Regulus - Heat pumps and solar systems - 3-way, threaded, spring

3-way, threaded, spring - return

3-WAY ZONE VALVES, THREADED, SPRING - RETURN
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	K_vsm³/h
SF 15 7.001.01739.0	SF 15-M1 7.001.01753.0	SF 15-E 7.001.02097.0		154 kPa	6,6
SF 15-EB 7.001.01876.0	SF 16-EB 7.001.011861.0			154 kPa	6,6
SF 20 7.001.01770.0	SF 20-M1 7.001.01787.0	SF 20-E 7.001.01913.0		154 kPa	7,8
SF 20-EM1 7.001.01935.0	SF 20-EB 7.001.01888.0	SF 20-F 7.001.01983.0	SF 20-F-M1 7.001.01986.0	154 kPa	7,8
SF 25 7.001.01808.0	SF 25-M1 7.001.01827.0	SF 25-E 7.001.01954.0		62 kPa	12,6
SF 25-EM1 7.001.01969.0	SF 25-B 7.001.01846.0			62 kPa	12,6

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	20
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:
A 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	G1/2"	92	46	46	84	130
SF 20	G3/4"	92	46	46	84	130
SF 25	G1"	92	46	46	88	134
							With internal thread SF 20

TYPE	DN	A	B	C	D	E
SF 20 E	G3/4"	92	46	20	84	130
SF 25 E	G 1"	92	46	46	88	134

							With external thread SF 20 E

TYPE	A	A
SF 15 EB	53	137
SF 16 EB	53	137
SF 20 EB	53	139
			Connections for Cu-tubes - EB	Connections for Cu-tubes - B

Valve identification :

		Nominal dimensions	Type of fittings	Auxiliary microswitches			Voltage
SF 3way	15	G1/2" or copper tube diameter 15	- internal thread E - externalthread EB - compressionseal B - compression seal for ND 25	M1	1 single-pole	24	24 V
	16	copper tube diameter 16		M1S	1 two-pole	110	110 V
	20	G 3/4" or copper tube diameter 22		M2	2 single-pole	-	230 V
	25	G1" or copper tube diameter 28		M2S	2 two-pole	240	240 V

Application example as 3-way zone valve
The zone room thermostat controls opening and closure of the respective SF valves. When there is no demand it shuts off power to the valve which closes the zone and recirculates water back to the boiler return. Installing a meter as shown in the diagram permits efficient subdivision of operating costs. The recirculation pipeline should be balanced to avoid excess flow rate variations in other circuits during valve operation.

Legend

Z	zone served by the valve
C	boiler
P	circulation pump
SF	zone valve
TA	zone room thermostat
H	meter

Application example giving priority to the hot water heater
We use this installation system mainly on combined boilers to permit the temperature of domestic hot water to be adjusted at the desired value. The valve is used for priority over the heating system.

Legend

I	heating system
TA	room thermostat
TB	hot water storage tank thermostat (60°C)
SF	diverter valve
P	circulation pump