In pulp & paper (paper mill) systems, valves are exposed to abrasive pulp, fibrous slurry, bleaching chemicals, high temperature steam, and corrosive liquors. So the valve selection is focused on anti-clogging design, wear resistance, corrosion resistance, and easy maintenance. Below is a complete industrial breakdown.

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🏭 Types of Valves Used in Pump & Paper Mill Industry

1. Knife Gate Valve (Most Important for Pulp Slurry)

Application:

• Pulp stock lines

• Waste paper recycling slurry

• Thick sludge & fibrous media

Technical Details:

• Body: Stainless steel / Cast iron / SS316

• Pressure: PN10–PN16 (standard)

• Temp: Up to 180°C

• Design: Full bore, non-clogging

• Operation: Manual / Pneumatic / Electric

Key Features:

• Cuts through thick pulp fibers

• Self-cleaning blade action

• Ideal for abrasive slurry

💰 Price range (India): ₹5,000 – ₹45,000 (size dependent)

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2. Butterfly Valve (Water & Chemical Lines)

Application:

• Process water

• Chemical dosing lines

• Low-pressure slurry lines

Technical Details:

• Body: CI / DI / SS

• Disc: SS304 / SS316 / CF8M

• Seat: EPDM / NBR / PTFE

• Pressure: PN6–PN16

• Operation: Lever / Gear / Actuator

Key Features:

• Lightweight and compact

• Quick shut-off (quarter turn)

• Cost-effective for large pipelines

💰 Price range: ₹1,500 – ₹25,000

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3. Ball Valve (Chemical & Utility Control)

Application:

• Chemical handling (NaOH, bleaching agents)

• Steam & condensate lines

• Utility systems

Technical Details:

• Body: SS304 / SS316 / WCB

• Pressure: PN16–PN40

• Temp: Up to 220°C

• Type: Full bore / Reduced bore

Key Features:

• Tight shut-off

• Low torque operation

• High chemical resistance

💰 Price range: ₹2,000 – ₹30,000

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4. Globe Valve (Flow Regulation)

Application:

• Steam systems

• Chemical dosing control

• Pressure regulation

Technical Details:

• Body: Cast steel / SS

• Pressure: PN16–PN100

• Temp: Up to 400°C

• Design: Rising stem

Key Features:

• Excellent throttling control

• Accurate flow regulation

• Higher pressure drop

💰 Price range: ₹3,000 – ₹40,000

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5. Check Valve (Non-Return Valve)

Application:

• Pump discharge lines

• Water & slurry systems

• Prevent backflow in process lines

Technical Details:

• Types: Swing / Lift / Dual plate

• Body: CI / SS

• Pressure: PN6–PN40

Key Features:

• Prevents reverse flow

• Protects pumps

• Low maintenance

💰 Price range: ₹1,200 – ₹20,000

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6. Plug Valve (Abrasive & Muddy Media)

Application:

• Lime slurry

• Mud, thick chemical fluids

• High-viscosity pulp lines

Technical Details:

• Body: CI / CS / SS

• Pressure: PN10–PN25

• Type: Lubricated / Sleeved

Key Features:

• Excellent for abrasive flow

• Tight sealing

• Simple operation

💰 Price range: ₹4,000 – ₹35,000

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7. Diaphragm Valve (Corrosive Chemical Service)

Application:

• Acid/alkali dosing

• Bleaching chemical systems

• Wastewater treatment

Technical Details:

• Lining: Rubber / PTFE

• Pressure: PN6–PN10

• Temp: Up to 120°C

Key Features:

• Zero leakage design

• Excellent corrosion resistance

• Ideal for hazardous chemicals

💰 Price range: ₹3,500 – ₹25,000

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📊 Summary (Paper Mill Valve Selection Guide)

Valve Type	Main Use	Strength
Knife Gate Valve	Pulp & slurry	Anti-clog, heavy duty
Butterfly Valve	Water systems	Low cost, large size
Ball Valve	Chemicals	Tight shut-off
Globe Valve	Flow control	Accurate regulation
Check Valve	Pump protection	Backflow prevention
Plug Valve	Abrasive slurry	Durable sealing
Diaphragm Valve	Chemicals	Corrosion resistance

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