Product Overview

Off-centre fixed setting by-pass kit, code 668000S1
Function
In radiant panel systems, the medium distribution circuits can be totally or partially shut off by closing the thermo-electric
valves in the manifolds.
After reducing the flow rate, the differential pressure in the circuit may increase up to values which can result in noise, high
medium speed, mechanical erosion and hydraulic unbalancing within the system.
The differential by-pass kit for manifolds keeps the flow and return pressure of the manifold circuit balanced as the flow rate
varies.
This valve is fitted for quick coupling with the 668...S1 series manifolds, reducing the overall dimensions to a minimum.
Technical specifications
Materials
Nuts: brass EN 12165 CW617N
Ø 18 gauged pipe with folder: copper
Check valve obturator: PA
Spring: stainless steel
Seals: EPDM
Seals: non-asbestos fibre
Performance
Medium: water, glycol solutions
Max. percentage of glycol: 30%
Max. working pressure: 10 bar
Working temperature range: 0–100°C
Fixed setting differential pressure: 25 kPa (2500 mm w.g.)
Connections: 1” x 3/4” F with captive nut
Dimensions
A
3/4"
C
25
B
1"
Code
668000S1
Mass (kg)
0,16
A
B
143
C
Product range
Code 668000S1 Off-centre assembly with fixed setting by-pass sizes 1” x 3/4”
1
2
3
4
L/MIN
CAMERA
CALEFFI
CAMERA
CALEFFI
1
2
3
4
L/MIN
1
2
3
4
L/MIN
HOBBY
CAMERA
CALEFFI
HOBBY
CAMERA
CALEFFI
CAL EFFI
CAL EFFI
1
2
3
4
L/MIN
1
2
3
4
L/MIN
WC
SOGGIORNO
WC
SOGGIORNO
1378 1 2910 1116 4 318 514 17 615
System
Return
12
50
40
30
20
10
∞C
50
40
30
20
10
System
Flow
1) Flow manifold with flow meters and flow rate balancing valves,
667...S1 series
2) Return manifold with built-in shut-off valves fitted for
thermo-electric actuator, 666...S1 series
3) Flow end fitting with two-position ball valve, automatic air vent and
fill/drain hose connection, code 599674
4) Return end fitting with three-position ball valve, by-pass connection
and fill/drain hose connection, code 599675
5) Off-centre fixed setting by-pass kit complete with pipe for manifold
connection code 668000S1
6) Automatic air vent, code 502043
7) Shut-off ball valve, 391...S1 series
8) Brackets for box or wall mounting, code 658100
9) Strainer, 120 series
10) AUTOFLOW
®
, 120 series
11) Push-fit thermometer for panel pipe, code 675900
12) Fitting for plastic or multilayer panel pipe, 680 series
13) Compression fitting for annealed copper, hard copper, brass, mild
steel and stainless steel, specifically designed for use with 668...S1
manifolds, O-Ring seal, 347...S1 series.
14) Reduction fitting, code 3642..S1
15) Screw plug, code 386500
16) Thermo-electric actuator, 6561 series
17) Thermo-electric actuator with manual opening and position
indicator, 6563 series
18) Box, code 659..4 and code 661..5
MANIFOLDS AND ACCESSORIES