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 .
1.0 GENERAL INFORMATION 1.1 SCOPE These instructions are furnished for use in the installation, operation and maintenance of NIBCO 2” to 24” service rated for 175, 250 and 300 WWP bolted-bonnet, solid-wedge or resilient-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-607-OTS WWP 175, Class 125 flanged end, rising stem, I.B.B.M., O.S.&Y.
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. PRESSURE TEMPERATURE RATINGS Pressure and temperature ratings may be found in the Engineering section of the latest printing of NIBCO catalog. This information is taken from applicable ANSI Standards. F.
The wedge is raised and lowered in the waterway by rotating the handwheel which is attached to the yoke bushing. The handwheel fits onto the hex end of the yoke bushing and is held on by the handwheel nut which is threaded onto the top of the yoke bushing. The inside diameter of the yoke bushing has threads that mate to the upper stem threads. The yoke bushing is held in the top of the bonnet by the bonnet cap against the rim on the bottom of the yoke bushing.
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.
4.0 TROUBLESHOOTING Prior to doing any work on any NIBCO valve, it will be necessary to shut down the piping system, remove pressure and drain, and if necessary, allow cooling and/or decontaminating before proceeding. 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.
Repacking of valves under pressure is not a recommended practice. Prior to proceeding to change packing, it will be necessary to shut down the piping system, remove pressure and drain, and if necessary, allow cooling and/or decontaminating before working on the valve.
6.0 SPARE PARTS Normal spare parts to be maintained on hand are listed on the NIBCO spare parts list. If the bonnet or body is damaged, it is normally less expensive to remove the entire valve from the line and install a new one. When placing an order for spare parts, it is necessary to give the size, the valve figure number found on the aluminum identification plate and also heat numbers, part numbers, and date code numbers which are generally cast into the valve body on its side.
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.
7/8” bolts 1” bolts 24” wrench 36” wrench 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.
