Home > Product > Ball Valve > Ball Valve Components & Materials
At Perfect Engineers, we believe informed buyers make better choices. Whether you’re specifying a valve for water, oil, steam, or chemical flow, it’s critical to understand the internal parts of a ball valve and how the materials used in each component affect performance, lifespan, and safety.
This page gives you a complete breakdown of every ball valve part, its function, and the most suitable material options available for your application.
A typical industrial ball valve is made up of 7 to 10 key parts—each playing a critical role in performance. The major components include:
Function:
The outer casing that holds all internal components and connects to the pipeline.
Materials:
Function:
The rotating sphere with a bore (hole) through it that opens or blocks the flow.
Materials:
PTFE-Coated or Ceramic – For aggressive chemicals or slurry
Function:
Connects the handle or actuator to the ball, transferring torque to rotate it.
Materials:
All Perfect QRC valves use blowout-proof stem design for safety under pressure.
Function:
These soft rings press against the ball to provide a tight, leak-proof seal.
Materials:
Function:
Prevent leakage around the stem, ball, and connections.
Materials:
Function:
Used to manually or automatically operate the valve (open or close the ball).
Types:
Component | Function | Common Materials |
Body | Structural housing | SS304, SS316, WCB, Brass, PVC |
Ball | Controls flow | SS316, Chrome Brass, Ceramic |
Seat | Leak seal | PTFE, RPTFE, Graphite, Delrin |
Stem | Transfers torque | SS304/316, Brass, CS |
Handle/Actuator | Operation control | Steel, Aluminum, Pneumatic/Electric |
End Connectors | Pipe interface | Flange, Thread, Weld, Clamp |
O-Rings | Prevent leakage | Viton, EPDM, NBR, PTFE |
Stem Packing | Seal stem area | PTFE, Graphite |
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Yes—3-piece ball valves allow seat, seal, and stem replacements without removing from line.
Abrasive fluids, over-torquing, or excessive temperature.
Abrasive fluids, over-torquing, or excessive temperature.
NBR is for fuel and oil; Viton handles chemicals and acids better.
Yes—if the valve is ISO 5211 compliant, actuators can be swapped.
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