12″-150LB-Wafer Knife Gate Valve

12″-150LB Wafer Knife Gate Valve – Technical Data Sheet

1. General Description

Product Name: Wafer Type Knife Gate Valve

Model: 12″-150LB

Nominal Diameter: 12 inches (NPS 12, DN 300)

Classe de pression : Class 150 (ANSI 150LB)

Connection Type: Wafer type

Product Introduction:

The knife gate valve is a shut‑off valve specifically designed for slurries, granular materials and fibrous media. Its key closure member is a gate with a sharp knife edge. When fully open, the gate is completely lifted above the valve body, allowing the medium to pass straight through with a smooth, unobstructed flow path, minimizing sediment accumulation. During closing, the sharp lower edge of the gate easily cuts through solid particles and fibrous debris in the flow channel, ensuring a tight shut‑off. The 12″-150LB wafer knife gate valve is suitable for low to medium pressure applications and is widely used in mining, metallurgy, papermaking, chemical industry, power generation, wastewater treatment and food processing.

2. Normes de conception

MSS SP‑81 applies to bonnetless, metal‑seated knife gate valves from NPS 2 to NPS 36 and specifies pressure limits and material requirements. For sizes 2″ to 24″, the maximum working pressure is 150 psi.

3. Main Technical Parameters

*Note: Face‑to‑face dimensions may vary slightly. For 12″ size, typical dimension is 8″ (203 mm). Full open height approx. 45″ (1143 mm), handwheel diameter approx. 18″ (457 mm).

4. Dimensional Data (Reference for 12″ Class 150 Wafer Knife Gate Valve)

Note: Flange dimensions strictly conform to ASME B16.5 Class 150.

5. Main Component Materials

Material Notes:

• Body material: MSS SP‑81 requires ASTM A216 WCB cast steel for corrosion resistance and pressure integrity.
• Seat material: Resilient seats (EPDM, NBR, polyurethane) are suitable for slurry media and provide bubble‑tight shut‑off; metal seats are for high temperature or dry media with better wear resistance.
• Gate material: Stainless steel gate is polished on both sides to prevent clogging and protect the seat.

6. Structural Features & Advantages

7. Performance Data

Classe de fuite :

• Resilient seats (EPDM/NBR/PU): Bubble‑tight shut‑off (zero leakage)
• Metal hard seat: ANSI/FCI 70‑2 Class III or Class IV

MSS SP‑81 requires a hydrostatic test at 1.5 times the rated working pressure to verify pressure‑containing integrity and sealing performance.

8. Applications & Industries

9. Options d'actionnement

10. Installation & Maintenance Instructions

1. Installation direction: For uni‑directional valves, follow the flow arrow on the body. Bi‑directional valves have no orientation restriction.
2. Flange alignment: Ensure the pipe flanges are precisely aligned to avoid uneven loading and leakage.
3. Bolting: Use long bolts passing through the valve body and both pipe flanges. Tighten diagonally and evenly.
4. Packing maintenance: If packing leaks, tighten the packing gland bolts. Replace packing if worn out.
5. Seat maintenance: Clean the sealing area or replace the seat if damaged or contaminated.
6. Not for throttling: Knife gate valves are designed for fully open or fully closed service only – not for flow regulation.
7. Regular lubrication: Lubricate the actuation mechanism and stem periodically to ensure smooth operation.

11. Quality Assurance & Inspection

All tests are performed in accordance with MSS SP‑81 and API 598.

GARANTIE :

SAVVY VALVES s'engage à fournir des produits d'une qualité exceptionnelle et un service après-vente sans souci. Nos vannes sont garanties pour une durée de vie minimale de 12 mois, période durant laquelle nous fournissons gratuitement toutes les pièces de rechange nécessaires et des instructions d'entretien détaillées. Pendant la période de garantie, en cas de dommage non causé par l'homme, nous remplaçons gratuitement les composants et fournissons une assistance technique professionnelle. Après l'expiration de la garantie, seuls les pièces de rechange sont à votre charge, tout en bénéficiant de services de maintenance à prix réduits. Notre objectif est d'aider nos clients à réduire leurs coûts d'exploitation et à optimiser leur production grâce à une qualité fiable et un service après-vente complet. Qu'il s'agisse de questions techniques ou de besoins de maintenance, notre équipe d'experts répondra rapidement pour garantir le fonctionnement optimal de votre système de vannes.