316L Fully Lugged Knife Gate Valve

Valve Type Knife Gate Valve, Lugged Body, Rising Stem / Non-Rising Stem (Specify)
Size Range DN50 – DN600 (2″ to 24″)
Pressure Rating Class 150 (PN10/PN16 compatible)
End Connection Lugged Type (Tapped bolt holes per ASME B16.5 Class 150 drilling)
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
Service Slurries, Pulp & Paper, Wastewater, Chemical, Mining, Corrosive Fluids
Temperature Range -20°C to +180°C (-4°F to +356°F) (PTFE seat limitation)

Description

TECHNICAL DATA SHEET

Lugged Knife Gate Valve (Stainless Steel, PTFE Seat, Class 150)

General Information

Item	Specification
Valve Type	Knife Gate Valve, Lugged Body, Rising Stem / Non-Rising Stem (Specify)
Size Range	DN50 – DN600 (2″ to 24″)
Pressure Rating	Class 150 (PN10/PN16 compatible)
End Connection	Lugged Type (Tapped bolt holes per ASME B16.5 Class 150 drilling)
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
Service	Slurries, Pulp & Paper, Wastewater, Chemical, Mining, Corrosive Fluids
Temperature Range	-20°C to +180°C (-4°F to +356°F) (PTFE seat limitation)

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: Seat can be fully vulcanized or mechanically retained; packing live-loading available.

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, rolled threads for strength.

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沉积物 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.

Dimensional Data (Reference)

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

Size (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	70	650	350	241.3	8	22
8″	200	76	800	400	298.5	8	22
10″	250	89	950	450	362.0	12	24
12″	300	102	1150	500	431.8	12	24
14″	350	114	1350	560	476.3	12	25
16″	400	127	1550	620	539.8	16	25
18″	450	140	1750	680	577.9	16	28
20″	500	152	1950	740	635.0	20	28
24″	600	178	2350	860	749.3	20	32

Notes:

L dimension is per MSS SP-81 (wafer short pattern). Lugged bodies may have slightly longer face-to-face; confirm with manufacturer.
Flange drilling per ASME B16.5 Class 150.
Tapped holes are typically UNC or metric threads; specify when ordering.

Performance & Testing (Per API 598 / MSS SP-81)

Test	Medium	Pressure	Acceptance Criteria
Shell (Body) Test	Water	1.5 x Rated Pressure (3.0 MPa / 435 psi)	No visible leakage
Seat (Seal) Test	Water	1.1 x Rated Pressure (2.2 MPa / 319 psi)	No visible leakage (Class VI optional)
Low Pressure Seat Test	Air / Nitrogen	0.6 MPa (87 psi)	Bubble-tight
Backseat Test	Water / Air	Rated Pressure	No leakage through packing when fully open

Actuation Options

Operator Type	Availability	Notes
Handwheel	Standard (≤12″)	Rising stem or non-rising stem
Bevel Gear	Optional (≥14″)	For easier operation on larger sizes
Pneumatic Actuator	Optional	Double-acting or spring-return
Electric Actuator	Optional	On-off or modulating
Hydraulic Actuator	Optional	For high thrust requirements

Applications

Pulp & Paper: Stock preparation, bleach plants, pulp mills
Mining: Tailings, slurries, thickener underflow
Wastewater: Raw sewage, sludge, grit channels
Chemical: Corrosive liquids, acids, caustics
Food & Beverage: Hygienic processing (with appropriate finish)
Power: Fly ash, limestone slurry

Special Options

Option	Description
Metal Seat	For high temperature or abrasive services (replace PTFE with metal seat)
V-Seat / Shearing Gate	Modified gate for cutting fibrous materials
Live-Loaded Packing	Belleville springs maintain packing compression
Flush Ports	For purging or cleaning body cavity
Extended Stem	For buried or insulated service
Oxygen Cleaning	Degreased per CGA G-4.1 for oxygen service

Marking & Documentation

Marking: Per MSS SP-25 (Size, Pressure Class, Material, Manufacturer’s Logo, Heat No.)
Standard Documentation:

Material Test Certificates (EN 10204 3.1)
Pressure Test Report
Certified Dimensional Drawing
Operation & Maintenance Manual

Optional Documentation:

PMI Test Report
NACE MR0175 Compliance
NDT Reports (RT, PT, MT)

Procurement Notes

Size & Pressure Class: Confirm NPS and Class (150LB standard).
Body Material: CF8M (316SS) is standard; CF3M (316L) for welding applications.
Seat Material: Virgin PTFE is standard; specify if reinforced PTFE or conductive PTFE required.
Operator Type: Handwheel, gear, or actuated.
Face-to-Face: Confirm if MSS SP-81 short pattern is acceptable.
Tapped Holes: Specify thread type (UNC or metric) if lugged connection.

*This technical data sheet complies with MSS SP-81 and ASME B16.34 requirements for knife gate valves.*

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.

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