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NIBCO Technical Services • Phone: 1.888.446.4226 • Fax: 1.888.336.4226 

VALVE INSTALLATION GUIDELINES CONTINUED 

 

Butterfly valves should be installed a minimum of six (6) pipe diameters from other line components 
and changes in direction in both the upstream and downstream piping.  This assures disc clearance 
when opening the valve and reduces internal stress on disc by reducing flow turbulence.  While not 
always practical, it is important to design in as much straight distance on either side of the butterfly 
valve as possible. 

 

NIBCO butterfly valves are bi-directional and may be installed with flow in either direction.  These 
valves can be installed in any horizontal or vertical position. If a choice of stem positions exists, the 
valve should be installed with the stem in the horizontal position; this will minimize seat wear by 
distributing the stem and disc weight evenly. Also, if the media is abrasive, the horizontal stem 
position is highly preferred, which will allow the disc to act as a “scoop” to sweep the line of the 
media when operated. 

 

When using a valve with gear operator attached, it may be desirable to have the hand wheel 
positioned to allow easy access, or for use of an optional sprocket rim (chain wheel) for remote 
operation. It is the responsibility of the installer to determine if a Retaining Harness is needed when 
using a chain wheel.  Before valve installation, review how to orient the gear operator hand wheel 
position in relation to the valve body and piping system. Pre-planning may save from having to 
remove a newly installed valve and reinstalling in another orientation. 

 

Open and close the butterfly valve fully before attempting to install it into a piping system to ensure 
the gear operator stops are properly set and the valve is fully functional.  If the gear operator is 
removed from the valve for any reason, prior to or during installation, the gear operator stops must 
be properly reset as per Section IV, on page 5. 

 

III. VALVE INSTALLATION PROCEDURE 

 

Always position the connecting pipe flanges accurately in the line, allowing sufficient space between 
the flanges for the valve. Make sure the pipe flange faces are clean of any foreign material such as 
scale, metal shavings or welding slag. Valves should be installed with the disc in the closed position 
to prevent damage to sealing surfaces. Rubber seated butterfly valves have an integral rubber face 
that seals to the attaching flanges, therefore 

separate gaskets should not be used

 

1.  Fully close valve and inspect to assure disc is centered equally in the seat.  Adjust gear operator 

CLOSE stop if necessary, to center disc in seat.  See Section 

IV 

on page 5. 

2.  Carefully insert the valve between the pipe flanges. Do not apply any lubricants to the seat faces 

as this may damage them. 

3.  Line up, center & secure the valve between flanges using 

customer supplied

 desired bolts as 

listed in 

TABLE 2 

on next page. Do not tighten bolts at this time, hand tighten then “snug-up”. 

4.  Carefully open the valve to assure free unobstructed disc movement. Disc interference may 

result when valves are installed in pipelines having smaller than normal inside diameters, such 
as heavy wall pipe, plastic-lined pipe, as-cast flanges, or reducing flanges. Interference can also 
occur when connecting directly to a swing check or silent check. Suitable corrective measures 
must be taken to remove these obstructions, such as taper boring the pipe or installing a spacer 
or spool piece. 

5.  After proper operation is verified, tighten the bolts to the

 minimum

 recommended bolt torques 

listed in 

TABLE 3

, next page, using a cross-over pattern as shown in 

FIGURE 1

, next page.  

6.  A multi-stepped process utilizing the cross-over pattern should be used to draw flanges against 

the rubber seat from both sides of the valve at the same rate, ensuring even compression.  This 
should be followed by 2 sets of chase patterns, alternating from one side of the valve to the 
other.  Refer to 

ASME PCC-1 GUIDELINES FOR PRESSURE BOUNDRY BOLTED FLANGE 

JOINT ASSEMBLY

 for bolt tightening methodology.  

7.  Pressurize piping to valve and inspect for leakage. If leakage is observed, tighten bolts using 

cross-over pattern, increasing torque until leak stops. 

DO NOT EXCEED MAXIMUM TORQUES

 

LISTED IN

 

TABLE 3

 on next page. 

8.  Recommended torques are made without warranty. Installer must verify proper strength bolts 

for application. 

Содержание LD-3000 Series

Страница 1: ... U A R T E R S 1 5 1 6 M I D D L E B U R Y S T E L K H A R T I N 4 6 5 1 6 4 7 4 0 U S A P H O N E 5 7 4 2 9 5 3 0 0 0 FA X 5 7 4 2 9 5 3 3 0 7 W E B w w w n i b c o c o m Review Date NA Original Date 3 23 2022 USA ONLY Installation and Maintenance Guidelines for NIBCO Flanged Butterfly Valves with Rubber Seats Figure Numbers LD 7000 Series LD 3000 Series Pressure Rating 232 psi 16 Bar CWP LD 7000...

Страница 2: ... used when selecting mating components for use with NIBCO flange style butterfly valves The internal diameter of flanges fittings and pipe must be compatible with the butterfly valve for proper seal face integrity and disc operation When in the open position the disc extends outward from the valve body The internal diameter of connecting components must be large enough to allow clearance for the d...

Страница 3: ...e between the flanges for the valve Make sure the pipe flange faces are clean of any foreign material such as scale metal shavings or welding slag Valves should be installed with the disc in the closed position to prevent damage to sealing surfaces Rubber seated butterfly valves have an integral rubber face that seals to the attaching flanges therefore separate gaskets should not be used 1 Fully c...

Страница 4: ... 1 44 1 44 3 32 1 8 UNC 18 4 12 1 56 1 56 3 32 1 1 8 7 UNC 20 5 14 1 69 1 69 3 5 40 1 1 8 7 UNC 24 5 98 1 88 1 88 4 40 1 1 4 7 UNC 30 6 57 2 12 4 25 56 1 1 4 7 UNC 2 94 5 56 36 8 00 2 38 5 64 1 1 2 6 UNC 3 56 6 64 42 9 88 2 62 5 25 72 1 1 2 6 UNC 3 81 6 5 72 48 10 87 2 75 5 5 88 1 1 2 6 UNC 4 25 7 88 TABLE 2 TABLE 3 BOLT GRADE BOLT HEAD MARKING LUBRICATED BOLT SIZE NON LUBRICATED BOLT SIZE 1 8 1 7...

Страница 5: ... it stops 11 Tighten CLOSE stop nut until it is tight or install outer set screw and tighten 12 If the valve is installed in the system piping and cannot be removed it is possible to adjust the stops but is a little more difficult The only difference is that instead of visually checking the actual disc in the valve you must visually check the pointer position Because the exact pointer position is ...

Страница 6: ...NIBCO Technical Services Phone 1 888 446 4226 Fax 1 888 336 4226 6 GEAR OPERATOR FOR 14 SIZE BUTTERFLY VALVES FIGURE 2 GEAR OPERATOR FOR 16 THRU 24 SIZE BUTTERFLY VALVES FIGURE 3 ...

Страница 7: ...chnical Services Phone 1 888 446 4226 Fax 1 888 336 4226 7 GEAR OPERATOR FOR 30 36 SIZE BUTTERFLY VALVES FIGURE 4 GEAR OPERATOR FOR 42 48 SIZE BUTTERFLY VALVES FIGURE 5 OPEN STOP CLOSE STOP OPEN STOP CLOSE STOP ...

Страница 8: ... mm mm 63 35 18 67 35 18 X 11 X 80 140 18 197 86 0 480 404 560 24 INCHES 2 756 0 787 2 93 784 X 472 X 3 15 10 00 0 71 10 87 3 39 22 13 18 15 26 57 600 mm mm 70 00 20 74 50 20 X 12 X 80 254 18 276 86 0 562 461 675 VALVE SIZE UNITS L M N O P Q R QTY U THREADS T GEAR MOUNT WEIGHT 14 INCHES 13 15 3 62 3 94 20 98 18 75 12 87 24 1 8 UNC 1 18 F10 220 lbs 350 mm mm 334 0 92 100 533 476 3 327 30 100 Kg 16 ...

Страница 9: ...000 7 1 DISC DUCTILE IRON A536 65 45 12 NYLON 11 COATED ALUM BRZ ASTM A148 C95400 STAINLESS STEEL CF8M 8 2 TAPER PIN STAINLESS STEEL ASTM A276 S42000 STAINLESS STEEL ASTM A564 S63000 9 1 SEAT EPDM ASTM D2000 NITRILE ASTM D2000 10 2 BUSHING LONG BRONZE ASTM B584 C83600 11 1 BODY DUCTILE IRON ASTM A536 65 45 12 12 2 STUD STEEL 13 2 NUT STEEL 14 1 PACKING RING BRONZE ASTM B584 C83600 15 2 V CUP PACKI...

Страница 10: ... 16 X 140 356 33 415 150 1044 864 1180 48 INCHES 4 724 1 260 5 28 1 260 X 709 X 5 50 14 02 1 30 16 34 5 91 44 37 37 44 53 07 1200 mm mm 120 32 134 32 X 18 X 14 356 33 415 150 1127 951 1348 VALVE SIZE UNITS L M N O P Q R QTY S THREADS T GEAR MOUNT WEIGHT 30 INCHES 29 33 6 57 7 09 38 74 36 00 29 09 56 1 7 UNC 2 13 F30 1109 lbs 750 mm mm 745 167 180 984 914 4 739 54 504 Kg 36 INCHES 34 06 7 99 8 31 4...

Страница 11: ...INIM 9 1 ROLL PIN STEEL 24 2 KEY STEEL 10 2 SPACER STEEL 25 8 SCREW STEEL 11 1 THRUST BEARING STEEL 26 8 WASHER SPRING STEEL 12 4 BUSHING SHORT BRONZE ASTM B584 C83600 27 8 NUT STEEL 13 2 O RING NITRILE ASTM D2000 28 1 TOP CONNECTION SPT DUCTILE IRON A536 65 45 12 14 1 STEM LOWER STAINLESS ST ASTM A276 S42000 29 1 PACKING RING BRONZE ASTM B584 C83600 STAINLESS ST ASTM A564 S63000 30 4 V CUP PACKIN...

Страница 12: ...T GEAR OPERATOR OR ACTUATOR CLOSE STOP SEE SECTION IV CONTAMINATION ADHERED TO SEALING SURFACES OF SEAT CLEAN BOTH SEALING SEAT SURFACES RUBBER SEAT HAS ERODED CHECK MEDIA TO SEE IF COMPATIBLE WITH RUBBER SEAT MATERIAL EXTERNAL LEAKAGE AT LOWER STEM END CAP O RING DAMAGED REPLACE O RING RETAINING COVER O RING DAMAGED REPLACE O RING ADJUSTING SCREW O RING DAMAGED REPLACE O RING EXTERNAL LEAKAGE AT ...

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