Yoshitake GD-200 Series Manual page 10

６．２ Precautions before operation
Caution
(１) Since it is weight thing, this product should use lifting equipment etc.,
and please support a product certainly and install it in piping.
※There is a possibility that it may be injured, by fall of product.
(２) Do not disassemble the valve unreasonably.
※ Disassembling the valve at your discretion may affect the original
performance.
(３) Remove foreign matter and scales from the lines before connecting the valve.
※Failure to do so may prevent the valve from functioning correctly.
(４) Install a strainer at the valve inlet side.
※Failure to do so may hamper correct pressure control, which affects the
original performance.
※By sunshine or atmosphere temperature rise, the fluid in piping carries
out volume expansion, failure of the valve and the external leak of fluid
occur, and there is danger of circumference contamination.
(５) Install a safety valve at the valve outlet sides for alarms.
※Failure to do so prevents problem identification, resulting in equipment
damage.
(６) Install a pressure gauge at both the inlet and outlet sides of the valve.
※Failure to do so may hamper correct pressure adjustment.
(７) For gas application, install a trap to the inlet sides of the valve to prevent
drainage problem.
※Failure to do so may result in drainage problem, affecting the original
performance.
(８) When installing quick open and close valves, such as a solenoid valve, secure
at least 3 m from the valve.
※Failure to do so may result in malfunction or drastically shortened
service life.
(９) When reducing pressure in two stages, secure at least 3 m between the valves.
※ Failure to do so may result in malfunction, affecting the original
performance.
(10) Install the valve in proper direction of the fluid flow.
※Failure to do so may affect the original performance.
(11) Do not apply excessive load, torque or vibration to the valve.
※Doing so may result in malfunction or drastically shortened service life.
(12) Pipes can be installed either horizontally or vertically except over the
size of 100A.
(13) The safety valve should be set as described below.
Setting pressure of a reducing valve (MPa)
0.8 and above
Table 6 Safety valve setting pressure table
0.1 or less
0.11-0.4
0.41-0.6
0.61-0.8
-9-
Setting pressure of a safety valve (MPa)
Setting pressure of a reducing valve
Setting pressure of a reducing valve
Setting pressure of a reducing valve
Setting pressure of a reducing valve
Setting pressure of a reducing valve +15%
+0.05 or more
+0.08 or more
+0.1 or more
+0.12 or more
■EPDT-096b■