英语
德语
阿拉伯语
Technical Features and Specifications
The reliability of a check valve depends on the integrity of its forged components and the precision of its seating surfaces.
| Component | Material/Technical Requirement |
|---|---|
| Body Material | A105, F316L, F11, F22, F51 (Duplex) |
| Design Standard | API 602, ASME B16.34, BS 5352 |
| Seating Surface | Integral or Stellite-faced for wear resistance |
| End Connections | Socket Weld (SW), Threaded (NPT), or Flanged |
Forged check valves are often designed with a "bolted cover" or "welded cover" to allow for internal inspection and maintenance. The seat ring is often forged separately and then pressed or threaded into the forged body, ensuring that the highest wear area is made from the most durable material. Every forged check valve component is hydrostatically tested to ensure zero leakage in the backflow direction.
-
Development Conceptscientific and technological innovation as the driving force. -
Quality PolicyPeople, integrity, truth-seeking, innovation -
Core ValueCommon development to achieve symbiosis and win-win.
Procurement Tips for Check Valve Forgings
When procuring forged check valves, it is important to focus on the specific dynamics of your piping system:
- Cracking Pressure: For piston-style forged check valves, verify the spring tension to ensure the valve opens at the correct differential pressure.
- Orientation: Forged swing check valves are generally limited to horizontal or vertical-up flow; ensure the forged body design matches your installation plan.
- Media Velocity: If the flow velocity is very high, specify a forged body with a streamlined flow path to minimize pressure drop and erosion.
- NACE Compliance: For oilfield applications, ensure the forging and its internal parts meet NACE MR0175 for sour gas service.
Check for a "Full Bore" design if pigging the pipeline is required, as many forged check valves are "Reduced Bore" by default to save weight and cost.
Advantages of Forged Check Valves
The primary advantage of forged check valves is their ability to survive in "severe service" environments where other valves would fail.
| Advantage | Benefit for the User |
|---|---|
| Impact Resistance | Handles the shock of sudden closure (water hammer) safely. |
| Compact Design | Ideal for skid-mounted systems and tight piping layouts. |
| Longevity | Forged seats last significantly longer than cast seats. |
| Leak Prevention | Dense forged body prevents "sweating" or weeping under pressure. |
Because forged check valves have a very uniform wall thickness, they are much more resistant to thermal fatigue. This makes them the preferred choice for high-pressure steam traps and drain lines in power plants where temperatures can fluctuate rapidly. The high-quality surface finish of forged internals also reduces the chance of debris getting caught in the valve, ensuring it always closes fully.
Critical Application Environments
Forged check valves are found in any system where backflow protection is a safety-critical requirement.
| Sector | Role of Check Valve |
|---|---|
| Oil Refining | Preventing backflow of hydrocarbons into pumps. |
| High-Pressure Steam | Protecting boilers from cold water back-feed. |
| Desalination | Corrosion-resistant backflow prevention in brine lines. |
| Chemical Injection | Ensuring precise, one-way delivery of chemicals. |
In the pharmaceutical and food industries, forged stainless steel check valves are used because their non-porous surfaces prevent bacterial growth and allow for effective Clean-In-Place (CIP) procedures. Their versatility and reliability across such a broad range of temperatures and pressures make them an essential component in modern fluid engineering.
- Q: Can forged check valves be used in vertical pipes?
- A: Yes, but typically only for "flow-up" orientations. Forged piston check valves are often preferred for vertical lines if they are spring-loaded.
- Q: What causes a check valve to "chatter"?
- A: Chatter occurs when the flow rate is too low to keep the disc fully open, causing it to bounce. Choosing a forged valve with a correctly sized port can help eliminate this.
