Written by Aaditya Ruiker
Wednesday, December 23, 2020
Simulation of Knife Gate Valve using Autonomous Valve CFD
By
Aaditya Ruiker
Written by Prathamesh Badadal
Gate valve is a lift type of valve. The valve closure is a barrier(gate) which when lifted
allows the flow to pass through the aperture. Gate valves are used only for isolation
operations. The distinct feature of gate valves is the low resistance to flow when fully
open.
Understanding the Knife Gate valve
It is a type of gate valve in which the barrier/gate has sharp bevelled edges on the
bottom which cut through the flow containing suspended solids . It’s primary use is in
the pulp and paper industry. Specialization includes handling slurry, viscous, corrosive
and abrasive media.They are generally unidirectional.
Figure 1: Knife Gate Valve.
To elaborate :
Valve closure element: Knife shaped flat disk
Valve closure mechanism: Plate connected to actuating mechanism
Advantages:
1) Low weight compared to other types of gate valves
2) Can be used for flow involving suspended flows
Disadvantages:
1) Unsuitable for low pressure applications.
2) Less used in applications involving sanitary and hygienic conditions
About the simulation:
The simulation is about a DN 50 knife edge gate in fully open condition. Tested for
ON-OFF type operation this simulation predicts the pressure distribution around the
valve seats. The max gross CV is 283.13 for full opening. Below are the images of
flowlines, velocity and pressure contours taken from the app.
Figure 2: Velocity contour for full opening of the Knife Gate Valve.
Figure 3: Pressure contour for full opening of the Knife Gate Valve.
Figure 4: Streamlines for full opening of the Knife Gate Valve
To know more about the simulation visit :
Simulation of Knife Gate Valve using Autonomous Valve CFD
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