4.3 Troubleshooting

4.3 TROUBLESHOOTING

MALFUNCTION

POSSIBLE CAUSE

Valve does not rotate or operate 1. Packing is dropped too tightly. 2. The stem is damaged or there is dirt. 3. The times or on-off operation are too many or debris exists on the surface of the ball.

Ball/Seat Leaking

1. Valve not fully closed. 2. Seat or ball damaged. 3. Debris trapped in valve. Stem Packing Leaking 1. Packing gland nut loose. 2. Packing damaged or missing. 3. Seal misaligned. Body Gasket Leaking 1. Body joint. 2. Body gasket damaged.

REDIAL ACTION

1. Loosen packing and adjust again. 2. Pull apart the valve and clean the dirt.

1. Close the valve tightly. 2. Replace seat or ball. 3. Clean the debris. 1. Tighten gland nut. 2. Replace packing (shut down first). 3. Replace and align it correctly. 1. Tighten body nut. 2. Replace the gasket.

Note Nylon and Devlon are hard and more scratch resistant compared to Teflon®, and PEEK is harder still. However, Teflon® is more resilient and has better ‘memory’ in terms of resistance to permanent indentations. All soft seated valves are only suited to clean service applications.