Type 478 Pressure Regulator Application pressure regulator used to provide pneumatic measuring and control equipment with a constant air supply Set point ranges. to.6 bar ( to 4 psi) or. to 6 bar (8 to 9 psi) The supply pressure regulator reduces and controls the maximum pressure of bar (8 psi) in a compressed air network to the pressure adjusted at the set point adjuster. The regulators have a filter which can be vented: Type 478-4 including filter with μm All other Type 478 including filter with μm or Special version with μm Special features Air blow off and low air consumption Almost independent of upstream pressure Any mounting position (except version with filter receptacle) Suitable for pipe and panel mounting as well as for attachment to various positioners and actuators Optionally with pressure gauge with CrNiMo steel housing and brass measuring element or pressure gauge completely made of CrNiMo steel (these regulator versions are completely free of any copper alloy) Threaded ends G according to DIN ISO 8/ or with NPT tapered pipe thread Versions pressure regulators with continuously adjustable set point range from. to 6 bar (8 to 9 psi) Type 478- to -7 (Figs., ) Regulators with optional set point range from. to.6 bar ( to psi). Mounted on rails conforming with DIN EN or DIN EN with accessories or mounted using a universal bracket Type 478-4 (Fig. ) Regulators with ½ connections and increased air capacity output Type 478- to -8 (Fig. 7 onwards) Regulators for direct attachment to various positioners Type 478-6 and -6 (Figs. 9 and ) Regulators for direct attachment to Type 77 and Type 7 Pneumatic Actuators Other versions Type 478-8 (Figs. 6 and 4) Manual/automatic switchover functioning as a pneumatic bypass for positioners Type 478-8 to -87 (Fig. ) Compressed air filters Fig. Types 478-, - and - Pressure Regulator Fig. Types 478-7, -4 and - Pressure Regulator, versions with stainless steel body Fig. Type 478-4 Pressure Regulator with ½ connections Associated Information Sheet T 8 EN Edition December 7 Data Sheet T 846 EN
Principle of operation (Fig. 4) The Type 478 Pressure Regulator operates according to the force-balance principle. By turning the set point screw (7), the tension of the spring (6) is changed and the output pressure is adjusted accordingly. The set point ranges from. to.6 bar or from. to 6 bar are obtained by using two different springs. The supply pressure regulator contains a filter cartridge (). To drain the condensate, open the screw plug () by half a turn. When mounting the regulator, make sure the screw plug is in a horizontal or suspended position. For versions with separate filter receptacle and condensate drainage, the regulator must be installed with the receptacle suspended. pressure regulators combined with pneumatic or electropneumatic devices (Fig. 7 onwards) Various adapter plates allow the supply pressure regulator to be attached to the various devices. Note! If the regulator is connected to supply networks carrying air that contains dust, oil or condensate, we recommend to use SAMSOMATIC service units for compressed air treatment. 7 8 4 6..... Fig. 4 Sectional view of Type 478 Pressure Regulator Installation To avoid the formation of excessive condensate, make sure the supply pressure regulator is installed as closely as possible to the compressor or the compressed air tank. The regulator is either mounted directly in the pipeline or into the appropriate panel cut-out. In addition, it may be attached directly to the positioner or the pneumatic actuator. Depending on the version used, the air connections are fitted with either G¼or¼-8 NPT threads (G ½ or ½-8 NPT threads for Type 478-4). Manual/automatic switchover The output of a positioner is routed to the actuator over a manual/automatic switchover (Fig. 6). In automatic mode, the positioner output is used and in manual mode, the output pressure of the supply pressure regulator is routed directly to the actuator. This feature provides a manual bypass for the positioner. The manual/automatic switchover is suitable for mounting on Types 76x, 78x and 7x Positioners or for mounting on an adapter plate connected up to the actuator. Type 478- (Fig. 6) or Type 478-4 can be connected to the manual/automatic switchover. All other supply pressure regulators are connected over piping. Fig. View of diverting gasket () and adjustment knob () Accessories An additional filter (Fig. 6) can be fitted on Type 478- and Types 478- to -6. The filter housing can be rotated 6 to ensure that the filter and condensate drainage always face downwards. Legends for Figs. 4 and Body. Seat. Plug. Connecting bore Diaphragm plate. Diaphragm Cover. Venting bore 4 Centering bushing Cap 6 Spring 7 Set point screw 8 Lock nut Diverting gasket Filter cartridge Screw plug Fixing screw Spring washer Adjustment knob Fig. 6 Manual/automatic switchover with Type 478- Pressure Regulator with pressure gauges and filter receptacle T 846 EN
Summary of SAMSON positioners and actuators with associated Type 478-xx Pressure Regulator Positioner For actuator Associated supply pressure regulator Type 7 up to 7 cm² Type 77 cm² and 4 to 7 cm² with hooked-up accessories (solenoid valve, Type 79- Lock-up Valve) also with Type 478-8 or with Type 79- Fig. 7 Type 478-xx Type 7 Type 7 Type 76x Type 78x Type 7 4 and 8 cm² or rotary actuators also with Type 478-8 (not with Type 79-) Fig. 8 Type 478-4xx Type 77 4 to 7 cm² without any hooked-up accessories and without manual/automatic switchover (Type 478-8) Fig. 9 Type 478-6xx Type 76 Type 77 to cm² Fig. Type 478-7xx Type 76 Pneumatic rotary actuators Fig. Type 478-8xx Type 476 Type 476 Type 7 Fig. Type 478-xx Integral attached version Type 7 for Series Vvalves Fig. Type 478-6xx T 846 EN
Universal supply pressure regulators and filters Type Manual/automatic switchover Fig. 4 Type 478-8 Filter with filter receptacle for universal attachment with piping Fig. Type 478-8xxx Photos: -8, -87 Accessories Rotatable additional filter for mounting on supply pressure regulators Fig. 6 Filter for Type 478- and Type 478- to -6 Set point 6 Set point ranges.... 6. bar P [bar].....6 bar 4 4 6 7 8 9 [m n /h] Q Fig. 7 Air flow characteristics with 8 bar supply pressure for Type 478-xx Pressure Regulators with ¼ connection Set point Set point ranges Fig. 8 Air flow characteristics with 8 bar supply pressure for Type 478-4 Pressure Regulator with ½ connection 4 T 846 EN
Table Technical data pressure regulators Type 478-xx ¼ connections Type 478-4 ½ connections pressure bar ( psi) above the adjusted set point, however, at least.6 bar (4 psi) Minimum bar ( psi) above the adjusted set point Max. supply pressure bar (8 psi) Set point range. to.6 bar ( to 4 psi) or. to 6 bar (8 to 9 psi) Air consumption at 7 bar supply pressure. m n ³/h. m n ³/h Perm. ambient temperature to 7 C Version for low temperatures Down to C Type 478-6 only down to 4 C Dependency on input pressure <. bar/δp = bar Negligible (< mbar/4 bar) Reversing error. to.4 bar (depending on set point) mbar with set point range. to 6 bar (8 to 9 psi) Hysteresis mbar with set point range <. bar. to 6 bar (8 to 9 psi) Filter cartridge mesh size μm Optional μm μm Pressure gauge Range of reading to.6 bar ( to 4 psi) or to 6 bar ( to 9 psi) Connection G 8 Weight Regulator with ¼ connections Regulator with ½ connections Type 478 - - - - -4-7 - -4 - -7-8 -6-6 -8-84 -86-87 Approx. kg.48.8.66.6...68.9.7.47.4.4.87.4..9.9 Type 478-4.74 kg (aluminum body and polyamide filter receptacle) Table Materials Pressure regulators Type 478-xx ¼ connections Type 478-4 ½ connections Body Metal parts Aluminum (.47) or stainless steel (.444) Plastic parts Polyamide, glass fiber reinforced Cover Cap Polyamide, glass fiber reinforced Polyamide, glass fiber reinforced Plug Polyamide, glass fiber reinforced and polyoxymethylene.4 and polyoxymethylene Diaphragm Diaphragm plate NBR FVMQ for low-temperature version Polyamide, glass fiber reinforced or aluminum Set point spring.4 Filter receptacle UV-resistant polyamide (Trogamid T 4) Filter cartridge Polypropylene Polypropylene and polyethylene Pressure gauge Body Connection and measuring element Stainless steel Nickel-plated brass or stainless steel for copper-free version T 846 EN
9 6 6 G Dimensions in mm Specifications in parentheses apply to additional compressed air connection as shown in Fig. 8 6 (89) Fig. 9 (Photo in Fig. 7) Type 478-xx Pressure Regulator attached to Types 76x, 78x or 7x Positioners 7 6 6 49 9 Fig. (Photo in Fig. 8) Type 478-4xx Pressure Regulator attached to Type 76x, 78x or 7x Positioner 9 9 64 7 96 Fig. (Photo in Fig. ) Type 478-xx Pressure Regulator attached to Type 476 or Type 476 Positioner 478-. 66 (9) Input Signal (for p/p positioner) 66 Fig. (Photo in Fig. ) Type 478-7xx Pressure Regulator attached to Type 76 Positioner 7 47 99 (7) 6 T 846 EN
4 6 S Input 7 G 8 8 9 Fig. (Photo in Fig. ) Type 478-8xx Pressure Regulator attached to Type 76 Positioner 9 6 (84) 6 Fig. 4 (Photo in Fig. 9) Type 478-6xx Pressure Regulator for Type 77 Pneumatic Actuator and Types 76x, 78x or 7x Positioners 6 6 G/8 9 6 4 7 4 SAMSON Ø9 99 9, 44 99 4 4 8 88 4 4 64 6 7 8 6 Fig. (Photos in Figs. and ) Type 478-xx/-xx Pressure Regulator Fig. 6 (Photo in Fig. ) Type 478-4 Pressure Regulator with ½ connections 7 T 846 EN
4 78 6 6 44 G G 6 6 478-6X 9 (4) 9 Fig. 8 (Photos in Figs. and ) Types 478-xx/-4xx Pressure Regulator 4 78 6 44 9 () 94 78 () 9 478-. -... 6 G Fig. 7 Type 478-6xx Pressure Regulator for Type 7 Pneumatic Actuator Fig. 9 (Photos in Figs. and ) Types 478-xx/-7xx Pressure Regulator 8 T 846 EN
9 44 4 4 8 4 9 Fig. (Photo in Fig. ) Type 478-8xx/-84xx/-86xx/-87xx Filter Fig. (Photo in Fig. 6) Rotatable filter receptacle Ø8 7 6 8 46 9 4 Fig. Intermediate plate for additional compressed air connection Type 478-xx (in diagram) 8 6 4 Fig. (Photo in Fig. 6) Type 478-8 Manual/automatic Switchover with adapter plate Ordering text pressure regulator According to article code Accessories For Types 478- to -4 and -8 to -87: Mounting parts for valve attachment or DIN rails acc. to EN or DIN rails acc. to EN For Type 478- and Type 478- to -6: Rotatable filter receptacle For Type 478-8: Adapter plate for freely configurable hook-up or NAMUR attachment (G ¼ or ¼ NPT) For Types 478-, -, -4, -7, -, -, -7, -8: Intermediate plate for additional compressed air output (G ¼ or ¼ NPT) 9 T 846 EN
Article code pressure regulators Type 478- x x x x x x x x x x Aluminum/plastic body, with filter, without separate filter receptacle Aluminum/plastic body, with transparent plastic filter receptacle Aluminum body and filter receptacle Stainless steel body and filter receptacle Stainless steel/plastic body, with transparent plastic filter receptacle 4 Stainless steel/plastic body, with filter, without separate filter receptacle 7 Aluminum or stainless steel/plastic body, transparent plastic or metal filter receptacle, increased air capacity output Aluminum/plastic body, with filter, for attachment to Types 7x/76x/78x Positioners (linear actuators up to 7 cm²) Aluminum/plastic body, with filter, for attachment to Types 7x/76x/78x (rotary actuators and linear actuators with 4 cm² or larger) 4 4 Aluminum/plastic body, with filter, for attachment to Type 476x Positioner Aluminum/plastic body, with filter, for attachment to Type 76 Positioner 7 Aluminum/plastic body, with filter, for attachment to Type 76 Positioner 8 Aluminum/plastic body, with filter, for attachment to Type 7 Actuator 6 Aluminum/plastic body, with filter, as connection block (direct attachment to Type 77 Actuator, 4 to 7 cm²) 6 Manual/automatic switchover 8 Compressed air filter, aluminum body, transparent plastic filter receptacle 8 Compressed air filter, aluminum body and filter receptacle 8 4 Compressed air filter, stainless steel body, transparent plastic filter receptacle 8 6 Compressed air filter, stainless steel body and filter receptacle 8 7 Threaded connections ISO-8/ - G ¼ ¼-8 NPT ISO-8/ - G ½ 6 ½-4 NPT 7 Set point ranges. to 6. bar, without pressure gauge. to 6. bar, with pressure gauge, completely of CrNiMo (free of copper). to 6. bar, with pressure gauge, (nickel-plated brass connection). to.6 bar, without pressure gauge. to.6 bar, with pressure gauge, completely of CrNiMo (free of copper) 4. to.6 bar, with pressure gauge, (nickel-plated brass connection) None 8 6 7 4 4 8 8 8 8 8 4 T 846 EN
pressure regulators Type 478- x x x x x x x x x x Number of pressure gauges None pressure gauge pressure gauges Body material Aluminum Stainless steel Filter None in black plastic regulator body in transparent plastic receptacle (not moveable) in aluminum receptacle (not moveable) in stainless steel receptacle (not moveable) 4 Temperature range to 7 C, standard 4 to 7 C 6 to 7 C Application Standard Device compatible with paint Exhaust port with thread Special version None Filter cartridge, mesh width μm Specifications subject to change without notice. T 846 EN
SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 64 Frankfurt am Main Germany Phone: +49 69 49- Fax: +49 69 49-7 Internet: http://www.samson.de T 846 EN 8-6