Flowserve 1888 Double-Disc Gate Valve - Manual (Page 9)

6.0 INSTALLATION INSTRUCTIONS
6.1 Lifting and Handling Requirements and Limitations
6.1.1 Good judgment should be exercised in selecting a lifting device that will safely support the unit’s weight.
6.2 Assembly Instructions
6.2.1 The valves have been shipped in a clean condition. Examine the lines and the valve ports for foreign matter
prior to installation and clean them thoroughly if they have been exposed to the elements; (BEFORE
CLEANING IN THIS FASHION, CHECK AT THE SITE TO SEE IF A SPECIFIC CLEANING PROCEDURE
SHOULD BE FOLLOWED.) Open the valves fully and flush them out with water, if possible; otherwise, blow
them out with air or steam.
In performing this cleaning procedure, the ports should be vertical and the stem horizontal to assure
complete removal of all matter that might have accumulated during storage.
6.2.2 Ensure that there is no line sag at the point of installation. Eliminate any pipeline deviation by the proper
use of pipeline hangers or a similar device.
6.2.3 Where possible, install the valves with the stem vertical. When other orientations are used, take care when
disassembling the valve to avoid any internal damage.
6.2.4 Remove the end protectors and clean the socket weld ends or, in the case of butt weld end valves, clean
with a solvent such as acetone in preparation for welding the valve into the line. The valves should then be
blocked or slung into position with an apparatus that is sufficient to hold the valve assembly weight while
the valve is being welded into the line. WELDING MUST TAKE PLACE WITH THE DISC IN THE
OPEN POSITION.
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 80 Ibs. of push/pull combined force on the tee handle. If the valve does not close
tightly, do not apply extra leverage; instead, refer to Paragraph 9.4 A and B.
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1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00