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Full Flange Knife Gate Valve

Wey Knife Gate Valve Models NA, A1 & W1

Section view - sides of valve. Gate is guided in machined groove with large diameter seal mechanically retained to seal gate edge. This design provides dual metal/resilient seating and gate support with pressure from either side of gate.

Unique transverse seal eliminates stuffing box and permits repacking under full pressure and without system shutdown. Available in a variety of special scraper and seal configurations for tough applications.

Unique mechanically retained resilient seal with metal backup seat for bi-directional bubble-tight shut-off.

Unique bi-directional design. Gate is guided and supported for smooth full pressure differential operation throughout entire stroke with flow in both directions.

Unique contoured hydrodynamic interior body design promotes flushing to prevent buildup of deposits in seating area.

Unique solid steel or stainless steel topworks provide maximum strength to prevent damage due to operator abuse or vibrating conditions.

Unique non-rising stem design saves space and reduces stem nut repair problems.

Wey Knife Gate Valve Models NA, A1 & W1

The Wey Knife Gate Valve Models NA, A1 and W1 combine rugged construction with time tested design refinements found in no other knife gate valve. If you are plagued with knife gate failures, try a precision-built Wey Knife Gate Valve. You’ll wish all your knife gate valves were Wey Knife Gate Valves.

Model NA Standard face-to-face with threaded flange bolt holes. (Drill-thru flange bolt holes optional.)

Model A1 Wider face-to-face with threaded flange bolt holes for back-flange bolt nut connection. (Threaded flange bolt holes optional.)

Model W1 Model W1 body style conforms to MSS SP-135 face-to-face. Specify drill-thru or threaded flange bolt holes. ANSI 150 flange bolt hole size and pattern. Wider face-to-face permits pipe flange connection with bolt nuts tightened against back faces of valve body flanges suitable for dead-end service with either pipe flange removed.

Models

n

n

n

n

n

n

Features

ISO 9001-2008/PED-Annex III (Mod H)

Resilient Transverse Seal Various elastomeric and polymetric seal materials. Includes compression loaded scraper blades to wipe gate clean and protect seal. Repackable in service and under pressure/vacuum.

Section view - bottom of valve. Mechanically retained resilient seal insures bubble-tight shut-off with pressure on either side of gate. Seal will not pull out of specially machined groove.

Contoured seat flushes out solids which are pushed ahead of the gate in the seat groove while closing.

Section of transverse seal illustrating how sealing compound is inserted into seal chamber to repack valve while valve is in service.

See live demonstration

Body Styles

Model NAPer illustration, valve body has TAPPI, MSS-SP81 face-to-face with threaded flange bolt holes. Pipe flanges attach to valve with machine bolts from both sides without the use of bolt nuts, suitable for dead-end service. Optional drill-thru flange body style (not illustrated) permits use of long bolts which pass through both pipe flanges and valve flanges with bolt nuts to secure flanges and valve assembly together, but not suitable for dead-end service.

Model A1Per illustration, Model A1 body style is slightly wider face-to-face with drill-thru flange bolt holes. Wider face-to-face permits pipe flange connection with bolt nuts tightened against back faces of valve body flanges suitable for dead-end service with either pipe flange removed. Optional threaded valve flange bolt holes (not illustrated) also available. MODEL A1 MODEL W1

Actuator Options Accessories

HandwheelChainwheelSquare drive nutManual bevel gearPneumatic cylinderHydraulic cylinderElectric actuator

Note: Consult factory for details

Solenoid Lock-outMechanical limit switches Position indication scaleProximity switches OSHA yoke guardWear ring Scale cutterPneumatic positioner Powder-Pac optionElectronic positioner V-Port insert

MODEL NA

Model W1Per illustration, Model W1 body style conforms to MMS SP-135 face-to-face. Specify drill-thru or threaded bolt holes. ANSI 150 flange bolt hole size and pattern. Wider face-to-face permits pipe flange connection with bolt nuts tightened against back faces of valve body flange suitable for dead-end service with either pipe flange removed.

Mechanically retained resilient seat with wear ring and overlay option

Wear Ring Options n Ni-hard n Tool Steel n Ceramic

Section viewMechanically retained resilient seal insures bubble-tight shut-off with pressure on either side of gate. Seal will not pull out of specially machined groove.

Pipe I.D. Lining n Chrome Carbide n Tungsten Carbide n Urethane

Chrome Carbide or Urethane Liner

HVAF

Elastomer Seat(mechanically retained)

Gate

Chrome Carbide Overlay

Hardened Wear Ring

HVAF

Body

DRAWINGS TO COME?

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©2015 Wey Valve, Inc.All information for reference only. Modifications reserved.

Consult factory for valve size 42”-80” dimensions.NA Model Valve and W1 (conforms to TAPPI and MSS SP81 Face-to-Face standard.)Optional A1 Model Valve Face-to-Face

Important note: All dimensions subject to change. Consult factory for certified dimensions.

Valve Size

2"A

3.94

1.973.15

2.255.90

9.8711.8113.7815.7517.72

–

––––––––

–

22.7521.25

7.50

14.2517.0018.75

6.00

29.50 3/4"

–KNPT

–

11.5021.29

19.6815.7515.75

19.6819.68–

9.5011.75

25.00

3"4"6"8"

10"12"14"16"18"20"24"30"36"

7.84

23.6229.5235.43

B

–

8.269.84

Dimensions

36.0042.75 –

–

28.93

11.50

14.75

5/8"5/8"5/8"3/4"3/4"7/8"7/8"

1.00"1.00"

1-1/8"1-1/8"1-1/4"1-1/4"1-1/2"

18.15

24.75

3/4"3/4"

3030

111.5097.50

3/4"3/8"3/8"3/8"3/8"1/4"1/4"

12.50

1/4"40.50

121216161818182424 86.25

1.260.760.780.590.780.690.620.56

20

–4.75

15.3513.70

––

56.2045.8742.7539.3434.9030.8125.70

19.3322.72

10.77

11.81

11.8111.81

15.7524.84

14.7514.7514.75

16.7523.50

24.5024.50

2.754.004.122.502.883.123.253.623.754.124.505.008.269.84

1.872.002.00

2.752.753.003.003.503.504.504.504.624.62

B1 B2 C D

46.0038.7032.0027.5025.0023.5021.0019.0016.0013.5011.009.007.506.00

E F G6.307.877.87

––

H J–––

33.9835.7440.75

53.7563.7784.50

44.66

1/4"1/4"1/4"

L

––

M N O P

–––

74.2567.5061.5054.2544.2138.9033.5728.89

20.2525.2527.00

24"20"18"16"14"14"12"12"10"8"6"4"4"4"

1.121.731.77

2420201212

888

44

Sizes and Dimensions

For optional cylinder sizes and dimensions consult the factory.

B = Model NA face-to-face (per TAPPI/MSS-SP-81)B1 = Model A1 (Special wide face-to-face)B2 = Model W1 face-to-face (per MSS-SP-135)K = Cylinder port size 4”-12” Typ. SISTAG Cyl.N = Cylinder diameter not actual outside dimension

Note: Standard cylinders are shown. (Other sizes are available)O = Depth of blind tapped holes in chest area of valveP = Number of blind tapped holes in chest area per valve

Note:Bevel Gears (3:1) are recommended for 6”-10” valvesBevel Gears (4:1) are recommended for 12”-24” valvesBevel Gears (6:1) are recommended for 30” and larger valvesConsult factory for special applications

Handwheel Pneumatic CylinderBevel Gear