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2-way, threaded, spring-return with el. motor

ZONE VALVES, THREADED, SPRING - RETURN WITH ELECTRIC MOTOR
TYPE: SF
Materials:
Valve body, cover, ball-bearing pin : brass
Shut-off ball : EPDM
Return springs : stainless steel
Motor cover : UL 94 NO self-extinguishing ABS
Static O-ring seal : EPDM
Dynamic O-rings seal : VITON
Type of the valve/Nominal diameter DN
identification number
Max. diff. pressure
DPmax
Kvsm3/h
SF 15-2
7.001.01574.0
SF 15-2E
7.001.01724.0
SF 15-2M1
7.001.01586.0
90 kPa
6
SF 15-2-EB
7.001.01693.0
SF 16-2.EB
7.001.01682.0
SF 20-2
7.001.01603.0
SF 20-2E
7.001.02066.0
90 kPa
7
SF 20-2EB
7.001.01704.0
SF 20-2M1
7.001.01618.0
SF 25-2
7.001.01639.0
SF 25-2E
7.001.02283.0
90 kPa
9
SF 25-2M1
7.001.01654.0
SF 25-2-B
7.001.02064.0
Rated pressure
PN
10
Max. working temperature
t max
110°C
Max. room temperature
t pro
60°C
Voltage
U
24V, 230V
Absorbed power
P
5-6W
Degree of protection
IP
20
Aux. contact capacity
3A
Opening time
s
10
Closing time
s
6
Cable length
mm
550


Main characteristics :
 These valves are powered by an electric motor and can assume two operating positions depending on whether or not the motor is activated. One or two auxiliary switches can be installed on request and be actuated when the valve switches. Valves are equipped with an external lever for manually positioning the shut-off ball in its central position.


Operation :
When it is without electricity the valve is positioned as in fig.1 : the valve is closed. When the electrical supply is activated the motor overcomes the force of the spring and moves the ball from way A to an intermediate position in about 10 sec. and the shut-off ball remains in this position until the electrical power supply is deactivated( fig.2). When the electrical power supply is deactivated the return spring brings the shut-off ball back to the way A in about 4 sec.

Without electric power supply


With electric power supply
Using the manual lever:
 The lever is positioned on the side of the servomotor that permits manual positioning of the shut-off ball in an intermediate position(fig.3). This is useful when filling or emptying the hydraulic system. The lever reset, from manual to automatic, takes place automatically whenever the valve is activated by electricity.



Manual lever engaged
M1 - control microswitch
-
 If the identification is without ending, the thread is internal.
E - external thread, ball connections for copper tube
EB -
 - external thread for copper, ball connections for copper tube
B -
 internal thread
Auxiliary switches:
 A single pole microswitch (M1 version), a two-pole microswitch (M1S version) or two microswitches (M2 or M2S version) can be mounted on all versions. There is a special kit for mounting the auxiliary single-pole microswitch even in version that do not carry it as an original part (M1 kit). M1S kits, M2 or M2S cannot be installed on versions which do not mount them originally.
TYPE
DN
A
B
C
D
E
    
SF 15-2
G1/2"
92
46
20
85
105
SF 20-2
G3/4"
92
46
20
85
105
SF 25-2
G1"
92
46
20
84
104
 
With internal thread
 
TYPE
DN
A
B
C
D
E
    
SF 15-2E
G1/2"
92
46
20
84
100
SF 20-2E
G3/4"
92
46
46
84
130







 
With external thread
 
TYPE
A
 		     
SF 15-2EB
53
SF 16-2EB
53
SF 20-2EB
53
 
Connections for Cu-tubes - EB
  
Connections for Cu-tubes - B
  



Valve identification
Type
Nominal dimensions
No. of ways
Type of fittings
Auxiliary microswitches
Voltage V
SF
15
G1/2" or copper tube diameter 15
2
     - internal thread

  E - external thread

  EB - compression seal for Cu-tubes

  B - compression seal for Cu tubes for DN 25
M1
1 single-pole
V
24
24
16
copper tube diameter 16
M1S
1 single-pole
110
110
20
G 3/4" or copper tube diameter 22
M2
2 single-pole
--
230
25
G1" or copper tube diameter 28
M2S
2 two-pole
240
240
Example SF 25-2E M1S 24:: two-way valve, G1" with external thread and 1 auxiliary two-pole auxiliary microswitch, voltage 24V.
Application example as 2-way zone valve
 The fig. illustrates a typical installation layout for 2-way zone valves. It is necessary to use SF valve with a micro-limit switch in order to stop the pump when all the valves are closed. Also other parts available in the market are necessary such as differential by-pass valves to avoid bothersome noise and to ensure a constant pump pressure. 		Application example giving priority to the hot water heater
This system including two-way valves is used when the delivery rate at the system is different from the hot water storage tank requirements. In this case valves with different outlets can be chosen.



Legend:
Z Z zone served by the valve
C boiler
P circulation pump
SF zone valve
I heating system
TA zone room thermostat
TB hot water storage tank thermostat (60°C)