Parker Lucifer - Coeva

Principles of operationSolenoid valves are electro-mechanicaldevices that control fluid flow. This isachieved by opening or closing one orseveral orifices in the solenoid valve.The (solenoid) coil is the electricalelement that converts an electrical signalinto a mechanical force which, in turn,shifts the mobile plunger that opens orcloses an orifice (nozzle) by means of itsseat disc(s).Solenoid valves are usually constructedfrom 3 distinct components:• the body (including the sleeveassembly)• the coil (or coil housing)• the housing (or nut/nameplate fixingelements).These 3 modular components are inmany cases interchangeable i.e. a valvebody can be used with a number ofcoil/housing combinations. Thiscatalogue presents the mainrecommended versions. Your distributorwill be pleased to speak to you aboutother specific versions.Pilot operated valves (see fig. 2 and 3)In cases where it is necessary to controlhigher flow/higher pressure it isnecessary to use pilot operated valves.The supply pressure enters the directoperated "pilot stage" which directs theflow to a "pilot chamber" which, in turn,applies the pilot pressure over a largearea (generally a diaphragm or a piston).Therefore, a large force is generated tomove the main sealing elements againsthigher pressure or over a large orifice.One condition of operation is to have aminimum pressure (indicated in thecatalogue table) available to shift thevalve. In most applications this presentsno particular problems (refer to"Magnalift valves" below). The pressurerating of the valve starts from aminimum value (0.3 or 0.5 bar) up tothe maximum value.Magnalift valves (see fig. 4)The magnalift valves combine thefeatures of a direct operated and a pilotoperated valve. A mechanical linkbetween the plunger and the diaphragmretainer allows the valve to operate as adirect operated valve at low pressuresand as a pilot operated valve at higherpressures.The advantage of this design is that thepressure rating of the valve starts fromzero bar to the maximum value.Magnalift valves are specified when thevalve controls the emptying/filling of atank under gravity.Direct operated valves (see fig. 1)The magnetic force is used directly toopen or close the passage of fluid at theplunger sealing. The performance islimited by the available performance ofthe coil (limits of pressure/orifice size.)The pressure rating of the valve startsfrom zero bar to the maximum value.Fig. 2Fig. 4Fig. 1Fig. 3385 Parker Lucifer SA385 Fluid Control Division Parker Europe Lucifer SACH-1227 Fluid Carouge-GenèveControl Division EuropeCH-1227 Carouge-Geneva