Instruction Manual

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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS

CAUTION: Only qualified personnel should undertake the procedures outlined in this document.

NIBCO INC., its agents, representatives and employees assumes no liability for the use of these

procedures. These procedures are offered as suggestions only.

NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224

NIBCO INC.

WORLD HEADQUARTERS

1516 MIDDLEBURY ST.

ELKHART, IN 46516-4740

USA

PHONE: 574.295.3000

FAX: 574.295.3307

WEB: www.nibco.com

Review Date: 01/18/2012

Original Date: NA

Installation and Maintenance Guidelines for

NIBCO

Cast Iron, Alloy Iron and Ductile Iron Gate Valves

2” to 24” Class 125, 150, 175 and 250

Figure Numbers

F-617-0

F-617-13

F-617-ON

F-637-31

F-637-33

F-667-0

F-619

F-619-N

F-639-31

F-639-33

F-607-OTS

F-609

Summary of content (10 pages)

PAGE 1
NIBCO INC. 1 5 1 6 M I D D L E B U R Y S T. PHONE: WORLD HEADQUARTERS E L K H A R T, I N 4 6 5 1 6 - 4 7 4 0 FA X : USA WEB: 574.295.3000 574.295.3307 w w w. n i b c o .
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1.0 GENERAL INFORMATION 1.1 SCOPE These instructions are furnished for use in the installation, operation and maintenance of NIBCO 2” to 24” Class 125, 150, 175 and 250 bolted bonnet solid wedge gate valves having handwheel operation. 1.2 GENERAL DATA A. MANUFACTURER NIBCO INC. 1516 Middlebury Street Elkhart, IN 46516 Phone: (574) 295-3000 B. FIGURE NUMBERS AND DESCRIPTIONS Cast Iron: F-617-0 Class 125, flanged end, rising stem, I.B.B.M., O.S.&Y.
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When more detailed information is required, the NIBCO catalog should be referred to using the valve figure number as the guide. D. SERVICE When installing valves for service in corrosive media, the NIBCO Chemical Resistance Guide may be consulted for specific data or contact can be made with NIBCO Technical Services. It is, however, the obligation of the user to make the ultimate decision of fitness for use. E.
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The body and bonnet are bolted together with bolts and nuts; and the joint is sealed with a non-asbestos gasket. Flow through the valve is stopped by forcing the wedge down between the seat rings which are screwed into the body. The wedge is the solid type and is guided through its entire travel by matching guides in the body. A. RISING STEM OS & Y GATE VALVE In NIBCO O.S.&Y. rising stem valves, the bottom of the stem screws into the wedge and is prevented from unscrewing by installing a solid wedge pin.
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2.0 INSTALLATION 2.1 PRELIMINARY INFORMATION Gate valves should preferably be installed with the stem pointed vertically upward. However, it is normally acceptable to have the valve stem pointed in a horizontal position either in vertical or horizontal piping. Although a gate valve will function satisfactorily in an inverted position it is not generally recommended because it allows fluids to become trapped in the bonnet cavity resulting in contamination and inability to fully drain the system.
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4.1 LEAKAGE THROUGH THE BONNET JOINT 1. Remove the handwheel from the stem. 2. Mark the body – bonnet flanges with a piece of chalk so they can be matched up later. 3. Remove body-bonnet nuts and bolts. 4. Carefully remove the bonnet assembly. Be careful not to nick or scratch the wedge seats. 5. Thoroughly clean the body and bonnet joint surfaces. 6. Check the body and bonnet gasket surfaces for any scratches or gouges or other irregularities. 7.
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and possibly reduce the amount of leakage. Critical to good valve performance is to keep the surfaces flat and not to change the angle of the wedge or body seats. 4.3 LEAKAGE THROUGH THE STUFFING BOX Leakage through the stuffing box packing may be stopped by tightening the packing nuts. Excessive tightening may cause difficult operation of the valve and could cause damage to the stem or packing nut. Do not over tighten. The adjustment should be just tight enough to stop the leak.
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5.0 MAINTENANCE 5.1 TOOLS AND EQUIPMENT Standard wrenches and tools are suitable for servicing valves as follows: A. For removing bonnet-body nuts and bolts a full set of 1/2” and 3/4” drive sockets is normally used. Pipe wrenches used on nuts or bolts have a definite crushing action which will deform them and is not recommended. B. A standard packing tool can be used and/or a blunt hook is sometimes used to remove packing rings.
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APPENDIX I Body to Bonnet Bolt Installation Procedure for NIBCO Cast Iron, Alloy Iron and Ductile Iron Valves The following procedure outlines the methods to be used in the assembly of and field installation of the body to bonnet bolts and nuts in order to assure the proper clamping stresses. The correct sequence and torque for tightening the body to bonnet bolts and nuts is also identified.
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IRON VALVE BOLT TORQUE Before tightening, make sure all surfaces that the fastener will contact are clean and dry. The torque tightening table listed below applies to clean, undamaged, non-lubricated threaded fasteners (lubricated threaded fasteners may require less torque – consult the fastener manufacturer for more detailed instructions). When tightening, use the sequence chart below. Tighten in two steps. 1. Tighten fastener using about 1/2 the final torque figure. 2.