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MSI LT, Technical Manual

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MSI LT VALVE TECHNICAL MANUAL 

Revision D 

 

April 03, 2014 

25 

o

 

Install the 

insert o-rings 

(11)

 into the 

insert (12)

 

grooves and coat with 
grease to retain the rings. 

 

 

 
 

 
 
 

 
 

 
 

 
 

o

 

Make sure the entire 
sealing surface is 
thoroughly greased. 

 
 

 
 

 
 

 
 
 

 
 

 
 

 

o

 

Secure the plug to the 

adjusting nut with the 

plug 

bolt (1)

 and 

washers (2 

& 3)

. 

 

 

Summary of Contents for LT

Page 1: ...ion D April 03 2014 LT VALVE TECHNICAL MANUAL MSI is a division of Dixie Iron Works Ltd 300 West Main St Alice Texas 78332 Phone 1 800 242 0059 Phone 1 361 664 6597 Fax 1 361 664 4840 Email sales diwmsi com ...

Page 2: ...YPE TEXT 31 4 0 EXPLODED VIEW 5 INCH 33 4 1 PARTS LIST 34 5 0 ASSEMBLY PROCEDURE UNISERT TYPE 5 INCH 35 5 1 ASSEMBLY PROCEDURE UNISERT TYPE 5 INCH TEXT 44 5 2 ASSEMBLY PROCEDURE SPLIT INSERT TYPE 5 INCH 46 5 3 ASSEMBLY PROCEDURE SPLIT INSERT TYPE 5 INCH TEXT 55 6 0 DISASSEMBLY PROCEDURE 57 7 0 MAINTENANCE 58 8 0 REPAIR AND INSPECTION 59 8 1 DISASSEMBLY TIPS 61 8 2 SANDING TIPS 62 8 3 ASSEMBLY TIPS...

Page 3: ...Joint Clamp Hub and our own metal to metal WingSeal WS20 and WS30 are just a few of the available choices All sizes of MSI valves can be outfitted with your choice of end connections or combinations to suit your specific application Custom end to end lengths are also available on some valves Compact Design Lightweight Longer lasting internals Ease of repair Interchangeability SafeTap grease fittin...

Page 4: ...eal eliminates wetted threads and pipe taps Since the threads do not perform a sealing function they do not require Teflon tape or other sealing aids The heavier cross section stands up better to impacts Each fitting has a slot machined through the threads which serves as a pressure relief path in the event of a leak The metal to metal seal and the pressure relief slot of the SafeTap grease fittin...

Page 5: ...ion while in service Dual 360 grease channels Forces grease into 360 of the seal area when closed Allows for complete distribution of lubricant immediately prior to opening a valve when exposure to high temperatures and well fluids may have compromised the existing grease Greasing in the closed position can stop or significantly slow leaks in valves with worn or damaged parts Grease fitting instal...

Page 6: ...MSI LT VALVE TECHNICAL MANUAL Revision D April 03 2014 6 2 0 EXPLODED VIEW ...

Page 7: ...E ADAPTER 5 1 STOP COLLAR 6 1 RESILIENT SEAL 7 1 SAFETAP GREASE FITTING 8 1 VALVE BODY 9 2 PLUG SEAL 10a 1 PLUG 10b 1 GreaSeal PLUG 11 2 INSERT O RING 12a 1 UNIsert 12b 1 INSERT SET SPLIT 13 1 ADJUSTING NUT O RING 14 1 ADJUSTING NUT 15 2 ROLL PIN OUTER LG 16 2 ROLL PIN INNER SM 17 1 WING NUT 18 1 NUT RETAINER SET 19 1 SPIRAL RETAINER RING 20 1 STOP BOLT ...

Page 8: ...faces around the valve bore inside the valve pocket for sharp edges that could cause cutting of the insert o rings Then screw the clean adjusting nut 14 all the way into the valve body to make sure the threads are not damaged o After inspection remove the adjusting nut 14 grease the sealing groove and install the adjusting nut o ring 13 in the groove o Check the roll pins 15 16 in the valve body b...

Page 9: ...s the recess facing away from the pressure o Apply a thin film of lubricant to the recess in the adjusting nut 14 and install the plug seal 9 with the metal back towards the recess facing away from the pressure o Check the plug 10 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair ...

Page 10: ...of the UNIsert 12 making sure it does not have any scratches dings nicks or sharp edges that could also affect the sealing area See 8 2 SANDING TIPS for repair o Inspect the adjusting nut o ring 13 for any possible non conformity o Pack the adjusting nut 14 plug seal 9 with valve grease ...

Page 11: ...Place the UNIsert 12 on the adjusting nut 14 o Apply a thin film of grease to the entire O D of the plug 10 o Install the lower end of the plug 10 opposite the hex in the UNIsert 12 and adjusting nut 14 and push down until the plug shoulders on the adjusting nut ...

Page 12: ... insert o rings 11 in to the grooves on the UNIsert 12 and pack with grease to retain the rings and thoroughly grease the sealing surfaces o Secure the plug 10 to the adjusting nut 14 with the plug bolt 1 and two washers 2 3 o Lubricate the valve pocket with valve grease ...

Page 13: ...3 o Apply thread compound Never Seez to the adjusting nut threads and adjusting nut sealing surfaces o Support the valve so that the plug 10 hex can pass through unobstructed o Install the plug 10 UNIsert 12 and adjusting nut 14 assembly into the valve body ...

Page 14: ...beyond proper alignment as actuating an over tightened valve could damage internal parts If sight through the bore is not possible then screw in the adjusting nut until or no thread is visible o Apply thread compound never Seez to the threads on the SafeTap grease fitting 7 NOTE Do not use Teflon tape on the grease fitting o Install SafeTap grease fitting 7 and torque to 80 ft lbs ...

Page 15: ... Revision D April 03 2014 15 o Place spiral retainer ring 19 on male end if required o Then place wing nut 17 on male end and install the nut retainer set 18 if required o Secure the retainers with spiral retainer ring if required ...

Page 16: ...L MANUAL Revision D April 03 2014 16 o Install stop bolt 20 o Install stop collar 5 NOTE Valves with bores smaller than 2 do not use a stop collar the detent is integral to the handle adapter o Install the handle adapter 4 ...

Page 17: ...ECHNICAL MANUAL Revision D April 03 2014 17 o Secure handle adapter 4 with the plug bolt 1 and washers 2 3 o Remove excess grease from valve bore o Inspect plug alignment and adjust as necessary with adjusting nut 14 ...

Page 18: ...evision D April 03 2014 18 o Grease the counter bore of the valve body female end and press the resilient seal 19 lip end towards the valve in until the lip on the OD of the seal snaps into the groove in the back of the counter bore ...

Page 19: ...tal back towards the recess facing away from the pressure 5 Apply a thin film of lubricant to the recess in the adjusting nut 14 and install the plug seal 9 with the metal back towards the recess facing away from the pressure 6 Check the plug 10 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair 7 Che...

Page 20: ...threads on the SafeTap grease fitting 7 NOTE Do not use Teflon tape on the grease fitting 21 Install SafeTap grease fitting 7 and torque to 80 ft lbs 22 Place spiral retainer ring 19 on male end if required 23 Then place wing nut 17 on male end and install the nut retainer set 18 if required 24 Secure the retainers with spiral retainer ring if required 25 Install stop bolt 20 26 Install stop colla...

Page 21: ...faces around the valve bore inside the valve pocket for sharp edges that could cause cutting of the insert o rings Then screw the clean adjusting nut 14 all the way into the valve body to make sure the threads are not damaged o After inspection remove the adjusting nut 14 grease the sealing groove and install the adjusting nut o ring 13 in the groove o Check the roll pins 15 16 in the valve body b...

Page 22: ...ds the recess facing away from the pressure o Apply a thin film of lubricant to the recess in the adjusting nut 14 and install the plug seal 9 with the metal back towards the recess facing away from the pressure o Check the plug 10 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair ...

Page 23: ...he adjusting nut 14 o Install the lower end of the plug 10 opposite the hex in the adjusting nut 14 and push down until the plug shoulders on the adjusting nut NOTE For the 0 38 and 1 valves do not push the plug 10 all the way down yet o Apply a thin film of grease to the entire O D of the plug 10 ...

Page 24: ...ing sure they do not have any scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair o Inspect the insert o rings 11 for any possible non conformity o Place the inserts 12 around the plug 10 NOTE For the 0 38 and 1 valves push the plug 10 all the way down now ...

Page 25: ... 03 2014 25 o Install the insert o rings 11 into the insert 12 grooves and coat with grease to retain the rings o Make sure the entire sealing surface is thoroughly greased o Secure the plug to the adjusting nut with the plug bolt 1 and washers 2 3 ...

Page 26: ...pril 03 2014 26 o Lubricate the valve pocket with valve grease o Apply thread compound Never Seez to the adjusting nut threads and adjusting nut sealing surfaces o Install the plug 10 inserts 12 and adjusting nut 14 assembly into the valve body ...

Page 27: ... 10 hex can pass through unobstructed o Tighten the adjusting nut 14 until snug and back off turn from snug position o Apply thread compound Never Seez to the threads on the SafeTap grease fitting 7 Install grease fitting and torque to 80 ft lbs NOTE Do not use Teflon tape on the grease fitting ...

Page 28: ... Revision D April 03 2014 28 o Place spiral retainer ring 19 on male end if required o Then place wing nut 17 on male end and install the nut retainer set 18 if required o Secure the retainers with spiral retainer ring if required ...

Page 29: ...03 2014 29 o Install stop bolt 20 o Install stop collar 5 and handle adapter 4 NOTE Valves with bores smaller than 2 do not use a stop collar the detent is integral to the handle adapter o Secure handle adapter 4 with the plug bolt 1 and washers 2 3 ...

Page 30: ... grease from valve bore o Inspect plug alignment and adjust as necessary with adjusting nut 14 o Grease the counter bore of the valve body female end and press the resilient seal 19 in until the lip on the OD of the seal snaps into the groove in the back of the counter bore ...

Page 31: ...eal 9 with the metal back towards the recess facing away from the pressure 5 Apply a thin film of lubricant to the recess in the adjusting nut 14 and install the plug seal 9 with the metal back towards the recess facing away from the pressure 6 Check the plug 10 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS...

Page 32: ...rease fitting 7 Install grease fitting and torque to 80 ft lbs NOTE Do not use Teflon tape on the grease fitting 22 Place spiral retainer ring 19 on male end if required 23 Then place wing nut 17 on male end and install the nut retainer set 18 if required 24 Secure the retainers with spiral retainer ring if required 25 Install stop bolt 20 26 Install stop collar 5 and handle adapter 4 NOTE Valves ...

Page 33: ...MSI LT VALVE TECHNICAL MANUAL Revision D April 03 2014 33 4 0 EXPLODED VIEW 5 VALVE ...

Page 34: ...ODY 2 2 SAFETAP GREASE FITTING 3 12 STUDS 4 12 NUTS 5 2 PLUG SEAL 6a 1 PLUG 6b 1 GreaSeal PLUG 7a 1 UNIsert 7b 1 INSERT SET SPLIT 8 2 INSERT O RING 9 1 O RING FACE SEAL RING 10 1 SEAL RING 11 1 O RING ADJUSTING NUT 12 1 ADJUSTING NUT 13 1 FLAT WASHER 14 1 SOCKET HEAD BOLT 15 4 ROLL PIN OUTER LG 16 4 ROLL PIN INNER SM ...

Page 35: ...empt to screw the adjusting nut in with the valve pocket in the horizontal position could result in damage to the adjusting nut and valve sealing components o Check surfaces around the valve bore inside the valve pocket for sharp edges that could cause cutting of the insert o rings Then screw the clean adjusting nut 12 all the way into the valve body to make sure the threads are not damaged o Afte...

Page 36: ...ubricant to the recess in the adjusting nut 12 and install the plug seal 5 with the metal back towards the recess facing away from the pressure o Apply grease to the plug seal 5 in the adjusting nut 12 o Grease the sealing groove and install the adjusting nut o ring 11 in the groove ...

Page 37: ... 1 and install the plug seal 5 with the metal back towards the recess facing away from the pressure o Check the plug 6 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair o Support the valve so that the plug hex can pass through unobstructed ...

Page 38: ... 6 hex side down in the valve body o Check the surface finish of the insert 7 making sure they do not have any scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair o Inspect the insert o rings 8 for any possible non conformity ...

Page 39: ...D April 03 2014 39 o Install the insert o rings 8 into the insert 7 grooves and coat with grease to retain the rings o Make sure the entire sealing surface is thoroughly greased o Apply a thin film of grease to the entire I D of the insert 7 ...

Page 40: ... Place the insert 7 around the plug 6 in the valve body making sure it slides into the roll pins o Apply thread compound Never Seez to the adjusting nut threads and adjusting nut sealing surfaces o Grease the seal ring 10 groove and insert the o ring 9 over it ...

Page 41: ... the top of the insert 7 o Install the adjusting nut 12 into the valve body and tighten until snug and back off turn from the snug position o Apply thread compound Never Seez grease to the plug bolt 14 threads and tighten it with the allen wrench on the adjusting nut side of the plug 6 ...

Page 42: ... compound Never Seez to the threads on the SafeTap grease fitting 2 Install grease fitting and torque to 80 ft lbs NOTE Do not use Teflon tape on the grease fitting o Remove excess grease from valve bore o Inspect plug alignment and adjust as necessary with adjusting nut 12 ...

Page 43: ...ICAL MANUAL Revision D April 03 2014 43 o Apply Removable Threadlocker blue in the threads of the stud end and screw the studs 3 until tight Screw the nuts 4 on the studs 3 Note Do not use High Strength red Threadlocker ...

Page 44: ... and down the length of the roll pin slots without interference 3 Apply a thin film of lubricant to the recess in the adjusting nut 12 and install the plug seal 5 with the metal back towards the recess facing away from the pressure 4 Apply grease to the plug seal 5 in the adjusting nut 12 5 Grease the sealing groove and install the adjusting nut o ring 11 in the groove 6 Apply a thin film of lubri...

Page 45: ...justing nut 12 into the valve body 1 and tighten until snug and back off turn from the snug position 21 Apply thread compound Never Seez grease to the plug bolt 14 threads and tighten it with the allen wrench on the adjusting nut side of the plug 6 22 Apply thread compound Never Seez to the threads on the SafeTap grease fitting 2 Install grease fittings and torque to 80 ft lbs NOTE Do not use Tefl...

Page 46: ...mpt to screw the adjusting nut in with the valve pocket in the horizontal position could result in damage to the adjusting nut and valve sealing components o Check surfaces around the valve bore inside the valve pocket for sharp edges that could cause cutting of the insert o rings Then screw the clean adjusting nut 12 all the way into the valve body to make sure the threads are not damaged o After...

Page 47: ...ubricant to the recess in the adjusting nut 12 and install the plug seal 5 with the metal back towards the recess facing away from the pressure o Apply grease to the plug seal 5 in the adjusting nut 12 o Grease the sealing groove and install the adjusting nut o ring 11 in the groove ...

Page 48: ... 1 and install the plug seal 5 with the metal back towards the recess facing away from the pressure o Check the plug 6 outside diameter for surface defects such as scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair o Support the valve so that the plug hex can pass through unobstructed ...

Page 49: ... 6 hex side down in the valve body o Check the surface finish of the inserts 7 making sure they do not have any scratches dings nicks or sharp edges that could affect the sealing area See 8 2 SANDING TIPS for repair o Inspect the insert o rings 8 for any possible non conformity ...

Page 50: ...April 03 2014 50 o Install the insert o rings 8 into the insert 7 grooves and coat with grease to retain the rings o Make sure the entire sealing surface is thoroughly greased o Apply a thin film of grease to the entire I D of the insert set 7 ...

Page 51: ... Place the inserts 7 around the plug 6 in the valve body making sure it slides into the roll pins o Apply thread compound Never Seez to the adjusting nut threads and adjusting nut sealing surfaces o Grease the seal ring 10 groove and insert the o ring 9 over it ...

Page 52: ...n the top of the inserts o Install the adjusting nut 12 into the valve body and tighten until snug and back off turn from the snug position o Apply thread compound Never Seez grease to the plug bolt 14 threads and tighten it with the allen wrench on the adjusting nut side of the plug 6 ...

Page 53: ... compound Never Seez to the threads on the SafeTap grease fitting 2 Install grease fitting and torque to 80 ft lbs NOTE Do not use Teflon tape on the grease fitting o Remove excess grease from valve bore o Inspect plug alignment and adjust as necessary with adjusting nut 12 ...

Page 54: ...ICAL MANUAL Revision D April 03 2014 54 o Apply Removable Threadlocker blue in the threads of the stud end and screw the studs 3 until tight Screw the nuts 4 on the studs 3 Note Do not use Red High Strength Threadlocker ...

Page 55: ... 7 into the valve The inserts 7 should move freely up and down the length of the roll pin slots without interference 3 Apply a thin film of lubricant to the recess in the adjusting nut 12 and install the plug seal 5 with the metal back towards the recess facing away from the pressure 4 Apply grease to the plug seal 5 in the adjusting nut 12 5 Grease the sealing groove and install the adjusting nut...

Page 56: ...g 10 on the top of the inserts 7 20 Install the adjusting nut 12 into the valve body 1 and tighten until snug and back off turn from the snug position 21 Apply thread compound Never Seez grease to the plug bolt 14 threads and tighten it with the allen wrench on the adjusting nut 12 side of the plug 6 22 Apply thread compound Never Seez to the threads on the SafeTap grease fitting 2 Install grease ...

Page 57: ...ter 4 and stop collar 5 Turn valve over so that the adjusting nut 14 is facing up Leaving the bottom plug bolt 1 in place screw out turning counter clockwise the adjusting nut 14 This will allow the entire internal assembly adjusting nut 14 plug 10 and inserts 12 to be removed from the valve pocket at once o Remove the plug bolt 1 that attaches the plug 10 to the adjusting nut 14 o Remove the plug...

Page 58: ...e fluid stream High flow rates Caustic or Acidic fluid streams High Temperature Fluid Streams that would act as solvents such as condensate High number of valve actuations Valves should not be greased while under pressure unless a Greaseal plug is being used In addition valves should not be disassembled for repair while part of an operating arrangement such as a manifold This should not be attempt...

Page 59: ...ngers to check for any raised edges and carefully sand as needed Severely damaged threads must be repaired at the factory On the pocket walls Scratches dings or pitting especially in the area immediately surrounding the valve bore Use your fingers to feel for any surface defects which may either fail to seal against the o ring or may even damage the o ring during assembly Check for any sharp edges...

Page 60: ...red inward trying to collapse the inside wall toward the bore Dimensions larger than these guidelines will produce walls too thin to support the working pressure of the valve and these parts should be scrapped Because the bore is larger than when new and because the eroded area tends to be uneven worn parts create a larger internal upset in the valve which increases turbulence This increased turbu...

Page 61: ... locked valve The SafeTap grease fitting allows for the safe relief of trapped pressure within a valve Extreme caution must be followed when attempting to relieve a pressure locking situation Slowly turn the grease fitting CCW turn to relieve the pressure Actuate the valve to ensure all pressure has been relieved After the removal of all trapped pressure you may remove all components See section 1...

Page 62: ...ing sealing surfaces it is VERY important to avoid sanding in one spot continuously sand evenly across the entire sealing surface Sand scratches by moving the sandpaper around the plug not up and down along the length of the plug If scratches cannot be removed utilizing this technique replace the parts If raised edges or dings in non sealing areas are too large to be sanded effectively you may use...

Page 63: ...lp you ensure a good hydrostatic test of the reassembled valve If you choose to mix old and new parts you must make absolutely sure that the old part does not have any defects Using 600 grit sanding cloth wet sand any surface blemishes as described in section 8 2 Sanding Tips See section 3 0 ASSEMBLY PROCEDURES for detailed assembly instructions ...

Page 64: ...e per 8 0 REPAIR AND INSPECTION Drain after testing All equipment should be drained and lubricated after testing and prior to storage All components and assemblies should be cleaned of dirt rust and other contaminants Rust Prevention Equipment should have exposed metallic surfaces protected with a rust inhibitor which will not become fluid and run at a temperature less than 125 F 52 C Sealing surf...

Page 65: ...maximum equipment shelf life of Months in Storage Manufacturers Recommendations 0 3 months Nothing required 3 6 months Re grease and operate Operate by rotating the plug Check to see that rotation is smooth without grinding or scraping 6 months Disassemble rebuild retest the valve Replace all internal seals ...

Page 66: ...MSI LT VALVE TECHNICAL MANUAL Revision D April 03 2014 66 10 0 ACCESSORIES Use only MSI recommended accessories MSI Part Number Description VC0393 Valve Operating Bar ...

Page 67: ...972 General Service size K Val Tex VC0426 972 General Service size 5 5 Val Tex VC0669 972 General Service size V Val Tex VC0527 750 Low Temperature size J Val Tex VC0402 750 Low Temperature size K Val Tex VC0357 700 CO2 Hi Temp Condensate size J Val Tex GREASE002 1502 S 7 Low Pressure Testing 7 lb can Val Tex Val Tex 1502 grease is for hand application only and not to be pumped Therefore it is to ...

Page 68: ... VALVE TECHNICAL MANUAL Revision D April 03 2014 68 10 2 GREASE REQUIREMENTS Valve Size Approximate amount of grease K size stick 1 VALVE STICK 2 VALVE STICK 3 VALVE 1 STICK 4 VALVE 3 STICKS 5 VALVE 5 STICKS ...

Page 69: ...CAL MANUAL Revision D April 03 2014 69 10 3 ACTUATORS MSI uses the following brands of actuators Information is available by clicking on the hyperlinks Pneumatic El O Matic Hydraulic Damcos Gear Operated Williams Machine ...

Page 70: ...MSI LT VALVE TECHNICAL MANUAL Revision D April 03 2014 70 10 4 RUBBER PRODUCTS MSI offers many 0 ring and plug seal materials for a variety of environmental and operating conditions ...

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