Parker Solenoid Valve

Parker Solenoid Valve is an electro-mechanical device that controls fluid flow. This is achieved by opening or closing one or several orifices in the solenoid valve. The (solenoid) coil is the electrical element that converts an electrical signal into a mechanical force which, in turn, shifts the mobile plunger that opens or closes an orifice (nozzle) by means of its seat disc(s). Solenoid valves are usually constructed from 3 distinct components:

the body (including the sleeve assembly)
the coil (or coil housing)
the housing (or nut/nameplate fixing elements)

These 3 modular components are in many cases interchangeable i.e. a valve body can be used with a number of coil/housing combinations.

1-Direct operated valves

The magnetic force is used directly to open or close the passage of fluid at the plunger sealing. The performance is limited by the available performance of the coil (limits of pressure/orifice size.) The pressure rating of the valve starts from zero bar to the maximum value.

2-Pilot operated valves

In cases where it is necessary to control higher flow/higher pressure, it is necessary to use pilot operated valves. The supply pressure enters the direct-operated “pilot stage” which directs the flow to a “pilot chamber” which, in turn, applies the pilot pressure over a large area (generally a diaphragm or a piston). Therefore, a large force is generated to move the main sealing elements against higher pressure or over a large orifice. One condition of operation is to have a minimum pressure available to shift the valve. In most applications, this presents no particular problems (refer to “Magnalift valves” below). The pressure rating of the valve starts from a minimum value (0.3 or 0.5 bar) up to the maximum value.

3-Magnalift valves

The magnalift valves combine the features of a direct operated and a pilot operated. A mechanical link between the plunger and the diaphragm retainer allows the valve to operate as a direct operated valve at low pressures and as a pilot operated valve at higher pressures. The advantage of this design is that the pressure rating of the valve starts from zero bar to the maximum value. Magnalift valves are specified when the valve controls the emptying/filling of a tank under gravity.