10633 W Airport Blvd. STE 200
Chaoda Group USA Co., LTD
Tel: +1 (832) 939-9944
Stafford, TX 77477
Fax: +1 (832) 939-9942
Pa
ge
15
Chaoda Group USA Co., LTD
4. Maintenance
1. After installation and the pressure test of the pipeline or the system, the ball must
be fully opened or fully closed.
2. Dust, grease and medium residual tend to accumulate at the surfaces of the body,
and moving parts such as stem, gearbox, the guide of the yoke, etc., wear and erode
the valve, and even generate friction heat that is dangerous in an explosive
atmosphere, and shall be cleaned frequently according to the working conditions.
3. After putting into service, the valve shall be checked and maintained periodically
especially for the condition of seating surfaces and, the age of packing, and the
corrosion of the body. In the event that sealing will be impaired, the valve shall be
repaired or replaced. It is suggested that the inspection and maintenance of the valve
shall be performed every three months provided the fluid is gas, water or oil. For other,
more abrasive media, at least once a month is recommended.
4. When performing Repair/maintenance operations, the user shall use valve O-rings,
gaskets, bolts, and nuts of the same size and material as the original ones. Valve O-
rings and gaskets may be (alignment of all of this)ordered as spare parts for
maintenance and replacement. It is forbidden to open the closure or replace the bolts,
nuts or O-rings when the valve contains pressure. After replacement of O-ring, gasket,
bolt, and nut, the valve shall be closure test prior to reuse.
5. If stem leak develops inject sealant via emergency sealant injection fitting. If the
stem leakage cannot be stopped then replace of stem packing is necessary.
6. If the body seal leak develops, do not overtighten the body end cover stud and nuts.
This may damage the valve. Instead, the body seal should be removed and replaced
by disassembling the affected end connection
