Knife Gate Valve Design and Application

Linuo knifegate valves are linear shut off valves that are light weight with compact construction. Valves are available as manual with handwheel, or can be automated with pneumatic cylinder  actuator for remote operation. The arc shape of the gate of our knife gate valve is designed to be particularly suitable for cutting off fluid containing fiber or suspended particles, so the knife gate valves are ideal for many applications in the process industries of Pulp & Paper, Wastewater Treatment, Mining, Sugar Making, and Chemical Processing.


Replaceable Seats
Seats in the Linuo knife gate valves are backed with by an o-ring to give the seat a self-compensating wear function. This results in excellent seat tightness and prolonged life cycle. When seats do wear and need replacement, maintenance to change the seats is easy and fast. Available seat materials include metal seated, EPDM seated, and PTFE seated. Contact Linuo for assistance in seat selection.

Gate Design
Each gate is precision ground and hard Chrome plated as a standard. This provides superior abrasion and corrosion resistance. The arc shape design of the bottom of the gate is particularly suitable to provide strong cutting force for pulp media.

Guiding Wedges
Guiding wedges are point-located at the valve outlet, providing for a groove-free and smooth port. This reduces clogging or material build-up.

External Packing
Packing gland and packing are externally located, so packing can be adjusted or replaced without removing the valve from the pipeline.

Double Stem Bearings
At the top of the yoke, our knife gate valves are equipped with two stem bearings for reduced torque and easy operation.

Port Shape Option
Custom port shapes including V-port, triangle port, and hexagon port are available. Consult Linuo
with your specific needs.

Technical:

• Nominal Diameter: 2” (DN50) through 48” (DN1200)
• Nominal Pressure Rating: ANSI 150
• Connection Type: Wafer
• Temperature: Metal Seat -4ºF to 446ºF, PTFE Seat -4ºF to 248ºF, EPDM Seat -4ºF to 212ºF
• Applicable Medium: Pulp, sewage, coal slurry, syrup, slag.
• Leakage: Each Linuo valve will go through pressure testing. As per the MSS SP-61 standard, the maximum allowable leakage of metal seated knife gate valves is 40 ml/min/in. For soft seated knife gate valves, the maximum leakage is 4 ml/min/in.