High pressure float valve, type HFI REFRIGERATION AND AIR CONDITIONING. Technical leaflet

Transcription

1 High pressure float valve, type HFI REFRIGERAION AND AIR CONDIIONING echnical leaflet

2 Contents Page Introduction Features Design echnical data he principle of high pressure control Insert for the high pressure float valve, type Computation and selection Capacity tables - SI units Capacity tables - US units High pressure control in refrigeration system with condenser/evaporator Material specification Connections Dimensions and weights Volumes Ordering DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07

3 Introduction HFI is a high pressure float valve with internal liquid measuring device. he float valve is designed for direct flange mounting or welding on to plate heat exchanger type condensers, as illustrated in fig 1. HFI is sturdy and reliable owing to its simple design. he float valve is equipped with a purge valve for purging non condensable gases e.g. air from the top of the valve housing. his facility is also useful if the valve has to be serviced. HFI is direct acting, therefore no differential pressure is required to activate the valve. Fig. 1 Features Designed for direct flange mounting on to plate heat exchanger type condensers Can be mounted directly on vessels emperature range: /+80 C ( 58/+176 F) Equipped with purge valve for purging non condensable gasses Maximum operating pressure is 25 bar g (363 psi g) Suitable for aonia and other refrigerants with a density of 0 through 0 kg/m 3 ( lb/ft 3 ). For densities outside this range please contact your local Danfoss sales company. Housing i.e. shell and flange are made of special steel approved for low temperature application Classification: o get an updated list of certification on the products please contact your local Danfoss Sales Company. Danfoss A/S (AC-AKC / frz), DKRCI.PD.GB0.A3.02 / 5H2143 3

4 Design Available connections Flange: Inlet: Flange DN 0 or DN 1 (DIN-2635/DIN 2512-F) Outlet: Welding connection DN (EN 2) Butt-weld, DIN: Inlet: DN 0 or DN 1 (EN 2) Outlet: Welding connection DN (EN 2) Butt-weld, ANSI: Inlet: DN 0 (4 ) or DN 1 (6 ) (ANSI B 36.) Outlet: Welding connection DN (2 ) (ANSI 36.) Housing Housing i.e. shell and flange is made of special steel approved for low temperature operation. Installation Refer to installation instruction for HFI. Identification: Pressure Equipment Directive (PED) he HFI-valves are approved in accordance with the European standard specified in the Pressure Equipment Directive and are CE marked. For further details / restrictions - see Installation Instruction Nominal bore Classified for Catagory HFI valves DN 0 and 1 (4 and 6 ) Fluid group I III echnical data Refrigerants HFI as standard can be used for R 717 (aonia) and other refrigerants with a density of 0 through 0 kg/m 3 ( lb/ft 3 ). If the density of the refrigerant in question is outside this range, please contact your local Danfoss Sales Company. Flaable hydrocarbons are not recoended. For further information please contact your local Danfoss Sales Company. emperature range /+80 C ( 58/+176 F) Pressure he float valve is designed for: Maximum operating pressure: 25 bar g (363 psi g). Strength test without float ball: bar g (725 psi g). Leakage test: 25 bar g (363 psi g). Valves for higher pressure are available on request. he principle of high pressure control Introduction In installations with one application high pressure control is an effective and cost saving way of expanding liquid from the condenser to the low pressure side. High pressure refrigerant entering the condenser will start to condense, consequently condensate will accumulate at the bottom of the condenser and in the float valve. When capacity demands increase, the liquid level in the float valve will rise, which will cause the valve to open and the refrigerant to expand into the separator at the low pressure side. When the valve is closed, there will still be a small by-pass over the seat, so any remaining liquid will equalize slowly to the low pressure side, for instance during an off cycle. herefore the system will equalize automatically and the compressor can start up without excessive back pressure. he size of the bypass is predetermined and defined by geometry of the elements. It follows from the above, that almost all the refrigerant will be accumulated on the low pressure side under normal conditions. herefore under normal conditions no high pressure receiver is necessary when using the HFI for high pressure control. 4 DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07

5 Insert for the high pressure float valve Detail A Fully closed Detail B Fully open A Fig. 3 B Fig. 4 Computation and selection In R 717 plants (aonia) On the following pages you will find tables with capacities of the float valve at various operating conditions. Select a valve using the specific operating conditions. he chosen valve must have a capacity higher than the required capacity during nominal operation, as well as during plant start up. In plants using other refrigerants than aonia he capacity of the float valve can be calculated by using the values and the equation to the right. However, the density of the refrigerant must be in the range: 0 to 0 kg/m 3. Valve type Nominal capacity [kw] (R 717, /+35 C) Valve constant [K] HFI 0 FD HFI 0 FD FD For densities outside this range please contact your local Danfoss Sales Company. FD 0 Mass flow G = p = differential pressure [bar] ρ = density of liquid [kg/m 3 ] K = valve constant (from the above table) Danfoss A/S (AC-AKC / frz), DKRCI.PD.GB0.A3.02 / 5H2143 5

6 Computation and selection capacity tables - SI units HFI 0 - R 717, evaporating capacity [kw] Evaporating temperature ( C) temp. ( C) HFI 0 - R 717, evaporating capacity [kw] temp. ( C) Evaporating temperature ( C) R 717, evaporating capacity [kw] Evaporating temperature ( C) temp. ( C) R717, evaporating capacity [kw] Evaporating temperature ( C) temp. ( C) DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07

7 Computation and selection capacity tables - US units HFI 0 - R 717, evaporating capacity [R] temp. ( F) Evaporating temperature ( F) HFI 0 - R 717, evaporating capacity [R] Evaporating temperature ( F) temp. ( F) R 717, evaporating capacity [R] Evaporating temperature ( F) temp. ( F) R717, evaporating capacity [R] Evaporating temperature ( F) temp. ( F) Danfoss A/S (AC-AKC / frz), DKRCI.PD.GB0.A3.02 / 5H2143 7

8 High pressure control in refrigeration system with condenser/evaporator Fig. 5 shows a water chiller with plate heat exchanger as both condenser and evaporator. HFI is flanged directly on to the condenser. Compressor Vapor Liquid High pressure Float Valve - HFI High pressure condenser Fig. 5, Example Water chiller (evaporator) 8 DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07

9 Material specification Fig. 6 No Part Material DIN/EN ISO ASM 1 Housing: a. Shell b. Flange (shell) c. Flange (inlet) d. Branch (discharge) Steel Steel Steel Steel St 35 N, P275 NL1, EN P275 NL1, EN St 35 N/V, W6, 2604/3 W6, 2604/3 3 End cover with cylinder Steel P275 NL1, EN Set screw Stainless steel A2- A2-5 ube Steel 6 Gasket Aluminium 7 Purge valve, SNV-S 1 ) 8 Gasket Non asbestos 9 Float Ball Steel 1 ) for further information please see the datasheet for SNV-S valves. Grade 1, A333, A334 Grade 1, A333, A334 Danfoss A/S (AC-AKC / frz), DKRCI.PD.GB0.A3.02 / 5H2143 9

10 Connections DIN - Outlet Butt welding EN2 Outlet For use with valve type HFI 0 HFI 0 HFI 0 ANSI - Outlet Butt welding ANSI B 36. Outlet For use with valve type HFI 0 HFI 0 HFI 0 DIN - Inlet Butt welding EN 2 Inlet For use with valve type HFI 0 HFI 0 HFI 0 ANSI - Inlet Butt welding ANSI B 36. Inlet For use with valve type HFI 0 HFI 0 HFI 0 Inlet flange bar / DIN 2635 / DIN 2512-F* D b k d 42 d 43 F d 2 Z 0 (4 ) (6 ) *Inlet flange and DIN outlet 8 pcs. 8 pcs. DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07

11 Dimensions and weights Fig. 7 High pressure float valve without flange (Fig. 7) Valve size A 1 A 2 A 3 B C ØD F m Weight HFI kg lb HFI kg lb Specified weights are approximate values only. Fig. 8 High pressure float valve with flange (Fig. 8) Valve size A 1 A 2 A 3 B C ØD F m Weight HFI kg lb HFI kg lb Specified weights are approximate values only. Danfoss A/S (AC-AKC / frz), DKRCI.PD.GB0.A3.02 / 5H

12 Volumes Fig. 9 Internal volume (gross): m 3 (2.17 USgal) Internal volume with float ball: m 3 (1.69 USgal) Liquid volume at max. level: m 3 (1.22 USgal) Liquid volume at m level: m 3 (0.42 USgal) Ordering FD = inlet flange DIN D = Butt welding DIN A = Butt welding ANSI he table below is used to identify the valve required. Example: HFI 0 D 0 = 148G92 ype Inlet connection size Nozzle size Code numbers HFI 0 FD 0 148G32 HFI 0 FD 0 148G33 0 (4 ) DIN Flange FD G34 FD 0 148G3422 HFI 0 FD 1 148G35 FD 1 1 (6 ) DIN Flange G36 FD 1 148G3423 HFI 0 D 0 148G92 HFI 0 D 0 148G93 0 (4 ) DIN BW D G94 D 0 148G3418 HFI 0 D 1 148G95 D 1 1 (6 ) DIN BW G96 D 1 148G3419 HFI 0 A 0 148G97 HFI 0 A 0 148G98 0 (4 ) ANSI BW A G99 A 0 148G34 HFI 0 A 1 148G30 A 1 1 (6 ) ANSI BW G31 A 1 148G3421 Insert for (complete insert with float ball - without float housing) Insert for HFI 60 ( complete insert with float ball - without float housing) Insert for HFI ( complete insert with float ball - without float housing) Insert for HFI ( complete insert with float ball - without float housing) 148G G G G3661 Specials Special HFI valves with extra connections for drainage and pressure equalization are available on request. Please contact your local Danfoss sales office. 12 DKRCI.PD.GB0.A3.02 / 5H2143 Danfoss A/S (AC-AKC / frz), 12-07