7 Maintenance
73
7. Tighten the mounting nut with hands and give it 1/4 or 1/3 turn using the wrench
provided.
8. Check for leaking.
Q Checking for leaks
For the pressure regulator with needle valve
1.
Close the needle valve.
2. Open the valve of the gas cylinder. (Primary pressure is applied.)
3. Record the numerical value of the primary pressure at this time.
4. Close the valve of the gas cylinder.
5. Record the numerical value of the primary pressure after 10 to 15 minutes, and
check to see that it has not changed from the value recorded in step 3.
For the secondary pressure variable pressure regulator
1.
Turn the secondary pressure adjusting handle counterclockwise as far as it will go.
2. Open the valve of the gas cylinder. (Primary pressure is applied.)
3. Record the numerical value of the primary pressure at this time.
4. Close the valve of the gas cylinder.
5. Record the numerical value of the primary pressure after 10 to 15 minutes, and
check to see that it has not changed from the value recorded in step 3.
If a leak is detected, check the following items.
Table 1 Causes of pressure regulator leaks
Table 2 Replacement parts
Needle valve
Mounting nut
Cause of leak Countermeasures
Pressure regulator defect Replace the pressure regulator.
Leak in the cylinder connection
Replace the packing.
Tighten the mounting nut more.
Parts No. Parts name Specifications Pressure regulator model
F1000998300 Packing For WR-11 WR-11-XX
F1000998400 Packing For WR-13 WR-13-XX
* The packing depends on the pressure regulator model.
In purchasing the packing, be sure to confirm its model.
* In parts replacement, it is recommended that the gasket with ring to be
replaced into the packing without ring.
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