Weir type diaphragm valve

Maintenance and solutions to common problems with diaphragm valves

Diaphragm valves have a structure that is quite different from general valves. They belong to a new type of valve, which is a special form of shut-off valve. The closing element is a diaphragm made of flexible material. It separates the cavity inside the valve body from the cavity inside the valve cover and the driving components. Diaphragm valves are now widely used in various fields. Common types of diaphragm valves include rubber-lined diaphragm valves, PTFE-lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves.

Maintenance of Diaphragm Valves

  1. Before installation, carefully check whether the operating conditions of the pipeline are within the specified range for the valve, and clean the inner cavity to prevent dirt from obstructing or damaging the sealing components.
  2. Do not apply grease or similar substances to the rubber lining and the surface of the rubber diaphragm to prevent rubber expansion and affect the service life of the diaphragm valve.
  3. The handwheel or transmission mechanism should not be used for lifting, and collisions should be strictly prohibited.
  4. When manually operating the diaphragm valve, do not use auxiliary levers to prevent excessive torque from damaging the drive components or sealing parts.
  5. The diaphragm valve should be stored in a dry and ventilated room, not stacked. The two ends of the stored diaphragm valve must be sealed, and the closing element should be in a slightly open state.

Common Faults and Solutions of Diaphragm Valves

  1. Diaphragm Damage:
    • Cause: Aging of rubber or fluoroplastic diaphragm.
    • Prevention and Solution: Replace regularly.
  1. Ineffective Operation:
    • Causes:
      • Diaphragm detachment from the valve disc.
      • Wear or breakage of the connecting pin between the valve stem and valve disc.
      • Wear and seizure at the connection of the movable valve stem nut with the valve cover and valve stem.
    • Prevention and Solution: Avoid excessive opening. Repair or replace the diaphragm promptly if detachment occurs.

Leave a Comment

Your email address will not be published. Required fields are marked *