Solenoid valves Type EVR 2 g 40 NC/ NO New EVR 6 with Steel cover design

Transcription

1 MAKING MODERN LIVING POSSIBLE Technical brochure Solenoid valves EVR 2 g 40 NC/ NO New with Steel cover design EVR is a direct or servo operated solenoid valve for liquid, suction, and hot gas lines with fluorinated refrigerants. EVR valves are supplied complete or as separate components, i.e. valve body, coil and flanges, if required, can be ordered separately. Features Complete range of solenoid valves for refrigeration, freezing and air conditioning plant Supplied both normally closed (NC) and normally open (NO) with de-energized coil Wide choice of coils for a.c. and d.c. Suitable for all fluorinated refrigerants Designed for media temperatures up to 0 C MOPD up to 2 bar with 2 W coil Flare connections up to /8 in. Solder connections up to 2 /8 in. Extended ends for soldering make installation easy. It is not necessary to dismantle the valve when soldering in. EVR are also available with flange connections Approvals DnV, Det norske Veritas, Norge Pressure Equipment Directive (PED) 9/2/EC The Low Voltage Directive (LVD) /2/EC with amendments EN Polski Rejestr Statków, Polen MRS, Maritime Register of Shipping, Russia Versions with UL approval can be supplied to order. DKRCC.PD.BB0.B2.02 / 20H9

2 Technical data Refrigerants CFC, HCFC, HFC Temperature of medium C with 0 W or 2 W coil. Max. 0 C during defrosting. Ambient temperature and enclosure for coil. See Coils for solenoid valves, DKRCC.PD.BS0.A.02 Min. Opening differential pressure with standard coil p bar Max. (= MOPD) liquid 2 ) 0 W a. c. 2 W a. c. 20 W d. c. Temperature of medium C Max. working pressure PB bar k v value ) EVR EVR NO EVR EVR 0 NO EVR EVR NO (a.c.) (d.c.) NO NO ) ) ) ) The k v value is the water flow in m /h at a pressure drop across valve of bar, ρ = 000 kg/m. 2 ) MOPD for media in gas form is approx. bar greater. ) Min. diff. pressure 0.0 bar is needed to stay open. m /h Rated capacity kw Liquid Suction vapour Hot gas R22 R4a R404A/R0 R40C R22 R4a R404A/R 0 R40C R22 R4a R404A/R0 R40C EVR EVR EVR EVR Rated liquid and suction vapour capacity is based on evaporating temperature t e = -0 C, liquid temperature ahead of valve t l = C, pressure drop in valve p = bar. Rated hot gas capacity is based on condensing temperature t c = +40 C, pressure drop across valve p = bar, hot gas temperature t h = +6 C, and subcooling of refrigerant t sub = 4 K. 2 DKRCC.PD.BB0.B2.02 / 20H9

3 Ordering Complete valves Normally closed (NC) with a.c. coil ) Connection Code no. Valve body + 0 W a. c. coil with m cable Flare 2 ) Solder ODF in. mm in./mm in. mm EVR / F809 02F F202 / F80 02F F2092 EVR 0 / F809 02F222 02F22 EVR / F802 02F292 02F292 Connection Code no. Valve body + 0 W a. c. coil with terminal box Flare 2 ) Solder ODF in. mm in./mm in. mm EVR / F80 02F204 02F20 / F804 02F208 02F209 EVR 0 / F F22 02F2 EVR / F80 02F29 02F29 / F224 02F224 ) Please specify code no., voltage and frequency. Voltage and frequency can also be given in the form of an appendix number, see table "Appendix numbers". 2 ) Supplied without flare nuts. Separate flare nuts: / 4 in. or 6 mm, code no. 0L0 / 8 in. or 0 mm, code no. 0L / 2 in. or 2 mm, code no. 0L0 / 8 in. or 6 mm, code no. 0L6 ) Can only be used with DIN plug DKRCC.PD.BB0.B2.02 / 20H9

4 Ordering (continued) Components Flare and solder connections Separate valve bodies, normally closed (NC) Required coil type Connection Flare ) in. mm in./mm in. mm Code no. Valve body without coil EVR 2 a.c. / F806 02F20 02F202 EVR EVR 0 EVR a.c./d.c. a.c. d.c. / F80 02F206 02F20 / F86 02F204 02F208 / F802 02F22 02F2 / F809 02F209 02F26 / F809 02F2 02F28 / F F24 02F24 / F80 02F228 02F228 Solder ODF With manual operation / F800 2 ) 02F22 / F22 02F22 / F240 02F240 / F24 / F244 02F24 / F264 02F264 / F24 a.c. / 8 02F26 02F26 a.c./d.c. Without manual operation / 8 02F F F220 02F2206 / 8 02F220 02F2208 / 8 042H0 042H06 / 8 042H0 042H H0 042H08 / 8 042H09 042H H 042H4 2 / H 042H2 Separate valve bodies, normally open (NO) ) Required coil type Connection ) Valve bodies are supplied without flare nuts. Separate flare nuts: / 4 in. or 6 mm, code no. 0L0 / 8 in. or 0 mm, code no. 0L / 2 in. or 2 mm, code no. 0L0 / 8 in. or 6 mm, code no. 0L6 2 ) With manual operation. ) The normal range of coils can be used for the NO valves, with the exception of the double frequency versions of 0 V, 0/60 Hz and 220 V, 0/60 Hz. Coils See "Coils for solenoid valves", DKRCC.PD.BS0.A.02 Flare ) Code no. Valve body without coil ) Solder ODF in. mm in. mm in. mm / F808 02F808 02F290 02F29 EVR 0 / F F F29 02F296 EVR a.c./d.c. / F F F299 02F299 / F20 02F20 / F260 02F260 / F269 02F29 a.c. / 8 02F268 02F268 4 DKRCC.PD.BB0.B2.02 / 20H9

5 Ordering (continued) Components Flare and solder connections Separate valve bodies, normally closed (NC) EVR Require coil type Connection a.c./d.c. Code no. Valve body + gaskets +bolts; without coil and flanges Without manual operation 02F24 Without manual operation 02F224 a.c. Flanges 02F2 02F24 d.c. 02F2 02F26 Coils See "Coils for solenoid valves", RD.J.E2.02. Flange sets Valve type EVR Connection Solder Code no. Weid in. mm in. mm in. / 2 02N / L 02L6 / 4 02N20 / L2 02L22 / 4 02N220 / L22 02L222 02N22 / L229 02L228 Example EVR without manual operation, code no. 02F224 + /2 in. weld flange set, code no. 02N + coil with termfnal box, 220 V, 0 Hz, code no. 08F60 (See "Coils for solenoid valves", DKRCC.PD.BS0.A.02 Accessories Description Mounting bracket for EVR 2,, 6 and 0 Strainer FA for direct mounting Code no. 02F09 See "FA" DKRCC.PD.BB0.B2.02 / 20H9

6 Capacity Liquid capacity Q e kw Liquid capacity Q e kw at pressure drop across valve p bar EVR EVR EVR EVR R22 Liquid capacity Q e kw Capacities are based on liquid temperature t l = C ahead of valve, evaporating temperature t e = 0 C, superheat 0 K. Liquid capacity Q e kw at pressure drop across valve p bar R4a EVR EVR EVR EVR Liquid capacity Q e kw Liquid capacity Q e kw at pressure drop across valve p bar R404A/R EVR EVR EVR EVR Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. Correction factors for liquid temperature t l t l C R R4a R404A/R DKRCC.PD.BB0.B2.02 / 20H9

7 Capacity (continued) Liquid capacity Q e kw Liquid capacity Q e kw at pressure drop across valve p bar R40C EVR EVR EVR EVR Capacities are based on liquid temperature t l = C ahead of valve, evaporating temperature t e = 0 C, and superheat 0 K. Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R40C Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop p across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. Suction vapour capacity Q e EVR 0 EVR Pressure drop p bar Suction vapour capacity Q e kw at evaporating temperature t e C R Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of expansion valve. When the corrected capacity is known, the selection can be made from the table. Correction factors for liquid temperature t l t l C R DKRCC.PD.BB0.B2.02 / 20H9

8 Capacity (continued) Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop p across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. Suction vapour capacity Q e EVR 0 EVR Pressure drop across valve p bar Suction vapour capacity Q e kw EVR 0 EVR Pressure drop across valve p bar Suction vapour capacity Q e kw at evaporating temperature t e C R4a R404A/R0 Suction vapour capacity Q e kw at evaporating temperature t e C Correction factors When sizing valves, the plant capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of valve/evaporator. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R4a R404A/R DKRCC.PD.BB0.B2.02 / 20H9

9 Capacity (continued) Capacities are based on liquid temperature t l = C ahead of evaporator. The table values refer to the evaporator capacity and are given as a function of evaporating temperature t e and pressure drop p across valve. Capacities are based on dry, saturated vapour ahead of valve. During operation with superheated vapour ahead of valve, the capacities are reduced by 4% for each 0 K superheat. EVR 0 EVR Pressure drop across valve p bar Suction vapour capacity Q e kw at evaporating temperature t e C R40C Correction factors When sizing valves, the evaporator capacity must be multiplied by a correction factor depending on liquid temperature t l ahead of expansion valve. When the corrected capacity is known, the selection can be made from the table. Correction factors based on liquid temperature t l t l C R40C Hot gas defrosting With hot gas defrosting it is not normally possible to select a valve from condensing temperature t c and evaporating temperature t e. This is because the pressure in the evaporator as a rule quickly rises to a value near that of the condensing pressure. It remains at this value until the defrosting is finished. In most cases therefore, the valve will be selected from condensing temperature t c and pressure drop p across the valve, as shown in the example for heat recovery. Heat recovery The following is given: Refrigerant = R22 Evaporating temperature t e = 0 C Condensing temperature t c = + 40 C Hot gas temperature ahead of valve t h = + 8 C Heat recovery condenser yield Q h = 8 kw The capacity table for 22 with t c = + 40 C gives the the capacity for an EVR 0 as 8.9 kw, when pressure drop p is bar. The correction factor for t e = 0 C is given in the table as The correction for hot gas temperature t h = + 8 C has been calculated as 4% which corresponds to a factor of.04. Q h must be corrected with factors found: With p = bar is Q h = 8.9 x 0.94 x.04 = 8. kw. With p = bar, Q h becomes only 6. x 0.94 x.04 = 6.2 kw. An would also be able to give the required capacity, but with p at approx. bar. The is therefore too small. The EVR is so large that it is doubtful whether the necessary p of apprx. bar could be obtained. An EVR would therefore be too large. Result: An EVR 0 is the correct valve for the given conditions. DKRCC.PD.BB0.B2.02 / 20H9 9

10 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR Pressure drop across valve p bar Hot gas capacity Q h kw Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling t sub =4 K Condensing temperature t c C R Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperature t e t e C R DKRCC.PD.BB0.B2.02 / 20H9

11 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR Pressure drop across valve p bar Hot gas capacity Q h kw R4a Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling t sub =4 Kv Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperature t e t e C R4A DKRCC.PD.BB0.B2.02 / 20H9

12 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR Pressure drop across valve p bar Hot gas capacity Q h kw R404A/R0 Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling t sub =4 K Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperature t e t e C R440A/R DKRCC.PD.BB0.B2.02 / 20H9

13 Capacity (continued) An increase in hot gas temperature t h of 0 K, based on t h = t c C, reduces valve capacity approx. 2% and vice versa. A change in evaporating temperature t e changes valve capacity; see correction factor table below. Hot gas capacity Q h kw EVR 2 EVR EVR 0 EVR Pressure drop across valve p bar Hot gas capacity Q h kw R40C Evaporating temp. t e =-0 C. Hot gas temp. t h =t c C. Subcooling t sub =4 K Condensing temperature t c C Correction factors When sizing valves, the table value must be multiplied by a correction factor depending on evaporating temperature t e. Correction factors for evaporating temperature t e t e C R40C DKRCC.PD.BB0.B2.02 / 20H9

14 Capacity (continued) Hot gas capacity G h kg/s EVR 2 EVR EVR 0 EVR Hot gas temperature t h C +90 Condensing temperature t c C Hot gas capacity G h kg/s at pressure drop across valve p bar R R4a Hot gas temperature t h C Condensing temperature t c C Hot gas capacity G h kg/s at pressure drop across valve p bar EVR EVR EVR EVR An increase in hot gas temperature t h of 0 K reduces valve capacity approx. 2% and vice versa DKRCC.PD.BB0.B2.02 / 20H9

15 Capacity (continued) Hot gas capacity G h kg/s EVR 2 EVR EVR 0 EVR Hot gas temperature t h C +60 Condensing temperature t c C Hot gas capacity G h kg/s at pressure drop across valve p bar R404A/R An increase in hot gas temperature t h of 0 K reduces valve capacity approx. 2% and vice versa. EVR 2 EVR EVR 0 EVR Hot gas temperature t h C +90 Condensing temperature t c C Hot gas capacity G h kg/s at pressure drop across valve p bar R40C DKRCC.PD.BB0.B2.02 / 20H9

16 Design / Function Danfoss 2F2. EVR 2 (NC) EVR 0 (NC) EVR 0 (NO) Danfoss 2F8.6.2 Danfoss 2F Pg. (NC) and 40 (NC) 4. Coil 6. Armature 8. Valve plate / Pilot valve plate 20. Earth terminal 24. Connection for flexible steel hose 28. Gasket 29. Pilot orifice 0. O-ring. Piston ring 6. DIN plug. DIN socket (to DIN 460) 40. Protective cap/terminal box 4. Valve cover 44. O-ring 4. Valve cover gasket 49. Valve body 0. Gasket. Threaded plug. Manual operation spindle. Equalization hole 4. Main channel. Pilot channel 6. Compression spring 80. Diaphragm/Servo piston 8. Valve seat 84. Main valve plate 90. Mounting hole 6 EVR solenoid valves are designed on two different principles:. Direct operation 2. Servo operation. Direct operation EVR 2 and are direct operated. The valves open direct for full flow when the armature (6) moves up into the magnetic field of the coil. This means that the valves operate with a min. differential pressure of 0 bar. The teflon valve plate (8) is fitted direct on the armature (6). Inlet pressure acts from above on the armature and the valve plate. Thus, inlet pressure, spring force and the weight of the armature act to close the valve when the coil is currentless. 2. Servo operation 22 are servo operated with a "floating" diaphragm (80). The pilot orifice (29) of stainless steel is placed in the centre of the diaphragm. The teflon pilot valve plate (8) is fitted direct to the armature (6). When the coil is currentless, the main orifice and pilot orifice are closed. The pilot orifice and main orifice are held closed by the weight of the armature, the armature spring force and the differential pressure between inlet and outlet sides. When current is applied to the coil the armature is drawn up into the magnetic field and opens the pilot orifice. This relieves the pressure above the diaphragm, i.e. the space above the diaphragm becomes connected to the outlet side of the valve. The differential pressure between inlet and outlet sides then presses the diaphragm away from the main orifice and opens it for full flow. Therefore a certain minimum differential pressure is necessary to open the valve and keep it open. For EVR 6 22 valves this differential pressure is 0.0 bar. When current is switched off, the pilot orifice closes. Via the equalization holes () in the diaphragm, the pressure above the diaphragm then rises to the same value as the inlet pressure and the diaphragm closes the main orifice., 2 and 40 are servo operated piston valves. The valves are closed with currentless coil. The servo piston (80) with main valve plate (84) closes against the valve seat (8) by means of the differential pressure between inlet and outlet side of the valve, the force of the compression spring (6) and possibly the piston weight. When current to the coil is switched on, the pilot orifice (29) opens. This relieves the pressure on the piston spring side of the valve. The differential pressure will then open the valve. The minimum differential pressure needed for full opening of the valves is bar. EVR (NO) has the opposite function to EVR (NC), i.e. it is open with de-energised coil. EVR (NO) is available with servo operation only. DKRCC.PD.BB0.B2.02 / 20H9

17 Material specifications EVR 2 to Danfoss 2F66.0 Solenoid valves Standard No. Description Material Analysis Mat.no. W.no. DIN EN Valve body EVR 2 to 2 Brass CuZn40Pb2 CW6N EVR 2 to 6 Stainless steel X CrNi Cover EVR 0 to 22 Brass CuZn40Pb2 CW6N Cast iron EN-GJS LT EN-JS02 6 Armature tube EVR 2 to 2 Stainless steel X2 CrNi Armature tube nut Stainless steel X8 CrNiS Gasket EVR 2 to 2 Rubber Cr 6 Gasket Al. gasket Al Solder tube Copper SF-Cu CW024A Screws EVR 2 to 2 Stainless steel A Spindle for man. operat. Stainless steel X8 CrNiS Gasket Rubber Cr to 40 Solenoid valves Standard No. Description Material Analysis Mat.no. W.no. DIN EN Valve body /40 Cast Iron EN-GJS LT EN-JS Cover /40 Brass CuZn40Pb2 CW6N Armature tube /40 Stainless steel X2 CrNi Armature tube nut /40 Stainless steel X8 CrNiS Gasket /40 Rubber Cr 6 Gasket /40 Al. gasket Al Solder tube /40 Copper SF.Cu CW024A Screws /40 Stainless steel A Spindle for. man. operation /40 Stainless steel X8 CrNiS DKRCC.PD.BB0.B2.02 / 20H9

18 Dimensions and weights EVR (NC) 2 and (NO), flare connection Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0. kg NV With cable connection coil With DIN plugs coil With terminal box coil Connection Flare H H 2 H H 4 L L 2 L L 4 NV L max. 0 W 2/20 W in. mm mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR 2 / EVR EVR 0 / / / / / / EVR / B B max. Weight with coil 8 DKRCC.PD.BB0.B2.02 / 20H9

19 Dimensions and weights (continued) EVR (NC) 2 22 and 22 (NO), solder connection Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0. kg With cable connection coil With DIN plugs coil With terminal box coil Connection Solder H H 2 H H 4 L L 2 L L 4 L max. 0 W 2/20 W in. mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR 2 / EVR EVR 0 EVR / / / / / / / / / / / B B max. Weight with coil DKRCC.PD.BB0.B2.02 / 20H9 9

20 Dimensions and weights (continued) EVR (NC) 2, 2 og 40, solder connection and 40 terminal box and 40 with terminal box coil Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0. kg Coil with cable Coil with DIN plugs Connection Solder L 2 H H 2 H H 4 L cable connection Coil with L Coil with DIN connection L 4 Coil with terminal box L max. 0 W 2/20 W in. mm mm mm mm mm mm mm mm mm mm mm mm mm kg / / / / / / B B max. Weight with coil EVR (NC) and 20, flange connection Coil with cable Coil with DIN plugs Weight of coil 0 W: approx. 0. kg 2 and 20 W: approx. 0. kg With terminal box coil Weight of flange set For EVR : 0.6 kg For : 0.9 kg H H 2 H H 4 L L L 2 connection Coil with cable L Coil with DIN connection L 4 Coil with terminal box L max. B B max. 0 W 2/20 W mm mm mm mm mm mm mm mm mm mm mm mm mm kg EVR Weight with coil excl. flanges 20 DKRCC.PD.BB0.B2.02 / 20H9