Flowserve 1878 Double-Disc Gate Valve - Manual (Page 9)

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7.0 MAINTENANCE REQUIREMENTS
7.1
Preventive Maintenance
7.1.1 Check all nuts and bolts periodically to ensure tightness and to foretell
possible leaks. Recommended torque values are presented in Section 11.0.
7.1.2 Keep valve stem clean and properly lubricated.
7.1.3 Check conditions of packing and replace as necessary.
7.2
Recommended Spare Parts
7.2.1 Recommended spare parts are gaskets, packing, disc pack and stem. The
recommended quantity is one (1) set of packing and gaskets for every two
(2) valves of a particular type but not less than 1 set of each type. One disc
pack and 1 stem is recommended for every ten (10) valves of a particular
type.
7.3
Lubrication
7.3.1 Apply a light coating of lubricant (Dow Corning Molykote 111 Compound,
Dow Corning Molykote P37 paste or equal) when necessary to the threaded
area of the stem.
7.3.2 The bearing area in the yoke bushing can be lubricated via the grease fitting
(340) with the above mentioned lubricants.