The correct method for installing a gate valve

The correct installation of a gate valve requires following a series of steps and precautions to ensure good sealing performance, flexible operation, and long-term stability. The key points include pre-installation checks, confirmation of the correct orientation, provision of sufficient operating space, uniform tightening of bolts, and post-installation testing.

**Pre-installation Preparation:**

- Check the condition of the valve to ensure that its model and specifications match the application requirements.

- Inspect whether the inside of the valve body and the sealing surfaces are clean, free from dirt, sand, or rust.

- Verify the direction of fluid flow. Since a gate valve is a one-way valve, the arrow on the valve body must align with the flow direction; otherwise, the valve will not operate properly.

**Provision of Operating Space:**

- Ensure that the installation location is convenient for operation and maintenance. For manual valves, the handwheel should be easily accessible; for electric/pneumatic valves, sufficient space must be reserved for the drive mechanism.

**Gate Valve Installation Steps:**

1. **Position and Secure the Valve:** Align the valve with the pipe flanges and ensure that the connection surfaces are parallel to avoid deformation of the valve body during installation.

2. **Tighten the Bolts Symmetrically:** Tighten the bolts in stages to prevent uneven distribution of forces.

3. **Sealing and Gasket Handling:**

   - Check the tightness of the gasket to ensure good sealing while maintaining the flexibility of the gate.

   - If a soft seal (such as rubber or Teflon) is used, remove any debris from the inner cavity before installation.

4. **Connect the Drive Mechanism:** For pneumatic/electric valves, connect the wires according to the wiring diagram to ensure a stable supply of air or power.

5. **Initial Test Run:** Before powering on for the first time, manually open the valve to half-open position and perform an empty-load test run.

**Post-installation Testing and Maintenance:**

- Conduct a test run to check whether the valve operates smoothly, whether there are any leaks, and to test its sealing performance.

- Perform regular maintenance: Check the tightness of the gasket periodically and replenish the sealing grease as needed. Also, avoid impacts or compressions on the valve.

- **Environmental Requirements:** The valve should be installed in a dry and well-ventilated area, away from humid or corrosive environments. If it will be used in high-temperature conditions, it may require “thermal expansion” treatment.