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S U D E

Knife Edge Gate Valves

Knife Edge Gate Valves- 1600, 1650, 1660 Series

Knife Edge Gate Valves are compact, heavy-duty isolation valves designed for reliable shut-off in slurry, solid-laden, fibrous, and viscous media. Featuring a full-bore, bi-directional design, these valves deliver excellent flow characteristics, minimal pressure drop, and dependable sealing even under the most demanding service conditions.
The valve is constructed with a one-piece, corrosion-resistant body and a precision stainless-steel knife-edged gate. The sharp knife edge at the bottom of the gate enables it to cut through semi-solids, fibrous pulps, fly ash, chips, and sludge, ensuring smooth closure and tight shut-off. Retainer rings mechanically lock the seats, allowing easy seat replacement during maintenance.
A twin-packing arrangement or packing-less elastomer sleeve design (for slurry types) ensures high operational reliability, zero leakage, and reduced maintenance. The compact construction minimizes installation space, reduces weight, and simplifies operation—making these valves ideal for harsh industrial environments.


Technical Specifications

Parameter
Specification
Valve Type
Uni-directional / Bi-directional Knife Edge Gate Valve
Sizes
DN 50 to DN 2000 (larger on request)
Series
1600 - Manual Knife Edge Valve, 1650 - Motorized Knife Edge Valve, 1660 - Pneumatic Knife Edge Valve
Body Material
CI / CS / SS304 / SS316 / SS304L / SS316L
Gate
Stainless-steel knife-edged gate
Stem
Stainless steel, rising / non-rising
Seat
Metal-to-metal / Soft seat (Rubber / PTFE)
Port
Round / V-Notch
End Connections
Flanged / Wafer / Full Lug / Two Lug
Standards
ANSI / DIN / BS / JIS
Pressure Rating
PN10 or PN16

Design & Construction:

Constructed with a one-piece corrosion-resistant body and a precision stainless-steel knife-edged gate, the valve features retainer rings for easy seat replacement and a twin-packing arrangement or packing-less elastomer sleeve design for slurry applications, ensuring reliable sealing and reduced maintenance.

Working Principle:

Open Position
Gate fully retracts, providing unobstructed full-bore flow
Closing Action
Knife-edged gate cuts through solids and fibrous media
Closed Position
Gate seats tightly, ensuring bubble-tight shut-off

Automation & Control Options:

  • Control Modes: On/Off, Modulating (3–15 psi / 4–20 mA via I/P Converter)
  • Actuator Types: Spring Return (Fail-Safe), Double Acting
  • Feedback Systems: Limit Switch Box, Position Transmitter
  • Position Control: Pneumatic / Electro-Pneumatic Positioner, I/P Converted

Key Features & Advantages

  • Full-bore design with excellent flow characteristics
  • Knife-edged gate cuts through solids and fibres
  • Bubble-tight shut-off with zero leakage
  • Compact and lightweight construction
  • Low operating torque
  • Replaceable seats for long service life
  • Suitable for abrasive and corrosive media - here a special deflection cone design is assembled

Optional Accessories:

  • Limit switches
  • Position transmitters
  • Electro pneumatic positioners
  • Solenoid valves
  • Integral starter
  • Local position indicator
  • MODBUS / PROFIBUS

Typical Applications:

Slurry, sludge, and viscous media handling in abrasive, fibrous, and solid-laden process lines.

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