Is there adjustment limits on the regulation valves of LCN manual closers?

The regulation valves are designed to adjust the flow the hydraulic fluid in the closer which regulates the door closing speed through various phases of the closing cycle. The regulation valves have limited adjustment and if opened up too far can cause damage to the seals and create hydraulic fluid leaks. The regulation valve assemblies are staked to provide some warning when the screws are at max adjustment but they cannot prevent the valve from being over adjusted.

The most common reason why users over adjust the regulation valve is to create more force to ensure the door latches during closing. Opening up or adjusting the latch speed will increase the latch speed but does not increase the closing force provided for latching the door, if more force is needed to latch the door the spring power should be increased.

The following information is a guide to ensure the regulation valves are not overly adjusted:

• Shut off position: Shut off the valve by rotating it clockwise until it stops rotating
• 1 turn out from shut off position: Very slow regulation / speed
• 1 ½ turns out from shut off position: Slow regulation / speed
• 2 turns out from shut off position: Normal regulation / speed
• 2 ½ turns out from shut off position: Fast regulation / speed
• 3 turns out from shut off position: Very Fast regulation / speed
• 3 ½ turns out from shut off position: No Regulation, door will slam
• >3 ½ turns out from shut off position: Risk of damaging seals – No impact to regulation or speed

We do not recommend opening / adjusting the regulation valves more than 3 full turns from the shut off position.

Related solution: How do you adjust a door closer?