On the US market now exists a huge amount of poor-quality ball valves. Here are the main risks facing the use of low-quality tap:
The new valve is not prolonged mechanical seal, hidden under the arm. The investigation – a constant leak from the handle. To remedy should be to dismantle the handle and tighten the nut draw in mechanical seal, then install the handle in place.
Deficient mechanical seal valve stem. valve, who has a problem, requires replacement. US Market statistics of mixing valves.
Short thread connecting the two halves of a ball at first glance faucet is serviceable.
However, even with a small force, sent after a fixed valve perpendicular to its axis, there is a fault tap into two halves. This is the most insidious of all possible defects. In practice, this effort is most often
because man stumbles on the pipeline, which is off or tripped about something, with a flourish, based on the valve arm. US Market statistics of mixing heating valves.
small thickness of the metal valve at the site where it is threaded inside. When such valve on the pipeline or fitting is
longitudinal fracture of the screw tap. There are times when mounted valve crack after some time, and place a small crack starts leaking.
Sometimes the thickness of the metal in the threaded portion of one half of the valve is sufficient, and threaded part of the other half
thin. Therefore, when buying should pay attention to it overly long thread on the threaded part of the valve in the half, which is located resharpening This problem occurs not very often.
However, if you purchased the valve with such a defect, then he broke half of the place resharpening even with a small effort, aimed perpendicular to the axis of the valve. In practice, such efforts are most often occurs because man stumbles on the pipeline, which is off or tripped about something with a flourish, based on the valve arm.
Internally threaded part of the valve axle threaded does not coincide with the axis of the ball valve.
This valve is functioning properly, but tied up with pipes and fittings, looks very clumsy because of the fact that the axis of the location of fittings to tap does not coincide with the axis of the location of the fittings after the valve. US Market statistics of plumbing valves.
An excessively high content of zinc in the material of construction valve. When the metal valve becomes brittle, like a thin cast iron. Breaking the valve in this case it possible to absolutely anywhere.
Even if you do not finish reading the above list of defects, you probably already understood that the choice of ball valve, as the most important part of the valves, should be taken
seriously. Certainly not worth going through all the taps, lying on the tray from the seller. Just need to buy valves are not cheaper than the average price or better still, buy them at the firm engaged in not only sales but also sold to plumbing installation.