Non-Rising Stem (NRS) Ceramic Knife Gate Valve

Our Non-Rising Stem (NRS) Ceramic Knife Gate Valve is specifically engineered for the most demanding “Solid-Liquid” two-phase flow conditions. Whether you are managing high-hardness particles like bottom ash and slag or corrosive chemical slurries, this valve provides a service life up to 10 times longer than standard metal valves.

By integrating structural ceramics (HRA 88+) into the flow path and sealing zones, we offer a solution that is nearly as hard as diamond, ensuring unrivaled resistance to wear, erosion, and oxidation.

Core Advantages & Features

1. Superior Material Science (HRA 88+)

The sealing faces and wear-prone flow components are crafted from high-toughening structural ceramics. With a hardness exceeding HRA 88, these components resist the high-velocity impact of abrasive particles, maintaining tight shut-off where traditional metals fail.

2. Advanced Seat Protection Technology

Our patented “Protection Lip” design features a specialized ceramic ring structure. This lip prevents hard solids from shearing or cracking the ceramic seat during the final stages of valve closure, significantly extending the maintenance cycle.

3. Non-Rising Stem (NRS) Circular Sealing

Breaking away from traditional rectangular seals, our NRS design utilizes a Circular Perimeter Seal combined with a Floating Seal Structure. This significantly improves sealing performance and ensures the upper seal’s lifespan matches the life of the pipeline.

4. Anti-Clogging & Self-Cleaning Blade

Full Bore Flow: The unobstructed flow path prevents material buildup and reduces startup torque.
Sharp Knife Edge: The polished stainless steel gate features a sharp beveled edge capable of cutting through thick slurries and solid scales.
Polished Surface: Reduces penetration resistance, protecting the packing and the seat from friction damage.

5. Ultra-Short Face-to-Face Design

The compact, lightweight construction saves material and space, reducing the overall stress on your piping system and allowing for installation at any angle.

Technical Specifications

Feature	Details
Body Materials	WCB (Cast Steel), CF8 (SS304), CF8M (SS316)
Gate Material	Stainless Steel with Ceramic Coating options
Sealing Material	High-Toughening Structural Ceramics (TC)
Nominal Diameter	DN50 – DN1200 (NPS 2″ – 48″)
Pressure Rating	0.6MPa, 1.0MPa, 1.6MPa, 2.5MPa (Class 150)
Temperature Range	-38°C to +650°C (Material dependent)
Drive Options	Manual, Electric, Pneumatic, Electro-Hydraulic
End Connections	ANSI B16.5, GB/T9113, JB/T79, DIN, JIS

Performance Data

Nominal Pressure (MPa)	Shell Test (MPa)	Seal Test (MPa)	Suitable Media
1.0	1.5	1.1	Ash/Slag Water, Pulp, Sewage, Coal Slurry, Cement
1.6	2.4	1.8	High-velocity abrasive fluids, Corrosive slurries

Dimensional Data (PN1.0 / 10 Bar)

(Select Sizes Shown. Full Data Sheet Available Upon Request)

DN (mm)	L (mm)	D (mm)	D1 (mm)	D2 (mm)	N-M (Bolts)
50	43	160	125	100	4-M16
100	52	215	180	155	8-M16
200	60	335	295	265	8-M20
300	78	440	400	368	12-M20
600	154	780	725	685	20-M27
1200	254	1450	1380	1325	32-M36

Applications

Specifically designed for harsh environments in:

Power Plants: Bottom ash handling, fly ash transport, and FGD systems.
Mining & Steel: Tailing discharge, mineral processing, and slag flushing.
Chemical & Cement: Corrosive slurries and dry bulk pneumatic conveying.
Paper & Pulp: Heavy-stock processing with abrasive contaminants.

Order & Customization

Our NRS Ceramic Knife Gate Valves are available with optional sealed bonnets for dust-heavy or dry environments, ensuring the stem threads remain lubricated and free of debris.