Knife Gate Valve

Knife Gate Valves incorporate gates made of stainless steel and other superior alloys are ground with super surface finish on both sides to assure positive shutoff. The machined and highly finished gland pockets ensure a leak proof gland packing and perfect stem seal. High Performance Knife Gate Valve are available in Uni-Directional / Bi-Directional design which provide better value and performance with many standard features which others lack.

Special Alloy Knife Gate Valves : All Alex Valves Automation Knife Gate Valve are available in these Special Alloys like Titanium Alloy, Zirconium Alloy, Nickel Alloy, Hastelloy Alloy, Inconel Alloy, Incoloy Alloy, Monel Alloy, Aluminium Bronze and Duplex Steel.

Both metal and resilient or soft seat option are available with a shutoff capability exceeding the requirements of the standard MSS SP – 81.

TECHNICAL SPECIFICATIONS – MVS KNIFE GATE VALVE :

1) Design Standard : MSS SP-81

2) F to F : As per MSS SP -81

3) Testing Standard : MSS SP -81

4) Size Range : 50 mm to 600 mm (Above on Request)

5) Pressure Rating : 50 mm to 300 mm – 150 psi

400 mm to 450 mm – 75 psi

500 mm to 600 mm – 50 psi

6) End Style : Full Lugs, Wafer Type, Flangeless

Two Lugs, Wafer Type, Flangeless

Flange Type, Wafer

7) Lug Options : a. BSP Threaded hole in chest area and lugs

b. BSP Threaded hole in chest area and through hole in Lugs.

8) Drilling : ANSI B 16.5 Class 150, BS 10 Table ‘D’ & ‘E’ , DIN, JIS, IS etc

9) Valve Operation : Cylinder, Bevel Gear, Electric Motor, Chain Wheel,Lever

10) Body Design : Full Round Port

MATERIAL OF CONSTRUCTION :

1) BODY :

a. Cast Iron to IS 210 GR. FG 200
b. Ductile Iron [S.G. Iron]
c. Cast Carbon Steel (ASTM A 216 GR. WCB)
d. S.S. 304 (ASTM A 351 GR. CF 8)
e. S.S. 316 (ASTM A 351 GR. CF 8M)
f. S.S. 304L (ASTM A 351 GR. CF 3)
g. S.S. 316L (ASTM A 351 GR. CF 3M)
h. Alloy 20
i. Hast Alloy C

2) KNIFE GATE :

a. Stainless Steel 304
b. Stainless Steel 316
c. Stainless Steel 304L
d. Stainless Steel 316L
e. Alloy 20
f. Hast Alloy C
g. Nitriding to approx 600-1250 HV1 surface hardness
h. Stelliting overlay on Gate Edge with min. 1.0mm thickness and min.40 HRC hardness
i. Any Other Special Gate Material

3) STEM :

a. Stainless Steel 410 (13% Cr.)
b. Stainless Steel 304
c. Stainless Steel 304L
d. Stainless Steel 316
e. Stainless Steel 316L
f. Alloy 20
g. Hast Alloy C
h. Any Other Special Material on request

4) GLAND PACKING :

a. Standard General Service Packing Material
b. P.T.F.E. Impregnated Asbestos, maximum temperature up to 210 C.
c. High Temperature Graphite Asbestos Packing Material
d. Pure P.T.F.E. Packing Materials, maximum temperature up to 230 C.
e. Food Grade Packing Material

5) SEAT OPTIONS :

A. INTEGRAL METAL TO METAL SEAT

B. RENEWABLE METAL TO METAL SEAT

C. RENEWABLE ELASTOMER RUBBER SEAT

D. RENEWABLE PTFE SEAT

E. DEFLECTOR CONE.

DESIGN AND TESTING :

Body- MSS SP-81 requires the valve body hydrostatically pressure tested to 1.5 times the rated working pressure.

• Valve rated pressure – 150 psi
• Body test pressure – 225 psi

Gate – MSS SP-81 requires the gate to be hydrostatically pressure tested to 1.1 times the rated working pressure.

• Valve rated pressure – 150 psi
• Gate test pressure – 165 psi

Seat – MSS SP-81 has an allowable leakage rate (for metal to metal seated valves) of 40 cc per inch of diameter, per minute at 40 psi pressure. On a 12″ valve this would be equal to 40 times 12, or 480 cc per minute at 40 psi.

• Maximum allowable leakage of 0.6 GPM when tested with water at 40 psi applied in the normal flow direction.
• No visible leakage when tested with water at 40 psi (for soft seated valves only).

Face to Face – MSS SP-81 has specified face-to-face dimensions and tolerances for each valve size to assure ease of installation for the consumer, regardless of the valve manufacturer.