FUNCTION
The swing check valve
is designed so that it is opened automatically at the forward
flow and closed at the reverse flow in horizontal or vertical
(upward flow only through valve) piping runs. It has an
advantage of low pressure drop and therefore is best suitable
for velocity application.
BODY
The body has a spherical form with large radius, which permits
the stress, turbulence and resistance to flow to be kept
minimum. The bonnets on valve are equipped with back seat rings.
BODY-COVER JOINT
Body-cover joint of
swing check valve is machined as follows:
Class 150 : Male and female.
Class 300 and 600 : Male and female.
Class 900 higher class : Ring joint.
We can supply any kinds of gasket as required by customer.
SEAT RING
The seat ring as a welded-in type is designed to prevent any
turbulence and damage by corrosion. It is are forged or rolled
into one piece for all dimensions, heat treated to obtain the
desired surface hardness, and cleaned thoroughly before
assembling.
END CONNECTIONS
In our standard
production of valves, the flange ends (RF) and the face to face
dimensions conform to ANSI B16.5 and ASME B 16.10, respectively,
and they have a raised face serrated finish type or other finish
type as requested.
For butt-welded ends (B.W), of which the end to end dimension
conforms to ASME B16.1 0, customer must specify the schedule
type required, pipe class, or bore diameter.
Ring joint flanged ends (R. T.J) conform to ASME B16.5 and the
end to end dimension follows ASME B16.1 O.
The other special end connections may be supplied as required by
customer.
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