Heavy Duty Urethane Lined Knife Gate Valves

2in~48in; PN0~PN20 (Class125~150)

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Product Advantages

icon 5x Wear Life: 100% PU Lined with Zero Metal Contact

icon One-Piece Solid Cast Body: Unlike split-body designs that can deform and leak under pipeline stress, our robust one-piece solid body eliminates structural weakness and external leakage.

Standards and Certifications

Design and Manufacture: MSS SP-81, ASME B16.34, JB/T 8691

Pressure & Temperature Rating: ASME B16.34

Side Flange Standards: ASME B16.5 (Class 150), EN 1092-1 (PN10/PN16), JIS B2220 (10K), AS 2129, GOST 33259

Top Flange (Actuator Mounting): ISO 5211; GB 90°

Face-to-Face Dimension: MSS SP-81, EN 558-1, GB/T 12221

Testing Standards: API 598, MSS SP-81, ISO 5208, EN 12266-1

Certifications: ISO 9001; CE; BV; API 609; API 598; EAC; SIL3；

Technical description

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Q&A

Specification of the Valve

Valve Type	Heavy Duty Polyurethane (PU) Lined Solid Body Knife Gate Valve
Connection	Flanged, Wafer, Lugged
Actuation	Handwheel / Bevel Gear / Pneumatic Cylinder / Electric / Hydraulic
Size Range	DN50 ~ DN1200 (Larger sizes upon request)
Pressure Rating	PN6 / PN10 / PN16 / Class 150 / JIS 10K / Table D&E
Ideal Medium	Highly abrasive slurries, mining tailings, bottom ash, grit water, reject stock.
Operating Temp.	-20℃ ~ +80℃ (-4℉ ~ 176℉) *Strictly limited by Polyurethane properties

Material Configuration

Valve Body	Ductile Iron (GGG40/50), Carbon Steel (WCB), Stainless Steel *One-piece solid cast; body never touches medium due to full lining.
Lining & Seat	100% Premium Polyurethane (PU/Urethane). Integrated U-shape design for Bi-directional zero leakage.
Gate / Blade	SS304, SS316, SS316L, Duplex 2205, 17-4PH (Precision beveled edge)
Stem	Stainless Steel: SS410, SS304, SS316
Packing	PTFE impregnated synthetic fiber with elastomer core (prevents top leakage).

Engineered for Severe Abrasive Slurries

Designed specifically to conquer the industries' most destructive media. Our solid body fully PU-lined knife gate valve guarantees bidirectional zero leakage and massively outlasts standard metal or rubber-seated valves.

Mining & Mineral Processing

The Biggest Market: Unmatched performance in handling highly abrasive mineral sands, tailings, and concentrates. The premium PU lining absorbs continuous impact, lasting up to 5x longer than natural rubber.

Coal-Fired Power Generation

Ash Handling Solutions: Wet and dry ash (bottom ash/fly ash) are notorious for destroying standard valves in days. Our solid-body cavity-free design prevents grit accumulation, ensuring smooth operation in ash slurry lines.

Pulp & Paper

Reject Stock Specialist: Recycled pulp often contains staples, grit, and rocks. The robust beveled SS blade easily shears through debris, while the tough urethane lining resists physical tearing and gouging.

Chemical Processing

For Physical Wear: Perfect for conveying heavy, crystallized chemical slurries where physical abrasion is the primary issue rather than strong chemical corrosion.

Wastewater Treatment

Grit & Sand Water: In municipal or industrial pump stations handling high-sand-content water (like coal washing water), the PU lining forms a tight seal around trapped particles for zero leakage.

Application Limitations (Important)

To ensure maximum safety and lifespan, please note:

Temp Limit: Max 80°C (176°F). Higher temps will melt PU.
Media Limit: Avoid strong acids/alkalis & aromatic solvents (causes PU swelling).
Pressure: Ideal for Low/Medium pressure (up to 150LB/PN16). Not for high-pressure pipelines.

QUALITY & COMPLIANCE CERTIFIED

Heavy Duty Urethane (PU) Lined Slurry Knife Gate Valve

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Sample MTC (EN 10204 3.1) - Material Traceability

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Urethane-Lined-Knife-Gate-Valves: Technical FAQs

What are the main advantages of urethane-lined-knife-gate-valves compared to standard rubber valves?

Our fully PU-lined valves provide unmatched durability in severe conditions:

5X Wear Life: Premium polyurethane (PU) lining outlasts standard natural rubber or EPDM by up to 5 times in abrasive environments.
Zero Metal Contact: The 100% full lining ensures the metal valve body is never subjected to abrasive washout or corrosion from the media.
Bi-Directional Zero Leakage: The integrated PU seat forms a tight seal around trapped solids, ensuring 100% tight shut-off in both flow directions.

Why should I choose JRVAL as my manufacturer for urethane-lined-knife-gate-valves?

JRVAL is not a trading company; we are an ISO9001 & CE Certified source factory:

20 Years of Expertise: The reliability and structural rationality of our products have been strictly verified by the global market and real-world facts for two decades.
Complete Supply Chain: We seamlessly integrate casting, precision machining, and final assembly in-house to guarantee strict quality control.
Factory-Direct Pricing: By controlling the entire manufacturing process, we deliver premium severe-service valves at highly competitive OEM prices.

What specific industries and abrasive media are these valves designed for?

Our solid-body urethane-lined-knife-gate-valves are built specifically for destructive fluids:

Mining & Mineral Processing: Excels in handling highly abrasive mineral sands, tailings, and dense slurries without clogging.
Coal-Fired Power Plants: The perfect solution for wet and dry ash (bottom ash/fly ash) handling systems.
Pulp & Paper / Wastewater: Easily shears through reject stock, fibrous pulp, and heavy grit/sand water.

How does the solid one-piece body design improve the valve's performance?

Unlike traditional split-body designs that are prone to leaking, our structure offers maximum safety:

No External Leakage: The one-piece solid cast body eliminates the structural weakness of two-piece valves, preventing deformation under pipeline stress.
Cavity-Free Bottom: Engineered with a flush bottom to prevent abrasive solids from accumulating, ensuring the gate never jams during operation.
Precision Beveled Gate: Made of high-grade stainless steel, the blade cuts through thick particulates effortlessly to achieve a tight seal against the PU lining.