Flowserve 800 Split-Wedge Gate Valve - Manual (Page 6)

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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 Installation
6.2.1 Although the valves have been shipped in a clean condition, prior to installing the valves, examine the lines
and the valve ports for foreign matter 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 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. Welding should be TIG with a
maximum interpass temperature of 300°F. These methods will prevent any seat warpage from high-
concentrated temperatures.
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 push/pull combined force on the handwheel rim. If the valve does not
close tightly, do not apply extra leverage; instead, refer to Paragraph 9.4 A and B.
800-lb. Split-Wedge Gate Valves FCD ADENIM0002-00