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| HAWA
ENGINEERS LIMITED is the manufacturer
of Industrial Valves and precision engineering
goods, Our range includes a wide range of
products, mainly Gate, Globe, Check, Pressure
Reducing, Control & Safety Relief Valves
as well as Strainers, Steam Traps etc. for
application in various industries. |
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Standardisation |
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| All Products
are manufactured in accordance with the guidelines
set by standardisation institute all over
the world such as the Indian Boiler Regulation
(IBR), Manufacturers Standardisation Society
(MSS), American Petroleum Institute (API),
American Society of Mechanical Engineers (ASME). |
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Procurement
Of Raw Materials |
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| In the manufacturing
process we require steel casting of various
grades, stainless stell round bars, forging,
hardware (nuts & bolts), gaskets, paints
and also packing materials. We purchase all
the raw materials from the approved suppliers. |
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Quality
Assurance |
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| All raw materials
are checked by our Internal Quality Assurance
Department prior to infusion into the manufacturing
process. For example, when we receive steel
castings and rods, it is checked and then
possed on to stores with an "INWARD PASSED"
sign and stamp, if it is rejected it is sent
back to the supplier with a G.I.R. note. |
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Machining |
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| The raw materials
is issued to the machine shop for machining
through material requisition slips. Valve
body, bonnet, valve seat, spindles etc. are
machined on centre lathe machine, after which
all the components are checked by vernier
callipers or micrometers. |
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In-Process
Testing |
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| If it is
found to be OK dimensionally and visually,
the valve body and bonet are sent for Hydrostatic
Testing to the testing yard and other components
are sent to the fitting / assembling department.
All the bodies and bonnets are tested on Motorised
Hydrostatic Pumps or on Hand Operated Pumps.
A pressure test is carried out as per relevant
world standards. The theory being, when the
body or bonnet is under pressure there should
not be any leakage or drops of the testing
and fluid from any portion of the bodies and
bonnets. If there is any leakage observed,
it is rejected and sent back to the foundries. |
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Assembly |
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| The body
and bonnet which are hydrostatically OK are
sent to the fitting shop for assembly, duly
handled with care so that there are no scratches
on the machine surfaces. In the fitting shop,
body and bonnets are drilled on drill machine
with the help of jigs and fixtures for uniformity
and interchangeability by Quality Assurance
Department and passed, or sent back. |
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Lapping |
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| In some cases
lapping of the seats and plugs / other components
is done prior to fitting, whereas in other
cases lapping is done after fitting. |
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Testing |
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| After
assembly the new complete valve, is sent for
hydrostatic testing again. If no leakage is
observed, as per the relevant standards, it
is sent to the finishing department. |
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Finishing/Painting |
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Here the
valve body surface is debarred and finished
by sanders and flexible shaft grinders for
better appearance and smooth finishing. One
coat of corrosion resistant primer (red oxide)
is sprayed, and if any uneven surface is observed
a high temperature putty is used, after which
selected colours for different types of valves
are sprayed twice for a superior surface look.
Here it should be noted that valves which
are manufactured for IBR approval are not
painted initially. They are offered for inspection
by the concerned inspectors without paint,
but in a completely assembled stage. The IBR
number allotted is then punched after inspection,
and paintings is done only after this. |
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Final
Inspection |
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| After painting,
final inspection is done by our Quality Assurance
Department / Third Party Inspection Agency,
whose responsibility now is to co-relate and
check all records relating to the valve concerned.
Special attention is paid to co-relate all
the serial numbers and in-process quality
checks, a valve serial number and then passed
on to the packing department. |
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Packing |
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| In the packing
department all the valves are covered with
polythene bags and placed into wooden case,
with a bed of grass for non-damage of valves.
It is then covered and nailed with a packing
note and valve users manual / maintenance
guidelines for the despatch department. |
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Despatch |
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The despatch
department checks all the details mentioned
in the packing note and the purchase order,
and send the package to the godown or to the
transporter.
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