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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.

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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

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

Table of Contents

Main Components of a Ball Valve

Valve Body (Materials & Design)

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

Stem (Brass, Stainless Steel, Carbon Steel)

Seats & Seals (PTFE, EPDM, Graphite)

O-Rings (NBR, FKM, Silicone)

Handle & Actuation Mechanisms

Complete Ball Valve Component-Material Chart

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

Contact Us for Pricing & OEM Support

Call

E-mail

Website

FAQs – Ball Valve Components

Can I replace just the seats or stem?

What causes valve seats to wear out?

Is Delrin better than PTFE?

What’s the difference between NBR and Viton?

Are actuators interchangeable?

Ready to Connect Faster, Safer, Smarter?

Explore Configurations, Compare Materials, and Get Prices Fast

We serve purchase heads, OEMs, and end-users with tailored Ball Valve Components & Materials – Understand Every Part That Makes It Work recommendations and commercial pricing.

+91-8591096714

In the year 1988

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