DROPWEIGHT
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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
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FLOAT
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A valve that is opened and closed by the action of a float that rises and falls with water level
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HYDRAULIC
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A valve that is opened and closed by hydraulic actuation
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LEVER
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A valve that is opened and closed by the action of a lever rotating the gate within the valve
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LOCKSHIELD
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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
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MOTORIZED
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A valve that is opened and closed by the action of an electric motor on an actuator
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PNEUMATIC
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A valve that is opened and closed by pneumatic actuation
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SOLENOID
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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
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SPRING
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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
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THERMOSTATIC
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A valve in which the ports are opened or closed to maintain a required predetermined temperature
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WHEEL
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A valve that is opened and closed by the action of a wheel moving the gate within the valve
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OTHER
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required category not on scale
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NOTKNOWN
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Value is unkown
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UNSET
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Value has not been specified
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