Simulation of Knife Gate Valve using Autonomous Valve CFD

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 beveled edges on the bottom which cut through the flow containing suspended solids. Its primary use is in the pulp and paper industry. The 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 the 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 is 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 a 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