The Threaded ball valve is a kind of ball valve. The connection between the valve and the pipeline is threaded.(BSPT, BSP,NPT etc).
It is mainly used for low pressure, small diameter pipelines with nominal pressure PN16-140 and nominal size DN8-DN100.
The ball valve could be in vertical or horizontal pipe runs. They are bi-directional therefore flow direction is not critical; In principle, the ball valve installation has no direction. Still, in the actual building, to prevent excessive leakage between the valve body and the valve cover, the ball valve body is usually connected to the tank’s direction or the material. The best practice is to set up the valve handle to point in the direction of flow whenever possible.
#1- These ball valves are thread connections, so please make sure it is the right thread you pick. Would you please check our other blog on how to distinguish BSPT, BSP & NPT?
#2- Inspect the ball valve ports, seating surfaces, and threads to ensure they are clean and free of foreign debris.
#3- Operate the ball valve from fully open to fully closed position. Make sure it is fully closed before installation.
#4- Ensure the threaded pipe connections to be threaded into the valve are accurately threaded, clean, and free of foreign debris. Use thread sealing compound or PTFE thread sealing tape to ensure a leak-free pipe joint seal.
#5- We always use two wrenches when assembling a two-piece ball valve with pipe connections. Position one wrench on the valve end closest to the pipe joint being tightened and the other wrench onto the pipe to prevent transmitting torque through the valve body joint, between the valve body and tailpiece. Tighten until you can feel the joint starting to seat and the fitting is almost pointing in the desired direction.
Storage and Maintenance
#1- Please ensure that the ball valves are in a fully open state for long-term stock in the warehouse. When stored in a half-open state for a long time, the compression and damage to the seal are the most serious.
Generally, the valves in our shipping state are fully opened.
#2-Suppose there is leakage during use. If the position of the handle is leaking, you can take the following simplest way to repair it.
- Do not repair valves under pressure.
- Remove the handle and tighten the gland nut with a wrench.
If there is leakage between the valve body and the valve bonnet, it is recommended not to repair the 1-piece thread ball valve & 2-piece thread ball valve directly on the pipe.
However, if it is a 3-piece thread ball valve, you can replace it with a new gasket (PTFE) under the guidance of professional personnel. (Do not repair valves under pressure).