Installation and Maintenance | 1154A Wafer Valves
INSTALLATION and MAINTENANCE INSTRUCTIONS
Flange and Pipe Compatibility: 1154A Valves are used between all types of ANSI Class 125 and Class 150 flat or raised face flanges. Flange gaskets are unnecessary as 1154A Valve seat face design eliminates the need for gaskets. Lined pipe, heavy wall pipe, or flanges must have a minimum allowable inside diameter "K" (see page 4) at the centered body face to clear disk sealing edge when opening valve. Installation Information: 1154A Valves are bi-directional and will control flow equally well in either direction. For best results in dirty service, position the valve assembly to have stem in horizontal position and lower disk edge to open in downstream direction. To install valve between existing ANSI flanges, flanges must be spread sufficiently before placing valve in position to prevent distortion and/or damage to the sealing face of seat. In new construction using ANSI welding type flanges, the following method of installation has proven beneficial. With the disk in nearly closed position, center each companion flange bore to the body face bore, span valve body with flange bolting, and make-up the bolting. Use flange-body-flange assembly for fit-up and centering to pipe. Tack weld the flanges to pipe. Remove bolting and valve assembly from between flanges. Important: Do not finish weld the flanges to pipe with valve bolted between flanges as this will result in serious heat damage to seat. Finish welding the flanges to pipe and allow flanges to cool completely. Installation Instructions: Observe that the disk sealing edge is in line with keyway in stem. Rotate stem clockwise to position disk within body at least 3/8 " away from body face. After spreading the flanges, center valve body between flanges and span valve body with all flange bolts possible. Turn disk to full- open position. Next, maintain the valve to flange alignment while gradually removing the flange spreaders and tightening flange
bolting handtight. Slowly close the valve clockwise to check for adequate disk clearance. Return the disk to the full-open position and cross-tighten all bolting to proper torque specification. Again, check for adequate disk clearance. If installation is satisfactory, valve is ready for service after installing valve operator or actuator.
Maintenance: Routine maintenance or lubrication is not required.
♥ Valve Disassembly: Turn disk to the almost open position. Proceed by removing operator or actuator, disk screws with "O" rings, stem, packing and bushing. Remove disk by pulling or "rolling" the disk out of seat bore. To remove seat from body, pry under both seat edges at one point, collapse seat into the shape of a round bottom heart configuration ( ), and pull the seat out of body bore. Discard parts to be replaced. Valve Assembly: Clean all reusable parts. If possible, use silicone- base oil or lubricant to facilitate assembly. Collapse seat into the shape of a round bottom heart configuration ( ), firmly place "bottom" part of seat into position taking care to align lower stem holes, snap seat into position within the body, and check all stem holes for proper alignment. Install disk with the screw holes toward body top plate and align stem holes. Install packing, bushing, and stem. Use a rotary downward pressure on stem to facilitate assembly while paying particular attention that the seat is not damaged due to any misalignment of stem holes. Align the counterdrilled portion of the stem screw holes with disk screw holes. Place "O" rings on disk screws. Install disk screws and tighten securely. ♥ Repairs: 1154A Valves are field repairable. If in time it is necessary to replace certain parts, valve must be removed from the line. Proceed by turning disk to the nearly closed position, loosen all flange bolting, remove necessary bolting, spread the flanges if necessary, and remove valve from between flanges.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
Bulletin 1154A Page 4
Made with FlippingBook flipbook maker