Week 9 - Parametric study on Gate valve.
Gate Valve:
A gate valve controls the medias flow by lifting the gate (open) and lowering the gate (closed). A gate valves distinct feature is the straight-through unobstructed passageway, which induces minimal pressure loss over the valve. The unobstructed bore of a gate valve also allows for a pigs passage in cleaning pipe procedures, unlike butterfly valves. Gate valves are available in many options, including various sizes, materials, temperature and pressure ratings, and gate and bonnet design
Function:
A gate valves main components as seen in figure 2 are the handwheel (A), spindle (B), gasket (C), bonnet (D), valve body (E), flange (F), and gate (G). The primary operation mechanism is straightforward. Turning the handwheel rotates the stem, which moves the gate up or down via the threads. They require more than one 360° turn to fully open/close the valve. Lifting the gate from the path of the flow, the valve opens. Lowering the gate to its closed position seals the bore resulting in a full closure of the valve.
Geometry:
- Geometry is impoted to spaceclaim and fluid volume is created. Lift value of gate disc is set up as parameter
Meshing:
- Naming of inlet and outlet is done by face selecting command
- Element size = 92.82 mm
- No:of elements = 137317
Fluent setup:
Material : water
staedy state - state pressure - based solver
Turbulence model - K epsilon
inlet pressure = 10Pa
Outlet - pressure outlet
Method - coupled
case 1: 10 mm lift
case 2: 20 mm lift
case 3 : 35 mm lift
case 4 : 45 mm lift
case 5 : 50 mm
case 6: 60 mm
case 7 : 80 mm
results:
| Lift | mass flow rate in kgs | Q | Flow factor(Kv) | Flow coeffecient(Cv) |
| 10 | 0.149 | 0.5364 | 53.64 | 62.01 |
| 20 | 0.24008 | 0.8642 | 86.42 | 99.9 |
| 35 | 0.415 | 1.494 | 1.494 | 172.71 |
| 45 | 0.5131 | 1.847 | 1.847 | 213.52 |
| 50 | 0.559 | 2.012 | 2.012 | 232.6 |
| 60 | 0.632 | 2.275 | 2.275 | 263 |
| 80 | 0.7637 | 2.533 | 2.533 | 292.83 |
Conclusion:
As lift increases outlet mass flow rate increases