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Gate Valve

Hydraulic gate valve


Flow Control Valves


The Gate Valve block models a valve consisting of a round orifice in the valve housing and a flat gate, which moves perpendicular to the orifice axis. The orifice in the gate has the same diameter as the orifice in the housing. As the gate moves, it opens or closes the valve passage (shown as a shaded area in the following illustration).



qFlow rate
pPressure differential
pA, pBGauge pressures at the block terminals
CDFlow discharge coefficient
A(h)Instantaneous orifice passage area
x0Initial opening
xGate displacement from initial position
hValve opening
DOrifice diameter
ρFluid density
νFluid kinematic viscosity
pcrMinimum pressure for turbulent flow
RecrCritical Reynolds number
DHValve instantaneous hydraulic diameter
AleakClosed valve leakage area

Connections A and B are hydraulic conserving ports. Connection S is a physical signal port that controls the gate displacement. The block positive direction is from port A to port B. This means that the flow rate is positive if it flows from A to B, and the pressure differential is determined as . Positive signal at the physical signal port S opens the valve.

Basic Assumptions and Limitations

  • No inertial effects are taken into account.

Dialog Box and Parameters

Valve orifice diameter

The diameter of the valve orifice. The orifices in the valve housing and in the gate have the same diameter. The default value is 0.01 m.

Initial opening

The initial opening of the valve. The parameter can take both positive and negative values. The default value is 0.

Flow discharge coefficient


Critical Reynolds number


Leakage area


Global Parameters

Parameters determined by the type of working fluid:

  • Fluid density

  • Fluid kinematic viscosity



The block has the following ports:


Hydraulic conserving port associated with the valve inlet.


Hydraulic conserving port associated with the valve outlet.


Physical signal port that controls the gate displacement. The signal applied to this port is treated as translational motion, in meters.

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