Description
TECHNICAL DATA SHEET
Lugged Knife Gate Valve (Stainless Steel, PTFE Seat, Class 150)
|
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) |
|
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.
|
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. |
|
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. |
*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:
|
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 |
|
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 |
|
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 |
Procurement Notes
*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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