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. 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 Air filtering with venting option: Type 478-4 with µm mesh size, all other filters with µm ( µm as special version) Versions pressure regulators with continuously adjustable set point range from. to 6 bar (8 to 9 psi) Types 478- to -7 (Fig. 4) pressure 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. ) pressure regulator with increased air capacity Types 478- to - (Fig., Fig. ) pressure regulators for direct attachment to various positioners Types 478-6 and -64 (Fig. ) pressure regulators for direct attachment to Type 77 and Type 7 Pneumatic Actuators Further versions Type 478-8 Manual/automatic switchover functioning as a pneumatic bypass for positioners Types 478-8 to -87 Compressed air filters Fig. : Type 478- Fig. : Type 478-64 Fig. 4: Type 478- Fig. : Type 478-4 attached onto TROVIS SAFE 7-6 Positioner, mounted on a rotary actuator Fig. : Type 478-4, body made of aluminum (left) and stainless steel (right) Associated Information Sheet T 8 Edition March 6 Data Sheet T 846 EN
Principle of operation (Fig. 6) 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 regulator contains a filter cartridge (). The condensate is drained by opening the screw plug () by half a turn. The screw plug must be in the horizontal or suspended position when the regulator is mounted. For versions with separate filter receptacle and condensate drainage, the regulator must be installed with the receptacle suspended. 7 8 4 6... pressure regulators in combination with positioners/ actuators Various adapter plates allow the supply pressure regulator to be attached to the various devices (see page and page 4). Installation To avoid the formation of excessive condensate, the supply pressure regulator is to be 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. The air connections are designed either with ¼-8 NPT or G ¼ threads, depending on the version, or G ½ or ½-4 NPT in Type 478-4. Manual/automatic switchover The positioner output is routed to the actuator over an manual/automatic switchover unit. In automatic mode, the positioner is in closed-loop operation. In manual mode, the output pressure of any supply pressure regulator is directly applied to the actuator. This creates a manual bypass of the positioner. The manual/automatic switchover unit is mounted directly onto Types 766/67 and 7/7 (Fig. 7) Positioners or on an adapter plate with hook-up to the actuator. The Type 478- or Type 478-4 Pressure Regulator can be directly mounted. All other supply pressure regulators can be connected to the manual/automatic switchover unit using piping (hook-up)... Body. Seat. Plug. Connecting bore Plate. Diaphragm Cover. Venting bore 4 Centering bushing Cap 6 Spring 7 Set point screw 8 Lock nut Filter cartridge Screw plug Fastening screw Spring washer Fig. 6: Side view and sectional drawing of Type 478 Pressure Regulator Accessories An additional filter (Fig. 8, page 4) 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. Tip: If the regulator is connected to supply networks carrying air that contains dust, oil or condensate, we recommend using SAMSOMATIC service units for compressed air treatment. See Information Sheet u T 8. Fig. 7: Type 478-8 Manual/automatic Switchover Unit for direct attachment to Types 7/7 Positioners T 846 EN
Positioners For actuator Associated supply pressure regulator Rotary actuators Accessories (4-786) required Also with Type 478-8 Fig. 8: Type 478-4xx Type 7 ÎÎPressure gauge bracket (4-) required Type 7 ( cm²) Type 77 ( cm²) with hooked-up accessories (solenoid valve, Type 79- Lock-up Valve) Also with Type 478-8 Type 7 ( cm²) Fig. 9: Type 478-xx Type 77 ( cm²) without any hooked-up accessories and without manual/automatic switchover Type 478-8 (mounting block and pressure gauge are included in the scope of positioner delivery) Fig. : Type 478-64xx Type 7 ( cm²) Type 77 ( cm²) with hooked-up accessories (solenoid valve, Type 79- Lock-up Valve) Also with Type 478-8 Type 7 ( cm²) Fig. : Type 478-xx Type 7 Type 7 Type 76x Rotary actuators also with Type 478-8 (not with Type 79-) Fig. : Type 478-4xx Type 77 4 to 7 cm² without any hooked-up accessories and without manual/automatic switchover Type 478-8 (mounting block and pressure gauge are included in the scope of positioner delivery) Fig. : Type 478-64xx Type 476 Type 476 Type 7 (except with Type 4 Valve, NPS 6) Fig. 4: Type 478-xx Version for integral attachment Type 7 -xx for Series V Valves Fig. : Type 478-6xx T 846 EN
Universal supply pressure regulators and filters Type Manual/automatic switchover Fig. 6: Type 478-8 Filter with filter receptacle for universal attachment with piping Fig. 7: Type 478-8xxx shown here: -8, -87 Accessories Rotating supplementary filter for mounting on supply pressure regulators Fig. 8: Filter for Type 478- and Types 478- to 478-6 Adjustment ranges: Set point.... 6. bar P [bar].....6 bar 6 4 Type 478-xx Pressure Regulator (measured with ¼ connection) 6 4 Type 478-4 Pressure Regulator (measured with ½ connection) Set point Adjustment ranges: P [bar].... 6. bar 4 6 7 8 9 [m n /h] Q Q 4 6 8 4 [m n /h] Fig. 9: Air output at 8 bar supply pressure 4 T 846 EN
Table : Technical data ) pressure regulator Type 478-xx Type 478-4 pressure Set point range Air consumption at 7 bar supply pressure.6 to bar (4 to 8 psi). to.6 bar ( to 4 psi) or. to 6 bar (8 to 9 psi) to bar ) ( to 8 psi). m n ³/h. m n ³/h Dependency on inlet 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 <. bar mbar with set point range. to 6 bar (8 to 9 psi) Filter cartridge mesh size µm Optionally µm µm Optionally µm Pressure gauges Indicating range to.6 bar ( to 4 psi) or to 6 bar ( to 9 psi) Connection G /8 ) Values measured for Type 478-xx with ¼ connection and for Type 478-4 with ½ connection ) Recommendation: min.. bar ( psi) above the adjusted set point Ambient temperature ranges Type 478 - - - - -4-7 -4 - -4 - -6-64 -8-8 -84-86 -87 Standard to +7 C ) to +8 C Lowtemperature 4 to +8 C to +7 C ) version to +8 C Weights Type 478 - - - - -4-7 -4 ) - -4 - -6-64 -8-8 -84-86 -87 kg (approx.).48.8.66.6...74.68.9.7.4..4.4..9.9 ) Applies also to rotating supplementary filter ) With aluminum body and polyamide filter receptacle Table : Materials pressure regulator Type 478-xx Type 478-4 Body Metal parts Aluminum ) (.47) or stainless steel (.444) Cover Cap Plastic parts Polyamide, glass fiber reinforced 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 (Grilamid TR9UV) Filter cartridge μm: polypropylene μm: stainless steel μm: polypropylene and polyethylene Pressure gauge Body Connection and measuring element ) Anodized Stainless steel Nickel-plated brass or stainless steel for copper-free version T 846 EN
6 6 Dimensions in mm Specifications in parentheses apply to additional compressed air connection (Fig. 4) Output Fig. : (photo: Fig. 8) Type 478-4xx Pressure Regulator attached to Type 7 Positioner 9 66 7 96 8 7(99) Fig. : (photo: Fig. ) Type 478- xx Pressure Regulator attached to Type 76x or 7x Positioner 7 8 6 6. Output Output 9 Fig. : (photo: Fig. ) Type 478-4xx Pressure Regulator attached to Type 76x or 7x Positioner 9 67 7 6 Fig. : (photo: Fig. 4) Type 478- xx Pressure Regulator attached to Type 476 or 476 Positioner 478-. 6 Output 7(99) 6 T 846 EN
78 Fig. 4: (photo: Fig. ) Type 478-64xx Pressure Regulator for Type 77 Pneumatic Actuator and Type 76x or 7x Positioner 6 G/8 8 6 4 6 97 4 74 4 Fig. : (photo: Fig. ) Type 478-64xx Pressure Regulator for Type 77 Pneumatic Actuator and Type 7 Positioner 6 8 6 4 6 74 4 7 Fig. 6: (photo: Fig. 9) Type 478- xx Pressure Regulator attached to Type 7 Positioner 8 9 T 846 EN 7
6 (6) 4 (4) Output Ø4 9 8 (4) 4 99 44 Output 7 (4) Ø4 4 7 (44) 84 6 (8) (6) The dimensions of the stainless steel version written in parentheses Fig. 7: (photo: Fig. 4) Types 478-xx/-xx Pressure Regulator Fig. 8: (photo: Fig. ) Type 478-4 Pressure Regulator 78 4 9 44 4 8 46 Ø8 Fig. 9: (photo: Fig. 7) Types 478-8xx/-84xx/-86xx/-87xx Filter Fig. : (photo: Fig. 8) rotatable filter receptacle 8 T 846 EN
4 8 6 6 9 478-6X G 66(9) Output/ 6 44 /Output Fig. : Types 478-xx/4xx Pressure Regulators (4) 4 9 4 8 88() Output/ 6 44 Output/ Fig. : (photo: Fig. ) Type 478-6xx Pressure Regulator for Type 7 Pneumatic Actuator Fig. : Types 478-xx/-7xx Pressure Regulators T 846 EN 9
7 6 8 46 99 4 8 6 4 Fig. 4: Intermediate plate for additional compressed air shown here: Type 478-xx Fig. : (photo: 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 Types 478-8 to -87: Mounting parts for valve attachment or DIN rails according to EN or DIN rails according to DIN EN For Types 478-, -, -4, -7, -, -: Intermediate plate for additional compressed air (G ¼ or ¼ NPT) For Type 478- and Types 478- to -64: Rotatable filter receptacle For Type 478-8: Adapter plate for freely configurable hook-up or NAMUR attachment (G ¼ or ¼ NPT) Further information: u EB 846 for Type 478-xx u EB 846- for Type 478-4 T 846 EN
Article code pressure regulator Type 478- x x x x x x x x x x Standard version Aluminum filter without filter receptacle with plastic filter receptacle with aluminum filter receptacle Stainless steel version Stainless steel filter with stainless steel filter receptacle 4 with plastic filter receptacle 4 without filter receptacle 7 Version with increased air capacity Aluminum or stainless steel body, transparent plastic filter receptacle, aluminum or stainless steel 4 6 7 4 pressure regulator with adapter plate for positioner Types 7, 766, 767 Types 7, 766, 767 4 Type 476/476 pressure regulator with adapter plate for pneumatic actuator Type 77 (4 to 7 cm²) with Type 7, 766, or 767 Positioner, Type 7 Actuator 6 Type 77 Actuator with connection block 6 4 Manual/automatic switchover Bypass for positioner 8 8 Filter without pressure gauge Aluminum body and plastic filter receptacle 8 8 Aluminum body and aluminum filter receptacle 8 4 8 Stainless steel body and plastic filter receptacle 8 6 8 Stainless steel body and stainless steel filter receptacle 8 7 8 4 T 846 EN
pressure regulator Type 478- x x x x x x x x x x Connecting thread ISO-8/ - G ¼ ¼-8 NPT ISO-8/ - G ½ 6 ½-4 NPT 7 Set point range. to 6. bar, without pressure gauge. to 6. bar, with pressure gauge completely of CrNiMo steel (device 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 steel (device free of copper) 4. to.6 bar, with pressure gauge, (nickel-plated brass connection). to 6. bar, with pressure gauge, (nickel-plated brass connection, dial in MPa and kg/cm³) 6 Without 8 No. of pressure gauges Without One pressure gauge Two pressure gauges Body material Aluminum Stainless steel Filter Without in black plastic regulator housing in transparent plastic receptacle (cannot be aligned) in aluminum receptacle (cannot be aligned) in stainless steel receptacle (cannot be aligned) 4 Temperature range to +7 C (standard) 4 to +7 C 6 4 to +7 C Application Standard Free of substances that impair paint adhesion Exhaust port with thread 4 Special version Without Filter cartridge, μm mesh width Specifications subject to change without notice SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 64 Frankfurt am Main, Germany Phone: +49 69 49- Fax: +49 69 49-7 samson@samson.de www.samson.de T 846 EN 6-4- English