Adjustment Procedures; Example Of Piping - Yoshitake OB-3 Manual

7.5 Adjustment Procedures

If you adjust the product in a wrong way, hunting scale trouble, water hammer, etc. may occur or critical parts of
the product may be seriously damaged or, in some cases, destroyed. Therefore, make sure to follow the
procedures below and adjust correctly.
(1) Close the gate valves at the front and the rear of the temperature adjustment valve and blow the fluid from
the bypass for a sufficient period of time. After this, make sure to close the bypass valve. When blowing,
take special care so as not to increase the temperature higher than the heat resistance temperature. If the
temperature becomes higher than the heat resistance temperature, the bellows is damaged and the valve
shaft bends and becomes unusable.
(2) Turn the adjustment handle and align the indication board with the desired temperature position on the
scale board. If you turn the handle to the left (seen from above), the indication board comes up and the
desired temperature is increased. If you turn the handle to the right (seen from above), the indication board
goes down and the desired temperature is decreased. Note that the scale board merely indicates
reference and you need to watch the thermometer to adjust the temperature correctly.
(3) Slowly open the gate valve of the inlet side until fully opened, and then gradually open the gate valve of the
outlet side until fully opened.
(4) Taking sufficient time to carry out re-adjustment while watching the thermometer.

7.6 Example of piping

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■EPDT-258a■