Stainless Steel Knife Gate Valve
MVS Stainless Steel Knife Gate Valve is available in Wafer, Lugged and Flanged End Connection in size range of 50 mm to 2500 mm having pressure rating of Class 150. Knife Gate Valve Seat Options Include Metal Seat and Resilient Seat which can be offered as Unidirectional and Bidirectional. MVS Knife Gate Valve can be operated through Hand wheel (rising stem and non-rising stem), Chain wheel, Lever, Bevel Gear, Electric Actuator, Pneumatic Cylinder and Hydraulic Actuator.
MVS offers Soft and Metal Seated Stainless Steel Knife Gate Valve in Unidirectional and Bidirectional design in manual and pneumatic options. Knife Edge Gate Valves are specially designed for tough applications. Slide Gate Valves features a single piece full port cast stainless steel body fully lugged which is very robust in construction to cater to the extreme demanding applications and ensure greater flow capacity and minimal pressure drop.
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.
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
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, Flangless
Two Lugs, Wafet 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, Electic Motor, Chain Wheel,Lever
10) Body Design : Full Round Port / “V” Notch Port / Square Port
MATERIAL OF CONSTRUCTION :
1) BODY :
MVS Knife Gate Valve body is made of One-Piece Solid, Rugged and Heavy Duty casting including flanges. Knife Edge Gate Valve design ensures minimum contact between the internal trim parts of valve, Reduce wear & Tear. MVS Knife Gate Valve are available in Uni-Directional and Bi-Directional Body design in foll M.O.C. :
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 :
MVS Knife Edge Gate Valve incorporate thicker knife gate to eliminate distortion under maximum differential pressure and to provide tight seating. Precision machined and buffed gate provide long life of seating components and cuts even heavy or high-viscous fluids.Precision finish gate sealing face is lapped to provide the best possible seat tightness and is available in foll M.O.C. :
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 :
MVS Knife Gate Valve are provided with a Corrosion Resistance, Stainless Steel stem that assures easy, smooth, long life operation and dependable services. Knife Edge Gate Valve also can supply with stem cover on request for additional protection against dust while the valve is in the open condition. MVS Knife Gate Valve can be offered with EXTENDED STEM ARRANGEMENT up to 80″ (2000 mm) and are available in RISING STEM AND NON-RISINGS STEM DESIGN, Stem M.O.C. is as under :
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 :
Smooth fully machined packing chamber, cast gland follower, multiple packing and true leveling provide uniform compression of packing and it gives zero leakage from gland portion. Different varieties of packing materials to suit condition provide total sealing, various M.O.C. in gland packings are as under :
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 :
MVS Knife Edge Gate Valve are available in both Integral whereas Renewable type of seats. For highly abrasive applications we can supply a replaceable seat ring with a hard faced knife surface. Replaceable Seat extends the service life of the valve. Resilient seats can be easily replaced after removing valve from the line without complete dismantling.
A. INTEGRAL METAL TO METAL SEAT
B. RENEWBALE 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.