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부품번호 | VX23 기능 |
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기능 | Direct Operated 3 Port Solenoid Valve | ||
제조업체 | SMC | ||
로고 | ![]() |
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전체 30 페이지수
![]() 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
![]() ![]() Solenoid Valves Flow Characteristics
(How to indicate flow characteristics)
1. Indication of flow characteristics
Indication of the flow characteristics in specifications for equipment such as a solenoid valve, etc. is depending on “Table (1)”.
Table (1) Indication of Flow Characteristics
Corresponding
Indication by
Other
equipment international standard indications
Standards conforming to
Equipment for
pneumatics
C, b
—
—
ISO 6358: 1989
JIS B 8390: 2000
S
JIS B 8390: 2000
Equipment: JIS B 8373, 8374, 8375, 8379, 8381
Cv ANSI/(NFPA)T3.21.3: 1990
Equipment for
controlling
process fluids
Av
—
— IEC60534-2-3: 1997
JIS B 2005: 1995
Cv Equipment: JIS B 8471, 8472, 8473
2. Equipment for pneumatics
2.1 Indication according to the international standards
(1) Standards conforming to
ISO 6358: 1989 : Pneumatic fluid power—Components using compressible fluids—
Determination of flow-rate characteristics
JIS B 8390: 2000 : Pneumatic fluid power—Components using compressible fluids—
How to test flow-rate characteristics
(2) Definition of flow characteristics
Flow rate characteristics are indicated as a result of a comparison between sonic conductance C and critical pressure ratio b.
Sonic conductance C : Value which divides the passing mass flow rate of an equipment in a choked flow condition by the
product of the absolute upstream pressure and the density in the standard condition.
Critical pressure ratio b : Checked flow will occur when the pressure ratio (downstream pressure/upstream pressure)
is at or smaller than this value.
Choked flow
: It is the flow in which the upstream pressure is higher than the downstream pressure and where
sonic speed is reached in a certain part of the equipment.
Gaseous mass flow rate is in proportion to the upstream pressure and not dependent on the
downstream pressure.
Subsonic flow
: Flow when the pressure ratio is greater than the critical pressure ratio.
Standard condition : Air in a temperature state of 20°C, absolute pressure 0.1 MPa (= 100 kPa = 1 bar), relative humidity
65%.
It is stipulated by adding the abbreviation (ANR) after the unit depicting air volume.
(standard reference atmosphere)
Standard conforming to: ISO 8778: 1990 Pneumatic fluid power—Standard reference atmosphere,
JIS B 8393: 2000: Pneumatic fluid power—Standard reference atmosphere
(3) Formula of flow rate
It can be indicated by the practical unit as following.
When
P—P21—++—00..—11 ≤ b, choked flow
Q = 600 x C (P1 + 0.1) —27—239—+3t— ·····························································(1)
When
—PP21—++—00..—11 > b, subsonic flow
Q = 600 x C (P1 + 0.1)
1 – ——PP—12—1++——–00—..—b11—–—b 2
—27—239—3+—t ···························· (2)
l lQ : Air flow rate [dm3/min (ANR)], the SI unit dm3 (Cubic decimetre) is also allowed to be described by (liter). 1 dm3 = 1 .
Front matter 1
4페이지 ![]() ![]() Solenoid Valves Flow Characteristics
2.3 Flow coefficient Cv factor
The United States Standard ANSI/(NFPA)T3.21.3:1990: Pneumatic fluid power—Flow rating test procedure
and reporting method for fixed orifice components
defines the flow coefficient Cv factor by the following formula which is based on testing conducted with a test circuit analogo us to
ISO 6358.
Cv = —————Q—————— ·········································································(7)
114.5 —∆P—(—PT2—1+—P—a)
∆P : Pressure drop between the static pressure tapping ports [bar]
P1 : Pressure of the upstream tapping port [bar gauge]
P2 : Pressure of the downstream tapping port [bar gauge]:P2 = P1 – ∆P
Q : Flow rate [dm3/s standard condition]
Pa : Atmospheric pressure [bar absolute]
T1 : Upstream absolute temperature [K]
Test conditions are < P1 + Pa = 6.5 ± 0.2 bar absolute, T1 = 297 ± 5K, 0.07 bar ≤ ∆P ≤ 0.14 bar.
This is the same concept as effective area A which ISO6358 stipulates as being applicable only when the pressure drop is small
in relation to the upstream pressure so that the compression of air is negligible.
3. Equipment for process fluids
(1) Standards conforming to
IEC60534-2-3: 1997: Industrial process control valves. Part 2: Flow capacity, Section Three-Test
procedures
JIS B 2005: 1995: Test method for the flow coefficient of a valve
Equipment standards: JIS B 8471: Regulator for water
JIS B 8472: Solenoid valve for steam
JIS B 8473: Solenoid valve for fuel oil
(2) Definition of flow characteristics
Av factor: It is the value representing the flow of clean water in m3/s which runs through a valve (equipment for test) when the
pressure difference is 1 Pa. It is calculated using the following formula.
Av = Q ——∆Pρ——·····································································································(8)
Av : Flow coefficient [m2]
Q : Flow rate [m3/s]
∆P : Pressure difference [Pa]
ρ : Density of fluid [kg/m3]
(3) Formula of flow rate
It is described by the known unit. Also, the flow characteristics line shown in the Graph (2).
In the case of liquid:
Q = 1.9 x 106Av ——∆GP——·······················································································(9)
Q : Flow rate [l/min]
Av : Flow coefficient [m2]
∆P : Pressure difference [MPa]
G : Relative density [water = 1]
In the case of saturated aqueous vapour:
Q = 8.3 x 106Av ∆P(P2 + 0.1) ··············································································(10)
Q : Flow rate [kg/h]
Av : Flow coefficient [m2]
∆P : Pressure difference [MPa]
P1 : Upstream pressure [MPa]: ∆P = P1 – P2
P2 : Downstream pressure [MPa]
Front matter 4
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