Abstract
Bypass system is used to balance the pressure of the fluid between upstream and downstream of the valve before the opening of the main valve in order to achieve the rated capacity. They also reduce the fluid velocity in the early stages of operation. Conventional bypass system is made of a main valve of large diameter, a secondary valve and additional piping. Based on more than 30 years in developing and manufacturing butterfly valves from 1″ up to 150″, KSB developed a new product to integrate a bypass valve within a double disc. Main advantages are reduction of piping, joints, and tightness improvement. This study concerns the mechanical and hydraulic behaviour of a bypass butterfly valve with double disc to replace the conventional bypasses. A numerical model was performed (ANSYS CFX©) to study the flow around the double butterfly valve through hydraulic pressure loss and hydrodynamic torque coefficients. With computational fluid dynamics, it is possible to predict the hydrodynamic torque versus opening angle characteristic. One of the key parameter of butterfly valves design is to master the hydrodynamic torque that has great impact on actuator size. With this new design, actuator sizing is improved by about 30 %. This model is also used to design the configurations studied in the experimental approach. The tests carried out on the test facility of CETIM concerned the measurement of static pressure upstream and downstream of the prototype and the flow rate in order to know the pressure losses. The hydrodynamic torque measurements were performed using strain gauge inserted between the actuator and the valve neck. This experimental phase was used to validate the numerical model. It will allow KSB to size new system with virtual prototype.
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Notes
- 1.
CETIM: Technical Center for Mechanical Industry was created in 1965, upon request from mechanical industry companies in order to provide companies with means and competences to improve their competitiveness, take part in standardization, establish a relationship between scientific research and industry, promote technical progress, provide assistance to improve performance and guarantee quality.
Abbreviations
- \( C \) :
-
[N.m] operating torque of valve
- \( C_{d} \) :
-
[N.m] hydrodynamic torque
- \( C_{f} \) :
-
[N.m] friction torque of bearings
- \( C_{h} \) :
-
[N.m] hydrostatic torque
- \( C_{g} \) :
-
[N.m] offset torque of gravity
- \( C_{s} \) :
-
[N.m] seat torque
- \( C_{m} \) :
-
[.] hydrodynamic torque coefficient (aerodynamic)
- \( d \) :
-
[m] internal diameter of secondary valve
- \( d_{i} \) :
-
[.] fluid density by density of water
- \( D \) :
-
[m] internal diameter of main valve and penstock
- \( K_{v} \) :
-
[m³/h/bar½] coefficient of flow reduces
- \( K_{h} \) :
-
[.] coefficient of hydrodynamic torque
- \( Q_{v} \) :
-
[m³/s] flow
- \( U \) :
-
[m/s] velocity of flow
- \( \alpha \) :
-
[°] angle of main disc
- \( \beta \) :
-
[°] angle of secondary disc
- \( \Updelta_{P} \) :
-
[Pa] head loss
- \( \Uppsi \) :
-
[°] relative angle
- \( \rho \) :
-
[Kg/m³] density of water
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Large, J., Fouque, J., Reungoat, D. (2014). Study of the Hydrodynamic Phenomena and Fluid–Structure Interactions of a Bypass Butterfly Valve with Double Disc. In: Gourbesville, P., Cunge, J., Caignaert, G. (eds) Advances in Hydroinformatics. Springer Hydrogeology. Springer, Singapore. https://doi.org/10.1007/978-981-4451-42-0_28
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DOI: https://doi.org/10.1007/978-981-4451-42-0_28
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