| Name | Description |
|---|
| DROPWEIGHT |
 | Drop Weight | 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 |
| Float | A valve that is opened and closed by the action of a float that rises and falls with water level |
|
| HYDRAULIC |
| Hydraulic | A valve that is opened and closed by hydraulic actuation |
|
| LEVER |
| Lever | A valve that is opened and closed by the action of a lever rotating the gate within the valve |
|
| LOCKSHIELD |
| Lock Shield | 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 |
| Motorized | A valve that is opened and closed by the action of an electric motor on an actuator |
|
| PNEUMATIC |
| Pneumatic | A valve that is opened and closed by pneumatic actuation |
|
| SOLENOID |
| 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 |
| 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 |
| Thermostatic | A valve in which the ports are opened or closed to maintain a required predetermined temperature |
|
| WHEEL |
| Wheel | A valve that is opened and closed by the action of a wheel moving the gate within the valve |
|
| OTHER |
| (other) | Value is not listed. |
|
| NOTKNOWN |
| (unknown) | Value is unknown. |
|
| UNSET |
| (unset) | Value has not been specified. |
|
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