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)

Drukklasse: 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. Ontwerpnormen

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

Lekkageklasse:

• 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. Aandrijfopties

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:

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