Crankcase pressure regulator Type KVL

Transcription

1 Data sheet Crankcase KVL KVL crankcase are used to protect the compressor motor against overload experienced during startup after long off periods or just after defrost periods. They are installed in the line of refrigeration systems. Features Accurate, adjustable regulation Wide capacity and operating range Pulsation damping design Stainless steel bellows Compact angle design for easy installation in any position Hermetic brazed construction Available with flare and ODF solder connections : Compliant with ATEX hazard zone 2 DKRCC.PD.HH0.A6.22

2 Approvals UL LISTED, file SA7200 EAN Technical data Refrigerants Regulation range R22, R270*, R290*, R34a, R404A, R407C, R07A, R600*, R600a* * only 3 87 psig Factory setting = 29 psig working 3 MWP = 26 psig test P e = PS. = 287 psig Medium temperature range F P-band 22: 29 psi 3: 22 psi This product ( ) is approved for R600, R600a, R270, and R290 by ignition source assessment in accordance with standard EN For complete list of approved refrigerants, visit and search for individual code numbers, where refrigerants are listed as part of technical data. Ordering psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw in = 2.4 mm R22 Rated capacity ) [TR] R34a R404A/ R07 Flare connection 2 ) Solder connection Code no. R407C [in] [in] Code no L L0043 KVL L L L L0046 KVL L002 ) Rated capacity is based on: = 70 psig Suction temperature t s = 0 F Condensing temperature t c = 00 F drop across Δp = 2 psi 2 ) KVL are supplied without flare nuts. Separate flare nuts can be supplied: 2 in, code no 0L03 8 in, code no 0L67 Note: The connection dimensions chosen must not be too small, as gas velocities in excess of 30 ft / s at the inlet of the can result in flow noise. DKRCC.PD.HH0.A6.22 2

3 capacity Q e ) at condensing temperature t c = 00 F psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw KVL KVL KVL Capacity Q e [TR] at temperature t s after the [ F] [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F R22 tl [ F] R DKRCC.PD.HH0.A6.22 3

4 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL 3 KVL 3 KVL 3 Capacity Q e [TR] at temperature t s after the [ F] [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F R22 tl [ F] R DKRCC.PD.HH0.A6.22 4

5 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL KVL KVL Capacity Q e [TR] at temperature t s after the [ F] R34a [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R34a DKRCC.PD.HH0.A6.22

6 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL 3 KVL 3 KVL 3 Capacity Q e [TR] at temperature t s after the [ F] R34a [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R34a DKRCC.PD.HH0.A6.22 6

7 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL KVL KVL ps R404A/R07 Capacity Q e [TR] at temperature t s after the [ F] [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R404A/R DKRCC.PD.HH0.A6.22 7

8 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL 3 KVL 3 KVL 3 R404A/R07 Capacity Q e [TR] at temperature t s after the [ F] [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R404A/R DKRCC.PD.HH0.A6.22 8

9 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL KVL KVL Capacity Q e [TR] at temperature t s after the [ F] R407C [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R407C DKRCC.PD.HH0.A6.22 9

10 psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw capacity Q e ) at condensing temperature t c= 00 F KVL 3 KVL 3 KVL 3 Capacity Q e [TR] at temperature t s after the [ F] R407C [psi] [psi] ) The capacities are based on Liquid temperature t l = 00 F tl [ F] R407C DKRCC.PD.HH0.A6.22 0

11 Sizing For optimum performance, it is important to select a KVL valve according to system conditions and application. The following data must be used when sizing a KVL valve: Refrigerant: HCFC, HFC and HC: -22, HCFC and non-flammable HFC: -3 Evaporating capacity: Q e in [TR] Liquid temperature ahead of expansion valve: t l in [ F] Suction temperature ahead of compressor: t s in [ F] downstream : in [psig] Connection type: flare or solder Connection size [in] Valve selection Example When selecting the appropiate valve it may be necessary to convert the actual evaporator capacity using a correction factors. This is required when your system conditions are different than the table conditions. The selection is also dependant on the acceptable drop across the valve. The following example illustrates how this is done. Refrigerant: R404A Evaporating capacity: Q e = 0.7 TR Liquid temperature ahead of expansion valve: t l = 20 F Compressor temperature: t s = -20 F temperature after the : = 30 psig Connection type: solder Connection size: 8 in Step Determine the correction factor for liquid temperature tl ahead of the expansion valve. From the correction factors table (see below) a liquid temperature of 20 F, R404A corresponds to a factor of.24. psi = 0.07 bar 9 (t F - 32) = t 2 C TR = 3. kw tl [ F] R R34a R404A/R R407C Step 2 Corrected evaporator capacity is Q e = = 0.87 TR Step 3 Now select the appropriate capacity table and choose the column for a temperature t s = -20 F. Using the corrected evaporator capacity, select a valve that provides an equivalent or greater capacity at an acceptable drop., KVL, delivers an evaporator capacity up to 0.9 TR at a maximum of 30 psig and a 4 psi drop across the valve. Based on the required connection size of 8 in ODF, the KVL is the proper selection for this example. Step 4 KVL, 8 in solder connection: code no 034L0049 DKRCC.PD.HH0.A6.22

12 Design / Function. Protective cap 2. Gasket 3. Setting screw 4. Main spring. Valve body 6. Equalization bellows 7. Valve plate 8. Valve seat 9. Damping device KVL Crankcase type KVL opens on a fall in on the outlet side, i.e. when the falls below the set value. KVL regulates on outlet only. variations on the inlet side of the do not affect the degree of opening as the valve is equipped with equalization bellows (6). The bellows has an effective area corresponding to that of the valve seat neutralizing any affect to the setting. The is also equipped with a damping device (9) providing protection against pulsations which can normally arise in a refrigeration system. The damping device helps to ensure long life for the without impairing regulation accuracy. P-band and Offset Example with 8 psig setting Capacity Set point psi = 0.07 bar 9 (t F - 32) = t 2 C Min. setting point Offset Max. setting point P-band Adjustment range [psig] Proportional band The p-band is defined as the difference between the at which the valve plate starts to open (set point) and the at which the valve is completely open. Example If the valve is set to open at 8 psig and the valve p-band is 29 psig, the valve will give maximum capacity when the outlet reaches 29 psig. Offset The offset is defined as the difference between the at which the valve plate starts to open (set point) and the at which the valve reaches the necessary opening for the actual load. The offset is always a part of the p-band. Because optimal function of a refrigeration plant is best reached with fully open KVL, the term offset is normally not used in connection with the KVL valve. DKRCC.PD.HH0.A6.22 2

13 Dimensions and weights in = 2.4 mm lb = 0.44 kg Connection Flare Solder ODF H H2 B C solder ød Net weight [in] [in] [in] [in] [in] [in] [in] [lbs] KVL KVL Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary eady agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved. DKRCC.PD.HH0.A6.22 3