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Knife Gate Valve

1. Product Overview

knife gate valve

A manually operated knife gate valve, handwheel, lug type, 150LB.

The knife gate valve, also known as “slurry gate valve”, is a special parallel gate valve that is designed to handle slurry, including fibrous material. It has a sharp edge on the bottom of the gate to shear particulates or other solids in suspension as well as to separate slurry. Knife gate valves can be made from various materials covering cast iron, carbon steel, alloy steel and stainless steel. They are widely used in power plant, urban sewage treatment, pulp and paper industry, mining, food and beverage, pharmaceutical, petroleum as well as chemical industries.

Design Standards: MSS SP 81, ASME B16.34, API 598, ASME B16.5, ASME B16.47, BS 5157, JB/T 8691, DIN, JIS, EN standards. Eight series of knife gate valves are available: MTA, MTB, MTC, MTD, MTE, MTF, MTG, MTH.

Design Features: metal or soft seated; yoke & bolted bonnet, through conduit, or bonnetless; wafer type, lug type, flanged type; rising stem or non-rising stem; operation: handwheel, bevel gear, pneumatic actuator, electric actuator, hydraulic actuator, sprocket wheel(chain-wheel); positioning device; short face-to-face length; stable operation, vibration & noise proof; easy maintenance; pressure ratings: 100 psi ~ 500 psi, PN10 ~ PN25; size: 2″ ~ 80″ (DN 50 ~ DN 2000).

2. Optional Operation Methods

IIIIIIIV
handwheel operated knife gate valveSprocket(Chain Wheel) Operated Knife Gate ValveLever Operated Knife Gate ValveBevel Gear Operated Knife Gate Valve
VVIVIIVIII
Pneumatic Drive Knife Gate ValveHydraulic Drive Knife Gate ValveElectric Drive Knife Gate ValveElectric & Hydraulic Hybrid Knife Gate Valve
The operation methods for knife gate valves:
Manual: I-Handwheel, II-Sprocket(Chain Wheel), III-Lever, IV-Bevel Gear;
Automated: V-Pneumatic, VI-Hydraulic, VII-Electric, VIII-Electric & Hydraulic Hybrid.

3. Conventional Material Selection

Soft Seal

Explosive View of Soft Seal Knife Gate Valve

Part 1 of explosive view of soft seal knife gate valvePart 2 of explosive view of soft seal knife gate valve
Item No.Part NameStainless SteelCarbon Steel
1BodyASTM A351 CF8MASTM A216 WCB
2ScrewASTM A193 B8ASTM A193 B7
3RetainerASTM A182 F316ASTM A105N+ENP
4Blade/GateASTM A420 316ASTM A420 304
5Seal RingRTFERTFE
6O-RingEPDMEPDM
7PackingPTFEPTFE
8StudASTM A193 B8ASTM A193 B7
9Lock NutASTM A194 8ASTM A194 2H
10YokeASTM A351 CF8ASTM A216 WCB
11StemASTM A182 F304ASTM A182 F6a
12BearingSS316+PTFEASTM 52100
13Sleeve GlandASTM A182 F304AISI 1035
14Stem NutASTM A439 D2ASTM A439 D2
15HandwheelDuctile IronDuctile Iron
16Handwheel NutASTM A194 8ASTM A194 2H
17StudASTM A193 B8ASTM A193 B7
18Lock NutASTM A194 8ASTM A194 2H
19StopperSS304AISI 1025
20Grease NippleSS304SS304
21BoltASTM A193 B8ASTM A193 B7
22Lock NutASTM A194 8ASTM A194 2H
23Gland FlangeASTM A351 CF8ASTM A216 WCB
24BoltASTM A193 B8ASTM A193 B7
25NutASTM A194 8ASTM A194 2H
26WasherSSCS
27PatchingEPDMEPDM
Typical material selection for soft(resilient) seal knife gate valves. Other materials are available upon request.

Metal Seal

Explosive View of Metal Seal Knife Gate Valve

Part 1 of explosive view of metal seal knife gate valvePart 2 of explosive view of metal seal knife gate valve
Item No.Part NameStainless SteelCarbon Steel
1BodyASTM A351 CF8MASTM A216 WCB
2StopperASTM A276 316ASTM A276 304
3BladeASTM A240 316ASTM A240 304
4PackingPTFEPTFE
5StudASTM A193 B8ASTM A193 B7
6Lock NutASTM A194 8ASTM A194 2H
7YokeASTM A351 CF8ASTM A216 WCB
8StemASTM A182 F304ASTM A182 F6a
9BearingSS316+PTFEASTM 52100
10GlandASTM A182 F304AISI 1035
11Stem NutCopper Alloy D-2Copper Alloy D-2
12HandwheelDuctile IronDuctile Iron
13Handwheel NutASTM A194 8ASTM A194 2H
14Grease NippleStainless SteelCarbon Steel
15BoltASTM A193 B8ASTM A193 B7
16Lock NutASTM A194 8ASTM A194 2H
17Gland FlangeASTM A351 CF8ASTM A216 WCB
18BoltASTM A193 B8ASTM A193 B7
19NutASTM A194 8ASTM A194 2H
20WasherStainless SteelCarbon Steel
21PactchingEPDMEPDM
Typical material selection for metal seal knife gate valves. Other materials are available upon request.

4. Engineering Specification: Torque Value & Thrust Force

Soft Seated

NPS2"2-1/2"3"4"6"8"10"
Torque(N*m)10121426273252
Thrust(KN)1.51.82.23.35.69.414.4
NPS12"14"16"18"20"24"-
Torque(N*m)6894125154221288-
Thrust(KN)19.122.728.534.844.559.5-
Torque values and thrust forces for soft seal knife gate valves:
1. All torque values are calculated on the basis of room temperature and RTFE seat material.
2. In the case of actuator selection, a safety factor of 1.3~1.5 shall be take into account.
3. Thrust force values are calculated on the basis of 150 psi working pressure.
4. Deviations may exist if line fluid or trim material changes.

Metal Seated

NPS2"2-1/2"3"4"6"8"10"
Torque(N*m)14182239254575
Thrust(KN)1.72.32.64.37.513.520.2
NPS12"14"16"18"20"24"-
Torque(N*m)101141193237340470-
Thrust(KN)27.733.844.054.669.194.8-
Torque values and thrust forces for metal seated knife gate valves:
1. All torque values are calculated on the basis of room temperature and RTFE seat material.
2. In the case of actuator selection, a safety factor of 1.3~1.5 shall be take into account.
3. Thrust force values are calculated on the basis of 150 psi working pressure.
4. Deviations may exist if line fluid or trim material changes.

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Parallel Gate Valve

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