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STI RTQ Series Instruction Manual Download Page 33

 

STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY     

    www.imi-critical.com 

 

Manual 5300, rev. 09    06/2020 – RTQS

 

 

29

 

11  TROUBLESHOOTING 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Event 

Possible cause 

Remedy 

Actuator doesn’t work 
properly 

Lack of pneumatic supply 

Check supply line  

Defective main valve 

Consult valve manufacturer documentation 

Failure of the control 
group 

Call STI s.r.l. - Customer Care Dept. 

Actuator moves too slow 

Low supply pressure 

Adjust supply pressure 

Incorrect speed control 
settings 

Adjust speed controls to increase flow 

Exhaust port blocked 

Remove and clean the exhaust port silencers and 
replace 

Wear of the main valve 

Consult valve manufacturer documentation 

Actuator moves too fast 

High supply pressure 

Reset  

Incorrect speed control 
settings 

Adjust speed controls to decrease flow 

Leakages on pneumatic 
circuits  

Deterioration and/or 
damage to gaskets and or 
loose fittings 

Tighten the loose fittings 
Call STI s.r.l. - Customer Care Dept.. 

Damage to fittings 

Call STI s.r.l. - Customer Care Dept. 

Leakages on pneumatic 
cylinder 

Damage to seals 

Replace cylinder seals 

Incorrect position of the 
valve  

Wrong adjustment of 
mechanical stops 

Re-adjust setting  

Wrong electric limit 
switches indication. 

Re-adjust setting  

Summary of Contents for RTQ Series

Page 1: ...Quarter turn pneumatic actuator RTQ Series Single acting version type RTQS INSTRUCTION MANUAL 5300 ...

Page 2: ...on 13 G Alfieri F Tondolo 10 01 2017 6 Revised 1 6 added 7 3 M Bozzarelli F Tondolo 15 02 2016 5 Revision M Bozzarelli D Lamoure 22 09 2015 4 Revision M Bozzarelli D Lamoure 11 09 2013 3 Revision G Alfieri D Lamoure 31 05 2013 2 Revision D Lamoure F Tondolo 26 02 2013 1 Revision P G A Engineering D Lamoure 31 10 2012 0 Issue P G A Engineering D Lamoure STI S r l has taken every care in collecting ...

Page 3: ...RECEPTION 7 5 1 LIFTING AND HANDLING 7 5 2 CHECK AT THE RECEPTION 8 5 3 STORAGE 9 5 4 REQUIREMENTS OF STABILITY 9 5 5 INTERFACE DOCUMENT AND DIMENSIONAL DRAWING 9 6 INSTALLATION 10 6 1 CHECKS TO BE PERFORMED BEFORE INSTALLATION 10 6 2 ASSEMBLING OF THE ACTUATOR ON THE VALVE 10 6 3 PNEUMATIC CONNECTIONS 12 6 4 ELECTRICAL CONNECTIONS IF ANY 12 6 5 EARTH CONNECTION 12 7 OPERATION AND USE 13 7 1 OPERA...

Page 4: ...AL ASSEMBLIES AND PARTS LIST 30 12 1 SCOTCH YOKE MECHANISM 30 12 2 PNEUMATIC CYLINDER 31 12 3 STOPPER ASSEMBLY FOR PNEUMATIC CYLINDER 32 12 4 SPRING SINGLE PACKAGE CARTRIDGE 33 12 5 SPRING DOUBLE PACKAGE CARTRIDGE 34 12 6 STOPPER ASSEMBLY FOR SPRING CARTRIDGE 35 13 SPARE PARTS KIT 35 14 DECOMMISSIONING 36 14 1 GENERAL INFORMATION 36 14 2 RECYCLING AND DISPOSAL 36 14 3 SPRING CARTRIDGE DEMOLITION 3...

Page 5: ...ufacturer of the described RTQS actuator series is STI S r l as specified on the machinery nameplate STI S r l Via Dei Caravaggi 15 24040 Levate BG Italy Tel 39 035 2928 2 Fax 39 035 2928 247 imisti sales imi critical com 1 4 Terms and conditions STI S r l guarantees each single product to be free from defects and to conform to current goods specifications The warranty period is one year from the ...

Page 6: ...atibility EMC 2014 34 EU Directive concerning equipment for use in potentially explosive atmospheres ATEX Applicable only when electrical control panel is supplied integrate with the actuator 1 7 Symbology Used 1 7 1 Signs of warning Be careful where these symbols are shown they indicate a potentially hazardous situation and they warn that if the steps are not properly performed MAY RESULT CAUSING...

Page 7: ...external mechanical stops arranged into the side wall of the mechanism body and into the end flange of the pneumatic cylinder The cover of the centerbody of the scotch yoke mechanism is machined to provide the assembly pattern for any required accessories i e positioner signalling limit switches position transducer etc by means of proper matching units The above mentioned accessories are operated ...

Page 8: ...ing Size 3 Spring Size 4 F Model 01 Model 02 Model 03 Model 04 Model 05 Model 06 Model 07 Model 08 V Model Diameter 535 mm Diameter 585 mm Spring pack model Diameter 300 mm Diameter 335 mm Diameter 385 mm Diameter 435 mm Diameter 485 mm Diameter 1100 mm Diameter 1200 mm Diameter 1300 mm Diameter 935 mm Diameter 1000 mm R C M Y Model 01 Diameter 735 mm Diameter 785 mm Diameter 835 mm Model 02 Model...

Page 9: ...equirements and specifications Rated torque per Model RTQS 01 Series up to 12 000 Nm RTQS 02 Series up to 22 000 Nm RTQS 03 Series up to 40 000 Nm RTQS 04 Series up to 70 000 Nm RTQS 05 Series up to 125 000 Nm RTQS 06 Series up to 220 000 Nm RTQS 07 Series up to 400 000 Nm RTQS 08 Series up to 600 000 Nm Design life 30 years Applications On Off Modulating service on request 1 Recommended quality o...

Page 10: ...ion key 1 pressure which generate the maximum rated torque in static conditions at the limits of the yoke which can be considered coincident with the design pressure used for the design of the pressure containing parts 2 pressure which generate the maximum operating torque along all the stroke in dynamic conditions 3 minimum pressure in the cylinder available from the supply line or set pressure a...

Page 11: ...ctuator alone and not for the valve actuator assembly Avoid that during the handling the actuator passes above the staff The actuator should be handled with appropriate lifting means considering the mass of actuator The mass is reported on the delivery bill and on the overall dimensions drawings furnished with the documents accompanying the actuator In case the information regarding the mass is mi...

Page 12: ...ose of order confirmation Sect 4 Check that the actuator is equipped with the fittings as provided for by order confirmation Check that the actuator was not damaged during transportation if necessary renovate the painting according to the specification reported on the order confirmation If the actuator is received already assembled with the valve its settings have already been made at the factory ...

Page 13: ... connections if present Check that the limit switch box if any is properly closed If the storage is long term or outdoor Keep the actuator protected from direct weather or ambient conditions using suitable means If the entries should remain exposed to the ambient replace plastic plugs of pneumatic and electrical connections if any with metal plugs that guarantee perfect tightness 5 4 Requirements ...

Page 14: ...ter surface of the actuator is free from dust and dirt Clean the actuator flange and remove anything that might prevent a perfect adherence to the actuator coupling block flange and joint especially all traces of grease 6 2 Assembling of the actuator on the valve The actuator can be assembled on top of the valve flange either by using the actuator housing flange with threaded holes or by the inter...

Page 15: ...e correct transmission of required valve torque Table 1 Table 2 Actuator ISO 5211 flange Bolts Tightening torque Nm 1 Bolts Tightening torque Nm 1 Bolts Tightening torque Nm 1 RTQS 01 F25 8 x M16 180 M10 40 M36 1 800 RTQS 02 F30 8 x M20 340 M12 70 M42 3 000 RTQS 03 F35 8 x M30 800 M16 180 RTQS 04 F40 8 x M36 1 800 M20 340 RTQS 05 F48 12 x M36 1 800 M24 550 RTQS 06 F60 20 x M36 1 800 M27 700 RTQS 0...

Page 16: ...ded connections occur Make the connections according to the operating diagram Check the absence of leakages from pneumatic connections If necessary tighten the nuts of the pipe fittings 6 4 Electrical Connections If any Warning Before carrying out electrical connections switch off any power and control lines Use components appropriate as for type material and dimensions The connections should be m...

Page 17: ...s for ON OFF or modulating heavy duty service This RTQS actuator is produced by STI srl Manufacturer and identified by a nameplate with a product designation code STI srl will not be liable for any possible damage or physical injury resulting from use in other than the designated applications or by lack of care during installation operation adjustment and maintenance of the machine Such risks lie ...

Page 18: ...cified application Warning It is strictly forbidden to use the actuator under conditions other than those provided on the nameplate 7 5 Residual Risks Warning The actuator contains springs under load and can have pressurized parts both during operation and at rest use the due precautions Use individual protections provided for by the laws and provisions in force Risk due to movements of loads duri...

Page 19: ... the valve stop the rotary stroke at both extreme valve positions fully open and fully closed except when different configuration is required by the type of the valve i e eccentric butterfly valves The setting of the open closed valve position is performed by adjusting the setting screws foreseen into the end flanges of the cylinder and spring cartridge see Fig 5 and 6 for spring to Close version ...

Page 20: ...en the nut 7 3 from the setting screw 7 2 and unscrew the setting screw 7 2 until it remains only a few threads engaged on the end flange of the cylinder By pressurizing the cylinder move the valve until it reach the correct setting in closed position fix then the valve position by screwing the setting screw 7 2 until it stops on the end part of the internal piston Taking care not to damage it rei...

Page 21: ...eration keep the setting screw 8 2 blocked by using an Allen wrench engaged on the on the hexagonal receptacle Fig 7 Stroke adjustment detail Fig 8 Stroke adjustment detail When completed the setting operations it is recommended to operate the actuator with pneumatic supply and spring to check that the actuator moves properly and that there are no leakages in the cylinder circuit ...

Page 22: ... the information to enable the operator to know the position of the manual override Position of the valve is provided by the local indicator described at paragraph 2 2 item 6 8 3 1 Indication of position of the manual override 8 3 1 1 Manual Override type HP For this type of Manual Override a specific Instruction Manual 2094 is available By means a selector lever it is possible to select LOCAL or ...

Page 23: ...hausting the supply pressure check that the actuator is able to reach the fully closed position in case of fail close actuator or the fully open position in case of fail open actuator it is possible to verify the correctness of the fully stroked position by checking the position indicator or limit switches if fitted In case the actuator is not able to reach fully stroke verify the position of manu...

Page 24: ...s remote control local control emergency controls etc if this is allowed by the conditions of the plant Check that the signals to the remote control desk are correct Check that the pneumatic supply pressure value is within the required range If there is an air filter on the actuator bleed the condense water accumulated in the cup by opening the drain cock Disassemble the cup periodically and wash ...

Page 25: ...es the removing of the actuator from the valve and disassemble it in the workshop spring package cannot be opened except for demolition following the next paragraph 14 3 Warning Before performing any maintenance activity use always wear protective gloves footwears clothing high visibility jacket eyewear and any other protective device prescribed by the Local Rules depending on the working conditio...

Page 26: ...mble the flange 2 4 and replace the O ring 2 11 Remove travel stop protection 4 2 if necessary replace o ring 4 3 9 3 2 Re assembling of the pneumatic cylinder in field Carefully clean the inside of the tube and check that the entire surface particularly that of the bevels is not damaged Lubricate with a protective oil see next Section 10 the tube internal surface and the bevels at the ends Lubric...

Page 27: ...ent In this case it is possible to replace the broken tie rod in field even if the cylinder in under pressure Remove with wrench the broken pieces install a new tie rod and then tighten the nut Warning Tightening torque must respect the values shown in Table 3 based on the material stated on note 1 Failed tie rod Fig 14 Cylinder tie rod replacement 1 The torque values in Table 3 have been calculat...

Page 28: ... to avoid wrong repositioning during the actuator reassembling on the valve Warning Don t try to open the spring package This operation can be done only during a decommissioning phase according to the instruction of the next paragraph 14 3 of this Manual Important Before starting the removal operations it is recommended to put a sign between the coupling flange of the actuator or its adaptor flang...

Page 29: ...ing 1 3 and replace the O ring 1 15 1 16 Clean the seal groove carefully and lubricate it with protective oil or grease film Fig 17 Scotch yoke mechanism seals replacement Once perform these actions is possible to remove the gasket between actuator housing and cylinder 2 Remove the screw 1 11 to disengage the guide block from spring cartridge move the scotch yoke in central position 45 remove the ...

Page 30: ...semble the bushing 1 3 and replace the O rings 1 16 1 15 Fig 19 Scotch yoke mechanism seals replacement To replace the gasket between actuator and spring cartridge once the cover 1 5 has been removed is necessary to remove the screw 1 11 to disengage the guide block from spring cartridge after that remove the fixing nut 5 3 on the spring cartridge side remove the spring cartridge 3 and replace the...

Page 31: ... torque shown in the following Table 4 using a dynamometric wrench Assemble the o ring the cover gasket and the cover with all screw Table 4 Bolts Tightening torque Nm 1 Bolts Tightening torque Nm 1 M10 40 M30 800 M12 70 M33 1 200 M16 180 M36 1 800 M20 340 M42 3 000 M24 550 M27 700 9 3 8 Reassembling of the actuator on the valve This activity must be done following the instructions of previous Sec...

Page 32: ...rease the following products are recommended 10 1 Scotch yoke mechanism see Paragraph 12 1 Molykote G 4700 grease produced by Dow Corning 10 2 Pneumatic cylinder see Paragraph 12 2 Rheosil 500 F oil produced by Nye Lubricant Inc Important The above products cover the full range of temperatures from 60 C up to 100 C Equivalent products can be used provided that they have the same characteristics an...

Page 33: ...flow Exhaust port blocked Remove and clean the exhaust port silencers and replace Wear of the main valve Consult valve manufacturer documentation Actuator moves too fast High supply pressure Reset Incorrect speed control settings Adjust speed controls to decrease flow Leakages on pneumatic circuits Deterioration and or damage to gaskets and or loose fittings Tighten the loose fittings Call STI s r...

Page 34: ...loy steel 2 Guide block 1 Carbon steel 3 Scotch yoke bushing 2 Bronze 4 Housing 1 Carbon steel 5 Cover 1 Carbon steel 6 Cylinder pin 4 Alloy steel 7 Scotch yoke 1 Carbon steel 8 Cover gasket 1 Fiber 9 Plate 1 Carbon steel 10 Plate 1 Carbon steel 11 Screw 2 Carbon steel 12 Screw 2 Carbon steel 13 Screw Carbon steel 14 Screw 10 Carbon steel 15 Seal washer Carbon steel NBR 16 O ring 2 NBR 17 O ring 2...

Page 35: ...teel 3 Nut 1 Carbon steel 4 Flange 1 Carbon steel 5 Nut Carbon steel 6 Sliding guide 2 PTFE 7 Piston 1 Carbon steel 8 Plug 1 Carbon steel 9 Screw 4 Carbon steel 10 O ring 1 NBR 11 O ring 1 NBR 12 O ring 2 NBR 13 O ring 1 NBR 14 Stem 1 Alloy steel 15 Head flange 1 Carbon steel 16 End Flange 1 Carbon steel 17 Tie rods Alloy steel NBR standard material for temperature range from 30 C up to 100 C spec...

Page 36: ...com Manual 5300 rev 09 06 2020 RTQS 32 12 3 Stopper assembly for pneumatic cylinder Stopper assembly part list Item Description Qty Material Spare Parts 1 Protection Washer 1 Stainless Steel 2 Setting screw 1 Stainless steel 3 Nut 1 Stainless steel 4 Sealing washer 1 PTFE ...

Page 37: ...ng ring 1 Alloy steel 2 Spring ring 1 Alloy steel 3 Bushing 1 Steel Bronze PTFE 4 Thrust flange 1 Carbon steel 5 Head flange spring guide 1 Carbon steel 6 Additional spring 1 Alloy steel 7 Spring 1 Alloy steel 8 Lifting eyelet 2 Carbon steel 9 Half ring 1 Carbon steel 10 Half ring 1 Carbon steel 11 Stem 1 Alloy steel 12 Plug 2 Carbon steel 13 End flange 1 Carbon steel 14 Cartridge tube 1 Carbon st...

Page 38: ... 1 Elastic ring 1 Alloy steel 2 Bushing 1 Steel Bronze PTFE 3 Thrust flange 1 Carbon steel 4 Intermediate guide 1 Carbon steel 5 Head flange 1 Carbon steel 6 Spring 2 Alloy steel 7 Additional spring 2 Alloy steel 8 Lifting eyelet 2 Carbon steel 9 Sliding guide 1 PTFE 10 Retaining ring 1 Carbon steel 11 Retaining ring 1 Carbon steel 12 Stem 1 Alloy steel 13 Plug 1 Carbon steel 14 End cap 1 Carbon s...

Page 39: ...TFE 5 O ring 1 NBR NBR standard material for temperature range from 30 C up to 100 C special material available for 60 C 13 SPARE PARTS KIT General references for the actuator parts and recommended spare parts are shown in the tables of the previous Section 12 Important Recommended spare parts are marked with in the previous tables Individual kit including all the recommended spare parts can be or...

Page 40: ...extended The demolition of actuator parts should be made from specialized personnel 14 2 Recycling and disposal Subject Hazardous Recyclable Disposal Metals No Yes Use licensed recyclers Plastics No Yes Use specialist recyclers Rubber seals and O rings Yes No May require special treatment before disposal use specialist waste disposal companies Oil and grease Yes Yes May require special treatment b...

Page 41: ... dangerous if certain safety precautions are not observed Here following the minimum Before starting to disassemble the spring cartridge a large slot must be created using a blowtorch or a grinding wheel on the spring container to allow to discover at least 3 or 4 coils of the spring see Figure 20 Cut all the spring coils accessible from the slot to release the spring tension Now the spring cartri...

Page 42: ...STI S r l Via Dei Caravaggi 15 24040 Levate BG ITALY www imi critical com Manual 5300 rev 09 06 2020 RTQS 38 15 Declaration of Incorporation ...

Page 43: ......

Page 44: ...ter Turn Division Via San Francesco 18 29017 Fiorenzuola d Arda PC Italy Tel 39 035 2928 2 Fax 39 0523 1715 295 IMI Critical Engineering Lakeside Solihull Parkway Birmingham Business Park Birmingham B37 7XZ United Kingdom Tel 44 0 121 717 3700 Fax 44 0 121 717 3701 www imi critical com imisti sales imi critical com ...

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