How do I adjust the size of a low-pressure valve?

Adjusting the size of a low-pressure valve is typically done by turning the adjustment bolt on the valve. Turning it clockwise generally increases the outlet pressure or flow rate, while turning it counterclockwise decreases them. The following are the general steps and precautions for making adjustments:

**Preparatory work before adjustment:** Before starting the adjustment, ensure safety at all times.

- Close the upstream valve: First, close the gate valve in front of the low-pressure valve to cut off the fluid supply.

- Open the downstream valve: Open the gate valve after the low-pressure valve to create a low-pressure environment downstream, which facilitates the adjustment process.

**Tools required for adjusting the low-pressure valve:** Depending on the type of valve, you may need tools such as a wrench, screwdriver, or pressure gauge.

**Adjustment steps:**

1. Open the adjustment cover: Locate the adjustment cover or protective cover on the top of the valve and open it to expose the adjustment bolt.

2. Adjust the adjustment bolt:

   - To increase pressure/flow rate: Turn the adjustment bolt clockwise slowly.

   - To decrease pressure/flow rate: Turn the adjustment bolt counterclockwise slowly.

3. Make small adjustments: Each turn should be slight, preferably about 1/4 of a full turn. Observe the pressure gauge or the system’s response during the adjustment process.

4. Lock the adjustment: Once the desired pressure or flow rate is achieved, tighten the lock nut to secure the adjustment bolt and prevent it from loosening.

5. Check the system: Slowly open the upstream valve to allow fluid to flow back into the system. Check whether the downstream pressure remains stable and inspect all connections for any leaks.

Tags: low-pressure valve