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MODEL
NUMBERS CONSTRUCTION
SMV20-A
Aluminum
316 stainless
SMV20-S
steel/PTFE
SMV30-A
Aluminum
316 stainless
SMV30-S
steel/PTFE
SMV40-A
Aluminum
316 stainless
SMV40-S
steel/PTFE
4.
OPERATING INSTRUCTIONS
The SMV motorized valve requires a +12VDC power supply with a minimum
current rating of 800 mA. The operating power and valve control signals are
supplied via the 9-pin "D" connector located at the side of the valve.
The SMV motorized valve has three modes of operation: Valve Active
(Auto), Valve OFF Control and Valve Purge (Open).
4.1 Valve Active (Auto)
For normal operating in Auto mode the motorized valve requires at least two
control signals:
Direction (TTL logic level, pin 8 on the 9-pin "D" connector)
Speed (0-5 VDC analog signal, pin 4 on the 9-pin "D" connector)
When direction is LOW (GND) valve goes down (closes), when direction is
HIGH valve goes up (opens). The "speed" voltage on pin 4 determines how
quickly the valve will operate. The signal amplitude for "speed" control signal
must remain within the limits of 0 to +5.0 VDC. The 5.0Vdc input signal corre-
sponds to approximately250 steps per second. With resolution of the stepping
motor of 0.0005"/step it results in a maximum speed about 0.125"/sec.
MAXIMUM FLOW RATE
(at 20 psi diff. pressure, 70
air
sL/min
scfh
200
424
200
424
500
1060
500
1060
1000
2119
1000
2119
TABLE I FLOW CONFIGURATIONS
6
F
F)
water
L/min
GPM
5.6
1.48
5.6
1.48
14.2
3.75
14.2
3.75
28
7.4
28
7.4
Cv
CONNECTIONS
0.336
3/8"
0.336
3/8"
0.855
1/2"
1/2"
0.855
1.735
3/4" FNPT
1.735
3/4" FNPT
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