Danfoss Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS Data Sheet
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REFRIGERATION AND
AIR CONDITIONING
Check valve for EVRA, EVRAT and
PM valves in liquid lines
Type NRVS
Technical leafl et
Technical leaflet
Introduction
Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
Features
Technical data
Materials
NRVS
Check valve type NRVS has no damping feature and therefore can only be used for liquid line applications. NRVS is designed to be mounted directly to PM or solenoid valves EVRA/EVRAT.
Ensures correct direction of flow
Applicable to all common non flammable refrigerants including R717 and non corrosive gases/liquids dependent on sealing material compatability.
Temperature of medium:
–50°C → +140°C
Maximum working pressure
PS = 28 bar/406 psig
Valve housing made of Stainless Steel
Gaskets are non-asbestos
NRVS mounted on PM and EVRA valve
2 RD6NA302 Danfoss A/S (RC-CMS / HBS), 04 - 2004
Technical leaflet
Capacities
Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
Location of valve in system (marked with grey)
Hot gas by-pass & defrost line
Discharge line
Dry suction line
Wet suction line
Low pressure liquid line
NRVS
Liquid line without phase change Liquid line with or without phase change
Valve combination k v
(m 3 /h)
EVRA/EVRAT 10 +
NRVS 15
1.4
EVRA/EVRAT 15 +
NRVS 15
2.2
EVRA/EVRAT 20 +
NRVS 25
4.1
Evaporating temperature
T e
–40°C
–30°C
–20°C
–10°C
Pressure
∆ p (bar)
0.25
0.30
0.40
0.50
0.15
0.25
0.30
0.40
0.50
0.15
0.25
0.30
0.40
0.50
0.15
0.25
0.30
0.40
0.50
0.15
208
228
264
295
156
201
220
254
284
172
222
243
281
314
167
215
236
273
305
161
Note: The capacities in the table must be divided by the actual circulation rate, or the evaporator capacities must be multiplied with the actual circulation rate.
Minimum opening differential pressure:
EVRA/EVRAT 10 - 20 + NRVS
EVRA/EVRAT 25 + NRVS
0.07 bar
0.11 bar
Capacities (kW) Q
0
at circulation rate 1
R717
327
359
414
463
245
316
346
399
447
270
349
382
441
493
262
338
371
428
479
254
610
669
772
863
456
589
645
745
833
504
650
713
823
920
489
631
691
798
893
473
EVRA +
NRVS 25
7.0
Solution
290 × 4 = 1160 kW
EVRAT 25 + NRVS 25: Q
0
∆ p = 0.3 bar is chosen.
= 1180 kW, at
Precise valve capacities can be calculated for various refrigerants by using the “DIRcalc™”
(Danfoss Industrial Refrigeration calculation programme).
1042
1142
1319
1475
780
1005
1102
1271
1422
960
1110
1216
1405
1570
835
1078
1180
1363
1524
808
Example
An application has the following operating conditions:
Refrigerant: .................................................................R717
Evaporating temperature: ................................... –30°C
Evaporator capacity (Q
0
): ..................................290 kW
Circulation rate: ................................................................ 4
∆ p ≤ 0.3 bar
Danfoss A/S (RC-CMS / HBS), 04 - 2004
RD6NA302 3
Technical leaflet
Capacities
(continued)
4
Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
Location of valve in system (marked with grey)
Hot gas by-pass & defrost line
Dry suction line
Discharge line
Wet suction line
Low pressure liquid line
NRVS
Liquid line without phase change Liquid line with or without phase change
Valve combination k v
(m 3 /h)
PM 15
NRVS 25
4.0
Evaporating temperature
T e
–50°C
–40°C
–30°C
–20°C
–10°C
Pressure
∆ p (bar)
0.25
0.30
0.40
0.50
0.40
0.50
0.15
0.25
0.30
0.40
0.50
0.15
0.15
0.25
0.30
0.40
0.50
0.15
0.25
0.30
0.15
0.25
0.30
0.40
0.50
Note: The capacities in the table must be divided by the actual circulation rate, or the evaporator capacities must be multiplied with the actual circulation rate.
575
629
727
812
779
871
-
595
653
753
852
-
-
635
695
803
897
-
615
675
-
653
715
825
923
Minimum opening differential pressure:
PM + NRVS will be fully open at ∆ p = 0.25 bar.
Precise valve capacities can be calculated for various refrigerants by using the “DIRcalc™”
(Danfoss Industrial Refrigeration calculation programme).
PM 20
NRVS 25
6.0
Capacities (kW) Q
0
at circulation rate 1
R717
1169
1306
-
894
979
1130
1264
-
862
944
1090
1219
-
951
1043
1204
1346
-
922
1011
-
979
1072
1238
1384
PM 25
NRVS 25
7.5
1460
1632
-
1114
1224
1412
1580
-
1075
1180
1362
1523
-
1188
1303
1506
1683
-
1152
1265
-
1224
1340
1547
1730
RD6NA302 Danfoss A/S (RC-CMS / HBS), 04 - 2004
Technical leaflet
Ordering
Check valve
Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
Flanges, gaskets and bolts 1 )
Valve type Code. no.
For valve type
NRVS 15
NRVS 25
020-2032
020-2033
EVRA/T 10, EVRA/T 15
EVRA/T 20, EVRA/T 25, PM 15, PM 20, PM 25
1) Consists of one standard and one special flange, one gasket and bolts.
2) Flange and bolts only.
Dimensions and weights
Code. no.
027N1255
027N1254
Weight 2 )
[kg]
0.7
1.1
Flange type
Connection size
3 /
4
in.
1 in.
Type
NRVS 15
NRVS 25
L mm
47.5
60.5
1 ) NRVS without flanges and bolts
B mm
78.0
96.0
Weight 1 ) kg
0.1
0.25
Danfoss A/S (RC-CMS / HBS), 04 - 2004
RD6NA302 5
Technical leaflet Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
6 RD6NA302 Danfoss A/S (RC-CMS / HBS), 04 - 2004
Technical leaflet Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
Danfoss A/S (RC-CMS / HBS), 04 - 2004
RD6NA302 7
Technical leaflet Check valve for EVRA, EVRAT and PM valves in liquid lines, type NRVS
8 RD6NA302 Danfoss A/S (RC-CMS / HBS), 04 - 2004
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