How to install a threaded ball valve

Update:23-05-2022
Summary:

Ball valves can be installed in vertical or horizontal […]

Ball valves can be installed in vertical or horizontal pipes, they are bi-directional so flow direction does not matter, but it is best practice to set the valve handle to point in the flow direction whenever possible. Stem orientation doesn't matter, but any deviation from vertical is a compromise. Upside-down installation is not recommended as it can cause the stem packing to accumulate dirt. Best practice is to install the valve with the stem facing up as much as possible. Check ball valve ports, seat surfaces, and threads to make sure they are clean and free of foreign matter. Operate the valve from the fully open position to the fully closed position.

 

Make sure the threaded fittings to be screwed into the valve have accurate, clean threads and are free of foreign objects or metal shavings. Apply a high-quality pipe thread sealant or PTFE thread sealant tape according to the manufacturer's application instructions to ensure a leak-free pipe joint seal. Valves and pipes must be aligned to prevent cross-threading, and male fittings need to be aligned with the axis of the threaded hole. Maintaining proper pipe alignment during assembly can eliminate unnecessary stress on the valve body. Support the Pipe Fittings in alignment to prevent any unnecessary stress on the valve body by connecting piping.

 

Pipe supports must be able to maintain pipe alignment and support the weight of fittings, valves, pipes and their contents. When installing two-piece ball valves, always use two wrenches when assembling the fittings for these valves. Place one wrench on the valve end closest to the fitting to be tightened and the other on the pipe to prevent torque from being transmitted between the body and tailpipe through the body fitting. This also prevents deformation of the internal parts of the valve. WARNING: Failure to follow this instruction will place stress on body joints and may result in leaks at body joints. Tighten until you can feel the joint starting to seat and the fitting is almost pointing in the desired direction.

 

Then increase the tightening force a little if each attempt gives less movement, continue to tighten until you have proper alignment and you should have a sound joint . If the movement stops suddenly, you have probably bottomed out against the stop in the valve body. CAUTION: Never back off a connection to achieve proper alignment. Do not overtighten the valve to the pipe as this may distort the valve internals Or cause the valve body to stress fracture. As a general guideline, after hand-tightening the joint, tighten an additional 1-½ to 3 full turns for sizes up to 1", for sizes 1-¼" and for larger 1 to 2-½" full turns, you Should be engaged at 3-1/2 and 6 threads. Thread engagement outside this range may indicate under- or over-tightening of the fitting or out of tolerance threads.