Flowserve 1888 Parallel Slide Gate Valve - Manual (Page 6)

6.3 Pre-Operational Checks
6.3.1 After installation the operation of manual valves should be verified by
closing the valve. The valve should seat tightly with less than 60 lbs.
of force on the handwheel rim. If the valve does not close tightly do
not apply extra leverage; instead refer to Para. 9.4 A and B.
7.0
MAINTENANCE REQUIREMENTS
7.1 Preventive Maintenance
7.1.1 Check all nuts and bolts periodically to ensure tightness and to
forestall 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.
8.0
PERIODIC INSERVICE TESTING RECOMMENDATIONS AND PROCEDURES
8.1 It is recommenced that the valve be operated from full open to full close at
least once every six months.