Hancock 1500, 2500 and 4500 Pound Forged ... - Industrial Controls

TABLE 2—Suggested Backseating TorquesTorque - Ft. Lbs. { ±0 }1500 Class 2500 Class 4500 Class1/4 15 15 153/8 15 15 151/2 15 15 153/4 20 20 201 20 20 201-1/4 75 75 751-1/2 75 75 752 75 75 75Valve SizeTABLE 3—Suggested Seating TorquesTorque - Ft. Lbs.{ +25% }Valve Size-01500 Class 2500 Class 4500 Class1/4 25 25 303/8 25 25 301/2 25 25 303/4 30 35 601 30 35 601-1/4 100 150 2001-1/2 100 150 2002 100 150 200If the valve is leaking when properly torqued,opening the valve and reclosing mayflush out foreign material trapped onthe seats. Do not use a wrench toclose the valve. If the valve will notshut off tightly when seating surfacesare free of foreign material, refinishingof the seat and disc is indicated.close valveD. HandlingHancock/Yarway Tee Pattern/Angle Valves aredurable and rugged, and require no special handling.E. Storage! ATTENTIONDo not exceed specifiedtorques, or use a wrench toIndoor storage of valves is recommended, however,if prolonged storage is inticipated, the valvesshould be stored in a humidity controlled storagearea. The end protectors on the valves should betightly in position to prevent contamination andshould remain in place until immediately prior toinstallation in the line. Further, gland nuts shouldonly be hand tight during storage.If valves are ordered to a more stringent cleaningand storage procedure, the recommendations inthat procedure should be followed.F. Pre-installationPrior to installation, the following steps should betaken:1. Leave end protectors in place until readyfor installation, then remove.2. Inspect both ports for obstruction or foreignmaterials. Clean when necessary.3. Valves are shipped with the gland nuts loose.These nuts must be tightened ! ATTENTIONbefore putting the valve in service.Operate the valve to determinewhether the packing glandnuts are tight, a firm dragbetween the stem and the packingshould be felt. If necessary,Tighten gland nuts beforeplacing valve in service.retighten the gland nuts until the drag is firm.4. If packing is not installed in the valve, refer tothe Maintenance instructions (Section 4.L) inthis manual for packing installation directions.G. WeldingThese valves should be in the midopenposition prior to welding. Careshould be taken not to ground thevalve yoke, stem or the tee handle.Maintain 350°F interpass temperaturerequirement when installing stainlesssteel valves.H. InstallationThe Tee Pattern Globe/Angle Valvemay be installed with the stem in positionrelative to the horizontal or verticalplane. However, the flow path asmarked by the arrow on the body Ensure that arrow on globevalve points in same directionas normal flowmust be maintained.After the valve is welded in line, the packing glandnuts should be tightened. Further, after the systemstart up, and when the valve has reached itsexpected operating temperature, the gland nutsshould be checked and adjusted as necessary toensure proper tightness. This precaution is due topossible loss of packing vloume from “off gasing” oflubricants and impurities in the packing.I. Packing Leakage! ATTENTIONDo not ground to yoke, stem ortee handle when welding.! ATTENTIONIf packing leakage is discovered early and it is notsevere, nor is severe stem pitting present, leakagemay be stopped by tightening the packing glandnuts. Tighten the nuts by rotating them clockwise,alternating 1/2 turn on each nut. Using an alternatetightening sequence will help insure that the glanddoes not cock and bind stem. If leakage stops aftertightening, rotate the stem clockwise or counterclockwise1’2 turn using the valve tee handle. If thepacking load required to stop leakage causes stembinding, this indicates that severe stem pitting, or5