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Description:
1.stable function2.certificate by ISO9001
3.at lest working 100, 000times
4.welcome customized order
spiral / helical coils
Application :
Temperature indication
Axial movement of butterfly valves
Current measurement
Design :
spiral ,helical coils
Operating principle :
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 .
Spiral are preferred for measuring ambient temperature (room temperature ,sauna thermometer ).
Helical coils are more suited to measuring temperature in closed vessels (air,fluid, or solids), as the temperature measuring and indicated points are physically Separate (immersion rod).
Butterfly valve operating mechanisms require stronger thermostatic bimetals as the work demands a high torque .
spiral may also be used in current measuring devices (direct passage of electrical current through the spiral).
Counter-acting spiral are employed for ambient temperature compensation .
When dimensioning housings to accommodate spirals or helical coils,it should be remembered that the spiral/helical coils will change dimension (spirals more and helical coils less ),and that they must not be allowed to come into contact with the housing .
Manufacture :
1.Spiral
These are coiled with intermediate layers to set the distances between the windings.Ideally,the intermediate layers should consist of one or more thermostatic bimetal spirals. The coiled unit is stablished by a process know as "forming annealing" and the intermediate layers then removed. For precision measuring instruments,the individual spirals must be aged once again after forming.
2.Helical coils
These are coiled on a mandrel. The rate of expansion in relation to flexibility has to be determined empirically and taken into account when dimensioning the mandrel. The pitch of the helical coil can be set by adjusting the feed rate .
Thermal deflection rate, is the ratio of angular rotation to temperature change, T is a measure of the coils thermal activity .the equation D= (A2-A1) / (T 2—T1). Where A2 and A1 are angular positions at temperature T2 andT1 respectively.
If you have demand in our product and wanna more information about our product ,please feel free to contact us ! A larger order can get an appreciate discounter !
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Our Advantage
We have our own factory which will give us a great operation ability in making samples and pushing production.
- Our In-House production and QC are well approved by customers.We have special QC to inspect at the beginning, middle and final stage of production to keep good quality.
-Our MOQ are 1000pcs ,but quantity range can be reach 500,000pcs, even more .(according to the quantity of order .)
Shipping Information
-Sea Shipping: Usually it will take around 20-30 days to arrive most countries. You need to make custom clearance when goods arrive your side. It is the cheapest way of shipping. So if you are not in a hurry and have big quantity of goods, you can choose sea shipping.
-Air Shipment: Usually it will take around 3-10 days to arrive most countries. You also need to make custom clearance when goods arrive your side. It is more expensive than sea shipping, but cheaper than by express.
International Express: Such as DHL, Fedex, UPS, TNT, TOLL, DPEX, USPS and so on. You can choose Economy Service which is cheaper than normal service if the goods are not urgent. It is one kind of Door to Door service. Normally if the goods volume is not very big, you don’t need to make custom clearance in your side. The courier will send the goods to your door.
Payment Term
T/T; L/C; Western Union;paypal
Thanks for your reading ! Have a nice day !
bimetal thermostat control
