A manual slide gate valve(also known as a manual knife gate valve)is a linear-motion industrial valve designed to start,stop,or regulate the flow of fluids,slurries,or dry bulk solids by means of a manually operated sliding gate(blade).

1.Working Principle

The valve features a flat,sturdy gate that slides perpendicular to the flow direction.

Full Open:The gate is fully retracted,allowing unobstructed,full-bore flow.

Full Closed:The gate is fully extended across the flow path,creating a tight seal to stop the flow completely.

Manual Operation:Actuated by a handwheel,lever,or chain,which turns a screw to move the gate up/down or in/out.

2.Key Features

Simple&Compact Design:Few moving parts,easy to install and maintain.

Full Bore Flow:Minimal pressure drop when fully open.

Reliable Sealing:Available in soft-seal(rubber/EPDM)or hard-seal(metal-to-metal)options for leak-tight performance.

Bidirectional Flow:Can be installed in either direction without affecting performance.

Space-Saving:Short face-to-face length,ideal for tight installations.

3.Materials of Construction

Body:Carbon Steel(WCB),Stainless Steel(304/316),Cast Iron.

Gate:Stainless Steel,Hardened Steel.

Seal:EPDM,NBR,PTFE,Metal.

Stem:Stainless Steel.

4.Typical Applications

Wastewater&Sewage:Sludge,grit,and raw sewage isolation.

Chemical&Petrochemical:Corrosive or abrasive fluids,high-pressure differential systems.

Pulp&Paper:Fiber suspensions and stock flow control.

Power Plants:Ash slurry and cooling water lines.

Dry Bulk Handling:Powders,granules,and pellets in silos,hoppers,and conveyors.

5.Technical Specifications

Size Range:DN50~DN1200(2”~48”).

Pressure Rating:PN10~PN16(Class 150~300).

Temperature Range:-10°C to+200°C(depending on seal material).

Connection:Flange(GB/T,ANSI,DIN),Wafer,Lug.

6.Advantages

Low Cost:Economical compared to motorized or pneumatic valves.

Easy Operation:No power source required;simple handwheel operation.

Minimal Maintenance:Robust design with low wear and long service life.

Versatility:Suitable for liquids,slurries,and dry solids across various industries.