Datasheet

Working Principle
Energized (Main valve side)
Right after energized (Pilot valve open)
De-energized
OUT
OUT
OUT
IN
Warning
Diaphragm
Return
spring
Pressure action
chamber
Supply
orifice
Pressure action chamber
Pilot
orifice
Armature
Supply
orifice
Lift
spring
Supply
orifice
IN
Pressure action chamber
Internal pressure
IN
Internal pressure
Internal pressure
Internal pressure
Internal pressure
Internal pressure
Internal pressure
Internal pressure
Internal pressure
The fluid enters from the IN goes through the
supply orifice to fill the pressure action chamber.
Main valve is closed by the pressure in the
pressure action chamber and the reaction force
of the return spring.
When the coil is energized, the armature is
attracted causing the pilot orifice to opening.
The fluid filling the pressure action chamber
flows to the OUT side through the pilot orifice.
The pressure in the pressure action chamber
decreases by discharging fluid through the pilot
orifice. Because the force which pushes down
the valve is reduced by the discharge of the
fluid, the force that pushes up the main valve
overcomes the push down force and opens the
main valve. The main valve opens by the lift
spring reaction force even if pressure on the IN
side is 0 MPa or very low pressure.
Unstable flow may occur with the product under the following
CONDITIONSsLOWFLOWFROMTHEPUMPORCOMPRESSORETC
sUSE
OF SEVERAL ELBOWS OR TEES IN THE CIRCUIT OR s THIN NOZZLES
INSTALLED AT THEEND OF THEPIPING ETC 4HIS CAN CAUSE VALVE
OPENINGCLOSING FAILURE OR OSCILLATION AND CAUSE A VALVE
MALFUNCTION )F PRODUCTS ARE USED WITH VACUUM THEN THE
VACUUMLEVELCANBEUNSTABLEDUETOTHESECONDITIONS0LEASE
contact SMC to check if the valve can be used in the
APPLICATIONBYPROVIDINGTHERELEVANTFLUIDCIRCUIT
Construction
Series VXZ
For Air
Specifications
For Water
For OilOptions
Construction
Dimensions
For Heated Water
For High
Temperature Oil
21