Warning And Caution For Operation; Piping Example; Adjusting Procedure - Yoshitake GD-26G Product Manual

4.2 Warning and caution for operation

When the product is used for hot fluid, do not touch the product with bare hands.
* The product having hot fluid may scald your skin.
1. Before leading fluid into the product, close the stop valves at the inlet and outlet of the product and
remove foreign substances and scale from the piping completely by using a bypass line.
* Failure to follow this notice may prevent the product from functioning properly due to the ingress
of foreign substances and scale into the product.
2. To adjust the set pressure, turn the adjusting screw slowly.
* Failure to follow this notice may result in damage to the product and other equipment due to
hunting or other cause.
3. When the product is not used for an extended period, completely discharge fluid from the product
and pipes, and close the stop valves at the inlet and outlet sides of the product.
* Failure to follow this notice causes malfunction of the product due to rusting inside the product
and the pipes.

4.3 Piping example

By-pass
Inlet side

4.4 Adjusting procedure

Following a wrong adjusting procedure may cause hunting, scale problems or other problem, and can
heavily damage the main parts of the valve. To avoid these problems, be sure to follow the procedure
given below.
1. Close the stop valves at the inlet and outlet sides of the reducing valve, and take adequate time to
blow out fluid by using a bypass line. In doing this, adjust the opening of the globe valve in the by-
pass pipe so as not to blow out the safety relief valve. After the end of blowing, close the globe
valve without fail.
2. Fully open the stop valve at the inlet side slowly, and open the stop valve at the outlet side so that
a little fluid can flow through.
3. Remove the domed cap nut and turn the adjusting screw [14] while watching the pressure gauge
at the outlet side.
Turn the adjusting screw to the right (clockwise) to increase the reduced pressure.
Turn the adjusting screw to the left (counterclockwise) to decrease the reduced pressure.
4. Fully open the stop valve at the outlet side slowly.
5. After the adjustment is complete, tighten the domed cap nut.
Pressure gauge
Stop
valve
GD-26GS
Warning
Caution
Globe valve
Stop
valve
8
Pressure
gauge
Safety valve
Outlet side
■ EP D T-088■