14
Hydraulic Systems
Check Valves
Check Valves and Relief Valves
A check valve is shown as a ball in a V seat. When
oil pressure is applied to the left side of the ball, the
ball is forced into the V and no oil can flow. When oil
pressure is applied to the right side of the ball, the
ball moves away from the seat and oil can flow past
it. A by-pass check is a one way valve with a spring
on the ball end of the symbol. This shows that
pressurized oil must overcome the spring pressure
before the ball will unseat.
Relief Valves
A relief valve is shown as a normally closed valve
with one port connected to the pressure line and the
other line connected to the reservoir. The flow
direction arrow points away from the pressure line
and toward the reservoir. When pressure in the
system overcomes the valve spring, pressure is
directed through the valve to the reservoir.
Control Valves
Control Valves
A control valve has envelopes (squares) that
represent the valve spool positions. There is a
separate envelope for each valve position and within
these envelopes there are arrows showing the flow
paths then the valve is shifted to that position. All the
port connections are drawn to the envelope that
shows the neutral position of the valve. We can
mentally visualize the function of the valve in any
position. A valve that has parallel lines drawn outside
of the valve envelopes shows that this valve is
capable of infinite positioning. This valve usually
operated between the positions shown. An example
of this type of valve would be a flow priority valve or a
pressure regulating valve.
Valve actuators
The valve spools can be controlled a variety of ways.
The top picture (A) shows the symbol for a lever
control. The middle picture (B) shows the symbol for
a pedal control (foot operated). The lower control (C)
is an electric solenoid.
Toro University Technical Training
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Wikipedia's Page | Toro Company |
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