c. Pilot-Operated, Solenoid-Controlled Four-Way Directional Control
Directional - Pilot-operated, solenoid-controlled four-way directional
control valves shall be [two] [three] position and [open] [closed]
centered as shown. The valve shall be pilot operated and have [a
single] [two] solenoid[s]. The valve shall be subplate mounted with
[socket-welded piping] [tubing] connections. The solenoids shall
operate at 120 volts AC. The flow rating shall be [a minimum of [_____]
L/s gpm] [determined by the Contractor in accordance with the design
criteria stated in paragraph DESIGN PARAMETERS].
2.1.12.4
Pressure relief valves shall be adjustable with a body designed for a set
pressure of [_____] kPa. psi. [The valve shall have the capacity to pass
[_____]L/s.gpm.] [The flow capacity shall be determined by the Contractor
in accordance with the design criteria stated in paragraph DESIGN
PARAMETERS.]
2.1.12.5
Unloading Valves
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NOTE: Unloading valves provide free passage through
a low pressure area when a signal is applied to a
pilot connection. An unloading valve is normally
located in the pump discharge line so that the pump
can unload to the tank at a preset pressure. In a
typical application, unloading valves may be
arranged to accept a signal from an accumulator. At
a predetermined pressure value, when the accumulator
is charged to the preferred level, the pump unloads
to the tank.
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Unloading valves shall be adjustable and designed for [_____] kPapsi
service. The pressure setting shall be as shown, and the flow capacity
shall be determined by the Contractor so that the valve operates without
cavitating.
2.1.12.6
Supply Spring Loaded Check Valves
Supply spring loaded check valves shall be of stainless steel construction
and shall be the ball or poppet type with a body designed for high shock
and [_____] kPa psi service.
2.1.12.7
Return Spring Loaded Check Valves
Return spring loaded check valves shall be of stainless steel construction
and shall be the ball or poppet type with a body designed for [_____] kPa
psi service. Cracking pressure shall be [_____] kPa. psi.
2.1.12.8
Bleeder Valves
Bleeder valves shall be 8 mm, 1/4 inch, stainless steel construction, and
wrench operated.
2.1.12.9
Pressure Snubbers
Pressure snubbers shall be provided for all pressure gauges and pressure
SECTION 15010A
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