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BP-010 · Wax thermostat
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A
A
B
B
C
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D
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Ø20
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C
SECTION A-A
SCALE 2:1 · DRAWN COLD, VALVE SHUT; PHANTOM: FULLY OPEN
13
8
12
24
9
11
10
DETAIL B
PELLET, RIDING WITH IT · 5:1
0.0
3
15
19
6
DETAIL D
JIGGLE VALVE, SEAT, LIFT · 5:1
88°C
↑ AIR
A
A
Ø58
VIEW C
COVER 2 REMOVED · 1:1
THERMOSTAT DATA
STARTS TO OPEN
88 °C
FULLY OPEN
98 °C
LIFT (STOP)
9.5 mm
HYSTERESIS
2 K
SEAT / BYPASS
Ø34 / Ø20
SPRING, SHUT–OPEN
55–126 N
WAX PRESSURE, OPEN
6.4 MPa
JIGGLE ANNULUS
3.5 mm²
0
2
4
6
8
10
80
84
88
92
96
100
104
100
150
200
250
PELLET TEMPERATURE, °C
LIFT, mm
WAX ΔV, mm³
88
DIAGRAM 1
LIFT vs PELLET T · THIN: HEATING · DASHED: COOLING · ACCENT: THIS RUN
NOTES
1. WAX 1751 mm³ GAINS 12 % MELTING 86–101 °C; LIFT = ΔV / 19.6 mm² (PIN Ø5).
2. PIN 8 BEARS ON BRIDGE 7: THE CUP MOVES DOWN, VALVE 13 OPENS, BYPASS 17 SHUTS.
3. PUMP 40 L/min SPLITS BY PATH AREA; BYPASS SHUT FROM 7 mm LIFT.
4. ENGINE 38 kJ/K, RADIATOR 0.9 kW/K AIR SIDE; TOUR 15–30× REAL TIME.
5. PIN, BOLT, STEM, JIGGLE PIN NOT CUT. TWO BOLTS 4 AT ±120° NOT SHOWN.
ITEM
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DESCRIPTION
WATER OUTLET HOUSING
THERMOSTAT COVER, SPIGOT Ø30
FLANGE SEAL Ø58×3
HEX BOLT M6×25 ISO 4017
WASHER 6.4 ISO 7089
FLANGE AND SEAT Ø54×1.5
BRIDGE 8×1.5
PIN Ø5×44
SLEEVE (SOCK DIAPHRAGM)
PELLET CUP Ø17
WAX CHARGE 1.75 cm³
PISTON GUIDE
VALVE DISC Ø37.6×1.5
MAIN SPRING Ø2, 6 TURNS
SPRING STIRRUP 8×1.5
BYPASS STEM Ø5
BYPASS DISC Ø25×1.5
BYPASS SPRING Ø0.8, 4 TURNS
JIGGLE PIN Ø2.4
COOLANT TEMP. SENSOR M12×1.5
SEALING RING A12×16 DIN 7603
RADIATOR HOSE 30×4.5
HOSE CLIP 32–50 DIN 3017
BACK-UP RING 5×7×1.5
MATERIAL
EN AC-46000 (AlSi9Cu3)
PA66-GF35
EPDM 70
STEEL 8.8, Zn
STEEL 200 HV
DC04 +ZnNi
DC04 +ZnNi
X5CrNi18-10
HNBR 70
CuZn37
PARAFFIN + Cu POWDER
CuZn39Pb3
DC04 +ZnNi
EN 10270-1 SH
DC04 +ZnNi
CuZn39Pb3
DC04 +ZnNi
EN 10270-1 SH
CuZn37
BOUGHT OUT (NTC)
Cu
EPDM
W4 STAINLESS
PTFE
QTY
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TITLE
WAX THERMOSTAT · SECTION A-A
DWG NO
BP-010
SCALE
2:1
SIZE
A2
SHEET
1 / 1
DRAWN
CLAUDE
DATE
2026-10-15
MATERIAL
SEE PARTS LIST
GENERAL TOL.
ISO 2768-m
UNITS
mm · °C · kW
LIVE · DRAG UP/DOWN TO SET ENGINE LOAD · H HILL · R COLD START · S SPEED
Drag up/down: engine load ·
↑
↓
load ·
H
hill ·
R
cold start ·
S
speed
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