Possible Cause of Problems

• Expired glue, improper joint, insufficient or contaminated.
• Improper threads, way of wrapping the PTFE incorrect.
• Connector cracked at the joint due to excessive tightening of the thread.
• Connector cracked due to insufficient valve support.
  
  

Corrective Action

• Reinstall and check glue quality.
• Check if the thread dimension is appropriate; replace or reinstall.
• Reinstall the threaded connection according to the proper procedures.
• Replace the cracked connector ; without pressing too much.
• Add supports to each side of the valve.
  
  

Possible Cause of Problems

• Connector misaligned.
  
• Body side O-ring displaced or deteriorated; impurity inside the O-ring groove.
• Shrinkage in the piping system stretches connectors; improper end connector spacing.
• Loose union nut.
• Side O-ring displaced or pinched.
  
  

Corrective Action

• Align piping system, end connector should be parallel.
• Check for proper valve support.
• Open the valve and check the O-ring for physical or chemical damage.
• Check the compatibility of the O-ring, if necessary you should replace a new one.
• Clean and replace the O-ring.
• Check the deflection by the temperature: Check the working temperature of the system, external thermal resistance (including direct sunlight) and thermal energy produced by the system.
• Install expansion loop and correct spacing.
• Retighten the nut.
• Remove the end cap; change seal or replace O-ring.
  
  

Possible Cause of Problems

• Stem O-ring damaged.
  
  

Corrective Action

• Open the valve and check if the stem's O-ring has physical or chemical damage.
• Check the compatibility of the O-ring, if necessary you should replace a new one.
• Check the deflection temperature: Check the working temperature of the system, external thermal resistance (including direct sunlight) and thermal energy produced by the system.

Possible Cause of Problems

• External impact.

Corrective Action

• Protects against impact.
  
  

Possible Cause of Problems

• Opening / closing range extended.
• Excessive exposure to direct sunlight, which causes softening of the handle material.
  
  

Corrective Action

• Do not excessively rotate the handle outside of the open/close range, replace the new handle.
• Protect or cover the valve from direct exposure to the sun.
  
  

Possible Cause of Problems

• External impact.
• Range of opening / closing extended.
  
  

Corrective Action

• Protects against impact.
• Do not excessively rotate the handle outside of the open/close range.
  
  

Possible Cause of Problems

• External impact.
• The nut is excessively tightened or pulled.
• Inadequate valve supports.
• Excessive internal pressure / water hammer.
  
  

Corrective Action

• Protects against impact.
• Adjust the gap between the end connectors to an appropriate length to install the valve.
• On each side of the valve provide supports in the system.
• Check system pressures and water hammer, air evacuation in piping system.
  
  

Possible Cause of Problems

• Misalignment of the piping system, external impact.
• Over tightened threaded connection causing end connector fracture.
• Insufficient valve support causing end connector fracture.
  
  

Corrective Action

• Check the alignment of the piping system, the end connector must be parallel.
• Protects against impact.
• According to the installation guide to install new end connector.
• On each side of the valve provide supports in the system.
  
  

Possible Cause of Problems

• External impact.
• Excessive internal pressure.
• System misalignment.
• Inadequate valve support.
• Chemical attack.
  
  

Corrective Action

• Protects against impact.
• Check the pressures of the piping system and water hammer, if it contains trapped air.
• The end connector must be parallel.
• On each side of the valve provide support in the system.
• Check the chemical compatibility of the system fluids.
  
  

Corrective Action

• Disassemble the valve, and check if the passage is blocked by impurities. Clean and reinstall the valve.
  
  

Corrective Action

• Disassemble the valve, and check if the passage is blocked by impurities. Replace and reinstall the valve.
  
  

Corrective Action

• Disassemble the nut and reinstall the internal connector with appropriate force.
• IMPORTANT: Over tightening will cause the valve to stick.
  
  

Corrective Action

• Remove the valve seats.
• Check if the seat is deformed, damaged, or scratched. Replace and reinstall.
  
  

Corrective Action

• Check if the flow velocity of the piping system is too fast.
• Disassemble the valve and check the O-ring for physical or chemical damage.
• Check the compatibility of the O-ring, if necessary you should replace a new one.
• Clean and replace the O-ring.
  
  

Corrective Action

• Remove and disassemble the valve ball.
• Check for physical damage on the ball such as scratches.
• Replace and reinstall the valve.
  
  

Corrective Action

• Check the ball, O-ring or seat if there is a deposit of glue, replace the component and reinstall.
  
  

Corrective Action

• Clean it and reinstall.
  
  

Corrective Action

• Check system operating temperatures, external heat sources (including direct sunlight) and heat generated by the system.