ISO Standard Bimetallic Coil Spring for Cooling System 18Q71

Wuhu Boton Automobile Parts Factory is a professional manufacturer with Boton brand and self-developement capacity. Our core competencies is thermostatic bimetal components, thermometer, jumping disc toys, heating chamber for engine carburetors, auto generator regulars,various auto glass lifter motor protector.

Bimetallic coil spring consists of two or more metallic strips with different thermal expansion bonded together. When heated up, it bends in a pre-determined manner and can be used to monitor, measure and regulate temperature.

Coiling of the thermostatic bimetal achieves greater “active length” within a small space, thus maximizing the possible displacement.

One end of the spiral /helical coil is permanently fixed .the loose end describes a rotary path in response to a change in temperature.

The choice between a spiral or a helical coil depends on the intended application.

Spirals are preferred for measuring ambient temperatures (room temperature, sauna thermometer).

The material of bimetallic coil spring -thermostatic bimetals have been standardized in a number of countries.

The relevant standards usually contain data on materials, their properties, dimensions, shapes

and tolerances, as well as test specification and, in some cases, references to other general test standards. Major standards are below:

Germany:

DIN1715 part 1 ,

thermostat metals ; Technical delivery conditions.

DIN1715 part 12,

thermostat metals ; Testing the specific thermal curvature.

SEW 385

Eisenlegierungen mit besonderer wärmeausdehnung

USA:

ASTM B 388

Standard specification for Thermostat Metal Sheet and Strip.

ASTM B 753

Standard specification for Thermostat Component Alloys.

ASTM B 106

Test Method for Flexivity of Thermostat Metals.

Japan:

JIS C 2530

Thermostat Metals for electric apparatus .

Russia:

GOST 10533

Cold-rolled thermostatic bimetallic strip. Specifications

GOST 10994

Precision alloys. Grades

China

GB/T 4461

Thermostatic bimetal strips

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