Indirectly operated valves, sometimes also called pilot-operated, operate on the principle of differential pressure between inlet and outlet.
Indirectly operated valves (Pilot-operated) This is a more widely used variant for safety reasons in the events of a power failure.
When power gets interrupted, magnetic field disappears and the plunger spring compresses it back to its original position. The force of the magnetic field raises the plunger against the spring, which in turn pushes it back down. The valve thus opens to allow the medium to flow. With a normally closed valve, when powered the plunger is pulled up due to the magnetic field. Without power, the valve can be either closed or open. The magnetic field moves this plunger and thus closes or opens the valve. When an electric current is applied to the coil, a magnetic field is generated, the strength of which depends on the current, the number of windings of the wire and the material of the moving core, also referred to as a piston. The two main categories of solenoids are NO and NC - normally open and normally closed. 1) coil 2) armature 3) shielding ring 4) spring 5) plunger 6) seal 7) valve body 8) body orifice 9) diaphragm Normally open or normally closed?
0 kommentar(er)
