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### Pipe, Gate Valve

Figure 72: Gatevalve

A gate valve (Figure 72) is characterized by head losses of the form:

| (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.