Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: info@nelsonirrigation.com Web site: www.nelsonirrigation.com
6
75 SERIES BIG GUN SPECIFICATION
1. GENERAL:
The 75 Series Nelson Big Gun
®
sprinklers (models SR75 and F75) shall be capable of operating
in a pressure range from 40 PSI through 80 PSI. The nozzle size range is from .4” through 0.7”
for taper bore nozzles. Optional trajectory angles on the SR75 and the F75 shall be 18º and
24º. The gun shall be provided with optional connections at the base consisting of Nelson
Flange, Metric Flange, ANSI/DIN Flange types, 1 ½” 2” or 2 ½” Female NPT cast iron flange
adapters shall be optional accessories.
2. DESIGN
1. The
sprinkler bodysprinkler body
sprinkler bodysprinkler body
sprinkler body range tube and drive arm shall be of aluminum construction. The range
tube shall have non-clog straightener vanes extended the full length of the range tube to reduce
turbulence and provide greater diameter of coverage. All wear points or strike areas shall be
constructed of stainless steel or polyurethane for longer life.
2. The
drive armdrive arm
drive armdrive arm
drive arm shall be equipped with ball bearings at the pivot point and shall have a
replaceable drive vane. Part circle operation shall be accomplished with dual drive and reverse
drive vane. The ball bearings shall be lubricated and sealed to eliminate the need of grease
zirks and frequent maintenance. The drive spoon shall be vaned for reliable drive power. The
drive arm weight shall be adjustable to increase or decrease the drive power if desired.
3. The
lower bearinglower bearing
lower bearinglower bearing
lower bearing assembly shall be constructed with an aluminum upper housing and
bronze lower housing and shall be equipped with dual ball bearing for ease of rotation and
less wear. The bearing assembly shall be sealed and lubricated eliminating the need for grease
zirks and frequent maintenance.
4. The
braking systembraking system
braking systembraking system
braking system shall be a constant friction disc brake. It shall have pre-load brake
springs for proper rotation on uneven terrain. It shall be fully shielded to prevent contamination
from outside sources.
5. The
part circlepart circle
part circlepart circle
part circle models shall be equipped with engagement and disengagement stops that
are easily set. They shall be provided with easily accessible bolt heads or flex-handle stops as
desired.
6. The sprinkler
nozzle optionsnozzle options
nozzle optionsnozzle options
nozzle options shall be available with taper ring nozzles. All nozzle sizes shall
be interchangeable without any adjustment required on the Big Gun
®
sprinkler.
75 SERIES BIG GUN
®
SPECIFICATION
2/05
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