KINGNA TRADING

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Heavy-Duty Slurry Knife Gate

Industrial valves and fittings dispatch fast — wear parts and complete machines quoted on request.

Knife Gate Valves

Knife gate valves for slurry, tailings, dust and fibre-laden media — general, through-port, dust-tight and heavy-slurry builds. Images are representative renderings of each series; finish, accessories and nameplate follow the confirmed drawing.

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The ZKPZ43 is the heavy-duty version of the slurry knife gate, built for the extreme end of the duty range: high solids concentration, coarse particles and strong scouring. Compared with the standard slurry valve it carries a thicker body, a reinforced gate and a harder-wearing rubber seat, so it holds up where impact and abrasion wear ordinary gates through. Both seats are moulded rubber, self-sealing under line pressure and bi-directional; the two-piece body is machined to eliminate the packing gap, the gate runs in machined guides, and the recessed bottom cover allows flushing. Sizes DN50–DN1000, PN10 / PN16 / PN25 / PN40 or 150LB / 300LB, working pressure 10 / 20 / 40 bar, −29 to 150 °C, media up to 65 % solids.

General Specifications

Size RangeDN50 – DN1000 (larger sizes on request)
Pressure RatingPN10 / PN16 / PN25 / PN40 · 150LB / 300LB
Working Pressure10 / 20 / 40 bar
Flange DrillingEN 1092 / ASME B16.5 / HG/T 20592 / GB/T 9124.1 / AS 2129 / AS 4087
Face-to-FacePer manufacturing partner's standard — custom lengths available
Flow ControlOn / off isolation — not for continuous throttling
Sealing DirectionBi-directional
OperationHandwheel, bevel gear, pneumatic, electric or hydraulic
MediaTailings, heavy slag, coal slag, steel slag and slurry with up to 65 % solids
Temperature−29 to 150 °C

Materials & Coating

BodyCast iron / carbon steel / stainless steel / duplex steel — heavy-wall build
GateReinforced precision-machined knife gate with cavity guides
SeatReplaceable heavy-duty resilient seat — NR or EPDM
Body ConstructionTwo-piece split body, machined for a gap-free cavity
Stem SealingMoulded packing with a dedicated upper seal
DrainRecessed bottom drain cover for flushing

Applications

High-pressure tailings transport Heavy-medium coal washing Steel and smelting slag lines Lithium and rare-earth leach slurry

Higher ratings, thicker sections, different materials

The heavy slurry build is the same knife gate principle at higher line ratings and larger sizes, with body and gate material upgraded as the rating climbs — carbon steel for the lower ratings, stainless and alloy grades where the medium demands it.

The higher the rating, the more the operator becomes a selection issue: above the sizes where a handwheel can be turned comfortably, a hydraulic or pneumatic cylinder with a support frame is the normal arrangement.

What decides the build

Line rating, size, solids size and concentration, and how often the valve cycles. A valve that cycles once a shift and a valve that cycles every few minutes are not the same specification even at the same rating.

More from this series

Heavy-Duty Slurry Knife Gate — 1

Related guides