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In order to create a properly sealed environment,
care must be taken to properly thread and seal your float
switch. Here are a few words of advice to assist you. Always
be sure to consider the thread engagement or mounting type
when selecting your actuation levels.
- Gasket and seal materials should be
selected with both fluid and environmental considerations
in mind. Be sure to use the proper torque for the selected
fittings. Excessive torque is the most common cause of seal
failure.
- NPT threads are tapered threads
designed to compress for a waterproof, pressure tight seal.
To insure proper thread fit and seal a TeflonT tape or compatible
thread sealant should be applied to the threads before installation.
The proper torque should be applied using the following
guidelines;
- Plastics NPT - Install
the threads till hand tight, than using the proper wrench,
tighten the hex an additional 3/4 to 1 turns. Be careful
not to over torque. If leaking appears, increase by
1/4 turn at a time until proper seal is created.
- Metal NPT - After applying
a thread tape or sealant, start the threads by hand,
then tighten until approximately 3 to 4 threads are
engaged. If leaking appears, increase by 1/4 turn at
a time until proper seal is created.
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