Data sheet AVTB-RA, Reverse Acting
Thermostatic Water Valve
Applications:
AVTB-RA is a reverse acting thermostatic
temperature controller used to regulate
the water temperature where cooling is
required. As the water temperature rises the
thermostatic controller opens.
Typical applications could involve:
• Injection molding machines
• Compressors
• Vacuum pumps
• Dry cleaning machines
The thermostatic controller is a three part
assembly consisting of the valve body, the
thermostatic element and an adjustment
assembly.
Features:
• For water
• Self-acting
• Opens on rising temperature
• Can be tted in the supply or return
• Pressure range PN 16 (232 psi/16 bar)
Typical Application:
Ordering
Information:
1. Oil Tank
2. Hydraulic machinery
3. Heat exchangers
4. Cooling water supply
5. Cooling water valve AVTB-RA
Code No. Model
003N6032RA
003N6252RA 190 (90) 77-150 (20-60)
003N6272RA 255 (125) 125-190 (50-90)
003N7032RA
003N7252RA 190 (90) 70-150 (20-60)
003N7272RA 255 (125) 125-190 (50-90)
003N8032RA
003N8252RA 190 (90) 70-150 (20-60)
003N8272RA 255 (125) 125-190 (50-90)
AVTB-RA 15 1/2"
AVTB-RA 20 3/4"
AVTB-RA 25 1"
Connection
(FNPT)
Capillary
Tube Length
6’ 6”
(2.0 m)
Max. Sensor
Temperature
°F (°C)
130 (55)
130 (55)
130 (55)
C
2.2
4.0
6.4
v
Temperature
Range
°F (°C)
32-85 (0-30)
32-86 (0-30)
32-86 (0-30)
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Data sheet
AVTB-RA, Reverse Acting
Thermostatic Water Valve
Ordering
Information
(Cont.):
Design:
1. Handle for temperature
setting
2. Spring housing
3. Setting spring
4. O-ring
5. Diaphragm
6. Spindle
7. Valve body
8. Valve cone
9. Bellows
10. Bellows stop
11. Pressure stem
12. Tem per at ure s en sor
13. Capillary tube gland
Accessories
Code No. Components
003N0056 Capillary tube gland, 3/4” NPT
003N0418 Gasket for capillary tube gland
AVTBWELL Sensor pocket, 3/4” NPT, brass
003N0053
1.
Include gasket for capillary tube gland
Sensor pocket, 3/4” NPT,
stainless steel
Spare Parts
Code No. Components
003N0075
003N0078
003N0062
Thermostatic element
32-85°F (0-30°C)
Thermostatic element
77-150°F (20-60°C)
Thermostatic element
125-190°F (50-90°C)
Cap. tube
length ft (m)
6’6
(2)
003N4006 For 1/2” Repair set: Two diaphragms,
003N4007 For 3/4”
003N4008 For 1”
two O-rings, one rubber cone,
one tube of grease and eight
valve cover crews
003N6100 1/2”
003N7100 3/4”
Brass AVT body and
adjustment knob, less element
003N8100 1”
003N0520 AVT spare handle
Materials, parts in contact with water:
Valve body:
Other metal parts:
Diaphragms:
Ms 58, hot-pressed
Ms 58
EPDM rubber
(alt. NBR rubber
for mineral oils)
Capillary tube gland:
Valve cone:
Valve seat:
Sensor:
Sensor pocket:
NBR rubber
NBR rubber
CR Ni steel
Cu
Ms 63
Speci cations:
Sizing:
Example
Cooling water valve for temperature regulation of a vacuum pump.
Regulation of the oil temperature is required. The sensor to be placed
horizontally.
Given
• Necessary cooling e ect at full load, 34,000 BTU/h
• Required oil temperature: 113°F (45°C)
• Cooling water pressure P
• Outlet pressure P3= 0 psi (0 bar)
• Cooling water temperature T1= 77°F (25°C)
• Oulet temperature T2= 84°F (29°C), (T= 7°F (4°C))
Supply temperature range:
Maximum working pressure:
Maximum di erential pressure:
Maximum test pressure:
= 28.5 psi (2 bar)
1
-13°F to 266°F (-25°C to 130°C)
232 psi (16 bar)
100 psi (7 bar)
365 psi (25 bar)
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AVTB-RA
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Data sheet
Sizing:
AVTB-RA, Reverse Acting
Thermostatic Water Valve
AVTB-RA 25
1. By means of the curves for heating or cooling with water the necessary amount of cooling
water is detected to be 8.8 gpm at ΔT= 7°F (84-77 = 7°F)
AVTB-RA 20
AVTB-RA 15
3. By means of the bar chart the AVTB-RA
20 is the appropriate valve size for the
application.
Temperature range: 77 to 150°F. Code no.
003N7252RA will meet the requirements
Due to the mounting conditions a sensor
pocket is required. The ¾” brass sensor
pocket, code no. AVTBWELL is selected.
2. In order to obtain an eective regulation, the pressure drop across the valve should be half
the entire pressure drop: 28psi (2bar) / 2= 14.22psi (1 bar). By means of the curves for the
water amount and pressure drop the necessary Cv value is detected to be 2.3 US gpm.
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Data sheet
AVTB-RA, Reverse Acting
Thermostatic Water Valve
Setting:
Installation:
Dimensions:
Relation between scale numbers 1-5 and the closing temperature. The values given are approximate.
Scale setting 1 2 3 4 5
C losing temperature
(0 … 30 °C) 0 3 15 23 30 °C
(20 … 60 °C) 20 35 50 60 70
(30 … 100 °C) 30 35 55 75 95 120
(32...85°F) 32 39 60 73 85 °F
(77...150°F) 77 95 122 140 158
(125...190°F) 125 150 176 194 210
The valve can normally be tted in the supply
or return, in any position, provided the ow is
always in the direction indicated by the arrow.
Elements with a small sensor Ø 0.4” (9.5 mm)
(“sensor warmer”) must always have the valve
housing tted in the return.
Sensor:
0.71” x 8.26”
( 18 × 210 mm)
1)
The sensor can be m ounted where the system temp erature is
either warmer o r colder than the temperatu re in the valve body
H
Typ e
AVTB-RA 15 8.54 (217) 5.24 (133) 2.84 (72) 0.56 (14) 5.6 (141) 5.87 (149) 2.95 (75) ½” NPT
AVTB-RA 20 8.54 (217) 5.24 (133) 3.55 (90) 0.63 (16) 6.06 (154) 6.45 (164) 3.15 (80) ¾” NPT
AVTB-RA 25 8.54 (227) 5.43 (138) 3.74 (95) 0.75 (19) 6.61 (168) 6.57 (167) 3.27 (83) 1” NPT
1
in (mm)
H
2
in (mm)Lin (mm)
L
1
in (mm)L2in (mm)L3in (mm)L4in (mm)a(int. thread)
1)
Sensor pocket
Capillary tube gland
AVTB-RA with internal thread
Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.
All trademarks in this material are property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
Danfoss
Toronto, ON
Toll Free: 866-375-HVAC (4822)
Tel.: 905-285-2050, Fax: 905-285-2055
www.na.heating.danfoss.com
4
VDBJD222 © Danfoss 12/12
Danfoss
Baltimore, MD
Toll Free: 866-375-HVAC (4822)
Tel.: 443-512-0266, Fax: 443-512-0270
www.na.heating.danfoss.com
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