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Danfoss Thermostatic Valves

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Danfoss FJVA Thermostatically operated cooling water valves without capillary sensor

Danfoss FJVA is a self-acting, thermostatically operated valve for use in cooling applications. The valve is commonly used in connection with hydraulic stations, and is often named the "fit and forget" valve, due to its immense reliability, proven throughout decades.

Danfoss FJVA
• Danfoss self-acting cooling water valves for flow control based on temperature changes in the return line
• Bellows element acts as sensor
• Open on rising temperature
• Brass valve body
• By-pass in the valve ensures a constant minimum flow

FJVA valves are for applications where, because of installation problems, etc., it is desirable to avoid using a capillary tube. This applies mainly where regulation accuracy requirements are more moderate and where an integral bypass can be accepted.

In FJVA the whole bellows element is used as the sensor. The valve reacts to the cooling water temperature and therefore it must always be installed in the return line. Thus, indirect regulation is involved.

To ensure the medium temperature to influence the thermostatic element, when the valve is closed, a by-pass in the valve (see fig. 4) provides a constant minimal flow through the valve.

Valves of this type operate with significantly longer time constants than AVTA valves where the sensor is located at the point at which the temperature is to be regulated.
FJVA is mainly used in systems where large and sudden load changes do not occur.

Code number selection
Type          Code No.       Wt.[kg]  Reg. Range°C  Connection Kvm³/h  Media Temp.°C  Bypass 1)
FJVA15     003N8210           0.9              0 to 30           G1/2           1.9      -25 to +55             ∅2
FJVA15     003N8211           0.9          +25 to 65           G1/2           1.9      -25 to +90             ∅2
FJVA15     003N8247           0.9          +25 to 65           G1/2           1.9      -25 to +90          ∅1.5
FJVA20     003N8244           1.0              0 to 30           G3/4           3.4      -25 to +55             ∅2
FJVA20     003N8215           1.0          +25 to 65           G3/4           3.4      -25 to +90             ∅2
FJVA25     003N8245           1.1              0 to 30           G1              5.5      -25 to +55          ∅2.5
FJVA25     003N8216           1.1          +25 to 65           G1              5.5      -25 to +90          ∅2.5

Differential pressure 0  to 10 bar
1) Bypass kv: ∅ 2 mm: 0.11 m3/h
∅1.5 mm:  0.06 m3/h
∅ 2.5 mm: 0.16 m3/h

Click to View Danfoss FJVA technical  pdf


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