a component fitted in a pressure system line to restrict the gas flow, typically to damp oscillations in pressure.
1. A device which is used to damp the motion of the valve stem. This is usually accomplished by an oil filled cylinder/piston assembly. The valve stem is attached to the piston and the flow of hydraulic fluid from one side of the piston to the other is restricted. 2. A mechanical or hydraulic device for restraining motion. 3. A device installed between an instrument and the process used to protect the instrument from rapid pressure fluctuations.
a device to reasonably control vibration, it uses downward pressure to add resistance against the wobbling tub