Knife Gate Valve 106 – dual elastomer seat rings
Technical Specifications
Nominal diameter DN 50-800- Nominal pressure PN10, PN16
- Medium temperature -20 °C ... +200 °C
- Types of Valve End Connections Wafer, lug
- Leakage Class «А»
- Mounting Position Any, except for downward-driven devices
- 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 | 99 | 53 | 4-M16 |
| 65 | 185 | 145 | 118 | 53 | 4-M16 / 8-M16 |
| 80 | 200 | 160 | 132 | 56 | 8-M16 |
| 100 | 220 | 180 | 156 | 56 | 8-M16 |
| 125 | 250 | 210 | 184 | 63 | 8-M16 |
| 150 | 285 | 240 | 211 | 62 | 8-M20 |
| 200 | 340 | 295 | 266 | 76 | 8-M20 |
| 250 | 395 | 350 | 319 | 75 | 12-M20 |
| 300 | 445 | 400 | 370 | 84 | 12-M20 |
| 350 | 505 | 460 | 429 | 84 | 16-M20 |
| 400 | 565 | 515 | 480 | 99 | 16-M24 |
| 450 | 615 | 565 | 530 | 99 | 20-M24 |
Tabular values for diameters DN500–DN800 and for pressure PN16 are available upon request
Product Description
Knife gate valve model 106 is a bidirectional isolation valve for slurries and other media containing abrasive solids. Its sealing system uses two replaceable elastomer seat rings positioned on opposite sides of the gate. Body material options include ductile iron, carbon steel, stainless steel and duplex stainless steel.
When the valve is fully open, the seat rings press against each other to form the flow passage, with the gate withdrawn from the flow path. During closing, the gate passes between the rings, which seal against both sides of the gate. Material displaced into the lower body cavity can be removed through the flushing channels in the removable bottom cover.
Available configurations
- Size range: DN 50–800;
- Connections: wafer or lug, with PN10 or PN16 flange drilling;
- Sealing: bidirectional, with two replaceable elastomer seat rings;
- Body: one-piece or dismantlable two-piece construction, depending on the configuration;
- Operation: handwheel, gearbox, pneumatic or electric actuator;
- Stem: rising or non-rising, depending on the configuration;
- Operating temperature: determined by the selected elastomer compound and operating conditions.
Design features
- Two replaceable elastomer seat rings for bidirectional shut-off;
- Full-bore flow passage with the gate fully withdrawn;
- Contact between the seat rings helps protect the body from the process flow in the fully open position;
- Gate movement helps remove material adhering to its surface;
- Removable bottom cover with flushing channels for cleaning the lower body cavity;
- Body, gate and seat materials selected for abrasion resistance and the operating conditions.
Process media
Mineral slurries, sand-laden water, sludge and other liquids containing abrasive particles. Oils, petroleum products and chemical media can be handled with a suitable elastomer compound and gate material. Material selection takes into account the medium composition, concentration, solids content, pressure and temperature.
Material options
| Component | Material | EN designation |
|---|---|---|
| Body | ||
| Ductile iron | GGG40 | EN-GJS-400-15 |
| Cast carbon steel | ASTM A216 WCB | GP240GH (1.0619) |
| Cast stainless steel | ASTM A351 CF8 / CF3 | 1.4308 / 1.4309 |
| Cast stainless steel | ASTM A351 CF8M / CF3M | 1.4408 / 1.4409 |
| Duplex / Super duplex | Cast grade selected for the configuration | According to specification |
| Gate | ||
| Stainless steel | AISI 304 / 316 / 316L / 316Ti | 1.4301 / 1.4401 / 1.4404 / 1.4571 |
| Seat rings | ||
| Elastomeric / polyurethane | NR / NBR / EPDM / FKM / PU | Selected for the medium |
Body, gate and seat ring materials are selected for the operating conditions. The material combination and operating limits are specified in the valve datasheet.
Seat ring material selection
| Material | Typical applications | Catalogue temperature range |
|---|---|---|
| NR | Abrasive water-based slurries, mineral suspensions and sand-laden water | −20°C to +90°C |
| NBR | Media containing mineral oils and compatible petroleum products | −20°C to +100°C |
| EPDM | Water-based media, salt solutions and compatible aqueous chemicals | −20°C to +130°C |
| FKM | Selected oils and chemical media requiring elevated-temperature resistance | −20°C to +200°C |
| PU | Selected abrasive duties requiring wear-resistant polyurethane | According to the specified compound |
Temperature limits depend on the compound, medium and operating conditions. The maximum temperature of +200°C applies to the specified FKM configuration and does not apply to every seat material.
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 |
| DN 700–800 | According to the selected configuration |
The values shown apply to the catalogued configuration. Higher operating pressure or shut-off differential pressure versions are available on individual request, with operating limits specified for the application.
Sealing and testing
The elastomer-seated configuration provides bidirectional shut-off. The catalogue specifies leakage Rate A according to ISO 5208, with testing according to EN 12266-1. Test conditions and operating limits are stated in the valve datasheet.
Valve selection
Send your specification or enquiry with the required size, operating pressure, shut-off differential pressure, temperature, medium, solids content and actuation. Zondex will select the suitable body, gate and seat ring materials and provide a technical datasheet and dimensional drawing.
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