To count the number of convolutions in a metal bellows you count the spaces between the bellows plates. Cooling jacket Surrounds the stuffing box of the pump to control the temperature of the fluid in the stuffing box. Usually molded into the back plate. Coupling Used to connect the pump to the driver. It transmits torque and compensates for axial growth, but not for radial misalignment.
Any object made of an elastic material has a natural period of vibration.
When a pump rotor or shaft rotates at any speed corresponding to its natural frequency, minor unbalances will be magnified. These speeds are called the critical speeds. Cryogenic Very cold temperatures. Cutwater Directs the pumped liquid to the discharge piping. A device used in some seal applications to separate solids from liquid by utilizing centrifugal force.