Specification

1/2″~20″ DIN/ANSI Cast Steel Bellow Seal Globe Valve

I. Product Overview

TIANYU DIN/ANSI cast steel bellow seal globe valve is a versatile flow control solution engineered for industrial pipelines handling water, oil, and other common media. Crafted with cast steel (WCB) and stainless steel (CF8), it features a bellow seal structure and flange connection to ensure precise shutoff and flow regulation. Operating at ordinary temperature and suit medium-pressure systems, it leverages a 304 stainless steel bellow to replace traditional packing seals, eliminating stem leakage—a key advantage over conventional valves. Compliant with DIN, ANSI, and API standards, it is ideal for petroleum, chemical, power generation, and water treatment industries where sealing reliability and global standard compatibility are critical.

II. Key Attribute Parameters

Size Range: 1/2″~20″ (DN15~DN500), covering small to large-diameter pipelines for diverse industrial flow control needs.
Pressure Adaptability: Suitable for medium-pressure systems (typically PN10~PN40), adapting to water supply, oil transmission, and general industrial pipelines.
Temperature Range: Ordinary temperature (-10℃~80℃), with WCB/CF8 materials retaining stability in ambient and moderately heated media.
Material Configuration:
- Body: WCB (cost-effective cast steel) or CF8 (stainless steel for corrosion resistance), ensuring structural strength and compatibility with common media.
- Disc: A105+13Cr (wear-resistant) or CF8 (corrosion-resistant), with precision machining for tight sealing.
- Stem: 2Cr13/304 stainless steel, connected to the bellow to avoid media erosion and ensure smooth operation.
- Bellow: 304 stainless steel, forming a hermetic barrier between stem and media to prevent leakage.
- End Connections: Flanged (per DIN/ANSI standards), enabling secure integration with global industrial pipelines.
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, ANSI standards; testing complies with DIN EN 12266 to ensure pressure resistance and sealing performance.

Product Overview

III. Features Description

Bellow Seal Zero Leakage: The 304 stainless steel bellow is welded to the stem and bonnet, creating a permanent seal that eliminates stem leakage. Unlike packing seals that require frequent maintenance, the bellow retains integrity over long-term use—critical for preventing oil or water loss in industrial systems.
Dual Sealing Backup: Bellow (primary) and stem packing (secondary) form a redundant sealing system. If the bellow is damaged, the packing prevents immediate leakage, providing time for scheduled maintenance and avoiding unplanned shutdowns.
Global Standard Compatibility: Flange dimensions comply with DIN and ANSI, fitting seamlessly into European and North American pipelines. This avoids adaptation issues in cross-border projects, simplifying installation and reducing costs.
Precision Flow Regulation: The globe valve’s linear disc movement enables fine-tuned flow adjustment, with a linear flow characteristic that simplifies control of water or oil flow—essential for maintaining stable pressure in process systems.
Robust Structural Design: Heavy-duty cast steel body resists deformation under pressure; Cr13 seat enhances wear resistance, ensuring long-term sealing performance even with frequent operation.

IV. Manufacturing Processes

Material Validation: WCB and CF8 castings undergo ultrasonic testing to detect internal defects. Chemical analysis verifies alloy content (e.g., WCB carbon content ≤0.30%) to ensure mechanical strength.
Bellow Forming: 304 stainless steel 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 confirm hermetic sealing.
Precision Machining: Valve body flow channels and flange faces are CNC-machined to DIN/ANSI dimensions, with bolt holes aligned to ±0.5mm tolerance. Disc and seat surfaces are ground to Ra ≤1.6μm for uniform contact and tight shutoff.
Assembly & Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure for 30 minutes; seat tested at 1.1×rated pressure with water to verify no leakage.
- Operation Test: 100+ open/close cycles confirm smooth stem movement, with focus on linear regulation accuracy and sealing consistency.
- Surface Treatment: The exterior is painted with anti-corrosion epoxy to resist rust, extending service life in humid or outdoor environments.

Valve Details

V. Product Advantages

Leakage Elimination: Bellow seal design reduces media loss to near-zero, lowering operational costs (e.g., reducing water or oil waste) and minimizing environmental risks in industrial settings.
Long Service Life: 304 bellow resists corrosion and fatigue, lasting 8~10 years—twice the lifespan of packing-sealed valves in similar applications. Cr13 seat enhances wear resistance, reducing maintenance frequency.
Global Versatility: DIN/ANSI compatibility enables use in international projects, from European chemical plants to North American water treatment facilities, avoiding design modifications.
Easy Maintenance: Outer screw stem avoids media contact, reducing wear; flanged connection allows in-line disassembly for component replacement, cutting downtime.
Reliable Performance: Each valve undergoes strict pressure and sealing tests before delivery, ensuring compliance with industry standards and stable operation in critical pipelines.

Application

VI. Application Fields

Petroleum Industry: Controls oil flow in storage and transmission lines, with WCB body resisting oil erosion and bellow seal preventing leaks that could cause environmental hazards.
Chemical Processing: Regulates water and light chemical flow in reaction systems, with CF8 material option resisting mild corrosion and ensuring media purity.
Power Generation Auxiliary Systems: Manages cooling water flow in power plant circuits, leveraging precise regulation to maintain optimal equipment temperatures and bellow seal to avoid water loss.
Water Treatment: Controls clean water and wastewater flow in distribution networks, with corrosion-resistant materials ensuring long-term performance in humid environments.
Industrial Heating: Adjusts hot oil flow in heating loops, using precise throttling to maintain stable temperatures and dual sealing to prevent energy waste.

TIANYU 1/2″~20″ globe valve: WCB/CF8, bellow seal, DIN/ANSI. 304 bellow for zero leakage, dual sealing. Precise flow control, suit water/oil. Ideal for petroleum, chemical, power. Customizable: material (CF8 for corrosion), flange (DIN/ANSI) to fit industrial pipelines.