Ball valve types: hints for the right choice

Ball valves have been so popular in the industry for many years because of their excellent tightness. These shut-off valves are distinguished according to various criteria:

Flow capacity

  • Full-bore ball valves
  • Reduced-bore ball valves

Connection to the pipeline

  • Flanged ball valves

This type of ball valves is connected to the pipeline by screwing and pressing the valve flange to the pipe flange. Additionally, there is a sealing between the flanges which prevents medium leakage.

  • Ball valves with butt-weld ends

On the ends of the ball valve, one or more special bevel edges (chamfers) are made, where a matching piece of the pipe is connected by welding.

  • Socket ball valves (threaded connection)

Ball valves with this connection type respectively have a thread which is screwed into the pipe.

  • Combined

Various combinations of the above-mentioned connection types are possible.

Material of the valve body

  • Ball valves of stainless steel
  • Steel ball valves
  • Cast-iron ball valves
  • Ball valves of brass
  • Ball valves of synthetic materials
  • Pinned ball

Closure member configuration

The actuating force for such ball valves is considerably lower.

  • Floating ball

It is applied for the nominal diameters of max. 250 mm, because the larger the diameter is, the stronger is the pressure put on the sealings by the ball. This obstructs the functioning of the ball valve.

Sealing type

  • Metal sealing
  • Soft sealing

The choice of ball valves requires profound technical knowledge from a design engineer/a user. Especially important is the knowledge of:

  • The actual working parameters
  • The material and the nominal pressure of the pipeline
  • Actuator type
  • Valve weight
  • Valve price

Ball valves are perfectly suitable for the application as shut-off valves because of their excellent sealing performance. The important and decisive factor in this case is the set of working parameters. You are welcome to ask us for further assistance – we are willing to share our competence!