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Masoneilan Model 37/38Spring-Diaphragm ActuatorsInstruction Manual (Rev.D)Baker Hughes Data Classification: Public

THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH ITIONTOTHECUSTOMER/OPERATOR’S NORMAL OPERATION AND MAINTENANCE PROCEDURES.SINCE OPERATION AND MAINTENANCE PHILOSOPHIES VARY, BAKER HUGHESCOMPANY (AND ITS SUBSIDIARIES AND AFFILIATES) DOES NOT ATTEMPT TODICTATE SPECIFIC PROCEDURES, BUT TO PROVIDE BASIC LIMITATIONS ANDREQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT PROVIDED.THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERALUNDERSTANDING OF THE REQUIREMENTS FOR SAFE OPERATION OF MECHANICALAND ELECTRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS.THEREFORE, THESE INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED INCONJUNCTION WITH THE SAFETY RULES AND REGULATIONS APPLICABLE AT THESITE AND THE PARTICULAR REQUIREMENTS FOR OPERATION OF OTHEREQUIPMENT AT THE SITE.THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONSIN EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE METIN CONNECTION WITH INSTALLATION, OPERATION OR MAINTENANCE. SHOULDFURTHER INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISEWHICH ARE NOT COVERED SUFFICIENTLY FOR THE CUSTOMER/OPERATOR'SPURPOSES THE MATTER SHOULD BE REFERRED TO BAKER HUGHES.THE RIGHTS, OBLIGATIONS AND LIABILITIES OF BAKER HUGHES AND THECUSTOMER/OPERATOR ARE STRICTLY LIMITED TO THOSE EXPRESSLY PROVIDEDIN THE CONTRACT RELATING TO THE SUPPLY OF THE EQUIPMENT. NOADDITIONAL REPRESENTATIONS OR WARRANTIES BY BAKER HUGHESREGARDING THE EQUIPMENT OR ITS USE ARE GIVEN OR IMPLIED BY THE ISSUE OFTHESE INSTRUCTIONS.THESE INSTRUCTIONS ARE FURNISHED TO THE CUSTOMER/OPERATOR SOLELYTO ASSIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCEOF THE EQUIPMENT DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED INWHOLE OR IN PART WITHOUT THE WRITTEN APPROVAL OF BAKER HUGHES.2 Baker Hughes 2021 Baker Hughes Company. All rights reserved.

Safety InformationAbout this ManualImportant –Please read before installation The information in this manual is subject tochange without prior notice. The information contained in this manual, inwhole or part, shall not be transcribed or copiedwithout Baker Hughes’s written permission. Please report any errors or questions about theinformation in this manual to your local supplier. These instructions are written specifically forthe 37/38 spring diaphragm actuator and do notapply for other equipment outside of this productline.These instructions contain DANGER,WARNING, and CAUTION labels, wherenecessary, to alert you to safety related orother important information. Read theinstructions carefully before installing andmaintaining your control valve. DANGERand WARNING hazards are related topersonal injury. CAUTION hazards involveequipment or property damage. Operation ofdamaged equipment can, under certainoperational conditions, result in degradedprocess system performance that can leadto injury or death. Total compliance with allDANGER, WARNING, and CAUTION noticesis required for safe operation.This is the safety alert symbol. It alerts you to potentialpersonal injury hazards. Obey all safety messages thatfollow this symbol to avoid possible injury or death.Indicates a potentially hazardous situation which, if notavoided, could result in death or serious injury.Indicates a potentially hazardous situation which, if notavoided, could result in serious injury.Indicates a potentially hazardous situation which, if notavoided, could result in minor or moderate injury.When used without the safety alert symbol, indicates apotentially hazardous situation which, if not avoided,could result in property damage.Note: Indicates important facts and conditions. 2021 Baker Hughes Company. All rights reserved.Useful LifeThe current estimated useful life period for the37/38 actuator is 25 years. To maximize theuseful life of the product, it is essential to conductannual inspections, routine maintenance andensure proper installation to avoid anyunintended stresses on the product. Thespecific operating conditions will also impact theuseful life of the product. Consult the factory forguidance on specific applications if required priorto installation.WarrantyItems sold by Baker Hughes are warranted to befree from defects in materials and workmanshipfor a period of one year from the date of shipmentprovided said items are used according to BakerHughes recommended usages. Baker Hughesreserves the right to discontinue manufacture ofany product or change product materials, designor specifications without notice.Note: Prior to installationThe equipment must be installed, put intoservice and maintained by qualified andcompetent professionals who haveundergone suitable training.All surrounding pipelines must bethoroughly flushed to ensure all entraineddebris has been removed from the system.Under certain operating conditions, the useof damaged equipment could cause adegradation of the performance of thesystem which may lead to personal injury ordeath.Changes to specifications, structure, andcomponents used may not lead to therevision of this manual unless such changesaffect the function and performance of theproduct.Masoneilan 37/38 Actuator Instruction Manual 3

DescriptionMaintenanceThe Masoneilan 37/38 spring-diaphragmactuator is a simple, powerful, mechanicaldevice. There are two general types: Air-toExtend Stem and Air-to-Retract Stem.Actuators are designated by case size: Nos. 9,11, 13, 15, 18 and 18L.Air-to-Extend Actuators (Type 37)The nominal range of a spring-diaphragmactuator is the air pressure range in pounds persquare inch (psi) for rated stroke under no load.Common ranges are 3–15 psi and 6–30 psi.The spring range and maximum allowablesupply pressure are marked on the serial plate.For a 3–15 psi nominal range, the stem willstart to stroke when the air pressure reaches 3psi, and will complete the stroke when thepressure reaches 15 psi (plus or minus 5%).In the air-to-extend actuator, conformation ofthe molded diaphragm to the diaphragm plateserves as a flexible upper guide for the actuatorstem (26). The lower guide is an oilimpregnated bronze bushing (37) located in thespring adjustor (36). The air-to-retract actuatordiffers from the air-to-extend unit in that thespring (22), spring barrel (71) and springadjustor (36) are located above the diaphragmplate (40) and diaphragm (39) which areinverted. A gasket (19) at the joint of thediaphragm case and yoke and a packing boxaround the actuator stem prevents air leakage.The diaphragm acts as a flexible upper guideand the packing box assembly as the lowerguide for the actuator stem.Air connections are 1/4" NPT. Connections arelocated in the upper diaphragm case (air-toextend actuators) or yoke ectiveDiaphragmArea (sq.in.)451113151818L711051452002004 Baker HughesDiaphragm ReplacementBefore disassembling the actuator, all springcompression should be relieved by turning thespring adjustor (36), to prevent the upper casepopping up when the cap screws (45) areremoved. This is especially important on actuatorswith a high initial spring setting. Remove capscrews (45), nuts (46) and upper diaphragm case(43). Remove nut (30) and washer (41) to releasethe diaphragm (39). If possible, the replacementdiaphragm should be of the molded type suppliedby GE Masoneilan, but in an emergency adiaphragm may be cut from flat sheet stock for upto and including No. 15 actuators. To allowsufficient stroke without restriction due to flatnessof the diaphragm, the diaphragm bolt circle shouldbe about 10% greater than that of the diaphragmcase.Replace washer (41), nut (30) and upperdiaphragm case.Spring AdjustmentAn air supply, with a gauge and regulator, shouldbe piped to the upper diaphragm case for thisadjustment. Adjust spring compression so that theactuator stem (26) just begins to move when airpressure reaches minimum pressure of the rangestamped on the serial plate. This movement ismost easily detected by feeling the stem as airpressure is applied.Note: Adjust spring compression only whenthere is no air pressure on diaphragm.MaximumStroke (in.)¾11½22½4 2021 Baker Hughes Company. All rights reserved.

Air-to-Retract Actuators (Type 38)Diaphragm ReplacementThe procedure is the same as for air-to-extendactuators except that the entire upper caseassembly (including spring barrel (71), spring(22), spring seats (33 and 34), nut (30) anddiaphragm plate (40) must be removed torelease the diaphragm. Install a new diaphragmand reassembly the above parts.Spring AdjustmentThe procedure is identical with that for air-toextend actuators except that supply air is pipedto the 1/4" port in the yoke. 2021 Baker Hughes Company. All rights reserved.Packing BoxThe packing box is subject to low air pressureonly and requires minimum maintenance.The packing rings have a square section and aremade of carbon core with braided PTFE jacket.The packing may be added to or completelyreplaced without disassembling either theactuator or the mechanism (or valve) to which itis attached. Be sure to tighten packing nut (20)lightly. Over-tightening will cause excessivefriction, resulting in sluggish performance.Masoneilan 37/38 Actuator Instruction Manual 5

Air-to-Extend Actuators (Type 37)Case Nos. 9, 11 & 13Case Nos. 15, 18 & 18LAir-to-Retract Actuators (Type 38)Case Nos. 9, 11 & 136 Baker HughesCase Nos. 15, 18 & 18L 2021 Baker Hughes Company. All rights reserved.

Parts ReferenceRef. No. 15Part NameComputerRef.Abbrev.No.Gasket (packing box)GASKET17YokeYOKE18Cap Screw (L case to yoke)CAP SCR 1937Part NameComputerAbbrev.Bushing (spring adjuster)BUSHINGDiaphragmDIAPHRM40Diaphragm PlateDPH PLT 39Gasket (L case to yoke)GASKET41Diaphragm WasherDPH WSH20Packing NutPKG NUT43Upper Diaphragm CaseU D CSE21Snap Ring ActuatorSNP RNG44Lower Diaphragm CaseL D CSE22Spring ActuatorACT SPR45Cap Screw (diaph. case)CAP22ASpring ActuatorACT SPR46Nut (diaph. case)NUT26StemSTM56Travel Indicator ScaleT I SCL30Nut (actuator stem)NUT57Machine Screw BallMCN SCR BALL31Packing BoxPKG BOX70and Retainer Spring& RTN SPRPackingPACKING71Barrel Spring BarrelBRL SBL33Spring Seat (upper)USPR ST72Cap Ball BearingCAP BBG34Spring Seat (lower)LSPR ST73RaceRCE35Pipe PlugPIP PLG74Cap Screw (SBL to U D CSE)CAP SCR36Spring Adjustor 32SPR ADJ Recommended spare parts. 2021 Baker Hughes Company. All rights reserved.Masoneilan 37/38 Actuator Instruction Manual 7