Danfoss AVTA Data sheet
Data sheet
Thermo. operated water valve
AVTA
Thermo. operated water valves are used for proportional regulation of flow quantity, depending on the setting and the sensor temperature.
The Danfoss range of thermo. operated water valves includes a series of products for both refrigeration and heating regulation.
The valves are self-acting, i.e. they operate without the supply of auxiliary energy such as electricity or compressed air.
The required temperature is maintained constant without unnecessary use of:
• cooling water in cooling systems,
• hot water or steam in heating systems. The operating economy and-efficiency are maximized.
AVTA SS for aggressive media.
A valve body in stainless steel means that the valve can be used for aggressive media in such applications as the marine sector and the chemical industry.
Features |
• Insensitive to dirt |
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• Insensitive to water pressure |
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• Needs no power supply – self acting |
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• Opens on rising sensor temperature |
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• Differential pressure: 0 – 145 psi |
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• Maximum working pressure (MWP): 232 psi |
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Maximum test pressure: 365 psi |
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• Maximum pressure on sensor: 365 psi |
•Stainless steel version available
•The valves are pressure-relieved, i.e. the degree of opening is not affected by differential pressure Δp (pressure drop).
•The regulation range is defined for the point at which the valve begins to open.
•Cooling media temperature range: -13 – 266 °F
•Ethylene glycol as a cooling media up to 40%
© Danfoss | DCS (jmn) | 2016.04 |
IC.PD.500.D4.22 | 520B7244 | 1 |
Data sheet | Thermo. operated water valve, AVTA
How it works
Thermo. operated water valves consist of three main elements:
1.Setting section with knob, reference spring and setting scale.
2.Valve body with orifice, closing cone and sealing elements.
3.Hermetically sealed thermostatic element with sensor, bellows and charge.
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When the three elements have been assembled together, the valve installed and the sensor located at the point where the temperature is to be regulated, the function sequence is as follows:
1.The pressure changes in the sensor as a result of a change in temperature - builds up in the sensor.
2.This pressure is transferred to the valve via the capillary tube and bellows and acts as an opening or closing force.
3.The knob on the setting section and the spring exert a force that acts counter to the bellows.
4.When balance is created between the two opposing forces, the valve spindle remains in its position.
5.If the sensor temperature changes – or if the settings are changed – the point of balance becomes displaced and the valve spindle moves until balance is re-established, or the valve is fully open or closed.
6.The flow quantity change is approximately proportional to sensor temperature change.
The illustrations show an AVTA cooling water valve, but the function principle applies to all types of thermostatic valves.
AVTA applications |
AVTA thermo. operated water valves are widely |
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used for temperature regulation in many different |
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machines and installations where cooling is |
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required. AVTA cooling water valves always open to |
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admit flow on rising sensor temperature. |
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The valve can be installed in either the cooling |
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water flow line or the return line. |
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The standard version of the ATVA thermo. operated |
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water valve can be used with fresh water or neutral |
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brine. |
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Typical application areas: |
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yy Injection moulding machines |
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Compressors |
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Vacuum pumps |
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yy Dry cleaning machines |
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Distillation plants |
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Printing machines |
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Hydraulic systems |
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Roller mills |
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Biomass boilers |
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Industrial lasers |
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Steam sterilizers |
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Medical equipment |
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Food processing |
1.Oil tank
2.Hydraulic machinery
3.Heat exchangers
4.Cooling water supply
5.ATVA thermostatic valve
2 | 520B7244 | IC.PD.500.D4.22 |
© Danfoss | DCS (jmn) | 2016.04 |
Data sheet | Thermo. operated water valve, AVTA
Materials AVTA
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No. |
Description |
Material AVTA |
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Material AVTA SS |
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1 |
Spindle |
Brass |
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Stainless steel |
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2 |
Diaphragms |
Rubber – ethylene – propylene (EPDM). |
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3 |
Valve body and other metal parts |
Forged brass |
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Stainless steel |
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4 |
Valve seat |
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Stainless steel |
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5 |
Valve cone |
Nitrile rubber (NBR) |
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6 |
Sensor |
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Copper |
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7 |
Capillary tube gland |
Nitrile rubber (NBR) / brass |
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Charges |
ATVA thermo. operated water valves with different types of charge |
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Universal charge |
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Mass charge |
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Adsorption charge |
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© Danfoss | DCS (jmn) | 2016.04 |
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IC.PD.500.D4.22 | 520B7244 | 3 |
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Data sheet | Thermo. operated water valve, AVTA
Ordering AVTA with adsorption charge
Sensor installation |
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The charge consists of active carbon and CO2 which |
yy Wide regulating range |
is adsorbed on falling sensor temperature, thereby |
yy Can be installed in any position as far as |
producing a pressure change in the element. |
orientation and temperature are concerned |
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yy Small sensor dimensions – ø0.4 × 5.9 in |
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yy Max. pressure on sensor 365 psi |
For immersion pockets, see “Spare parts and accessories”, page 8.
Connection |
Regulating |
Max. temp. |
kv value |
Capillary |
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range |
sensor |
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tube length |
Type |
Code no.1) |
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NPT |
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[°F] |
[°F] |
US [gpm] |
[ft] |
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[in] |
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1/2 - 14 |
50 – 176 |
266 |
2.2 |
7.6 |
AVTA 15 |
003N6115 |
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3/4 - 14 |
50 – 176 |
266 |
4.0 |
7.6 |
AVTA 20 |
003N7120 |
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1 - 11 1/2 |
50 – 176 |
266 |
6.4 |
7.6 |
AVTA 25 |
003N8125 |
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1) Code no. covers complete valve incl. capillary tube gland.
4 | 520B7244 | IC.PD.500.D4.22 |
© Danfoss | DCS (jmn) | 2016.04 |
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