Knife Gate Valve 103 – bi-directional, one-piece body
Technical Specifications
Nominal diameter DN 50-1000- Nominal pressure PN 10, PN16
- Medium temperature -20 °C ... +130 °C
- Types of Valve End Connections Wafer, lug
- Leakage Class «А»
- Mounting Position Any, except for the actuator facing downward
- Types of Control — manual (lever) — manual (handwheel)— manual (gearbox)— pneumatic actuation — electric actuation
- Warranty Period 12 months
- Average Service Life 2500 cycles
- Guaranteed Service Life Not less than 1000 cycles
Technical Drawings and Dimensions
Basic Dimensions Table
| DN | D, mm | D1, mm | D2, mm | L, mm | n-ød |
|---|---|---|---|---|---|
| 50 | 165 | 125 | 102 | 48 | 4-M16 |
| 65 | 185 | 145 | 122 | 48 | 4-M16 / 8-M16 |
| 80 | 200 | 160 | 138 | 51 | 8-M16 |
| 100 | 220 | 180 | 158 | 51 | 8-M16 |
| 125 | 250 | 210 | 188 | 57 | 8-M16 |
| 150 | 285 | 240 | 212 | 57 | 8-M20 |
| 200 | 340 | 295 | 268 | 70 | 8-M20 |
| 250 | 395 | 350 | 320 | 70 | 12-M20 |
| 300 | 445 | 400 | 370 | 76 | 12-M20 |
| 350 | 505 | 460 | 430 | 76 | 16-M20 |
| 400 | 565 | 515 | 482 | 89 | 16-M24 |
| 450 | 615 | 565 | 532 | 89 | 20-M24 |
| 500 | 670 | 620 | 585 | 114 | 20-M24 |
| 600 | 780 | 725 | 685 | 114 | 20-M27 |
Tabular values for diameters DN700–DN1400 and for pressure PN16 are available upon request
Product Description
Knife gate valve model 103 is a bidirectional shut-off valve with a one-piece cast body and a U-shaped elastomeric seat. It is intended primarily for water and other non-aggressive liquids containing limited amounts of suspended solids.
The seat seals against the gate from either flow direction. When the gate opens, the flexible seat follows the internal body contour, helping maintain an open flow path and reduce the accumulation of fine solids in the gate channel.
Available configurations
- Size range: DN 50–1000;
- Connections: wafer or lug, with PN10 or PN16 flange drilling;
- Sealing: bidirectional U-shaped seat;
- Operation: handwheel, gearbox, pneumatic or electric actuator;
- Stem: rising or non-rising, depending on the configuration;
- Temperature range: −20°C to +130°C for the catalogued configuration, subject to the medium and operating conditions.
Design features
- One-piece cast body;
- U-shaped elastomeric seat for sealing in both flow directions;
- Full-bore flow path when the valve is open;
- Optional gate scraper for media that may adhere to the gate.
Process media
Water and non-aggressive liquids with limited suspended solids. The catalogue describes liquid service with up to 5% suspended solids. Suitability for steam, chemicals, petroleum products or dry bulk material requires assessment of the medium, seat compound, temperature and operating conditions.
Component materials
| Component | Material | EN designation |
|---|---|---|
| Body | Ductile iron GGG40 | EN-GJS-400-15 |
| Gate | AISI 304 / 316L / 316Ti | 1.4301 / 1.4404 / 1.4571 |
| Seat | EPDM | U-shaped elastomeric seat |
Alternative component materials or seat compounds require a separately specified and documented configuration.
Maximum shut-off differential pressure
| Nominal size | Maximum ΔP |
|---|---|
| DN 50–250 | 10 bar |
| DN 300–400 | 6 bar |
| DN 450 | 5 bar |
| DN 500–600 | 4 bar |
| Larger sizes | Confirmed for the ordered configuration |
Higher pressure ratings can be evaluated for custom-designed versions on request.
Sealing
The catalogued EPDM-seat configuration is specified for leakage Class A according to ISO 5208, with testing according to EN 12266-1.
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