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Ball Valve Components & Materials – Understand Every Part That Makes It Work

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.

Table of Contents

Main Components of a Ball Valve

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:

Valve Body (Materials & Design)

Function:
The outer casing that holds all internal components and connects to the pipeline.

Materials:

  • SS 304 / 316 / 316L – Corrosion resistant, most common
  • Carbon Steel (WCB / A105) – High strength, high pressure
  • Brass / Bronze – Domestic and LPG applications
  • PVC / CPVC / PP / PVDF – Acidic and non-metallic lines
  • Exotic Alloys – Monel, Duplex, Hastelloy for corrosive media

Ball (Materials: SS, Brass, PTFE-Coated)

Function:
The rotating sphere with a bore (hole) through it that opens or blocks the flow.

Materials:

  • SS 316 – Excellent corrosion and strength
  • Chrome-Plated Brass / CS – For air, gas, non-corrosive media

PTFE-Coated or Ceramic – For aggressive chemicals or slurry

Stem (Brass, Stainless Steel, Carbon Steel)

Function:
Connects the handle or actuator to the ball, transferring torque to rotate it.

Materials:

  • SS 304 / 316 – Corrosion resistant, anti-blowout
  • Brass – For small-size brass valves
  • Carbon Steel – Used in CS valves under ANSI specs

All Perfect QRC valves use blowout-proof stem design for safety under pressure.

Seats & Seals (PTFE, EPDM, Graphite)

Function:
These soft rings press against the ball to provide a tight, leak-proof seal.

Materials:

  • PTFE (Teflon) – Standard for most fluids
  • RPTFE – Reinforced for better pressure/temperature
  • Delrin / Nylon – Higher mechanical strength
  • Graphite / Metal – Fire-safe and high-temperature use
  • TFM, PEEK – For food, pharma, or high-purity lines

O-Rings (NBR, FKM, Silicone)

Function:
Prevent leakage around the stem, ball, and connections.

Materials:

  • Viton – Resistant to oils, solvents, acids
  • EPDM – Best for water, mild chemicals
  • NBR / Buna-N – Used in oil & gas lines
  • Graphite / Metal – Fire-safe or high-temp sealing

Handle & Actuation Mechanisms

Function:
Used to manually or automatically operate the valve (open or close the ball).

Types:

  • Manual Lever – Simple 90° rotation
  • Gear Operator – For large or high-torque valves
  • Pneumatic Actuator – Fast, automated air-operated control
  • Electric Actuator – Programmable, motor-driven, SCADA/BMS compatible

Complete Ball Valve Component-Material Chart

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

Buyer Tips – Material Selection Do’s and Don’ts

  • Use RPTFE or Graphite seats for high-temperature lines
  • Always match body and end material to avoid galvanic corrosion
  • Don’t use PTFE seats in abrasive slurry—go with metal or PEEK
  • Choose EPDM or Viton based on fluid compatibility (oil vs water)
  • In food/pharma lines, opt for TFM seats + cavity-free design

Contact Us for Pricing & OEM Support

Call

+91-9004860491

Website

www.perfectqrc.com

FAQs – Ball Valve Components

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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