12″-150LB-Wafer Knife Gate Valve

Nominal Pipe Size (NPS) 12″ (DN 300)
Pressure Class Class 150 (150 LB)
Maximum Working Pressure 150 psi (10.3 bar)
Face to Face Dimension L 8″ (approx. 203 mm)*
Flange Standard ASME B16.5 Class 150
Flange Facing RF (Raised Face) / FF (Flat Face)
Connection Type Wafer type

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

General Description

Product Name: Wafer Type Knife Gate Valve

Model: 12″-150LB

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

圧力クラス: 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.

設計基準

Item	標準
Design & Manufacture	MSS SP‑81, JB/T 8691
Face‑to‑Face (Structure Length)	MSS SP‑81, TAPPI TIS 405.8, GB/T 15188.2
Flange Connection Dimensions	ANSI B16.5 Class 150
Inspection & Testing	MSS SP‑81, API 598, GB/T 13927
Pressure‑Temperature Rating	ASME B16.34

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.

Main Technical Parameters

パラメータ	Value
Nominal Pipe Size (NPS)	12″ (DN 300)
Pressure Class	Class 150 (150 LB)
Maximum Working Pressure	150 psi (10.3 bar)
Face‑to‑Face Dimension L	8″ (approx. 203 mm)*
Flange Standard	ASME B16.5 Class 150
Flange Facing	RF (Raised Face) / FF (Flat Face)
Connection Type	Wafer type
アクチュエーション	Handwheel (manual) / Pneumatic / Electric / Electro‑hydraulic
Temperature Range	-29°C to +425°C (depending on seat material)
Suitable Media	Pulp, sewage, coal slurry, ash, gypsum slurry, powder, etc.
バルブタイプ	Bonnetless, rising stem

*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).

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

NPS	Face‑to‑Face L (mm)	Flange OD D (mm)	Bolt Circle D1 (mm)	No. of Bolt Holes	Bolt Hole Dia. (mm)
12″	approx. 203	approx. 505	approx. 470	12	approx. 25

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

Main Component Materials

Component	Available Materials
体	Carbon steel WCB, CF8 (304 SS), CF8M (316 SS), Ductile iron, Duplex stainless steel
Gate	304 SS, 316 SS, 2205 Duplex SS, 17‑4 PH SS
幹	304 SS, 316 SS, 17‑4 PH SS
シート	EPDM (-50°C ~ +150°C), NBR (-40°C ~ +100°C), PTFE, Polyurethane (PU), Metal hard‑seat
Packing Gland	304 SS, 316 SS, Ductile iron
Packing	PTFE, Graphite, Lubricated packing
Fasteners	Stainless steel A4‑70 / A2‑70

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.

Structural Features & Advantages

No.	Feature	Description
1	Wafer design	Compact, lightweight, space‑saving – the valve body has no integral flanges and is clamped between pipeline flanges.
2	Bonnetless design	The gate lifts completely above the body, preventing media accumulation and clogging.
3	Sharp knife edge	The gate bottom has a blade that cuts through solids and fibers during closing, ensuring reliable shut‑off.
4	U‑cup seal	Newly developed U‑cup seal design provides excellent sealing performance.
5	Replaceable seat	Resilient seats can be easily replaced on‑site, reducing maintenance cost.
6	Bidirectional sealing	Optional bidirectional sealing design meets different pressure requirements.
7	Body guide	Guides in the body ensure accurate and stable gate movement.
8	Self‑adjusting packing	Self‑adjusting packing gland provides effective stem sealing while also cleaning the gate.

Performance Data

Test	Test Pressure	Acceptance Criteria
Shell (Strength) Test	1.5 × rated pressure (225 psi)	No visible leakage per MSS SP‑81 / API 598
High‑Pressure Seat Test	1.1 × rated pressure (165 psi)	No visible leakage per MSS SP‑81 / API 598
Low‑Pressure Seat Test	As per standard	API 598
Stem Seal Test	As per standard	No visible leakage

漏洩クラス:

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.

Applications & Industries

Industry	Typical Media	Remarks
Mining / Metallurgy	Ore slurry, tailings, coal slurry, ash	Knife edge cuts solid particles; wear‑resistant
Paper & Pulp	Pulp, white water, black liquor	Gate easily cuts fibrous pulp without wrapping
Wastewater Treatment	Raw sewage, sludge, sand	Handles fibrous and solid‑laden wastewater
Power Generation	Fly ash, bottom ash, limestone slurry (FGD systems)	Wear‑resistant, suitable for FGD slurry
Chemical Industry	Corrosive slurries, powders	Option of stainless steel, duplex or special alloys
Food Industry	Food slurries, syrups	Hygienic design, easy to clean

Actuation Options

アクチュエーション	Description	Typical Application
Manual (Handwheel)	Rising stem handwheel, low torque, easy operation	General service, no automation
Manual (Chainwheel)	Chain operation for high or hard‑to‑reach locations	Overhead installations
Pneumatic Actuator	Double‑acting or spring‑return, fast stroke	Automated lines, explosion‑proof areas
Electric Actuator	Remote control capability	Centralized control, intelligent systems
Electro‑hydraulic Actuator	Smooth operation, low impact	High‑pressure service, precise positioning

Installation & Maintenance Instructions

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

Quality Assurance & Inspection

Inspection Item	Details
Shell (Strength) Test	100% at 1.5× rated pressure, no visible leakage
Seat Leakage Test	100% at 1.1× rated pressure, leakage meets standard requirements
Material Verification	Material certificate provided (EN 10204 3.1 or 3.2)
Visual Inspection	100% – no defects, uniform coating
Dimensional Check	100% inspection per drawing
Functional Test	Smooth opening/closing, no sticking or binding

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

保証:

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