Precautions For Installation - Yoshitake GD-46 Series Instruction Manual

９ ．２ Precautions for installation
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CAUTION
（１）Do not disassemble the reducing valve unless it must be disassembled.
※The product has been strictly inspected at the factory. Incorrectly disassembled, the
reducing valve cannot function, as it should.
（２）Before connecting the reducing valve to the piping, remove the foreign materials from the
piping.
※If foreign materials are introduced into the reducing valve, it cannot operate as it should and
may be damaged.
（３）When installing, check the direction of the reducing valve so that the fluid flowing and the arrow
marked on the valve body are in the same direction. The product can be installed vertically or
horizontally.
※If installed in opposite direction, the reducing valve cannot function as it should.
（４）When installing, pay attention inclination (pipe misalignment) and face-to-face dimention.
（５）When the reducing valve is used in hot water line, take proper measures against thermal
expansion and contraction of the piping.
※Applying hot water to the reducing valve without any proper measures damages the valve
resulting in outside leakage.
(Ref.: Expansion coefficient of stainless steel pipe 17.3×10
（６）When installing GD-46□□C type with the check valve, be sure to attach the supplied joint with
internal check valve to the outlet side of the reducing valve.
※If the joint is installed at the inlet side, the fluid cannot flow.
（７）Secure at least the space specified in "Space required for disassembly and inspection" shown
below.
※Larger the space, easier the maintenance and inspection works.
（８）When piping synthetic tube like polyvinyl chloride, never introduce the adhesive material into
the product.
※The adhesive material can cause the clogged strainer or damaged synthetic rubber, which
may degrade the product performance.
（９）Installing guidance on the product with internal tube end core
①Do not expose the product close to the fire or hot temperature from the welding work.
※ The end tube core may be thermally deformed and fail to operate as designed.
②Female joint in the core
Water supply lining steel pipe is either "Vinyl chloride lining steel pipe for city water" or
"Polyethylene resin lining steel pipe". The end tube core in the product can accommodate
pipes of both types.
③Cutting the pipe
When cutting the pipe, the cutting angle must be perpendicular to the length of the pipe.
Use an automatic metal sawing machine, automatic circular sawing machine, or the like.
Notes:１．Do not use pipe cutter or gas cutting, arc cutting or high-speed wheel cutting
④Chamfering the pipe
Plane the burrs off the pipe inside using a chamfering tool such as scraper.
⑤Threading the pipe
Cut threads on the pipes according to JIS specifications. Verify the thread by using a
screw-thread gauge.
※Note that a screw-thread smaller than the specified value may damage the core.
⑥Applying seal material
Apply corrosion resistant seal material evenly to the male threads of the pipe and the pipe
end.
⑦Connecting pipes
When jointing pipes, refer to the standard number of screwed threads and thread depth shown
below.
technology.
２．Completely remove oil from the pipe.
※ The oil may damage the synthetic rubber, degrading its performance.
－8－
-3
mm/m/℃)
■EPDT-166f■