scale range of the gauge shall be approximately 150 percent of the maximum
pressure of the line in which installed. Gauges shall be the safety type
with solid fronts and blowout backs. Each gauge shall be provided with a
pressure snubber. [Gauge mounting shall be as indicated on the drawings.]
[The pressure gauges shall be panel mounted and readable from the front of
the power unit after opening the doors of the enclosure.] Gauges and gauge
lines shall be bottom tapped in horizontal pressure lines.
2.1.11.2
Thermometer
A direct indicating thermometer shall be provided to indicate fluid
temperature in the reservoir. Mercury shall no be used in thermometers.
[The thermometer shall be of the bimetallic type [mounted directly on the
reservoir] [and panel mounted as for the pressure gauges].] [The
thermometer shall be remote reading, capillary tube-and-bulb type, and
panel mounted.] The thermometer shall have a minimum 75 mm 3 inch dial
with black markings on a white background. The scale range shall be minus
5 to plus 115 degrees C. 20 to 240 degrees F. The case and stem shall be
corrosion resistant, and the wetted components shall be stainless steel.
Thermometer wells of the separable socket type shall be provided for each
thermometer with a direct type bulb.
2.1.12
Valves
Valves shall have a minimum pressure rating of [_____] kPa psi unless
stated otherwise. Valves 25 mm 1 inch or larger shall have socket-welded
piping connections. Valves less than 25 mm 1 inch shall have SAE straight
thread ends and [Buna N] [Viton] O-rings with tube fittings. Valves shall
be specifically designed and rated for hydraulic system applications.
2.1.12.1
Ball valves shall be made of stainless steel and designed for use with
hydraulic oil. Pipe connections shall be socket welded. The valves shall
have replaceable seats and be repairable without disturbing the welded
connections.
2.1.12.2
Needle valves shall be made of stainless steel and designed for fine flow
regulation. The stem sealing O-rings shall be [Buna N] [Viton].
2.1.12.3
Control Valves
a. Flow - Flow control valves shall be [subplate mounted for
socket-welded piping] [line mounted]. The valves shall be
pressure-compensating, free flowing in one direction, and adjustable.
The valves shall be capable of being locked in position to prevent an
unintentional adjustment. The flow rating shall be [a minimum of
[_____] L/sgpm] [determined by the Contractor in accordance with the
design criteria stated in paragraph DESIGN PARAMETERS].
b. Manual Four-Way Directional Control Valves - Manual four-way
directional control valves shall be the rotary shear seal type, open or
closed center and detent or spring centered as shown. The valve shall
be three position, [subplate mounted with socket-welded piping
connections] [line mounted]. 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].
SECTION 15010A
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