Jaw Gate Valve

Also known as a knife gate valve,slurry gate valve or pulp valve,the jaw gate valve is a compact,linear-motion industrial valve designed for reliable isolation and control of viscous,fibrous,or abrasive media.It features a sharp,knife-edged gate that shears through solids,fibers,and debris,making it ideal for demanding slurry and dry powder applications.

1.Construction&Components

Body:Short,wafer-style or flanged design(cast iron,carbon steel,stainless steel)for tight installation between flanges.

Gate(Jaw):Thin,sharp-edged metal plate(304/316 stainless steel)that cuts through solids;guided by wear-resistant seats.

Stem&Actuator:Rising or non-rising stem with manual handwheel,gear operator,or electric/pneumatic actuator for automation.

Sealing:Replaceable soft seals(EPDM,FKM,PTFE)or metal-to-metal seats for high-temperature/high-pressure service.

Bonnet:Optional enclosed bonnet protects the gate from environmental contamination(available in extended designs).

2.Working Principle

The gate moves vertically,perpendicular to flow:

Full Open:Gate retracts completely into the bonnet/body,creating an unobstructed flow path with minimal pressure drop.

Full Close:Gate descends,its sharp edge shearing through media and seating tightly against the seal to block flow.

Key Advantage:The knife edge cuts fibers,rags,and solids,preventing clogging common in standard gate valves.

3.Key Features

Compact Design:Wafer/short-body construction saves space and reduces weight.

Superior Shearing:Sharp gate handles slurries,pulp,sludge,and dry powders without jamming.

Bidirectional Flow:Seals in both directions,simplifying installation.

Low Maintenance:Simple structure with easily replaceable seals;self-cleaning gate reduces debris buildup.

Wide Pressure/Temp Range:Typically rated up to PN16(16 bar);temperature limits depend on seal material(-20°C to 200°C).

4.Applications

Pulp&Paper:Controls paper pulp,black liquor,and fiber suspensions.

Mining&Minerals:Isolates tailings,slurry,and coal ash in processing plants.

Wastewater Treatment:Manages sludge,sewage,and gritty water in treatment facilities.

Power Plants:Handles fly ash,bottom ash,and cooling water with suspended solids.

Chemical&Food:Processes viscous fluids,powders,and corrosive media(with compatible materials).

5.Material Options

Body:Cast Iron(CI),Ductile Iron(DI),Carbon Steel(WCB),Stainless Steel(CF8/CF8M).

Gate:304/316 Stainless Steel,Hardened Steel,or Coated Alloys.

Seals:EPDM(general),FKM(high temp/oil),PTFE(chemical resistance),Metal Seat(high temp).

6.Standards Compliance

Design:JB/T 8691,MSS-SP81,API 600(bonneted versions).

Face-to-Face:GB/T 12221,ISO 5752.

Flange:GB/T 9113,ANSI B16.5.

Summary

The jaw gate valve(knife gate valve)is a robust,cost-effective solution for isolating and controlling slurry,fibrous,and abrasive media.Its compact design,sharp shearing gate,and bidirectional sealing make it indispensable in pulp&paper,mining,wastewater,and power industries.