Operation Procedure; Precaution For Operation; Adjusting Procedure - Yoshitake GD-27BP Product Manual

Pressure reducing valve with by-pass

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Warning

1. Before leading fluid into the product, switch the product function to by-pass function and remove

foreign substances and scale from the piping completely.

* 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 valve. If water remains in by-pass line, remove the plug and discharge water.

* Failure to follow this notice may cause malfunction of the product due to rusting inside the product

and the pipes.

(See "4. Structure" on Page 6 and "9. Exploded view" on Page 16.)

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 stop valve at inlet side of the product.

2. Turn stem to switch the product function to by-pass function.

3. Open stop valve at inlet side of the product and blow out fluid enough.

 When reduced pressure exceed set pressure it is dangerous since safety relief valve at outlet side of

the product blows out. Regulate opening of stop valve at inlet side so that reduced pressure do not

exceed set pressure.

4. Close stop valve at inlet side of the product.

5. Turn stem and switch the product function to pressure reducing function.

6. Slowly open stop valve at inlet side of the product fully.

7. Remove domed cap nut [40], and turn adjusting screw [32] while watching the pressure gauge at the

outlet side.

 Turn the adjusting screw to the right (clockwise) to increase reduced pressure.

 Turn the adjusting screw to the left (counterclockwise) to decrease reduced pressure.

After the adjustment is complete, tighten domed cap nut [40].

7. Operation procedure

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.

Caution

EPDT-278

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