A gate valve (Figure 72) is characterized by head
losses
of the form:
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(31) |
where is a head loss coefficient depending on the ratio
,
is the mass flow, g is the gravity acceleration and
is the
liquid density.
is the cross section of the pipe,
is a size for the
remaining opening (Figure 72) and
is the diameter of the pipe.
Values for
can be found in file ``liquidpipe.f''.
The following constants have to be specified on the line beneath the *FLUID SECTION, TYPE=PIPE GATE VALVE card:
The gravity acceleration must be specified by a gravity type
*DLOAD card defined for the elements at stake. The material
characteristic can be defined by a
*DENSITY
card.