Pneumatic Knife Gate Valve
Categories: Knife Gate Valves, Pneumatic Actuated Knife Gate Valve
Description
TECHNICAL DATA SHEET
Pneumatic Operated Lugged Knife Gate Valve (Stainless Steel, PTFE Seat, Class 150)
Project: _______________________
Tag No.: _______________________
PO No.: _______________________
1. General Information
| Item | Specification |
|---|---|
| Valve Type | Knife Gate Valve, Lugged Body, Rising Stem, Pneumatic Operated |
| Size Range | DN50 – DN600 (2″ to 24″) [Specify size: _____] |
| Pressure Rating | Class 150 (PN10/PN16 compatible) |
| End Connection | Lugged Type (Tapped bolt holes per ASME B16.5 Class 150 drilling) |
| Operation | Pneumatic Actuator (Double-Acting / Spring-Return) |
| Design Standard | MSS SP-81 / API 609 (Category A) |
| Face to Face Standard | MSS SP-81 (Short pattern) |
| 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) |
2. Valve Assembly Specifications
2.1 Valve Body & Trim
| 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, with ISO 5211 mounting flange |
| 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 |
| Name Plate | 1 | Stainless Steel | MSS SP-25 marking |
2.2 Valve Design Features
-
Lugged body with tapped bolt holes for dead-end service
-
Bidirectional PTFE seat for bubble-tight shut-off
-
Full port design minimizes pressure drop
-
Self-cleaning gate cuts through solids
-
Anti-blowout stem for safety
-
Replaceable seat without removing valve from line
-
ISO 5211 top flange for direct actuator mounting
3. Pneumatic Actuator Specifications
3.1 General Actuator Data
| Item | Specification |
|---|---|
| Actuator Type | Rack & Pinion / Scotch Yoke Pneumatic Actuator (Select based on torque) |
| Action | ☐ Double-Acting ☐ Spring-Return (Fail-Open / Fail-Closed) |
| Control Signal | On-Off (with solenoid valve) or Modulating (with positioner) |
| Supply Pressure | 4 – 8 bar (60 – 120 psi) |
| Operating Temperature | -20°C to +80°C (-4°F to +176°F) |
| Housing Material | Aluminum Alloy (Epoxy coated) / Stainless Steel (optional) |
| Mounting | Direct mounting to valve yoke per ISO 5211 |
| Drive Type | Female drive (square or double square) |
| NAMUR Interface | For solenoid valve and accessories |
| Manual Override | Optional (handwheel or hex wrench) |
| Protection Class | IP65 / IP67 (weatherproof) |
| Explosion-Proof | Available (Ex d IIB T4 / Ex mb) |
3.2 Accessories (Select as required)
| Accessory | Function |
|---|---|
| Solenoid Valve | Pilot control (NAMUR mount, 24V DC / 110V AC / 230V AC) |
| Limit Switch Box | Position indication (mechanical or proximity switches) |
| Positioner | Modulating control (4-20mA input) |
| Air Filter Regulator | Compressed air preparation with pressure gauge |
| Quick Exhaust Valve | For faster stroking speed |
| Lock-Up Valve | Lock last position on air failure |
| Manual Override | Handwheel or hex key for manual operation |
3.3 Actuator Sizing & Torque Data
*Note: Required torque depends on valve size, pressure, and media. The actuator is sized with a safety factor of 1.3 – 1.5.*
| Valve Size (NPS) | Break Torque @ 5 bar (Nm) | Recommended Actuator Size (Double-Acting) |
|---|---|---|
| 2″ | 50 | DA-080 / DA-090 |
| 3″ | 90 | DA-100 / DA-115 |
| 4″ | 150 | DA-125 / DA-140 |
| 6″ | 300 | DA-160 / DA-180 |
| 8″ | 550 | DA-200 / Scotch Yoke |
| 10″ | 900 | Scotch Yoke |
| 12″ | 1400 | Scotch Yoke |
| 14″ | 2000 | Scotch Yoke |
| 16″ | 2800 | Scotch Yoke |
| 18″ | 3700 | Scotch Yoke |
| 20″ | 4800 | Scotch Yoke |
| 24″ | 6500 | Scotch Yoke |
For spring-return actuators, torque values are higher (spring torque + air torque). Consult factory for exact sizing.
4. Dimensional Data
*Note: Face-to-face per MSS SP-81. Overall height with actuator is approximate; confirm with actuator data sheet.*
| Size (NPS) | L (mm) | H Valve (mm) | H with Actuator (mm) | Bolt Circle (mm) | No. Holes | Tapped Hole Depth (mm) |
|---|---|---|---|---|---|---|
| 2″ | 48 | 350 | 550 | 120.7 | 4 | 18 |
| 3″ | 51 | 420 | 640 | 152.4 | 4 | 18 |
| 4″ | 57 | 500 | 740 | 190.5 | 8 | 20 |
| 6″ | 70 | 650 | 940 | 241.3 | 8 | 22 |
| 8″ | 76 | 800 | 1120 | 298.5 | 8 | 22 |
| 10″ | 89 | 950 | 1300 | 362.0 | 12 | 24 |
| 12″ | 102 | 1150 | 1550 | 431.8 | 12 | 24 |
| 14″ | 114 | 1350 | 1800 | 476.3 | 12 | 25 |
| 16″ | 127 | 1550 | 2050 | 539.8 | 16 | 25 |
| 18″ | 140 | 1750 | 2300 | 577.9 | 16 | 28 |
| 20″ | 152 | 1950 | 2550 | 635.0 | 20 | 28 |
| 24″ | 178 | 2350 | 3050 | 749.3 | 20 | 32 |
5. Performance & Testing
| Test | Medium | Pressure | Acceptance Criteria |
|---|---|---|---|
| Shell Test | Water | 3.0 MPa (435 psi) | No visible leakage |
| Seat Test (High Pressure) | Water | 2.2 MPa (319 psi) | No visible leakage |
| Seat Test (Low Pressure) | Air | 0.6 MPa (87 psi) | Bubble-tight |
| Actuator Functional Test | Air | Rated supply pressure | Full stroke, no binding |
6. Ordering Information
Please specify the following when ordering:
| Parameter | Options |
|---|---|
| Valve Size | 2″ – 24″ |
| Body Material | CF8M (316SS) / CF3M (316L) |
| Seat Material | PTFE (standard) / Reinforced PTFE / Metal |
| Actuator Action | Double-Acting / Spring-Return (Fail-Open / Fail-Closed) |
| Supply Pressure | ___ bar |
| Control Type | On-Off (with solenoid) / Modulating (4-20mA) |
| Solenoid Voltage | 24V DC / 110V AC / 230V AC |
| Accessories | Limit Switch Box / Positioner / Air Filter Regulator |
| Special Requirements | Oxygen cleaning, NACE, etc. |
*This technical data sheet complies with MSS SP-81 and ASME B16.34 for knife gate valves with pneumatic actuation.*
Manufacturer: _______________________
Date: _______________________
Prepared by: _______________________
