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COVNA 4 inch Water Stainless Steel Wheel Handle Knife Gate Valve
| Item | COVNA 4 inch Water Stainless Steel Wheel Handle Knife Gate Valve |
| Size Range | 2"~80", DN50~DN2000 |
| Presssure | 0.6MPa~2.5MPa |
| Temperature | -38°C~1100°C |
| Connection | Flanged End |
| Flange Drilling | ANSI B16.5, GB/T9113, JB/T79, HG, SH, JIS, DIN, NF, BS |
| Material | Stainless Steel, WCB |
| Sealing Material | PTFE, Metal Seated |
| Leakage | PTFE Grade A (Zero Leakage), Metal Seated Grade D (Liquid 0.1xDN mm³/s) |
1. Description
The Knife Gate Valve is an uni-directional / Bi-directional wafer
valve designed for general industrial service applications. The
design of the body and seat assures non-clogging shut off on
suspended solids in industries such as:
• Pulp and Paper
• Wastewater treatment plants
• Food and Beverage
• Mining
• Power plants • Chemical plants
• Bulk handling
| Model | Size | Flange Standard | Test Pressure (Mpa) | Working Temp. | Medium | |
| Body Strength | Seal | |||||
| PZ73X-16RQ | DN50-DN350 | PN10/PN16/150LB | 1.6 | 1.0 | ≤80ºC | Water, Pulp, Sewage, Coal |
| DN400-DN600 | 1.0 | 0.6 | ||||
| DN700-DN950 | 0.6 | 0.4 | ||||
| DN1000 | 0.6 | 0.3 | ||||
| DN100-DN1400 Other size (ON request) | 0.5 | 0.3 | ||||
2. Maximum Seal and Packing Temperatures
| Max Temperature (ºC) | Seal | |||
| EPDM | VITON | NITRILE | GRAPHITE | |
| 120 | 200 | 120 | 600 | |
| Max Temperature (ºC) | Packing | |
| NBR | GRAPHITE | |
| 80 | 600 | |
3. Technical Requirment
Material: GGG40/50; CF8; CF8M; 2205; 2507
Connection Model: Lug Type,. Flange Type
Connection Standard: DIN EN 1091-1; GB/T 9119-2000; JIS 10K; ASME B
16.5
Size Range: 2inch to 24 inch
Drive Mode: Level: Gear Box: Penematic: Motor
The knife gate valve is a uni-directional wafer valve for general
industrial application.
The nominal diameter available range from DN50 to DN600 with Lugged
flange connections complying with EN 1092-1 PN10/PN16 or
alternatively, ANSI B16.5.
The knife gate valve is predominantly used in the paper and pulp,
chemical, and mining industries, andthe food industry as well as
sewage treatment plants, and in the sugar, steel and animal feed
sectors.
Drive actuators offered for the knife gate valve include handwheel
with rising or non-rising stem, or alternatively double-or
single-acting pneumatic cylinders (spring return), Bevel Gear,
chain gear and electric actuators.
The structure of the uni-directional knife gate valves is a wafer
style cast monoblock body, with raised face and reinforced ribs for
larger nominal diameters for extra body strength.
The monoblock body of the knife gate valves is available in either
WCB or alternatively in stainless steel CF8M/CF8/CF3/CF3M.
The slide plate of the knife gate valves is using stainless steel
AISI 304,201,301,304L, 316L or AISI 316 or else. The plate radius
of the knife gate valves slide gate has a bevelled cutting edge. As
a result, solids can be cut through, achieving a tight seal in the
closed position. On request, the thickness of the knife gate valves
plate can be increased for higher operating pressures and/or higher
quality material can be used.
The slide plate's seat in the monoblock body is sealed tight by an
elastomer seal in Body groove or Metal to metal sealing.
The standard material used for the knife gate valves elastomer seal
is EPDM/ NBRor Metal seat
Alternatively, nitrile, viton, PTFE or else are available.
The gland packing consists of several layers of braided fibre.
