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Lock Nut


Some cylinder valve designs (e.g., diaphragm, packed etc.) have a threaded upper spindle engaging with the gland nut internal threads. These designs may witness loosening of the gland nut due to the applied torque on the operating mechanism.


The gland nut is secured by a lock nut having threads in opposite direction to the gland nut threads to avoid the risk of loosening in service.


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