What is a kv-value?
Answer: Capacity / kv - value:
– Specifies how many m3/hour (capacity) water is passing through the valve at a differential pressure at 1 bar.
– Is a result of all the different constants coming from shape of orifices, units etc. which are reduced to one new constant, the kv - value.
– Is used to calculate capacity:
– ? = density (kg / m3)
– ?P = P1 - P2
Q = k v ?P [m3 / h]
I need a spare part for my product. Do you have that?
Where can I find approvals and certificates for Danfoss products? E.g. do you have a PED certificate for KP7W?
Do Danfoss products comply with RoHS directive (Restriction of Hazardous Substances)?
Answer: Yes, all declarations of conformity, including RoHS and WEEE, can be found in our internet product catalogue. Look up the product of your interest and find the relevant document either under the Literature link or the Approvals & Certificates link.
I'm looking for a Danfoss code number and I have not found it in any catalogues?
Answer: Som code numbers are not available for all markets, or it may have been replaced by another number.
To resolve the issue, please contact your nearest Danfoss office: http://www.danfoss.com/Contact/Worldwide/
Could I send you a Danfoss part for repair?
Do you have a device that cools a heating system on rising temperature?
Which valve should I choose for an aggressive fluid?
Can you supply the Danfoss valve with the type designation WKB?
How do I remedy reduced functionality of an AVTA after placing the sensor in a immersion pocket?
Answer: To ensure thermal conductivity between the sensor and the immersion pocket wall, it is recommended to use heat-conductive compound, available as an accessory under the code number 041E0110 (5 g) or 041E0111 (800 g).
Is it possible to use AVTA for protecting bio-mass boilers?
Answer: Yes, AVTA is a great solution for biomass boilers above 100 kW, preventing overheating of the boiler. In case of smaller boilers, we recommend the purpose-designed bio-mass valve BVTS.
What does it mean that thermostatic valves are proportional and self-acting?
Answer: Proportional means that on sensor temperature change, the cooling water flow quantity change is proportional. This correlation is kept up to 85% of valve capacity. Self-acting means that thermostatic valves operate without the supply of external auxiliary energy such as electricity or compressed air. It is a very important advantage of thermostatic valves because even at breakdowns in the power supply, the valve will still function, e.g. keep cooling the application.
Is it possible to replace a copper capillary tube with a stainless steel version?
Answer: No, unfortunately elements with stainless steel capillary tube are not available, but we recommend using a thermostatic element with stainless steel armour, protecting the capillary tube's entire length.
Does an AVTA valve contain any hazardous parts or substances?
Is it necessary to dismantle AVTA valve from the application to replace the thermostatic element?
Can an AVTA valve be used with glycolic water?
Can I use an AVTA thermostatic valve to regulate air temperature?
Can you deliver your products wordwide?
Answer: Yes, we have own distribution centres across the world, working together with more than 100 distributors and agents. You can see your nearest distributor or Danfoss office here: http://www.danfoss.com/Contact/Sales_and_Services/
Do you have a complete catalogue showing all your products?
Answer: Our internet product catalogue is the most extensive information source: http://www.danfoss.com/Products/Categories/
Besides these products, Danfoss also produces customer-specific products and solutions that are not visible in the catalogue. Please contact your nearest Danfoss office to discuss your needs and how we can meet them.
Can you deliver products exclusively made for us?
Answer: Yes, we have the possibility to develop products that are unique for one customer subject to individual agreements. The products may differ in appearance, technical features or packaging. Please contact us to discuss your requirements.
Which distribution channels does Danfoss use?
Can I review your stock online?
Where can I find technical drawings of Danfoss products?
Answer: Dimension and function drawings of our products are often part of the products' technical leaflets. In our internet product catalogue (http://www.danfoss.com/Products/Categories/), find the product of your interest, then follow the Literature link to see avaliable items.
Can high differential pressure across an AVTA valve influence its functionality?
Where do I direct commercial or technical questions?
Do you have local stock?
Why is the sensor mounting position so important for AVTA with universal charge?
Where can we find your data sheets?
Answer: All relevant literature, including technical brochures, are available on our Web site: http://www.danfoss.com/BusinessAreas/IndustrialAutomation/Documentation/Industrial+Automation+Literature.htm
Do you have local websites in my language?
Is it possible to place orders online?
Does Danfoss operate globally?
Is Danfoss a German company?
Can I use an AVTA valve for heating purposes ?
Answer: AVTA is designed for cooling systems in industrial applications. However if you remove the 8 screws that fix the valve body and assemble in the reverse position, you will be able to use the valve for heating purposes, always respecting the temperature that the bulb is specified for.
For heating systems, we recommend the Danfoss valve AVTB, designed for this application and obtainable through the Danfoss Heating Division.
What is the difference between the AVTA and AVTB ?
Answer: The AVTA valve opens at rising temperature (cooling application).
The AVTB, available from Danfoss Heating Division, is the opposite of the AVTA, and is used for heating applications, so it opens when temperature is falling.
My AVTA valve's sensor with universal charge is only half immersed in the medium. How does this influence the valve's functionality?
What is off-set for thermostatic valves?
What is hysteresis of an AVTA valve?
What is the AVTA valve's reaction time on temperature changes?
Answer: Reaction time depends on two factors: Type of the charge and whether sensor is in contact with liquid media or air.
Examples of reaction time for AVTA with mass/universal charge:
3-4 seconds - sensor in water, at increasing temperature, middle range.
216 seconds - sensor in air 0.5 m/s, at increasing temperature, middle range.
156 seconds - sensor in air 1.0 m/s at increasing temperature, middle range.
For adsorption charge reaction time is longer than for other two fillings.
Which AVTA valve should I use when the ambient air has H2S, destroying the capillary tube?
What is the compatibility of AVTA body with deionized water, corrosive for metals?
Answer: Deionized water is an aggressive medium and can have bad influence on brass housing of the valve.
DI water can destroy brass material, extract metals (zinc) from brass and pollute water. Very high grade DI water will erode brass fast (around 6 months) and low quality DI will give a slow gradual attack on the brass.
We recommend using a stainless steel version of the AVTA valve.
Is there any temperature range preset made for the WVTS valve?
Can you send me a 3.1 certificate for a valve already delivered?
Answer: The inspection certificate 3.1 involves test results that shall be carried out during production process for the specific valve. For valves already produced, we are therefore not able to issue this certificate.
Therefore, when ordering, please specify the need for the certificate.
Permissible working pressure for the WVTS valve is 10 bar. What will happen if WVTS will be installed in application where pressure is maximum 16 bar?
Answer: If the pressure is higher than the allowed, it is likely that the permanent influence shortens the life period of the internal parts of the WVTS valve.
In such cases, we recommend using 2 AVTA valves in parallel connection instead of one WVTS. The AVTA can operate at 16 bar and thus be used without problems.
How do I see the production date of an AVTA valve?
The pilot unit for WVTS valve is supplied with white plastic washer - is it only packaging protection to be thrown out?
Is it necessary to install a filter ahead of thermostatic valves?
Answer: We always recommend installing a filter type FV in the pipe system ahead of valves, especially in cases when the medium could be contaminated or include dirt particles. A dirt filter should be always installed ahead of the FJVA valve, which has a small-diameter bypass in the valve body.
Are AVTA, FJVA and WVTS valves UL or CSA approved?
My WVTS 80 valve has 8 holes for flange connections, but the technical brochure shows only 4. Is the product wrong?
For thermostaticall operated valves, are there any requirements to the cooling water temperature?
Answer: The only requirement is that the cooling water temperature should be less or equal to the setting temperature.
If the cooling water temperature is close to that point, then more capacity is necessary to cool down the process medium.
We may in this case recommend a bigger valve size than in cases when the cooling water temperature is lower.
How to select proper size of the valve depending on cooling water temperature is shown in the data sheet.
My AVTA valves is noisy - why?
How does AVTA react to cooling oil as a medium?
Answer: We recommend using NBR diaphragms for oil as cooling medium. NBR diaphragms are available as accessory 003N0445, 003N0446, 003N0447 (see the technical brochure or our Internet product catalogue).
Can AVTA be used for a mixture of alcohol and water?
Answer: As we do not know exact type and composition of alcohol, we suggest forwarding above information to manufacturer of the mixture, who can assure proper functionality with NBR and EPDM seal materials.
Is it possible to order a WVTS valve with other charge than universal?
Are thermostatic valves AVTA, FJVA, WVTS normally closed or normally open valves?
The maximum sensor temperature of AVTA (Regulation range 0-30°C) is 57°C. Can the minimum sensor temperature be down to -40°C?
Where can I get the technical brochure for AVTA valves?
How do I select the right size AVTA valve?
Answer: First you must know the flow rate of water required, the regulation temperature at the sensor, and the allowable pressure differential across the valve.
With this information refer to the AVTA technical brochure for instructions and tables which will help you select the correct valve. If you do not know the water flow rate required, there is a table which will help you determine it, but you will need to know the required capacity of heat removal in refrigeration tons (TR) or in KW.
Are Danfoss AVTA valves UL listed?
What is difference between AVTA and FJVA valves?
Can the sensor element of AVTA valves be installed in any orientation?
Can an AVTA valve be installed in any orientation?
How do I set temperature on AVTA valve?
Does the Kv value correspond to the value of the flow?
Answer: Yes, the Kv value we mention in product catalogues and technical brochures gives the capacity of water with the differential pressure of 1 bar measured in cubic meter per hour :
Q=Kv*v(?P/?) unit m3/hour; ?P=differential pressure; ?=density.
Q=flow
Kv=constant
?P=in pressure - out pressure
?=? of the fluid
Where can I find some technical information about your products?
Can I get an AVTA with ATEX approval?
What do I need to know to select the right product?
Can I get quality control plans/process flowcharts/material specifications/FMEA for Danfoss products?
Can you send me literature, brochures or catalogues on your products?
I placed an order through e-commerce. Could you please check the delivery dates and inform me the earliest possible delivery?
How do I adjust the temperature on an AVTA valve?
Answer: You have to use the setting knob on the upper side of the valve. Position 1 is the minimum temperature of the specific range position, and 5 is the highest.
If you need a very accurate figure, you should check the temperature setting with a thermometer.
Can I download product approvals & certificate from the Danfoss websites?
Answer: Yes, in our internet product catalogue, all product approvals & certificates are listed. If you are unable to local a specific document, please e-mail or call us.
Can I order just the capillary tube for an AVTA?
Which media can Danfoss products be used with?
Answer: The answer depends on the materials in contact with medium for the particular product. This information can be found in the technical brochure / data sheet for the product.
We have products designed specifically to handle particular media, including drinking water, oil, air, petrol, steam and more. If in doubt, please contact your nearest Danfoss office.