SS Gate Valve Handwheel
Operated
Applicable standards:
Steel gate valves, API **0 / API 6D
Steel gate valves, ISO ****4 / ISO ****3
Steel valves, ASME B*6.*4
Face to face, ASME B*6.*0
Flanges end, ASME B*6.5
Buttwelding ends, ASME B*6.*5
Inspection and test, API **8 / API 6D
Design description:
Full port design
OS&y,outside screw and yoke
BB,Bolted bonnet
Flexible wedge,fully guided
Choice of solid or split wedge
Renewable seat rings
Forged T-head Stem
Rising stem and non-rising handwheel
Flanged or buttwelding ends
Available with BG operator
Gate Valve Product Details
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Design and Manufacture
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ANSI B*6.*4,API**0,API**3,BS***4
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Face to face(end to end)
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ANSI B*6.*0,API6D
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Flanged connection
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2"~*4" TO ANSIB*6.5,*2",*6"~*6" TO MSS-SP**4 to API **5
on Request
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Test and inspection
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API **8,API6D
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Butt welded end
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ANSI B*6.5
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A. Anti-friction ball thrust bearing: Reduces friction between
mating parts to ensure smooth operation
B. Grub screw: Secures yoke nut in the bonnet
C. Grease nipple: Supplies lubricant to the mating parts
Manufacturing Process
STANDAR3DISATION
All products are manufactured in accordance with the guidelines
of International Standard accepted all over the world such as
Manufacturers Standardisation Society (MSS), American Petroleum
Institute (API), American Society of Mechanical Engineers
(ASME), British Standard (BS), Bureau of Indian Standard
(BIS).
PROCURMENT OF RAW MATERIAL
In the manufacturing process we require Castings of different
grades, Stainless steel Bars, forgings, hardware, gaskets &
paints. All raw material purchase from the reputed &
genuine concerned supplier.
QUALITY CONTROL
All raw materials are checked by our Quality Assurance
Department prior to manufacturing process. For an example, when
we received the castings, it is checked visually and
dimensionally for machining tolerance. We also check the
foundry chemical Test Certificate and physical test
certificate, compared to suitable international standard and
passed to machining shop for the further process, if it is
rejected it is send back to the supplier.
MACHINING
The raw material issued to the machine shop for the machining,
is machined strictly as per the relevant drawings.
INPROCESS TESTING
If it is found OK dimensionally the valve body and bonnet are
sent for the hydro testing. All internal parts such as seat,
disc, stem are measured by the Vernier Caliper or micrometer,
if it is found O K than pass to assembly section for the
further assembly. All the valve body and bonnet are tested on
the motorized pump or hand pump as per the relevant standard.
The theory being, when the body or the bonnet is under pressure
there should not be any leakage or drops of the testing fluid
from any portion of the castings. If any leakage observed, it
is rejected and sent back to the foundries.
ASSEMBLY
The body and bonnet, which are Hydrostatically O K, are sent to
assembly section, duly handled with care to avoid the scratches
on the machined surfaces. In the assembly section body and
bonnet are drilled on drill machine with the help of jigs &
fixtures for uniformity and interchangeability.
LAPPING
In metal to metal seated valves, seat & disc/plug are
lapped by Rough Lapping Paste to smoothen the seating surface
and than lapped with very fine grade lapping paste for the
proper sealing of disc & seat surface, to ensure zero
leakage.
TESTING
After assembly of new complete valve is sent for Hydrostatic
Testing. If no leakage is found as per the relevant standard,
it is sent to finishing section.
FINISING/PAINTING & PACKING
The valve body and bonnet is debarred and finished by flexible
shaft grinders for better appearance. One coat of corrosion
resistance primer (red oxide) is sprayed, and colored as per
the codes, twice for superior surface look.
Valves are packed either in wooden boxes or Gunny bags duly
protected by ends enclosures and soft material to avoid any
damages during transit.
Main Features
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Body & Bonnet made from high quality casting with liberal
sections. The castings are precision machined for high
performance
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Bi-Directional Shut-Off
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Die moulded Graphite (Grafoil) Packing Rings, controlled
clearance between stem, gland and bonnet bushing for
guaranteed low emissions and also suitable for higher
temperature.
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Deep stuffing box is providing for tightness and maximum long
packing life.
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Swinging Eye Bolts facilitate easy access to the stuffing
box.
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Back seating feature facilitates repacking of the stuffing
box on line with the valve in fully open position.
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Seat Ring Screwed in to the body are replaceable type. Seal
welded type Seat Ring & Integral Seat cab also be offered
on special request.
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Stellited Disc, Seat Ring & Back Seat can also be offered
on special request.
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Higher Pressure & Higher Size Valves are provided with
Thrust Bearings and also with Gear drive arrangements.
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In built wear life for long duration of service.
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Material of Construction:
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Cast Iron
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: IS **0 Gr FG **0
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Cast Carbon Steel
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: ASTM A **6 Gr WCB
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Cast Stainless Steel
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: ASTM A **1 Gr CF 8/CF 8M
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Forged Carbon Steel
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: ASTM A **5
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Forged Stainless Steel
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: ASTM A **2 Gr F**4 / F**6
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End Connection
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: Screwed AS PER BSP/BSPT/NPT
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Socketweld
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: AS PER ANSI B *6.*1
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Flanged
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: AS PER ANSI B *6.5
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