Most of ball valves own the sealant injection system. In this article, we will explain why ball valve is installed with sealant injection fittings.

Generally speaking, each ball valve has two sealant injection fittings. One is located at the stem area and the other seat area, like the picture shown below.

The sealant injection system of ball valve plays a part as the emergency sealing or backup sealing when soft sealing rings damage (seat inserts and o-rings) by accident. That means sealant injection system only function for emergency or temporary use, not for permanent sealing purpose.

We use grease gun to inject sealant from two fittings near stem and seat. Apparently, stem injection is to prevent stem leakage and the seat injection is for temporary sealing between ball and seat.

But we should always bear in mind that sealant should not be injected randomly, but it should be used as a last resort. The reason is sticky sealant injected will attract more particles to further damage valve sealing.