tag class
A valve that permits fluid to flow in one direction only.
A valve that can be used to modify (regulate) the fluid flow rate in a process control system. It usually includes an actuator, which responds to a signal from the controlling system and changes the position of the flow controlling element in the valve.
A valve that is regulated with hand power.
A fluid regulator that relieves pressure from an enclosed space when the pressure reaches a predetermined value.
A valve that includes a means of operation (e.g. spring / gravity / fluid pressure / counter balance), and is not depending on an external source of energy.