OMB Valves S.p.A
. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy
Tel: +39 035 4256711
Fax: +39 035 942638
www.ombvalves.com
19
CAUTION
OMB Supporting Procedure
:
SV-014-PWHT API 602 Forges Steel Valves Procedure
•
Before starting disassembly be sure enough, space is available to proceed the operation freely.
•
Segregate different components in accordance with their materials of construction (metal, graphite, plastic,
electrical, etc.)
•
Bodies, bonnets, wedges gland flanges and Handwheels are in forged steel materials, and the remaining
components such as stems, seats, glands and bolting are in steel bars.
•
Gaskets and packings are composed of graphite or PTFE materials.
•
Standard gaskets used in bolted bonnet valves are spiral wound type in stainless steel 316 and pure graphite.
•
Standard packing is composed of a series of rings of pure graphite. The sets can be supplied with two anti-
extrusion rings, top and bottom, manufactured in braided graphite. Both internal and external rings are treated
with a passive corrosion inhibitor.
•
Bonnet-type small valves are simply disassembled by unscrewing the union nut or bonnet.
•
Bolted-bonnet valves are disassembled by removing bonnet nuts, stud bolts and/or turning cover/screw cap,
counter-clockwise until cap is removed.
