You adjust a check valve by inserting a large flat-blade screwdriver into the outlet side and turning the plastic screw. Clockwise rotation increases the check height, while counter-clockwise rotation reduces it.
Here's a more detailed breakdown:
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Identification: Locate the adjustment screw on the outlet side of the check valve. This screw is typically made of plastic.
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Tools Required: You will need a large flat-blade screwdriver that fits snugly into the adjustment screw.
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Adjustment Process:
- Increasing Check Height: Turn the plastic screw clockwise. This will generally allow for greater backflow prevention or a higher pressure threshold before the valve opens.
- Decreasing Check Height: Turn the plastic screw counter-clockwise. This will typically reduce the pressure required to open the valve, making it easier for flow to proceed in the intended direction.
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Important Considerations:
- Material: Exercise caution while adjusting to avoid damaging the plastic adjustment screw. Do not overtighten.
- Application: The specific adjustment procedure and range can vary based on the check valve's design and application. Always consult the manufacturer's documentation when available.
- Fine-tuning: Make small adjustments and test the valve's performance to achieve the desired outcome. It may take a few iterations to find the optimal setting.
In summary, adjusting a check valve usually involves using a flat-blade screwdriver to turn an adjustment screw, with clockwise rotations increasing the check height and counter-clockwise rotations decreasing it.
