permanent seal that eliminates stem leakage—unlike traditional packing seals that degrade over time. This is critical for WOG media, where even minor leakage risks safety or environmental hazards.
Dual Sealing Backup: Bellow (primary) and packing (secondary) create a redundant sealing system. If the bellow is damaged, the packing prevents immediate leakage, providing time for maintenance and avoiding unplanned shutdowns.
Outer Screw Stem Design: The stem screw is external, avoiding contact with media and reducing wear from corrosion or abrasion. This extends stem life and ensures smooth operation, even in dusty industrial environments.
DIN Standard Compatibility: Flange dimensions and face-to-face lengths comply with DIN standards, fitting seamlessly into European industrial pipelines. This avoids adaptation issues in cross-border projects, simplifying installation.
Material Versatility: GS-C25/WCB for general industrial use, 1.4408 stainless steel for corrosive media—allowing customization to match specific media properties (e.g., humid air, light oils, or water).

IV. Manufacturing Processes

Material Validation: GS-C25/WCB castings undergo ultrasonic testing to detect internal defects; stainless steel components (bellow, stem) are tested for chemical composition to ensure corrosion resistance.
Bellow Forming: 304/316 sheets are rolled into tubes, then hydraulically formed into corrugated bellows. TIG welding connects the bellow to the stem and bonnet, with helium leak testing (≤1×10⁻⁹ Pa·m³/s) to verify hermetic sealing.
Precision Machining: Body flanges and flow channels are CNC-machined to DIN EN 1092-1 dimensions, with bolt holes aligned to ±0.5mm for easy installation. Disc and seat surfaces are ground to Ra ≤1.6μm for tight contact.
Assembly & Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure (e.g., 9.6MPa for PN64) for 30 minutes; seat tested at 1.1×rated pressure with water to confirm no leakage.
- Operation Test: 100+ open/close cycles to ensure smooth stem movement and consistent sealing, with focus on outer screw stem reliability.
- Coating Application: Epoxy painting (custom colors optional) protects the exterior from rust, extending service life in outdoor or humid environments.

Valve Details

V. Product Advantages

Leakage Elimination: Bellow seal design reduces media loss to near-zero, lowering operational costs (e.g., reducing oil/gas waste) and minimizing safety risks in industrial settings.
Long Service Life: Stainless steel bellow resists fatigue and corrosion, lasting 8~10 years—twice the lifespan of packing-sealed valves in similar applications.
Low Maintenance: Outer screw stem avoids media contact, reducing wear and maintenance frequency. The dual sealing system provides fault tolerance, reducing emergency repair needs.
Wide Pressure Adaptability: PN16~PN64 range covers low to medium-high pressure systems, eliminating the need for multiple valve types in a single industrial plant.
Global Compatibility: DIN standard compliance enables integration into European and international pipelines, supporting cross-border projects without design modifications.

Application

VI. Application Fields

Metallurgy Industry: Controls cooling water and hydraulic oil flow in steel mills, with GS-C25 body resisting industrial dust and 304 bellow avoiding leakage in high-pressure circuits.
Electric Power Systems: Regulates water and light oil flow in power plant auxiliary pipelines (e.g., boiler feedwater), leveraging DIN compatibility for seamless integration with existing infrastructure.
Light Industry: Manages compressed air and process water flow in food, textile, or packaging factories, where zero leakage prevents product contamination and maintains system efficiency.
General Industrial Piping: Handles WOG media in manufacturing plants, with material options (e.g., 1.4408) adapting to humid or mildly corrosive environments (e.g., coastal factories).
Heating Systems: Controls hot water flow in district heating networks, with flexible graphite packing and bellow ensuring sealing stability under temperature fluctuations.

TIANYU DN15~DN400 PN16~PN64 bellow seal globe valve: GS-C25/WCB, DIN flanged. 304/316 bellow for zero leakage, dual sealing. Manual operation, DIN compliant. Ideal for metallurgy, power, light industry. Customizable: material (1.4408 for corrosion), connection (BW) to fit specific media/pressure needs.