7.5.8.84 PEnum_ValveOperation

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

A valve that is opened and closed by the action of a float that rises and falls with water level

A valve that is opened and closed by hydraulic actuation

A valve that is opened and closed by the action of a lever rotating the gate within the valve

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

A valve that is opened and closed by the action of an electric motor on an actuator

A valve that is opened and closed by pneumatic actuation

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

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

A valve in which the ports are opened or closed to maintain a required predetermined temperature

A valve that is opened and closed by the action of a wheel moving the gate within the valve

required category not on scale

Value is unkown

Value has not been specified