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PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve
  • PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve
  • PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve
  • PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve
  • PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve
  • PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve

PN40 Wcb Flanged DIN 3356 Standard Bellow Seal Bonnet Globe Valve

Product Attribute: Size:2-24inch (DN15-DN600)
Pressure:Pn 16-Pn420
Actuator:Manual
Material:Carbon Steel
Structure:Bellow Seal Globe Valve
Sealing Form:Bellows Globe Valve
Stem Thread Position:Outside Screw Stem Globe Valve
Application:Bellows Globe Valve
Standard:DIN
Product Name:Bellow Seal Globe Valve
Materials:GS-C25,CF8,CF3,etc
Design Temperature:-29ºC -593ºC
Operation:Manual
Design Standard:DIN3356
Face to Face Dimension:DIN3202
Flange Ends:DIN2543-2545
Test:DIN3230
Standard Flanges:DIN
Sample:Available
Certificates:SGS/CE,ISO
Specification:DN15-DN500
INFO@TYFLUIDGROUP.COM

Specification

DN15~DN500 PN16~PN40 GS-C25/WCB Flanged DIN 3356 Bellow Seal Bonnet Globe Valve

I. Product Overview

TIANYU bellow seal bonnet globe valve is a high-reliability flow control solution engineered for high-temperature and medium-pressure industrial systems. Crafted with GS-C25 carbon steel, WCB, or stainless steel (CF8/CF3), it features a  bellow seal structure, flanged connection, and DIN 3356 standard design to ensure precise on-off and throttling control of water, steam, oil, and other high-temperature media. Operating at -29℃~593℃ and PN16~PN40 pressure, it leverages a  bellow assembly to replace traditional packing seals, eliminating stem leakage—a common issue in conventional globe valves. Compliant with DIN 3356, DIN 3202, and DIN 3230 standards, it is ideal for power generation, chemical processing, petroleum, and heating industries where zero leakage and high-temperature resistance are critical.

II. Key Attribute Parameters

  • Size Range: DN15~DN500 (1/2″~20″), covering small to large-diameter pipelines for diverse high-temperature flow control needs.
  • Pressure Range: PN16~PN40 (1.6MPa~4.0MPa), adapting to medium-pressure systems such as steam pipelines and industrial heating loops.
  • Temperature Range: -29℃~593℃, with GS-C25/WCB handling up to 425℃, stainless steel (CF8) extending to 593℃ for extreme high-temperature media.
  • Material Configuration:
    • Body & Bonnet: GS-C25 carbon steel (general high-temperature use), WCB (enhanced strength), CF8/CF3 stainless steel (corrosive high-temperature media).
    • Bellow: Stainless steel 321 (resistant to high-temperature oxidation) or 316 (corrosion resistance), ensuring flexibility and sealing under thermal cycling.
    • Disc & Seat: WCB or stainless steel, with metal-to-metal sealing for high-temperature applications, optional PTFE coating for tight shut-off in low-temperature scenarios.
    • Stem: Stainless steel 316, connected to the bellow to prevent media contact and leakage.
    • End Connections: Flanged (per DIN 2543-2545), ensuring leak-tight integration with pipelines.
  • Actuation: Manual (handwheel), with outer screw and yoke (OS&Y) design for clear visual indication of valve position (open/closed).
  • Design & Test Standards: Design follows DIN 3356; face-to-face dimensions per DIN 3202; testing complies with DIN 3230 (hydrostatic shell test at 1.5×rated pressure).

Product Overview

III. Features Description

  • Bellow Seal Zero Leakage: The stainless steel bellow is welded between the stem and bonnet, forming a hermetic barrier that eliminates stem leakage—unlike traditional packing seals that degrade over time. This is critical for toxic, flammable, or high-value media (e.g., high-pressure steam in power plants).
  • High-Temperature Stability: The bellow is designed to withstand thermal expansion/contraction (-29℃~593℃) without fatigue, avoiding cracks or loss of sealing. GS-C25/WCB bodies retain strength at high temperatures, resisting deformation under PN40 pressure.
  • Precise Throttling Performance: Globe valve structure (disc perpendicular to flow) enables fine flow adjustment, with a linear flow characteristic that simplifies control in steam regulation or chemical dosing systems—outperforming ball valves for throttling needs.
  • OS&Y Operation: Outer screw stem design allows visual confirmation of valve position (stem extends/retracts with handwheel rotation), reducing operational errors in industrial settings where valve status is critical.
  • Flange Compatibility: DIN 2543-2545 flanges fit seamlessly into European standard pipelines, avoiding adaptation issues in projects using DIN specifications—common in chemical and power industries.

IV. Manufacturing Processes

  • Material Validation: GS-C25/WCB castings undergo ultrasonic testing to detect internal defects. Chemical analysis verifies carbon content (GS-C25: 0.22~0.29%) to ensure high-temperature strength. Stainless steel bellows are tested for fatigue resistance (≥10,000 thermal cycles).
  • Bellow Forming: Stainless steel 321/316 sheets are rolled into seamless tubes, then hydraulically formed into corrugated bellows. Welding (TIG) connects the bellow to the stem and bonnet, with helium leak testing (≤1×10⁻⁹ Pa·m³/s) to ensure hermetic sealing.
  • Precision Machining: Disc and seat sealing surfaces are CNC-ground to Ra ≤1.6μm, ensuring tight contact. The valve body’s flow channel is polished to reduce turbulence, enhancing throttling accuracy.
  • Assembly & Testing:
    • Hydrostatic Test: Body tested at 1.5×rated pressure (e.g., 6.0MPa for PN40) for 30 minutes; seat tested at 1.1×rated pressure (4.4MPa for PN40) with water to confirm no leakage.
    • High-Temperature Test: Valve is heated to 593℃ (for stainless steel models) and operated to verify bellow flexibility and sealing integrity.
    • Operation Test: 100+ open/close cycles to ensure smooth stem movement and consistent throttling performance.

Valve Details

V. Product Advantages

  • Zero Leakage Reliability: Bellow seal design eliminates stem leakage, reducing media loss by 100% compared to packing-sealed globe valves—critical for steam systems where energy waste or safety risks are a concern.
  • Long Service Life: Stainless steel bellows resist high-temperature fatigue and corrosion, extending service life to 8~10 years (2× longer than traditional valves) in high-temperature cycling environments.
  • High-Temperature Adaptability: Withstands up to 593℃, avoiding seal failure in superheated steam pipelines (common in power plants) where conventional valves degrade.
  • Precise Flow Control: Globe valve structure and linear flow characteristic enable accurate throttling, reducing energy consumption in heating systems by 15% through optimized flow regulation.
  • Safety & Compliance: DIN standard compliance ensures compatibility with European industrial systems, while zero leakage minimizes environmental and safety risks in chemical/petrochemical plants.

Application

VI. Application Fields

  • Power Generation: Controls superheated steam flow in boiler feedwater and turbine auxiliary systems, with bellow seals preventing steam leakage and energy loss.
  • Chemical Processing: Regulates high-temperature chemical reactants (e.g., molten sulfur, hot oil) in synthesis lines, leveraging stainless steel materials to resist corrosion.
  • Petroleum Refining: Manages high-temperature oil and gas flow in distillation units, with high-pressure resistance (PN40) adapting to refinery pipeline conditions.
  • Industrial Heating: Adjusts hot water or thermal oil flow in district heating networks, using precise throttling to maintain stable temperatures.
  • Food & Beverage: Controls clean steam flow in sterilization systems, with zero leakage ensuring no contamination of food-grade media.

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