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> FJVA, Thermostatic valves without sensor

Self-acting cooling water valves for flow control based on temperature changes in the return line

FJVA, Thermostatic valves without sensor

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9 Item(s)

FAQ

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.
What is off-set for thermostatic valves?
- Answer: It is the temperature on sensor that corresponds to 85% of valve opening. Above that number, the link between controlled temperature and water flow is no longer linear and temperature control is less precise.
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.
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?
- Answer: No, they are not approved as they don''t have any electrical components, and therefore an approval is not needed.
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.
Are thermostatic valves AVTA, FJVA, WVTS normally closed or normally open valves?
- Answer: Thermostatic valves valves are NC - normally closed. They open on rising application temperature.
What is difference between AVTA and FJVA valves?
- Answer: FJVA is similar to AVTA, except it operates without a remote sensor element connected by capillary tube. Instead the FJVA valve reacts to temperature of water flow through the valve body itself.