• Knife gate valve
  • Knife gate valve

Knife gate valve

Material of knife gate valve:  A536,A126,WCB,WC6,LCB,CF8,CF8M.CF3.CF3M,CN7M,904L

Size of knife gate valve:  2inch(DN50) - 80 inch (DN2000)

Pressure of knife gate valve:  125LB(PN6)-150LB(PN16)

Connection type:  Flange(FF,RF)

Kind of drive :  Wrench,Gear,Electric actuators and pneumatic actuators

Operating temperature :   -100℃ - 600℃

Working medium :  Pulp,slurry,dust, etc.

Knife gate valve is a kind of gate valve which is shut off valve directly, the gate is slap type and gate head is design with bevel cutting edge, which has a cutting action to medium, Knife gate valves are suitable for those mediums contained fibers and solid particles, and sewage treatment systems. Operated by manual, pneumatic or electric actuators, knife gate valves are widely used in the process of automatic control systems in paper making, mining, chemical and sewage treatment industries, the internal structure of knife gate valve is very simple, so in the same size,  their price is cheaper than other type gate valve .


Features for knife gate valve:


1. lntegral body design, small flow resistance, smooth operation.


2. Stem drive is designed with2 plane bearings, the driving friction is greatly reduced so making operation of valve beoomes smooth andlight.


3. Seat with moveable sealing design and 0-ring oan provide a preloading foroe to push the seat sealing ring touohing tightly with gate whioh can provide a self oompensation to the sealing surface when it had been worn afterlong time in servioe, so its servicelife can be increased.


4. Fixed guide olaw, without groove design, so medium is not easyto be accumulated and blooked.


5. Material of seat is seleoted aooording to the medium and service condition, choosing metal seal or soft seal. Metal seal with gate surface is coated with hard ohromium, or Nitriding treatment, to increase its wear resistanoe. Soft seal will be with PTFE seat, or EPDM, NBR, which have good sealing performanoe and exoellent oorrosion resistance.


6. With excellent sealing performance and economical praoticality, and its operation can be by manual, pneumatic or eleotrio aotuator, so its application is very wide.



Category for knife gate valve:


Leakage rate of metal to metal seat test: MSS SP81-2001 40ml/inoh。


Shell test pressure shall be1.5times of PN the pressure rating determined for material at38℃listed in ASTM B16.34.


Seat test pressure shall be at2.8 Bar, Test Fluid shall be fresh water oontaining a oorrosion inhibitor.


Acceptance criteria of leakage rate for soft seat PTFE will be according to1/10 that of metal to metal seat.


Acceptance criteria of leakage rate for soft seat EPDM and NBR will be zero, i.e, no visible leakage.


Manual Type Cast Iron Knife Gate Valve



knife gate valve



2092-01

CONNECTION RATING:

JIS 5K JIS 10K JIS7.5K

ANSI 150

DIN PN10 PN16

Manual Type Cast Iron Knife Gate Valve

MSS-SP81 TEST STANDARD:

BODY TEST:11Kg/cm² (WATER)

SEAT TEST:2.8Kg/cm² (WATER)

LEAKAGE:4 cc/per in.min.



12 NUT CAST IRON
11 HAND WHEEL CAST IRON
10 PAWLS CAST IRON
9 BOLT NUT MILD STEEL
8 YOKE SLEEVE CAST BRONZE FCD
7 YOKE FC FCD
6 GLAND PACKING NON-ASB
5 GLAND CAST IRON
4 SEAT TEFLON METAL
3 STEM SUS410 '304 '316
2 PLATE SUS304 '316
1 BODY FC FCD
NO. SUBJECT MATERIAL

(FOR REFERENCE ONLY.)


DIMENSION TABLE:MM
SIZE L ØA ØB W H
2" 55 42 64 190 405
2-1/2" 55 57 80 190 420
3" 55 72 95 190 460
4" 55 92 114 220 520
5" 60 116 141 290 615
6" 60 138 161 290 685
8" 70 192 213 350 850
10" 75 232 261 350 1000
12" 80 280 315 400 1110
14" 80 345 376 400 1200
16" 90 395 425 500 1410
18" 95 445 480 500 1570
20" 120 490 520 500 1700
24" 120 590 630 500 1970

(FOR REFERENCE ONLY.)

MATERIAL::
BODY PLATE SEAT

GLAND

PACKING

MATERIAL

FCD.FC

WCB



SUS304

SUS316

SUS304L

SUS316L

TEFLON

METAL

VITON

EPDM

NON-ASB+PTFE

TEFLON

NON ASBESTOS



TEMPERATURE:
MATERIAL TEM. RANGE

SILICON

VITON

TEFLON

NON ASBESTOS

-20˚ ~ 150˚C

-20˚ ~ 250˚C

-30˚ ~ 150˚C

-50˚ ~ 550˚C




Pneumatic Type Stainless Knife Gate Valve

knife gate valve



14 PAWLS SUS304
13 ACTUATOR AL ALLOY.FC
12 BOLT AND NUT SUS304
11 CONNECTER SUS304
10 NUT SUS304
9 NUT SUS304
8 POINTER SUS304
7 YOKE DUCTILE IRON
6 GLAND PACKING NON-ASB
5 GLAND SUS304
4 SEAT TEFLON
3 STEM SS41+HCr
2 PLATE SUS304.316.316L
1 BODY CF8.CF8M.CF3M
NO. SUBJECT MATERIAL

(FOR REFERENCE ONLY.)


DIMENSION TABLE:MM
SIZE L ØA ØB ØS H
2" 48 42 64 63 520
2-1/2" 51 57 80 63 570
3" 51 72 95 80 680
4" 51 95 120 80 755
5" 57 125 148 125 900
6" 57 150 175 125 960
8" 70 195 222 150 1160
10" 70 250 275 180 1440
12" 76 300 325 200 1605
14" 76 350 375 250 1860
16" 89 400 430 250 2070
18" 89 435 475 250 2200
20" 114 480 515 300 2400
24" 114 580 620 300 2750

(FOR REFERENCE ONLY.)

MATERIAL::
BODY PLATE SEAT

GLAND

PACKING

MATERIAL

CF8

CF8M

CF3M


SUS304

SUS316

SUS304L

SUS316L

TEFLON

METAL

VITON

EPDM

NON-ASB+PTFE

TEFLON

NON ASBESTOS



TEMPERATURE:
MATERIAL TEM. RANGE

SILICON

VITON

TEFLON

NON ASBESTOS

-20˚ ~ 150˚C

-20˚ ~ 250˚C

-30˚ ~ 150˚C

-50˚ ~ 550˚C





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