Knife Gate Valve 108 – polyurethane lined
Technical Specifications
Nominal diameter DN50-800- Nominal pressure PN10-16
- Medium temperature -20 °C ... +100 °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 | 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 |
Tabular values for diameters DN500–DN800 and for pressure PN16 are available upon request
Product Description
Knife gate valve model 108 is a unidirectional isolation valve for liquids containing fine abrasive solids. Its dismantlable two-piece body and one-piece polyurethane (PU) seat provide a protected flow passage. Body material options include ductile iron, carbon steel, stainless steel and duplex stainless steel.
The PU seat incorporates a guide groove for the gate and lines the flow passage to help protect the body from abrasive wear during normal operation. With the gate fully open, the flow passage remains unobstructed. The PU compound, gate material and actuation are selected for the process conditions.
Available configurations
- Size range: DN 50–800;
- Connections: wafer or lug, with PN10 or PN16 flange drilling according to EN 1092-1;
- Body: dismantlable two-piece construction;
- Sealing direction: unidirectional;
- Seat: one-piece polyurethane (PU);
- Operating temperature: −20°C to +100°C, depending on the specified PU compound and operating conditions;
- Operation: handwheel, gearbox, pneumatic or electric actuator;
- Stem: rising or non-rising, depending on the configuration;
- Function: flow isolation.
Design features
- Two-piece body for access to the seat and internal components;
- One-piece PU seat with a guide groove for the gate;
- PU-lined flow passage that helps protect the body from abrasive media;
- Unobstructed flow passage with the gate fully open;
- Body and gate materials selected for the installation and process conditions.
Flow direction and application
Model 108 provides unidirectional shut-off. Install the valve in the direction indicated by the arrow on its body, on a pressurized discharge line. The catalogued configuration is recommended for media containing fine solid particles up to 3 mm.
Typical applications include water-based process liquids and slurries containing fine abrasive particles. Suitability for acids, alkalis or petroleum products depends on the medium composition, concentration, temperature and specified PU compound.
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 / 316L / 316Ti | 1.4301 / 1.4404 / 1.4571 |
| Seat | ||
| Polyurethane | PU | Compound selected for the application |
Body, gate and PU seat materials are selected for the operating conditions. The material combination and operating limits are specified in the valve datasheet.
Pressure and dimensions
PN10 and PN16 flange drilling options are available. The allowable operating pressure and maximum shut-off differential pressure depend on the nominal size, valve construction and operating conditions. Connection dimensions and face-to-face length are specified for the selected configuration.
Higher operating pressure or shut-off differential pressure requirements can be assessed for an individual configuration on request.
Sealing and testing
Seat tightness is specified as 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, particle size and actuation. Zondex will select the suitable configuration and provide a technical datasheet and dimensional drawing.
Ask them to us!
form below and send
your application to the following e-mail address