7.5.8.84 PEnum_ValveOperation

7.5.8.84.1 Semantic definition

7.5.8.84.2 Type values

Type	Description
`DROPWEIGHT`	A valve that is closed by the action of a weighted lever being released, the weight normally being prevented from dropping by being held by a wire, the closure normally being made by the action of heat on a fusible link in the wire
`FLOAT`	A valve that is opened and closed by the action of a float that rises and falls with water level
`HYDRAULIC`	A valve that is opened and closed by hydraulic actuation
`LEVER`	A valve that is opened and closed by the action of a lever rotating the gate within the valve
`LOCKSHIELD`	A valve that requires the use of a special lockshield key for opening and closing, the operating mechanism being protected by a shroud during normal operation
`MOTORIZED`	A valve that is opened and closed by the action of an electric motor on an actuator
`PNEUMATIC`	A valve that is opened and closed by pneumatic actuation
`SOLENOID`	A valve that is normally held open by a magnetic field in a coil acting on the gate but that is closed immediately if the electrical current generating the magnetic field is removed
`SPRING`	A valve that is normally held in position by the pressure of a spring on a plate but that may be caused to open if the pressure of the fluid is sufficient to overcome the spring pressure
`THERMOSTATIC`	A valve in which the ports are opened or closed to maintain a required predetermined temperature
`WHEEL`	A valve that is opened and closed by the action of a wheel moving the gate within the valve
`OTHER`	required category not on scale
`NOTKNOWN`	Value is unkown
`UNSET`	Value has not been specified

Table A