Model 42H Nullmatic Pressure Regulator, High
Contents
1. Approximately 1 of set pressure with standard range spring Approximately 0 1 of set pressure with optional isothermal range spring bor a 50 F temperature change isothermal range spring option discontinued SD42H INSTALLATION The Regulator may be pipe mounted bracket mounted or flush panel mounted Refer to Figures 1 2 and 3 for installation dimensions and connections The direction of air flow from supply to output is indicated by an arrow on the bottom forging The Regulator may be mounted in any position in a reasonably vibration free location CAUTION Exceeding the ambient air temperature limits can adversely affect performance and may cause damage 1 Er a G d L CA 1 4 N P T AIR LOADING e j CONNECTION OPTIONAL it 7 x x lt 2 o ST a A f SS 1 4 N FP T GAUGE OPTIONAL wi CONNECTION 5 A i be 2 3 8 EI VENT MAX 3 16 AiR LOADED ae HOLES t i RK 1 7 8 c MAX 1 8 ALL OTHERS ee 1 2 N PLT Ka e OUTPUT REN ta i CONNECTION ane d E e VU e vele OPTIONAL 3 3 4 1 32 f G GAUGE AND 3 3 4 JL DIA HOLE FITTINGS W2N P T SUPPLY J22 _ THRU PANEL CONNECTION iT wl 0 25 32 1 64 DIA HOLE lt THRU PANEL p lt m 0 N ADU 1 8 FOR 100 REGULATORS ALL DIMENSIONS IN INCHES 1 171322 l ALL DIMENSIONS IN INCHES 1 8 N P T EXHAUST CONNECTION OPTIONAL Figure 1 Dimensions and2. PI portion of the Siemens public Internet site Once at the site click Support in the right column and then Product Support Next select the type of support desired sales technical see the table below documentation or software SD42H Online Support Request http www siemens com automation support request Technical Support 1 800 333 7421 8 a m to 4 45 p m eastern time Monday through Friday except holidays Customer Service amp Returns 1 800 365 8766 warranty and non warranty Public Internet Site http www usa siemens com p1 Technical Publications Click the above link to go to the Siemens Internet site and then click Process in PDF Instrumentation In the column to the right click Support gt Manuals In the column to the left select the product line e g Pressure or Temperature or Controllers to open navigation and search panes Note Navigation may change as the site evolves Warranty The sales contract contains the entire obligation of Siemens The warranty contained in the contract between the parties is the sole warranty of Siemens Any statements continued herein do not create new warranties or modify the existing warranty All product designations may be trademarks or product names of Siemens Industry Inc or other supplier companies whose use by third parties for their own purposes could violate the rights of the owners Siemens Industry Inc assumes no liability for errors or omissions in this doc
3. parts of the desired model that are different from the existing model Order these parts from Siemens see the Customer Product Support section below Refer to Disassembly and Assembly sections and substitute new parts SCH ON a Be e A Document this change on drawings records etc Options and Modifications The following are standard options and modifications available for all Model 42H regulators except where noted Air Loading To provide for supplementary air loading 100 psig maximum in addition to normal spring loading include A in the model number Consult factory See page 1 SD42H Tapped Exhaust To provide for piping exhaust flow away from the regulator include E in the model number Consult factory See page 1 Safety Release Valve Increases exhaust flow capacity when the regulator must exhaust large flows standard on Models 42H 30 and 42H 50 Not available for other ranges To delete the safety release valve include X in the model number Consult factory Pressure Gauge For direct reading of regulated pressure specify fittings if required see Figure 2 Consult factory Customer Product Support This section provides the Siemens public Internet site address e mail address telephone numbers and related information for customers to access Siemens product support When contacting Siemens for support e Please have complete product information at hand e For hardware this information is provide
4. 11 3827 7 572 36 2155 22 2155 23 1447 24 2155 62 572 51 1447 11 4952 3 7025 43 6194 13 1912 25 1912 53 7025 70 7025 58 7025 59 1912 59 1033 22 10792 10 2938 154 111 20 4952 50 2155 71 Recommended On Hand Spare Parts Always Specify Range Serial No or Other Nameplate information When Ordering Spare Parts Description Adj Screw amp Knob Assy Adj Screw amp Knob Assy Locknut Optional Mounting Nut Locknut Optional Not Shown Bushing Bushing Top Casting Top Casting Top Casting 42HE100 only Spring 30 psi Spring 50 psi Spring 100 psi Spring Seat Assy Safety Release Valve 42H30 amp 42H50 only Stripper Plate 42H30 amp 42H50 only Nozzle Seat Assy Center Casting amp Nozzle Assy Exhaust Ring Exhaust Ring Diff Spring 30 amp 50 psi Diff Spring 100 psi only Valve Plunger Assy Incl Items 24 to 29 Bottom Forging Bottom Forging Retaining Nut Cleaning Wire Restriction Screw incl Item 18 amp 19 ve 7 ae Ring Screen Stop Bushing 100 psi only Top Diaphragm Assy 42H30 A 42H50 only _ i i i et a ee mmh at wb DEER EECHER wh zb ab sch 42HE ch sch ai d 42HAE sf ail a zb ans wh wb seh sch 12 21b 1977 4 22 2938 1 23 118 36 24 7025 10 25 7025 50 26 7025 17 27 1912 60 28 2938 5 29 67743 30 1912 7 e 31 7025 39 32 4952 24 33 7025 56 34 19
5. 12 58 35 1912 61 Code Hardware CKK Description Top Diaphragm Assy 42H 100 amp All 42HA 42HE amp 42HAE O Ring Washer 100 psi only Valve Plunger Valve Spring Cup Retainer Spacer cy Ring Retaining Ring Diaphragm Exhaust Diaphragm Assy Bottom Ring Assy Incl Items 11a 30 amp 31 Wf Ring Screen Spring 1 44 20 x 3 4 Lg Fill Hd Screw 42H30 42H50 42HE30 amp 42HE50 only CKN 1 4 20 x 1 Lg Fill Hd Screw All 30 amp 50 psi Models FKK 1 4 20 x 3 4 Lg Soc Hd Screw 42H100 amp 42HE100 Only FKN 1 44 20 x 1 Lg Soc Hd Screw All 100 psi Models HFE 4 40 X 3 8 Lg Pan Hd Screw Type F WCW 1 4 Lockwasher WHW 6 Flatwasher 42H100 amp All 42HE amp 42HAE Models wb d NER oe e Q sch sch i wb GO h ot ot sch 14 14 ET wh i sch NEN o e o 42HAE ek eth se ot ot OE h sch sch d ot
6. ATED BRASS NYLON and STAINLESS STEEL The requirements for a quality instrument air supply can be found in the Instrument Society of America s Quality Standard for Instrument Air ISA S7 3 Basically this standard calls for the following Particle Size The maximum particle size in the air stream at the instrument should be no larger than 3 microns Dew Point The dew point at line pressure should be at least 10 C 18 F below the minimum temperature to which any part of the instrument air system is exposed at any season of the year Under no circumstances should the dew point at line pressure exceed 2 C 35 6 F Oil Content The maximum total oil or hydrocarbon content exclusive of non condensables should not exceed 1 ppm under normal operating conditions PRINCIPLE OF OPERATION The adjustment screw is used to load the range spring which sets the regulated pressure see Figure 4 Clockwise adjustment of the adjustment screw decreases the nozzle clearance and increases the pilot pressure The source for pilot pressure is supply air which flows through the restriction screw into the pilot pressure chamber An increase in pilot pressure forces the exhaust diaphragm assembly downward closes the exhaust port and moves the valve plunger to open the supply port This increases the output pressure which feeds back via the rebalance passage to the top diaphragm assembly When the upward force of the output pressure acting on the bo
7. Connections Figure 2 Panel Mounted Regulator er five gt Bai 2 15 16 D d f WA Coie t W be Suz SI 5 1 2 i JA 2 3 8 ga APPROX 2 9 32 DIA MOUNTING H HOLES a KEE Y Figure 3 Pipe or Bracket Mounted Regulator ALL DIMENSIONS IN INCHES SD42H Pneumatic Connections Supply and output connections are 1 2 NPT the optional air loading connection is 1 4 NPT and the optional tapped exhaust is 1 8 NPT Recommended piping to the regulator is 1 4 O D tubing although any scale free piping may be used 1 Blow out all piping before any connections are made to prevent dirt or chips from entering the regulator 2 Use pipe sealant sparingly and then only on the male threads A non hardening sealant is strongly recommended 3 Connect the regulator to a source of clean dry oil free instrument air See Instrument Air Requirements CAUTION Pressure to the supply or output connection in excess of the maximum value listed in General Specifications may cause damage Air loading pressure in excess of 100 psi may cause damage in air loaded models See the inset on page 4 for a description of Nullmatic operation HA FE i i ae is g g le Is je Ig 0 50 100 200 300 400 Li O w m Q gt x Ww OH u Pr O S Z ui uj CG a gt OI Gi O u u z T O e z w O Me lt q D 5 z T D UI z D CO O x E SUPPLY PRESSURE PSIG SUPPLY PRES
8. SURE PSIG The curves above show the minimum supply pressure required for a desired flow Graph 1 Maximum Air Flow SCFM Delivered Graph 2 Air Consumption Instrument Air Requirements Connect the regulator to a source of clean dry oil free instrument air Failure to do so will increase the possibility of a malfunction or deviation from specified performance CAUTION A Use of process fluids other than instrument air is not recommended No claim is made as to the suitability of this product for use with other process fluids such as hazardous gases except as listed on the appropriate certificate Non approved instruments are suitable for use with instrument air only Optional features and modifications such as tapped exhaust do not imply suitability for use with hazardous gases except as listed on the approval certificate CAUTION Synthetic compressor lubricants in the air stream at the regulator may cause the regulator to fail SD42H There are many types of synthetic lubricants Some may not be compatible with the materials used in construction of the regulator Wetting of these materials by such an oil mist or vapor etc may cause them to deteriorate This may ultimately result in failure of the regulator The following materials are in contact with instrument air ALUMINUM ANODIZED ALUMINUM BRASS BUNA N CADMIUM PLATED C R S CHROMED NICKEL PLATED BRASS FAIRPRENE MONEL NEOPRENE NITRILE COATED POLYESTER FABRIC NICKEL PL
9. Siemens Industry Inc INSTALLATION AND SERVICE INSTRUCTION SD42H Rev 9 October 2012 Supersedes Rev 8 Model 42H Nullmatic Pressure Regulator High Capacity INTRODUCTION The Model Series 42H Nullmatic Pressure Regulator high capacity shown below is used typically to control air pressure in pneumatic instrument circuits test stands production checking fixtures etc It uses a two stage pilot operated null balance principle of operation which maintains the output pressure despite wide changes in output flow or supply pressure This instruction has five major sections Introduction Installation Principle of Operation Maintenance and Parts List Model Designation Model Series 42H A 50 42H Options A Air Loaded E Tapped Exhaust no letter Standard Range 30 1 to 30 psi 50 1 to 50 psi 100 1 5 to 100 psi General Specifications UY Eed See Table below Model No Recommended psi Maximum psi 42H 30 Note Performance will be improved by increasing the supply pressure above the minimum value 42H 50 SE 42H 100 i Maximum Air Loadung 100 psi air loaded models only Ambient Temperature Limits 40 C to 82 C 40 F to 180 F Maximum Air Flow scfm Delivered See Graph 1 on page 3 Air Consumpton See Graph 2 on page 3 Mounting eeeseseeeeeeeeeeseseeereseeereeereresseeeee In line bracket or flush panel on panels up to 1 4 thick Ambient Temperature Effect
10. d on the product nameplate part number or model number serial number and or version e For most software this information is given in the Help gt About screen e If there is a problem with product operation e Is the problem intermittent or repeatable What symptoms have been observed e What steps configuration changes loop modifications etc were performed before the problem occurred e What status messages error messages or LED indications are displayed e What troubleshooting steps have been performed e Is the installation environment e g temperature humidity within the product s specified operating parameters For software does the PC meet or exceed the minimum requirements e g processor memory operating system e A current copy of the product Service Instruction User s Manual or other technical literature should be at hand The Siemens public Internet site see the table has current revisions of technical literature in Portable Document Format for downloading e To send an instrument to Siemens for repair request a Return Material Authorization RMA IMPORTANT An instrument must be thoroughly cleaned decontaminated to remove any process materials hazardous materials or blood born pathogens prior to return for repair Read and complete the Siemens RMA form s For support and the location of your local Siemens representative refer to the table below for the URL of the Process Instrumentation
11. light grease Other lubrication is neither recommended nor required Disassembly 1 Remove regulator from service 2 Turn the adjustment screw counterclockwise to relieve the range spring tension 3 Make a diagonal mark across all mating parts This will provide for easier alignment during assembly 4 Refer to the Parts List remove the body screws and disassemble the regulator Assembly 1 Refer to the Parts List and assemble regulator 2 Observe the following hints 1 Position the exhaust diaphragm assembly on the bottom forging so that none of the holes in the periphery of the bottom forging are blocked 2 Position the exhaust ring on the exhaust diaphragm assembly to locate the 3 vent holes in the ring under the gauge connection see Figure 1 3 Position the center casting on the exhaust ring as shown in Figure 1 4 Install the nozzle seat assembly in the center casting before installing the stripper plate 5 Position the top casting on the top diaphragm assembly Typically the nameplate will be located over the gauge connection 3 Return regulator to service Range Change The range of a regulator can be changed by simple substitution of parts Change the range of a regulator by doing the following Obtain the model number of the regulator from the regulator nameplate located on the top casting Determine from the Model Designation section the model number of the desired range Refer to the Parts List List all
12. n the exhaust Refer to Cleaning section and decreased to minimum port due to a chip e g pipe dope clean the valve plunger and value Teflon tape thread shaving pipe scale exhaust port Usually detected by a heavy exhaust Heavy buildup on nozzle seat Refer to Cleaning and clean the nozzle seat Exhaust from vent hole Safety release valve operating normally in top casting Models see Principle of Operation 42H 30 and 42H 50 only Output at full value or SD42H Cleaning The items that will normally require cleaning are the restriction screw valve plunger and supply and exhaust ports Refer to Figure 5 during the following procedures Restriction Screw Turn off supply air Remove restriction screw by turning it counterclockwise with a screwdriver Remove filter screen from restriction screw by sliding it off Inspect filter screen for rips tears etc replace as necessary Inspect the O ring for cuts gouges etc replace as necessary Remove cleaning wire from bottom forging Se oe ee a hes E Insert the cleaning wire into the orifice on the end of the restriction screw Move the cleaning wire in and out several times to clear the orifice If the cleaning wire O RING cannot be inserted into the orifice soak the restriction en screw in solvent first to dissolve the blockage D4 ai ae CLEANING din v ap 2 oon WIRE S BOTTOM ku FORGING 8 Wipe the restriction screw and O ring clean or clean
13. nstruments can be prevented by using clean dry oil free instrument air as described in the Instrument Air Requirements section If these requirements are met routine maintenance should not be necessary Cleaning of the restriction screw valve plunger and the supply and exhaust ports is the only maintenance which may be needed on an occasional basis Refer to the Trouble Analysis table below when troubleshooting the regulator Trouble Analysis Symptom No supply air Turn on supply air and clean the restriction screw raise supply pressure Valve plunger not seating in the exhaust Refer to Cleaning section and Output cannot be port due to a chip e g pipe dope clean the valve plunger and increased to full value Teflon tape thread shaving pipe scale exhaust port Usually detected by a heavy exhaust Partially obstructed restriction screw Refer to Cleaning section and clean the restriction screw Output flow exceeds specification See Graph 1 or raise suppl l pressure response to increased sei Partially obstructed restriction screw Refer to Cleaning section and clean the restriction screw Regulator piped backwards Refer to Installation section and excessively heavy exhaust re a the regulator Loose restriction screw Tighten the restriction screw si the restriction screw oo ecreased l Exhaust port clogged Refer to Cleaning section and Beare E decrease supply pressure Output cannot be Valve plunger not seating i
14. ttom of the top diaphragm assembly equals the downward force of the range spring acting on the top of the top diaphragm assembly the regulator will be in balance All actions are reversed for counterclockwise adjustment of the adjustment screw A safety release valve is incorporated in the top diaphragm assembly of the 42H 30 and 42H 50 Models It exhausts air through the top casting if the output pressure becomes 3 to 15 psi above the adjusted output pressure An overpressure moves the top diaphragm upward to open the safety release valve The diaphragm movement is limited by the stripper plate eT age M y IWNKu Ss The Nullmatic regulator bleeds TL ADJUSTMENT SCREW only the amount of air which passes through the pilot nozzle when there is no demand for output flow The exhaust port RANGE SPRING SAFETY RELEASE starts to close as soon as the ATMOSPHERIC po T MN NOZZLE flow of regulated air is VEN increased to the output and it TOP EXHAUST DIAPHRAGM PORT closes completely before the ASSY GAUGE pilot plunger valve opens Full BE CONNECTION pilot flow is then delivered to EXHAUST oS the output DIAPHRAGM RR Lie 4 ASSY H mm A Papo PILOT PRESSURE CHAMBER RESTRICTION IO SCREW e VENT HOLES Te REBALANCE PASSAGE SUPPLY a gt REGULATED OUTPUT seent DNK IXILLA AAF e IK a NONE RAA SUPPLY PORT VALVE PLUNGER Figure 4 Schematic SD42H MAINTENANCE Most problems associated with pneumatic i
15. ument or for the application and use of information in this document The information herein is subject to change without notice Procedures in this document have been reviewed for compliance with applicable approval agency requirements and are considered sound practice Neither Siemens Industry Inc nor these agencies are responsible for product uses not included in the approval certification s or for repairs or modifications made by the user SD42H 10 SD42H PARTS LIST Siemens Nullmatic Pressure Regulator Drawing 7025PL 11 87 Supersedes 9 81 MODEL B M 42H30 7025 9353 42H50 7025 95S3 42H100 7025 100 6 42HA30 8334 10N2 42HA50 8334 11N2 42HA100 8334814 42HE30 7322815 42HE50 7322 10N2 42HE100 7322 11N4 42HAE30 10049 10N2 42HAE50 10049 11N2 42HAE100 10049813 MODELS 42HA MODELS 42H amp 42HAE amp 42HE Ay d ANAASANS 4 eee em LZ ek db SPR gna 31 amp 32 ee af DSCH ai vii Seil oe IMPORTANT Service Parts Kits are available for servicing the instrument Contact Siemens for currently available kits refer to the Customer Product Support section of this instruction Some parts in this Parts List may not be available for separate purchase 11 SD42H item gt OSSSFSsSssSepsa 10 11a 11b 12a 12b e 13 14a 14b Wl 16 17 8 19 20 21a 1447 22 3179 4 1447 41 3603 14 3603 5 2155 165 3494 4 2155 13 4557
16. with a non abrasive solvent zg om SC 9 Soak the filter screen in solvent and or blow through with e RESTRICTION compressed air to remove blockage SCREW PLUNGER 10 Place filter screen on restriction screw D PLUNGER SPRING 11 Install restriction screw in bottom forging by turning it A clockwise with a screwdriver Ensure restriction screw is Fyre AINING NUT turned in tightly 12 Replace cleaning wire in bottom forging 1 d E leese D 13 Return regulator to service UE mk Valve Plunger and Supply and Exhaust Ports gp 1 Turn off supply air Figure 5 Cleaning 2 Remove the retaining nut from the bottom forging with a 3 4 wrench The valve plunger and plunger spring should fall out 3 Wipe the valve plunger clean or if necessary clean with a non abrasive solvent 4 Clean the supply and exhaust ports The supply port is easily accessible the exhaust port can be reached with a tobacco pipe cleaner Use a non abrasive solvent to clean NOTE If excessive dirt buildup etc is encountered the regulator should be disassembled for thorough cleaning Read the Disassembly and Assembly sections before disassembling the regulator Place plunger spring on valve plunger Place valve plunger into bottom forging Install and tighten retaining nut Oo ND M Return regulator to service SD42H Lubrication The only lubrication that may be required is the lubrication of the adjustment screw threads with
Download Pdf Manuals
Related Search