Beschreibung
High-Pressure Alloy Steel Gate Valve for Power Generation, Steam, and High-Temperature Service
Der Bolzen-Motorhaubenschieber, ASTM A217 WC6, 14 Inch, Class 900 LB, Butt Weld (BW) End is a heavy-duty isolation valve specifically engineered for high-pressure and high-temperature applications. Manufactured from ASTM A217 WC6 chrome-moly alloy steel, this valve offers exceptional strength, creep resistance, and long-term reliability in demanding services such as power generation, refinery processing, petrochemical plants, and high-temperature steam systems.
Designed in accordance with API 600, ASME B16.34, Und ASME B16.25, the Ventil provides reliable bidirectional shutoff, low pressure drop, and excellent structural integrity under severe operating conditions.
Product Overview
| Item | Spezifikation |
|---|---|
| Product Type | Bolzen-Motorhaubenschieber |
| Ventilgröße | 14 Inch (DN350) |
| Druckrate | ASME Class 900 LB |
| Body Material | ASTM A217 WC6 |
| Bonnet Type | Verschraubte Motorhaube |
| Disc Type | Flexible Wedge |
| Verbindung beenden | Butt Weld (BW) |
| Designstandard | API 600 |
| Face-to-Face | ASME B16.10 |
| Butt Weld Ends | ASME B16.25 |
| Testing Standard | API 598 |
| Pressure-Temperature | ASME B16.34 |
| Betrieb | Handwheel, Gear, Electric Actuator |
| Applicable Media | Steam, Hot Oil, High-Temperature Fluids |
Product Features
ASTM A217 WC6 Alloy Steel Construction
WC6 is a chromium-molybdenum alloy steel widely used in elevated-temperature service.
Benefits include:
- Excellent creep resistance
- Superior thermal stability
- High-pressure capability
- Enhanced oxidation resistance
- Long service life in steam applications
Class 900 Pressure Rating
Designed for severe operating conditions:
- High-pressure steam systems
- Power station pipelines
- Refinery process lines
- High-temperature utility systems
The Class 900 rating provides outstanding strength and pressure containment.
Flexible Wedge Gate Design
The flexible wedge ensures:
- Tight shutoff performance
- Improved seat contact
- Compensation for thermal expansion
- Reduced operating torque
- Enhanced sealing reliability
Butt Weld End Connection
BW ends provide:
- Permanent leak-free joints
- High structural integrity
- Reduced maintenance requirements
- Excellent performance under thermal cycling
Technische Spezifikationen
Materials of Construction
| Component | Material |
|---|---|
| Körper | ASTM A217 WC6 |
| Motorhaube | ASTM A217 WC6 |
| Wedge | ASTM A217 WC6 + Stellite |
| Seat Ring | 13Cr / Stellite Overlay |
| Stengel | ASTM A182 F6a |
| Dichtung | Spiral Wound SS/Graphite |
| Verpackung | Flexible Graphite |
Design Standards
| Standard | Beschreibung |
|---|---|
| API 600 | Steel Gate Valve Design |
| ASME B16.34 | Valve Design Requirements |
| ASME B16.10 | Face-to-Face Dimensions |
| ASME B16.25 | Butt Weld Ends |
| API 598 | Inspection & Testing |
| MSS SP-61 | Pressure Testing |
Working Principle
The gate valve operates through a linear-motion mechanism.
Opening
- Handwheel rotates stem.
- Wedge rises vertically.
- Flow path becomes fully open.
- Minimal pressure drop occurs.
Closing
- Stem lowers wedge.
- Wedge contacts seat rings.
- Tight shutoff is achieved.
- Flow is completely isolated.
Because the gate is fully removed from the flow path when open, pressure losses are extremely low.
Typical Applications
Thermal Power Plants
WC6 gate valves are extensively used in:
- Main steam lines
- Reheat steam systems
- Boiler outlet piping
- Turbine inlet systems
Application Example
Petrochemical Industry
Suitable for:
- High-temperature process lines
- Hydrocarbon processing
- Utility steam networks
- Cracking units
Application Example
Oil Refining Facilities
Used in:
- Process isolation
- Steam tracing systems
- High-pressure utility services
- Heat recovery systems
Industrial Steam Systems
Ideal for:
- Superheated steam
- High-pressure steam distribution
- Heat transfer systems
- Industrial boilers
Installation Guide
Proper installation is essential for maximizing valve performance and service life.
Recommended Installation Practices
Pipeline Preparation
- Clean piping thoroughly before installation.
- Remove welding slag and debris.
- Verify alignment of piping ends.
Welding Requirements
- Follow qualified welding procedures.
- Apply appropriate preheating and PWHT when required.
- Protect internal sealing surfaces during welding.
Flow Direction
- Install according to manufacturer recommendations.
- Generally suitable for bidirectional service.
Stem Position
- Preferred installation is vertical stem upward.
- Horizontal installation may be acceptable based on application requirements.
Installation Example
Advantages of WC6 Gate Valves
| Feature | Benefit |
|---|---|
| Alloy Steel Construction | High-temperature strength |
| Class 900 Rating | High-pressure performance |
| Flexible Wedge Design | Improved sealing reliability |
| Butt Weld Ends | Leak-free installation |
| Full Port Design | Minimal pressure drop |
| Stellite Seating | Enhanced wear resistance |
WC6 Gate Valve vs WCB Gate Valve
| Feature | WC6 | WCB |
|---|---|---|
| Temperature Capability | Higher | |
| Creep Resistance | Excellent | |
| Steam Service | Excellent | |
| Thermal Fatigue Resistance | Superior | |
| Material Cost | Higher | |
| Typical Application | Power Plants |
For temperatures above approximately 425°C, WC6 is generally preferred over WCB.
Inspection and Testing
Each valve undergoes:
Hydrostatic Shell Test
Verifies pressure integrity.
High-Pressure Seat Test
Ensures sealing performance.
PMI Testing
Confirms alloy composition.
Dimensional Inspection
Ensures compliance with standards.
NDE Examination
Optional:
- Radiographic Testing (RT)
- Ultrasonic Testing (UT)
- Magnetic Particle Testing (MT)
- Dye Penetrant Testing (PT)
Frequently Asked Questions
Why is WC6 used for steam applications?
WC6 contains chromium and molybdenum, providing excellent strength and creep resistance at elevated temperatures.
What is the advantage of a butt weld end?
BW connections eliminate flange leakage risks and provide stronger, permanent pipeline joints.
Can this valve be automated?
Yes. Electric, pneumatic, and hydraulic actuators can be supplied.
Is the valve suitable for superheated steam?
Yes. WC6 gate valves are commonly used in superheated steam systems within design limits.
What industries commonly use Class 900 WC6 gate valves?
Power generation, petrochemical processing, refineries, fertilizer plants, and industrial steam facilities.
Request a Quote
China WC6 Class 900 Gate Valve Manufacturer
We provide:
✅ API 600 Certified Manufacturing
✅ Alloy Steel Valve Expertise
✅ NACE MR0175 Available
✅ Third-Party Inspection Support
✅ Fast Production Lead Times
✅ Worldwide Export Experience
Please provide:
- Valve Size (14 Inch / DN350)
- Pressure Rating (Class 900)
- Betriebstemperatur
- Media Type
- Quantity Required
- Special Testing Requirements
Our engineering team will provide a detailed quotation, technical datasheet, GA drawing, and delivery schedule within 24 hours.
