150LB-Lugged 316SS Knife Gate Valve
150LB-Lugged 316SS Knife Gate Valve - Image 2
150LB-Lugged 316SS Knife Gate Valve - Image 3
150LB-Lugged 316SS Knife Gate Valve - Image 4

150LB-Lugged 316SS Knife Gate Valve

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Description

150LB-Lugged 316SS Knife Gate Valve – Technical Data Sheet

1. General Information

Item Specification
Valve Type Knife Gate Valve, Lugged Body, Rising Stem / Non-Rising Stem (Specify)
Size Range DN50 – DN600 (2″ to 24″) [Specify size: _____]
Pressure Rating Class 150 (PN10/PN16 compatible)
Maximum Working Pressure 150 psi (10.3 bar) for sizes 2″ to 24″; larger sizes may have reduced rating
End Connection Lugged Type – Tapped bolt holes per ASME B16.5 Class 150 drilling
Body Material 316 Stainless Steel (ASTM A351 Grade CF8M or CF3M)
Gate Material 316 Stainless Steel (ASTM A240 Type 316/316L), ground finish, beveled edge
Seat Material PTFE (Virgin PTFE or Reinforced PTFE with glass/carbon fill)
Design Standard MSS SP-81 / API 609 (Category A)
Face-to-Face Standard MSS SP-81 (Short pattern) / Manufacturer‘s standard
Test Standard API 598 / MSS SP-81
Temperature Range -20°C to +180°C (-4°F to +356°F) (PTFE seat limitation)
Applicable Service Slurries, Pulp & Paper, Wastewater, Chemical, Mining, Corrosive Fluids

2. Bill of Materials (Materials of Construction)

Part Name Qty. Material Material Specification / Notes
Body 1 Stainless Steel ASTM A351 Grade CF8M (316) or CF3M (316L)
Gate (Blade) 1 Stainless Steel ASTM A240 Type 316/316L, ground finish, beveled edge
Seat 1 PTFE Virgin PTFE or Reinforced PTFE (glass/carbon filled)
Stem 1 Stainless Steel ASTM A276 Type 316, anti-blowout design
Packing Set PTFE / Graphite Chevron / V-ring type, adjustable
Gland Follower 1 Stainless Steel ASTM A351 CF8M
Yoke 1 Stainless Steel / Ductile Iron Cast or fabricated
Bonnet / Cover 1 Stainless Steel Optional, for pressure-containing designs
Bonnet Bolts Set Stainless Steel ASTM A193 Grade B8
Bonnet Nuts Set Stainless Steel ASTM A194 Grade 8
Handwheel / Operator 1 Cast Iron / Steel With stainless steel stem nut
Name Plate 1 Stainless Steel MSS SP-25 marking

Optional Features:

  • Seat can be fully vulcanized or mechanically retained

  • Packing live-loading available

3. Material Specifications & Rationale

Component Material Rationale
Body CF8M (316 SS) Excellent corrosion resistance in acidic, chloride, and industrial environments. Suitable for food, chemical, and marine applications.
Gate 316 SS Ground finish reduces friction against PTFE seat; beveled edge cuts through slurry solids.
Seat PTFE Chemically inert, low friction, provides bubble-tight shut-off even with entrained solids. Resilient and self-cleaning.
Stem 316 SS Anti-blowout shoulder design; rolled threads for strength.

4. Design Features

Feature Description
Lugged Body Tapped bolt holes allow dead-end service or installation without nuts on one side; suitable for end-of-line or isolation applications.
Bidirectional Shut-Off PTFE seat provides tight sealing in both directions.
Full Port Unobstructed flow when fully open, minimizes pressure drop.
Self-Cleaning Gate cuts through sediment during closure; seat design prevents solids buildup.
Anti-Blowout Stem Stem retained by internal shoulder, cannot be ejected under pressure.
Replaceable Seat Seat can be replaced without removing valve from line (in most designs).
Flange Drilling Drilled per ASME B16.5 Class 150, compatible with PN10/PN16 flanges.

5. Dimensional Data (Reference)

*Note: Face-to-face dimensions per MSS SP-81 (short pattern). Actual dimensions may vary by manufacturer.*

NPS DN (mm) Face-to-Face L (mm) Height H (Open) (mm) Handwheel Dia. (mm) Bolt Circle Dia. (mm) No. of Holes Tapped Hole Depth (mm)
2″ 50 48 350 200 120.7 4 18
3″ 80 51 420 250 152.4 4 18
4″ 100 57 500 280 190.5 8 20
6″ 150 64 620 330 241.3 8 22
8″ 200 71 760 356 298.5 8 22
10″ 250 86 900 406 362.0 12 25
12″ 300 102 1060 457 431.8 12 25
14″ 350 127 1210 508 476.3 12 25
16″ 400 152 1360 610 539.8 16 28
18″ 450 178 1520 660 577.9 16 28
20″ 500 203 1680 710 635.0 20 28
24″ 600 254 1980 810 749.3 20 32

6. Performance Data (Per API 598 / MSS SP-81)

Test Type Test Pressure Medium Acceptance Criteria
Shell (Hydrostatic) Strength Test 1.5 × rated pressure (225 psi) Water No visible leakage
High-Pressure Seat Test 1.1 × rated pressure (165 psi) Water No visible leakage
Low-Pressure Seat Test 80-90 psi (5-6 bar) Air or Nitrogen Bubble-tight per API 598

Leakage Class:

  • PTFE seat: Bubble-tight shut-off (zero leakage)

7. Applications & Industries

Industry Typical Media Remarks
Chemical Industry Corrosive fluids, acids, chemical slurries 316 SS body provides excellent corrosion resistance
Pulp & Paper Pulp stock, black liquor, white water, paper slurry Knife edge cuts through fibrous materials
Wastewater Treatment Raw sewage, sludge, effluent Handles fibrous and solid-laden wastewater
Mining / Metallurgy Ore slurry, tailings, mineral concentrates Wear-resistant, suitable for abrasive slurries
Food Industry Food slurries, syrups, sauces 316 SS provides sanitary, corrosion-resistant service
Marine Applications Seawater, brackish water 316 SS resists chloride-induced corrosion

8. Actuation Options

Actuation Description Typical Application
Manual (Handwheel) Rising stem handwheel, low torque, easy operation; clockwise to close, counter-clockwise to open General service, no automation
Manual (Bevel Gear) Gear-operated for larger sizes or higher torque requirements 8″ and larger sizes, hard-to-operate applications
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

9. Installation & Maintenance Instructions

  1. Installation direction: For uni-directional valves, follow the flow arrow on the body. Bi-directional PTFE seat valves have no orientation restriction.

  2. Lugged connection: Bolts pass through flange holes and thread directly into the body lugs. Do not use nuts on the opposite side (unless specified).

  3. Dead-end service: Lugged design is suitable for end-of-line or isolation applications, allowing removal of downstream piping without depressurizing the system.

  4. Flange alignment: Ensure the pipe flanges are precisely aligned to avoid uneven loading and leakage.

  5. Bolting: Tighten bolts diagonally and evenly to the recommended torque values.

  6. Packing maintenance: If packing leaks, tighten the packing gland bolts. Replace packing if worn out.

  7. Seat maintenance: Clean the sealing area or replace the seat if damaged or contaminated.

  8. Not for throttling: Knife gate valves are designed for fully open or fully closed service only – not for flow regulation.

  9. Regular lubrication: Lubricate the actuation mechanism and stem periodically to ensure smooth operation.

10. Quality Assurance & Inspection

Inspection Item Details
Shell (Strength) Test 100% at 1.5× rated pressure, no visible leakage per API 598 / MSS SP-81
Seat Leakage Test 100% at 1.1× rated pressure, leakage meets API 598 requirements
Low-Pressure Seat Test 100% with air or nitrogen, bubble-tight
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
Marking Verification Per MSS SP-25

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

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