DN700 Uni-Directional Rising Stem Wafer Manual Handwheel Knife Gate Valve

The DN700 Wafer Knife Gate Valve is engineered for reliable, manual on/off isolation in large-bore pipelines transporting corrosive or abrasive media, such as slurries, pulp, wastewater, and dry bulk materials. The space-saving Wafer design allows it to be installed easily between standard flanges, making it an efficient choice for large diameter, tight-space installations.

Featuring a Rising Stem for clear visual position indication and a robust Manual Handwheel for direct, reliable operation, this valve is a cost-effective and essential component for non-critical flow control applications. Its Uni-Directional sealing ensures zero leakage when pressure is applied from the designated side.

The DN700 Uni-Directional Wafer Knife Gate Valve is designed for reliable shut-off in large-diameter pipelines carrying liquids, slurries, or solids-laden media. With a compact wafer-style body, rising stem design, and manual handwheel operation, this valve is a cost-effective solution for industries that require secure isolation under challenging conditions.

Its uni-directional sealing ensures tight shut-off from one pressure side, making it suitable for wastewater, mining, and power plant applications where flow direction is controlled.

Key Features

DN700 Large Bore Size: Optimized for high-flow capacity and minimal pressure drop in large-diameter piping systems.
Space-Saving Wafer Design: Compact face-to-face dimension allows for easy installation and maintenance between ANSI or DIN flanges.
Uni-Directional Sealing: Provides bubble-tight shut-off against pressure from one side, ideal for demanding isolation duties.
Visual Position Indicator: The Rising Stem mechanism clearly displays the valve’s current position (Open/Closed), enhancing operational safety and awareness.
Non-Clogging Operation: The beveled, precision-ground Knife Gate is designed to cut through static media columns and solids, preventing jamming and ensuring reliable closure.
Manual Handwheel Operation: Ensures simple, reliable, and direct manual control without the need for external power sources (e.g., air or electricity).
Bonnetless Design: Reduces overall height and minimizes potential leak paths to the atmosphere, offering lower maintenance points.

Typical Applications

This heavy-duty knife gate valve is the proven solution for isolation requirements in the following industries and services:

Industry	Application Service
Mining & Metallurgy	Tailings lines, mineral slurry discharge, ore processing.
Wastewater Treatment	Raw sewage, sludge, and media with high solids or fibre content.
Pulp & Paper	Stock lines, fibre processing, and wood chip handling.
Power Generation	Ash slurry lines and flue gas desulfurization (FGD) systems.
Bulk Handling	Hopper discharge for dry powders, cement, and granules.

Technical Specifications

Parameter	Specification
Nominal Diameter (DN)	DN700 (27.5 Inch)
Design Type	Wafer, Uni-Directional
Actuation	Manual Handwheel (Rising Stem)
Connection Type	Wafer (Suitable for standard flange drilling, e.g., PN10/16 or ANSI 150)
Valve Body Material	Ductile Iron (GGG40/50, Epoxy Coated) or Carbon Steel (WCB)
Gate Material	Stainless Steel (SS304 / SS316)
Seat / Seal Options	Resilient Seated (e.g., EPDM, NBR) or Metal Seated
Stem Design	Rising Stem
Standard Compliance	Designed to meet common industry standards (e.g., MSS SP-81)
Working Temperature	Varies based on seat material (Consult datasheet)

Need a different size or automation? We offer customized valve solutions up to DN1200 with Pneumatic or Electric Actuation. Contact our sales team today to discuss your specific requirements.