Swagelok BSH 10 Series, User Manual, Page: 6 / 20

6
Operation
Required Tools for Operation
- A 19 mm open-ended wrench is required for changing the set pressure on a standard regulator.
- A 19 mm and 32 mm open-ended wrench are required for anti-tamper regulators.
Points of Attention Before Operation
CAUTION
The product can be hot or cold, depending on the environmental temperature and the process
media temperature. Take the necessary precautions before operating or touching the product.
-
Once the regulator closes, after being open to flow, the inlet pressure may fall a little under the set
pressure. This is usually referred to as
“reseat pressure”
. This phenomenon does not indicate a
problem with the regulator.
- An increase in the flow may result in a rise of the set pressure. A decrease in the flow may result in a fall
of the set pressure. This is usually referred to as
“accumulation”.
This phenomenon does not indicate a
problem with the regulator.
- An increase of the outlet pressure may result in a fall of the set pressure. A decrease of the outlet
pressure may result in a rise of the set pressure. This is usually referred to as
“dependency”
. This
phenomenon does not indicate a problem with the regulator.
Adjusting the Set Pressure
- The set pressure is the desired upstream pressure of the regulator.
- To set the regulator, ensure that the supply pressure is greater than the required set pressure but does
not exceed the maximum rating of the regulator.
- The regulator must be able to flow in order to adjust the set pressure.
1. Open any downstream valve.
2. To operate the regulator, turn the adjusting screw clockwise to increase the set pressure. Turn the
adjusting screw counterclockwise to reduce the set pressure.
3. Partially open the supply valve to allow the regulator to sense the inlet pressure with minimal flow.
4. Close the supply valve and verify the set pressure by measuring the regulator inlet pressure.
5. Make adjustments to the set pressure as required and repeat steps 3 and 4
6. To obtain the most accurate set pressure, final adjustment
must be made while increasing the set
pressure. If the desired set pressure is exceeded, reduce the pressure below this value then increase up
to it.
7. Once the regulator is set, the supply pressure can be adjusted to its normal working value.
8. Open the supply valve fully to allow full flow during operation.
9. When
in operation make any final set pressure adjustments if required.