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Modulating liquid level regulators, servo-controlledType PMFL / PMFH and SV
REFRIGERATION AND AIR CONDITIONING Technical leaflet
� RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Contents Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Design/Function
PMFL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
PMFH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Capacity in kW
R 717 (NH3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
R �� . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Material specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1�
Dimensions and weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 3
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Introduction
For modulating liquid level control in refrigeration,freezing and air conditioning plant, a system comprising a modulating servo-controlled main expansion valve type PMFL or PMFH, controlled by a pilot float valve type SV, is used .
PMFL and SV systems are used on the evaporatorside . PMFH and SV systems are used on thecondenser side .The system is suitable for use with ammonia orfluorinated refrigerants . The PMFL and PMFH can be used in liquid lines to or from
evaporators
separators
intermediate coolers
condensers
receivers
Modulating liquid level regulation provides liquidinjection that is proportional to the actualcapacity . This gives a constant amount of flashgas, thus ensuring stable regulation andeconomic operation because variations inpressure and temperature are held to a minimum .
Technical data RefrigerantsR 717, R ��, R 134a, R 404A and other fluorinatedrefrigerants .
Max. working pressurePMFL / H: MWP = �8 barSV: MWP = �8 bar
Max. test pressurePMFL / H: Max . test pressure = 4� barSV: Max . test pressure = 4� bar
Features Applicable to all common, non-flammable refrigerants, including R 717, and non-corrosive gases/liquids - dependent on sealing material compatability
PMFL/PMFH are based on PM valve family housings
Same flange programme as for PM valve series
Valve housing in low temperature cast iron (spherical) - EN GJS 400-18-LT
Manual operation possible
Position indicator available
Pressure gauge connection to monitor inlet pressure
Simple installation
Main valve top cover can be located in any position without affecting the function
Pressure Equipment Directive (PED)The PMFL / PMFH valves are approved and CEmarked in accordance with Pressure Equipment
Directive - 97/�3/EC .For further details / restrictions - see InstallationInstruction .
* CE is only applicable to the EN GJS 400-18-LT
PMFL/PMFH-valves*
Nominal bore DN≤ �5 (1 in .) DN 3�-1�5 mm (11/4 - 5 in .) DN 150 mm (6 in .)
Classified for Fluid group I
Catagory Article 3, paragraph 3 II III
Temperature of media: –60°C to +1�0°C .
Note: Max . working pressure is limited toMWP = �1 bar when media temperatures are:below –�0°C for valves made of GGG-40 .3 andbelow –10°C for valves made of GG-�5 .
4 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Design/Function
PMFL
6 . Seal plug10 . Valve spindle1� . Valve seat19 . Valve body19a . Channel in valve body�0 . Bottom cover�3 . Main spring�4 . Servo piston�4a . Channel in servo piston30 . Top cover30a .b .c . Channels in top cover31 . Valve cone43 . Supplementary spring44 . Manometer connection53 . Spindle cap60 . Setting spindle73 . Pilot connection
When the liquid level inside the float drops, the float orifice opens . This relieves the higher pressure, ps, acting on the servo piston to the low pressure side causing the PMFL to open . Variations in liquid level will result in variations
The setting spindle, pos . 60, has not been set from factory . It is imperative that the setting spindle is adjusted before the valve is put into operation . The outer spring, pos . �3, is preset and the inner spring, pos . 43, is adjusted when
in pressure over the piston and variation in the amount of liquid injected . It is important to choose the correct spring set when designing the plant . The spring set should be selected from the table below:
turning the spindle . The following tables shows the adjustment of the inner spring in number of turns of the spindle as a function of valve size, spring type and pressure difference:
PMFL
→ To SV float
SubcoolingPressure difference over main valve
bar psi bar psi
K F 4 - 15 58 - �18 1 .� - 4 .0 17 - 58
0 - 8 0 - 14 Normal spring set Weak spring set
8 - 40 14 - 7� Strong spring set
PMFL
C/w normal (factory mounted) spring set, subcooling 0-8 K ~ 0-14 F
Pressure difference (Dp) over PMFL in bar or psi
< 5 bar 5 - 8 bar 8 - 10 bar 10 - 1� bar > 1� bar
< 7� psi 7� - 116 psi 116 - 145 psi 145 - 174 psi > 174 psi
80 No tension � - 3 3 - 4 .5 4 .5 - 6 ca . 7
1�5 No tension 3 - 5 5 - 7 7 - 9 ca . 10
�00 No tension 3 - 5 5 - 7 7 - 9 ca . 10
300 No tension 4 - 6 6 - 9 9 - 1� ca . 14
PMFL
C/w strong spring set, subcooling 8-40 K ~ 14-7� F
Pressure difference (Dp) over PMFL in bar or psi
6 - 9 bar > 9 bar
87 - 131 psi > 131 psi
80 4 Max . tension
1�5 6 Max . tension
PMFL C/w stong spring set, subcooling 8-40 K ~ 14-7� F
Pressure difference (Dp) over PMFL in bar or psi
6 - 16 bar
87 - �3� psi
�00Spring must always be set to max . tension
300
PMFL
C/w weak spring set, low pressure plants
Pressure difference (Dp) over PMFL in bar or psi
1 .� - 1 .8 bar 1 .8 - � .5 bar � .5 - 3 bar 3 - 4 bar
17 - �6 psi �6 - 36 psi 36 - 43 psi 43 - 58 psi
80 No tension 3 - 4 4 - 6 Max . tension
1�5 No tension 4 - 6 6 - 8 Max . tension
�00 No tension 4 - 6 6 - 8 Max . tension
300 No tension 5 - 7 5 - 7 Max . tension
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 5
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Design/Function(continued)
The values for spindle turns are an indication foran initial setting only . If a position indicator is used, a more precise modulation can be achieved when fine tuning the valve setting . If the PMFL is not opening fully, the spring tension must be reduced . If the PMFL is operating in a ON/OFF function, the spring tension should be increased . The condenser pressure will have an effect on the fine tuning and large variations in condensing pressure might call for readjustment .The subcooling is measured just before the PMFLand the pressure difference is for the valve onlyexcluding piping and armatures .
The PMFL can be used together with either SV 1-3or SV 4-6 as the pilot valve .
The final choice of orifice may vary depending onrefrigerant and pressure levels . Smaller pressurelevels needs a bigger orifice . Pressure differencelevels below 3 bar (43 psi) need SV 3 or SV 4-6with Ø3 mm orifice .
PMFL function example
From compressor To compressor
From evaporator
Condenser Alarm Alarmfloat switch
Through type receiver
Liquid level
Overflowvalve
Filter
Oil drain valve
To evaporatorLow pressure float system(for explanatory purposes only)
Both the SV 1-3 and SV 4-6 can be used for PMFLlow pressure control system . If SV 4-6 is used asshown above, the float must be connected asshown .
If SV 1-3 float is used, this has � different pilotconnections: S-port (series connection with thePMFL) or P-port (parallel connection with thePMFL) .
P-port:When using the P-port, it is possible to force openthe PMFL valve to a fully open position . This ispractical for service purposes or to confirm if thefloat has sufficient capacity for the PMFL and theoperating conditions . However, when P-portconnection is used it is possible to overfill a system due to constant bleeding or unauthorisedtampering . In this case, its advisable to introduce a shut off when the liquid level reaches a presetpoint . Shut off can be done via an electrical
switch if an EVM valve is mounted in the SII port in the top of the PMFL . It is only advisable to use the P-port connection at low subcooling, < 8 K (< 14 F) .
In general:
If the float system is unstable, set a larger bleed .
If the PMFL stays open when the float is closed, set a smaller bleed .
S-port:The S-port offers the advantage of a preorificewhich divides the pressure drop and any wearpossibility due to cavitation . S-port connection must be used if the subcooling is higher than 8 K (14 F) . The spindle should be opened 4 turns initially before adjustment . Adjustment should be done in steps of ¼ turn until the PMFL has a modulating function . The kv (Cv) value of the SV is higher using S-port than using
SV floats for PMFL
The orifices determines the kv (Cv) value of the pilot and the following table can be used as an initial selection guide:
PMFLSV 1-3 SV 4-6
SV 1 SV 3 Ø � .5 Ø 3 (SV 4)
80 X X
1�5 X X
�00 X X
300 X X
6 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Design/Function(Continued)
PMFH
If the liquid level inside the SV float rises, the floatorifice opens and relieves pressure through thepilot line to the top of the PMFH, increasing thepressure, ps, moving the pushrod downwards and opening the PMFH . The pilot line is connected in the topcover at SI . Override of the pilot signal can be made by using an EVM valve at SII . It is important to choose the correct spring set when designing the plant . The spring set should be selected from the table below:
PMFH
PMFH function exampleFrom low stagecompressor(s)
To high stagecompressor(s)
From high stagecompressor(s)
To low stageseparator
Condenser
Alarmfloatswitch
Intermediatepressurevessel
Liquid trapreceiver
Filter
Tocompressorcooling
High pressure float system(for explanatory purposes only)
Alarm
3 . Manometer connection6 . Seal plug10 . Valve spindle19 . Valve body19a . Channel in valve body�0 . Bottom cover�1a . Channel in servo piston�3 . Main spring�4 . Servo piston30 . Top cover30a .b .c . Channels in top cover31 . Valve cone53 . Spindle cap60 . Manual opening73 . Pilot connection
The PMFH can be used together with either SV 1or 3 whith the SV mounted with the bleed valvedownwards, refer to the drawing below . Thisreverses the opening so that rising float opens the orifice .
Pressure difference over main valve
bar psi bar psi
0 - 4 .5 0 - 65 > 4 .5 > 65
Weak spring set Normal spring set
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 7
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
SV 1-3 float has � different pilot connections: S-port (series connection with PMFH) or P-port (parallel connection with the PMFH) .
P-port:When using the P-port, it is possible to force openthe PMFH valve to a fully open position . This ispractical for service purposes or to confirm if thefloat has sufficient capacity for the PMFH and theoperating conditions . However, when P-portconnection is used it is possible to overfill a system due to constant bleeding or unautorised tampering . In this case, it is advisable to introduce a shut off when the liquid level reaches
a preset point . Shut off can be done via an electrical switch if an EVM valve is mounted in the SII port in the top of the PMFH . It is only advisable to use the P-port at low pressure difference .
S-port:The S-port offers the advantage of a preorificewhich divides the pressure drop and any wearpossibility due to cavitation . S-port connection must be used at high pressure differences, dp > 10 bar (145 psi) . The kv (Cv) value of the SV is higher using S-port than using P-port . A higher P-band can thus be obtained .
Design/Function(Continued)
SV 1-3
8 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Sizing Sizing example for PMFL
RefrigerantR 717 (NH3)
Evaporator capacityQe = 600 kW
Evaporating temperaturete = −10°C (∼ pe = � .9 bar abs .)
Condensing temperaturetc = +30°C (∼ pc = 11 .9 bar abs .)
Liquid temperature ahead of valvetl = +�0°C at max . capacity
Subcooling∆tsub = tc − tl = 30°C − �0°C = 10 KCalculations do not take into account pressureloss in pipelines .
Pressure drop across valve∆p = pc − pe = 11 .9 bar − � .9 bar = 9 bar
Correction factor for 10 K subcooling0 .98
Corrected capacity600 kW × 0 .98 = 588 kW
The corrected capacity can be found in thecapacity table . It will be seen from the table thatvalve type PMFL 80-4 should be chosen .Refering to “ordering table”, code number027F0053 can be found .For details of flanges, accessories and pilot valve,see the ordering table .
Since ∆p = 9 bar and ∆tsub = 10 K, it will beseen from the “C/w strong spring set” for PMFLthat a “STRONG” spring set must be used . Thepilot line is connected to SV at connection S . In the ordering table the code number for the spring set can be found: 027F0118 .
Sizing example for PMFH
RefrigerantR 717 (NH3)
Evaporator capacityQe = ��00 kW
Evaporating temperaturete = −10°C (∼ pe = � .9 bar abs .)
Condensing temperaturetc = +30°C (∼ 11 .9 bar abs .)
Liquid temperature ahead of valvetl = +�0°C
Subcooling∆tsub = tc − tl = 30°C − �0°C = 10 KCalculations do not take into account pressureloss in pipelines .
Pressure drop across valve∆p = pc − pe = 11 .9 bar − � .9 bar = 9 bar
Correction factor for 10 K subcooling0 .98
Corrected capacity��00 kW × 0 .98 = �156 kW
The corrected capacity can be found in thecapacity table . It will be seen from the table thatvalve type PMFH 80-7 should be chosen .In the ordering table the code number for thevalve can be found: 027F3060 for CE-approvedvalve .
For details of flanges, accessories and pilotvalve, see the ordering table .
Correction factorsWhen dimensioning, multiply the evaporatorcapacity by a correction factor k dependent on
the subcooling ∆tsub just ahead of the valve .The corrected capacity can then be found in the capacity table .
R 717 (NH3)∆t K � 4 10 15 �0 �5 30 35 40 45 50
k 1 .01 1 .00 0 .98 0 .96 0 .94 0 .9� 0 .91 0 .89 0 .87 0 .86 0 .85
R 22∆t K � 4 10 15 �0 �5 30 35 40 45 50
k 1 .01 1 .00 0 .96 0 .93 0 .90 0 .87 0 .85 0 .83 0 .80 0 .78 0 .77
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 9
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Capacity in kW
Type Evaporatingtemperature te
°C
Rated capacity in kWat pressure drop across valve ∆p bar
Type Evaporatingtemperature te
°C
Rated capacity in kWat pressure drop across valve ∆p bar
0 .8 1 .� 1 .6 � .0 4 .0 8 .0 1� .0 16 .0
R 717 (NH3) R 717 (NH3)PMFL 80-1 +10
0−10−�0−30−40−50
50515354555656
606�6465666767
69717374757975
7679818�83868�
PMFL 80-1 +100
−10−�0−30−40−50
104107110111111111109
14014�14314314314�140
16116516616616516�160
176178179179177175
PMFL 80-� +100
−10−�0−30−40−50
80838586888990
97101103105106107106
1111151181191�01�0119
1�31�713013�13313�131
PMFL 80-�PMFH 80-�
+100
−10−�0−30−40−50
16717�176177177175173
��4��7��8�38��7��5���
�57�64�65�64�6��58�53
�81�84�85�84�81�77
PMFL 80-3 +100
−10−�0−30−40−50
1�7131134137139140139
154159163164167166164
17618�186188188187184
194�01�05�07�07�05�01
PMFL 80-3PMFH 80-3
+100
−10−�0−30−40−50
�64�71�76�78�76�7��67
353356357356353349343
404414416413407400393
440444445443438431
PMFL 80-4 +100
−10-�0−30−40−50
�06�14�19�����4��3�19
�50�59�64�67�67�63�57
�86�95301303301�95�88
3163�73333343303�3315
PMFL 80-4PMFH 80-4
+100
−10-�0−30−40−50
4�74384444454394�94�0
57157357�56856155�543
6516646656576476356�4
704709709704696685
PMFL 80-5 +100
−10−�0−30−40−50
3�53363443473453383�7
394406413414407396383
4494634704684584444�9
49651151851450�486470
PMFL 80-5PMFH 80-5
+100
−10−�0−30−40−50
66767968568066664963�
88788387486485�8378�3
101010�010�01000984966948
108010801080107010601040
PMFL 80-6 +100
−10−�0−30−40−50
5655845915875715465�0
68�70070569�666636608
77379�79577774671�684
851869871850816781751
P MFL 80-6PMFH 80-6
+100
−10−�0−30−40−50
11301130113011101080105010�0
1490146014301410138013601340
1670169016701640161015701540
178017801770176017301710
PMFL 80-7 +100
−10−�0−30−40−50
881909910887844794750
10601080107010309759�1875
11901�101190115010901030984
1300131013001�50119011301080
PMFL 80-7PMFH 80-7
+100
−10−�0−30−40−50
1690167016601630158015301490
���0�150�090�050�01019701940
�480�500�470�410�350�300��50
�610�610�610�590�550�510
PMFL 1�5 +100
−10−�0−30−40−50
1400145014601450140013301�60
1690173017401700163015501480
191019501950193018�017301660
�100�140�140�080199019001830
PMFL 1�5PMFH 1�5
+100
−10−�0−30−40−50
�770�770�770�7�0�650�570�490
3650357035003430337033�03�60
410041404090401039�038403770
43504350434043004�404180
PMFL �00 +100
−10−�0−30−40−50
��50�3�0�340�310���0�110�000
�710�770�780�710�590�480�340
306031�031�03030�890�750�630
336034�034103310316030�0�900
PMFL �00PMFH �00
+100
−10−�0−30−40−50
441044�0440043304�1040803960
581056805550545053605�605170
65306590651063706�4061105990
69�069�06900683067406640
PMFL 300 +100
−10−�0−30−40−50
34�0353035603500337031903030
41104�104�104100391037103540
4650474047304590437041603980
4990518051705010478045604380
PMFL 300PMFH 300
+100
−10−�0−30−40−50
6690669066606550636061705990
8810860084008�408100796078�0
988099809850965094309�409050
1050010500104001030010�0010000
PMFH 500 +100
−10−�0−30−40−50
107001070010600104001010098309540
141001370013400131001�9001�7001�400
15800159001570015400150001470014400
167001670016700165001630016000
10 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Capacity in kW (continued)
Type Evaporatingtemperature te
°C
Rated capacity in kWat pressure drop across valve ∆p bar
Type Evaporatingtemperature te
°C
Rated capacity in kWat pressure drop across valve ∆p bar
0 .8 1 .� 1 .6 � .0 4 .0 8 .0 1� .0 16 .0
R 22 R 22PMFL 80-1 +10
0−10−�0−30−40−50
111�1�1�131313
13141515151616
15161717171818
17181819191919
PMFL 80-1 +100
−10−�0−30−40−50
���3�4�5�5�5�4
�8�930303030�9
313�3�3�3�3�31
3�333434333�3�
PMFL 80-� 100
−10−�0−30−40−50
1819�0�0�1�1�1
���3�4�4�5�5�5
�5�6�7�8�8�8�8
�7�93030313131
PMFL 80-�PMFH 80-�
100
−10−�0−30−40−50
36383940404039
46474848484847
515�5�5�5�5149
5�535454535�51
PMFL 80-3 100
−10−�0−30−40−50
�930313�333434
35363739394040
39414344444544
43464748484948
PMFL 80-3PMFH 80-3
100
−10−�0−30−40−50
57606�63636�61
7�747676767573
808�8�8�817977
8�848585838179
PMFL 80-4 100
−10−�0−30−40−50
4749515�545455
57596163646464
646770717�7�71
71747778787877
PMFL 80-4PMFH 80-4
100
−10−�0−30−40−50
9498
10110�1019997
1181�11�31�31��1�0117
13013313313�1301�71�4
1331361381371341311�7
PMFL 80-5 100
−10−�0−30−40−50
74788083848484
89949699999997
10�10711011�11�110108
11�1171�11��1��1�0117
PMFL 80-5PMFH 80-5
100
−10−�0−30−40−50
14715315715715615�148
184188190189187184179
�0��05�05�03199195189
�06�11�1��10�06�00194
PMFL 80-6 100
−10−�0−30−40−50
1�913514014�143141137
15616�167168167163158
177184188189186181175
194�0��06�05�0�196189
PMFL 80-6PMFH 80-6
100
−10−�0−30−40−50
�51�60�63�6��57�49�41
31031431531330830��94
3413433413353�83�031�
34535�3533483403313�1
PMFL 80-7 100
−10−�0−30−40−50
�0��11�16�18�15�09�00
�4��51�56�55�49�40�30
�73�83�86�83�75�65�54
�99308311307�98�86�75
PMFL 80-7PMFH 80-7
100
−10−�0−30−40−50
381390393389378366353
466467465461454444433
510510504495483471458
5155�45�3516503489473
PMFL 1�5 100
−10−�0−30−40−50
3�133634635�35�346335
38640�41�415410399386
43745546446445544�4�6
479498507505494478461
PMFL 1�5PMFH 1�5
100
−10−�0−30−40−50
6�06396476436�8609589
7637707717677557397�0
83784�8358�180478476�
847864865853834810785
PMFL �00 100
−10−�0−30−40−50
51553855556356155053�
61864566066365363561�
7007�874�7407�570�677
76779681080578676073�
PMFL �00PMFH �00
100
−10−�0−30−40−50
99010�0103010�01000969937
1��01�301�301��01�0011701150
13301340133013101�801�501�10
135013801380136013301�901�50
PMFL 300 100
−10−�0−30−40−50
78�819843855851833804
940980
100010109909619�5
10601110113011�01100106010�0
11701�101�301��0119011501110
PMFL 300PMFH 300
100
−10−�0−30−40−50
15001550156015501510147014�0
185018601860185018�017801730
�0�0�030�0101980193018901830
�050�080�090�060�01019501890
PMFH 500 100
−10−�0−30−40−50
�410�480�500�480�4�0�340��60
�950�970�970�950�900�840�770
3�403�503�10316030903010�930
3�70333033303�903�1031�030�0
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 11
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Material specification
No . Part Material DIN/EN ISO ASTM
� Gasket between body and flange
Non-metalNon-asbestos
3 Bolts for flange Stainless steel A�-70 A�-70 Type 308
4 Flange PM 5 - 65 Steel RSt . 37-�, 100�5 Fe360 B, 630 Grade C, A �83
6 Plug Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
10 Valve spindle Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
1� Valve seat Teflon [PTFE]
19 Valve body Low temperature cast iron (spherical)
EN-GJS-400-18-LTEN-1693
�0 Bottom cover Low temperature cast iron (spherical)
EN-GJS-400-18-LTEN-1693
�3 Spring Steel
�4 Servo piston Cast iron GG-�5 Grade �50 Class 40B
30 Cover Low temperature cast iron (spherical)
EN-GJS-400-18-LTEN-1693
31 Trottle cone Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
3� Gasket between body and bottom cover
Non-metalNon-asbestos
34 Bolts for top and bottom cover
Stainless steel A�-70 A�-70 Type 308
41 Gasket Non-metalNon-asbestos
43 Spring Steel
53 Spindle cap Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
60 Setting / manual operating spindle
Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
73 Pilot connection Steel 9SMn�81651
Type �R683/9
1�13SAE J 403
Material specification for PMFL/PMFH valves
PMFL PMFH
1� RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Rated capacity in kW (1 kW = 0.284 TR)
The rated capacity is given at evaporating temperature te = +5°C, condensing temperature tc = +3�°C and liquid temperature tl = +�8°C .
Ordering
Main valve
The code nos . stated apply to main valves typePMFL or PMFH incl . flange gaskets, flange bolts,blanking plug and pilot connection with Ø6 .5 / Ø10 mm weld nipple (3/8 in . flare connection can be supplied, code no . 027F0115) .
Weak/Strong
Spring set Special spring set for PMFL
Special spring set for PMFH
Valve type R 717 R �� R 134a R 404A R 1� R 50�
PMFL/H 80-1PMFL/H 80-�PMFL/H 80-3PMFL/H 80-4PMFL/H 80-5PMFL/H 80-6PMFL/H 80-7PMFL/H 1�5PMFL/H �00PMFL/H 300PMFL/H 500
139�09348558835
1395�080348055808350
13900
�7 .841 .870
105174�78435700
10501740�780
�� .135 .353 .188 .9133��135355�889
1333��10
3349 .78� .71�4�07330569831
1�43�0683300
17 .4�7 .841 .870
105174�78435700
10501740
3045 .�75 .�113188300470755
113018803000
Valve typeCode no.
GG �5 EN GJS 400-18-LT
PMFL 80-1 027F0050 027F3054
PMFL 80-� 027F0051 027F3055
PMFL 80-3 027F0052 027F3056
PMFL 80-4 027F0053 027F3057
PMFL 80-5 027F0054 027F3058
PMFL 80-6 027F0055 027F3059
PMFL 80-7 027F0056 027F3060
PMFL 1�5 027F0057 027F3061
PMFL �00 027F0058 027F3062
PMFL 300 027F0059 027F3063
Valve typeCode no.
GG �5 EN GJS 400-18-LT
PMFH 80-� 027F0061 027F3065
PMFH 80-3 027F0062 027F3066
PMFH 80-4 027F0063 027F3067
PMFH 80-5 027F0064 027F3068
PMFH 80-6 027F0065 027F3069
PMFH 80-7 027F0066 027F3070
PMFH 1�5 027F0067 027F3071
PMFH �00 027F0068 027F3072
PMFH 300 027F0069 027F3073
PMFH 500 027F0070 027F3074
Subcooling ∆tu
K
Pressure drop ∆p in PMFL Pilot connection
on SVPos . Type PMFL
"WEAK" "STRONG"4 → 15 bar 1 .� → 4 bar
Spring set Code no.
0-8 "STANDARD" "WEAK" P �3 + 43 80-1 → 80-71�5�00300
027F0123 027F0124 027F0125 027F0126
027F0118 027F0119 027F0120 027F0121
8-40 "STRONG" S
Pressure drop in PMFH∆p bar
Type "WEAK"
Code no.
1 → 4
PMFH 80 .1 → 7PMFH 1�5PMFH �00PMFH 300PMFH 500
027F2190027F2191027F2192027F2193027F2194
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 13
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Flanges 2)
Stainless steel: flanges, bolts for flanges and topand bottom covers, see spare parts catalogue .
Ordering(continued)
Pilot valves SV 1-3
Spare parts and accessoriesSmaller orifices for the SV 4 are availableas spare parts .− Seal kit: 027B2070
Special orifice code no. for SV 4
1) The code no . includes orifice and all necessary gaskets
Pilot valves SV 4
1) Flange for mounting without housing Code no . 0�7B�0�7 .�) Approved and CE-marked in accordance with Pressure Equipment Directive - 97/�3/EC .
The code nos . stated apply to liquid level regulators type SV 4, 5 and 6 with two 1” weld connections for balance tubes and two ½” weld joints for liquid and evaporator connections respectively .
Pilot valve kits (EVM and coil)Can be screwed on to the PMFL or PMFH insteadof the blanking plug .
Valve type Flange type Weld flanges Solder flanges
in . Code no. 1) in . Code no. 1) mm Code no. 1)
PMFL 80 /PMFH 80
1� 3/4
111/4
027N1220027N1225027N1230
7/8
11/8
027L1223027L1229
���8
027L1222027L1228
PMFL 1�5 /PMFH 1�5
�3 11/4
11/�
027N2332027N2340
13/8 027L2335 35 027L2335
PMFL �00 /PMFH �00
�4 11/�
�027N2440027N2450
15/8 027L2441 4� 027L2442
PMFL 300 /PMFH 300
�5 ��1/�
027N2550027N2565
�1/8 027L2554 54 027L2554
PMFH 500 �6 �1/�
3027N2665027N2680
�5/8 027L2666 76 027L2676
1) Code no . applies to one flange set consisting of one inlet and one outlet flange .�) Dimension sketch see spare part catalogue .
Type Connection Code no.
Float pilot valvetype SV
Balance tubeliquid / vapour
Pilot line SV 1:027B2021027B2021CE �)
SV 3:027B2023027B2023CE �)1 in .
weldØ 6 .5 / Ø 10 mm
weld 1)1) 3/8 in . flare connection can be supplied under code no . 027B2033 .�) Approved and CE-marked in accordance with Pressure Equipment Directive - 97/�3/EC .
Valve typeOrifice
diameterCode no.
Code no. without
housing1)
SV 4 Ø 3 .0 mm 027B2024 �) 027B2014 �)
Orifice diameter kv Code no .1)
Ø 1 .0 mm 0,0�6 027B2080
Ø 1 .5 mm 0,06 027B2081
Ø � .0 mm 0 .10 027B2082
Ø � .5 mm 0,16 027B2083
Ø � .8 mm 0 .�0 027B2084
Coils, 10 W a .c .
a .c .: 0�7B11��xx
where xx can be
d .c .: 0�7B11�4yy
where yy can be
�4 V, 50 Hz 16 0� (�4 V)
110 V, 60 Hz �1 09 (��0 V)
115 V, 50 Hz ��
��0 V, 50 Hz 31
��0 V, 50/60 Hz 3�
�40 V, 50 Hz 33
14 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Optional accessories
Fundtion indicator
Ordering(continued)
Electronic position indicator, type AKS 45
AKS 45-26
a/flats 3�
Calibration/LED
AKS 45 is an electronic transmitter that provides astandard 4 - �0 mA output signal in accordancewith the opening degree of a PMFL/PMFH valve,and digital signals for fully open/closed valve .
AKS 45 is designed on the induction/eddy currentprinciple . This means that the measuring circuit isnot in physical contact with mineral oils and diverse refrigerants .
Accessories L L1 L� H H1 B B1
Electronic position indicator, type AKS 45
AKS 45 - �6mm �8 45 48 1� 78
NV 3� M �4 × 1 .5in . 1 .10 1 .77 1 .89 0 .47 3 .07
Electronic position indicator Code no.
Type AKS 45 - �6 084H4045
Description Code no.
Pressure gauge connectionØ 6 .5 / Ø 10 mm weld / solder
027B2035
Pressure gauge connection1/4 in . flare (self-closing)(Must not be used in ammonia plant)
027B2041
Pressure gauge connectionCutting ring connection
6 mm10 mm
027B2063027B2064
Pressure gauge connection 1/4 NPT 027B2062
Damping cylinder for PMFH 80 → 500 027F2195
Description Code no.
Function indicatorCan be fitted in place of the main valve bottom plug . When the protective cap of the indicator isremoved, the degree of opening of the PMFL-regulator can be observed in relation to the degree ofopening of the SV pilot valve .Note: The function indicator must be considered as a very important tool for the accurate adjustment of the spring pressure .
027F0085
Manual operating unit for PMFL . Can be fitted in place of the regulator bottom plug 027F01283/8 in . flare pilot connection for PMFL and PMFH 027F01153/8 in . flare pilot connection for SV 027B2033
Danfoss A/S (RC-CMS/MWA), 10 - �004 RD�CB40� 15
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
Dimensions and weights
PMFL/PMFH
Type
H1
mmH�
mmH3
mmH4
mmH5
mmL
mmL1
mm
L5 max .
B1
mmB�
mmB3
mm
Weight excl . solenoid valve
kg10 Wmm
�0 Wmm
PMFL PMFH
80 66 16� 79 113 176 177 106 130 140 75 87 7 .0
1�5 7� 178 96 1�8 193 �40 170 130 140 84 8� 94 11 .3
�00 79 187 105 138 �0� �54 170 130 140 94 89 10� 14 .�
300 95 �05 1�3 155 ��0 �88 �00 130 140 104 106 113 19 .8
PMFH 500 109 ��7 146 176 �4� 34� �50 130 140 1�7 113 135 �8 .3
16 RD�CB40� Danfoss A/S (RC-CMS/MWA), 10 - �004
Technical leaflet Modulating liquid level regulators, servo-controlled, type PMFL / PMFH and SV
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