30 th November at 11.50
Valve World Conference Lounge – Room 2
Fair ground Düsseldorf
Ms. Leire Colomo, Product Development, will present a conference about “Torque increase due to heavy packing tightening in valves”.
In the current valve market, type testing is frequently required to homologate valve designs to different standards and specifications. Internal tightness and fugitive emissions are topics that are mostly covered by these testing programs. There are differences amongst them in terms of test fluids, thermal and mechanical cycles, and leak allowances, but they have some common points: all of them use dry gas as a test fluid and they require performing above one hundred mechanical cycles in ambient temperature.
Valves supplied with only graphite packing to perform the tightness between the shaft and the bonnet require high gland tightening torques in order to achieve low emission levels. In quarter turn valves however, these torques, in combination with some testing values for parameters such as cycling velocity and valve materials, can lead to severe increases in the valve torque figures. In this conference we will explain you why.