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VXR21 Schematic ( PDF Datasheet ) - SMC

Teilenummer VXR21
Beschreibung Direct Operated 3 Port Solenoid Valve
Hersteller SMC
Logo SMC Logo 




Gesamt 30 Seiten
VXR21 Datasheet, Funktion
CAT.EUS70-26 A -UK
Direct Operated
3 Port Solenoid Valve
For Water, Oil, Steam, Air
Reduction of
power consumption
(DC specification)
6 W 4.5 W
78 W W
11.5 W 10.5 W
3New
VX Series VX31/32/33






VXR21 Datasheet, Funktion
Solenoid Valves Flow Characteristics
(How to indicate flow characteristics)
2.2 Effective area S
(1) Standards conforming to
JIS B 8390: 2000: Pneumatic fluid power—Components using compressible fluids—
Determination of flow rate characteristics
Equipment standards: JIS B 8373: 2 port solenoid valve for pneumatics
JIS B 8374: 3 port solenoid valve for pneumatics
JIS B 8375: 4 port, 5 port solenoid valve for pneumatics
JIS B 8379: Silencer for pneumatics
JIS B 8381: Fittings of flexible joint for pneumatics
(2) Definition of flow characteristics
Effective area S: The flow ability of a component, represented by its equivalent "ideal" cross sectional area. This effective area is
calculated under sonic conditions by measuring pressure loss in an air tank. Like sonic conductance C, the
effective area is a method of expressing the flow rate of a product.
(3) Formula of flow rate
When
PP21—++—00..—11 0.5, choked flow
Q = 120 x S (P1 + 0.1) —272—39—3+ t—··································································(3)
When
PP21—++—00..—11 > 0.5, subsonic flow
Q = 240 x S (P2 + 0.1) (P1 P2)
—27—239—3+—t ··············································(4)
Conversion with sonic conductance C:
S = 5.0 x C ·······································································································(5)
Q l:Air flow rate[dm3/min(ANR)], the SI unit dm3 (cubic decimetre) is also allowed to be described by (litre)
S : Effective area [mm2]
P1 : Upstream pressure [MPa]
P2 : Downstream pressure [MPa]
t : Temperature [°C]
Note) Formula for subsonic flow (4) is only applicable when the critical pressure ratio b is unknown. It is the same as the formula
for sonic conductance C (2) only when b=0.5
(4) Test method
Pipe the text equipment to the text circuit shown in Fig. (2). Fill the air tank with compressed air and keep the pressure at a
constant level above 0.6MPa (0.5MPa). Then discharge the air until the pressure in the tank drops to 0.25MPa (0.2MPa).
Measure the time required to dischargue the air and the residual pressure in the air tank after leaving it until the pressure
becomes stable in order to calculate the effective sectional area S by the following formula. Select the capacity of the air tank
according to the effective sectional area of the text equipment. In the case of JIS B 8373, 8374, 8375, 8379, 8381, the pressure
values are in parentheses and the coefficient of formula is 12.9.
S = 12.1 —Vt log10 (—P—Ps —++ 00..11—) —2T93 ·················(6)
S : Effective area [mm2]
V : Air tank capacity [dm3]
t : Discharging time [s]
Ps : Pressure inside air tank
before discharging [MPa]
P : Residual pressure inside air tank
Thermometer
Pressure control
equipment
Pressure switch
Control
circuit
Power
supply
Solenoid
valve
Equipment for test
after discharging [MPa]
T : Temperature inside air tank
before discharging [K]
Air supply Filter
Shut off
valve
Pressure gauge
or
pressure convertor
Timer (Clock)
Pressure recorder
Fig. (2) Test circuit based on JIS B 8390
Front matter 3

6 Page









VXR21 pdf, datenblatt
Glossary of Terms
Pressure Terminology
1. Maximum operating pressure differential
The maximum pressure differential (the difference between
the inlet and outlet pressure) which is allowed for operation,
with the valve closed or open. When the downstream pressu-
re is 0 MPa, this becomes the maximum operating pressure.
2. Minimum operating pressure differential
The minimum pressure differential (differential between the
inlet pressure and the outlet pressure) required to keep the
main valve fully opened.
3. Maximum system pressure
The maximum pressure that can be applied inside the pipeli-
nes (line pressure).
(The pressure differential of the solenoid valve unit must be
less than the maximum operating pressure differential.)
4. Withstand pressure
The pressure which must be withstood without a drop in
performance after returning to the operating pressure range.
(value under the prescribed conditions)
Others
1. Material
NBR: Nitrile rubber
FKM: Fluoro rubber – Trade names: Viton®, Dai-el®, etc.
EPDM: Ethylene propylene rubber
PTFE: Polytetrafluoroethylene resin – Trade names: Teflon®,
Polyflon®, etc.
FFKM: Perfluoroelastomer
Trade names: Kalrez®, Chemraz®
2. Oil free treatment
The degreasing and washing of wetted parts.
3. Passage symbol
In the JIS symbol (
) IN and OUT are in a blocked con-
dition ( ), but actually in the case of reverse pressure
(OUT>IN), there is a limit to the blocking.
( ) is used to indicate that blocking of reverse pressure is not
possible.
Electrical Terminology
1. Apparent power (VA)
Volt-ampere is the product of voltage (V) and current (A). Po-
wer dissipation (W): For AC , W = V.A cosθ. For DC, W = V.A.
(Note) cosθ shows power factor. cosθ = 0.6
2. Surge voltage
A high voltage which is momentarily generated in the shut-off
unit by shutting off the power.
3. Degree of protection
A degree defined in the “JIS C 0920: Waterproof test of elec-
tric machinery/appliance and the degree of protection against
the intrusion of solid foreign objects”.
IP65: Dust-tight, Low jetproof type
“Low jetproof type” means that no water intrudes inside the
equipment that could hinder it from operating normally by
means of discharging water for 3 minutes in the prescribed
manner. Take appropriate protection measures, since a devi-
ce is not usable in an environment where a water drop is
splashed.
Front matter 9

12 Page





SeitenGesamt 30 Seiten
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