乾拓意大利ODE不锈钢两通电磁阀21W3KV190
Moreover, particular attention must be paid in designing the hydraulic circuit to the problem of
water hammering which could cause overpressures such as to lacerate the diaphragm or
damage other parts of the solenoid valve.to close the main orifice. When the coil is energized, movement
of the plunger, on which a gasket is mounted, opens an
orifice on the complete diaphragm (pilot orifice) and discharges
the chamber above the diaphragm. At the same time
the plunger exercises direct force on the diaphragm, aiding its
opening. The sum of this force and the unbalance of pressures
on the two sides of the diaphragm causes the
diaphragm to move and open the main orifice.
functioning
is ensured by the direct action of the plunger on the
diaphragm. So, also in this case, when the coil is not energized
there is fluid under pressure in the chamber above the
diaphragm while beneath the diaphragm there is pressure
only in the area external to the main orifice: therefore the
resultant of the forces on the diaphragm is such as to push it
Notes:
In this family of solenoid valves there must not be a minimum
pressure difference between the inlet and outlet pipes to
ensure correct functioning of the solenoid valve.
However, an excessive pressure difference between inlet and outlet, as with 2 way normally
closed direct acting solenoid valves, causes an increase in the force required to open the pilot
orifice, so if this pressure difference is greater than the maximum value for which the solenoid
valve has been designed, the latter may not open even when the coil is energized.
For a correct operation of the solenoid valve, and to avoid a quick wear of the diaphragm, it
is advisable that, once starting the valve closing, the actual flow isn’t higher than the Kv (i.e.:
flow rate through the valve with a pressure loss of 1 bar).

乾拓意大利ODE不锈钢两通电磁阀21W3KV190