2.2.7.7
Radiator Valves
Provide angle or straightway pattern with packed or packless bonnet shutoff
globe type designed especially for steam heating system. Valve shall be
constructed of copper alloy conforming to ASTM specifications for materials
with non-metallic renewable disc and plastic wheel handle for shutoff
service.
2.2.7.8
Valve Operating Mechanism
**************************************************************************
NOTE: Show location of each floor stand,
chainwheel, or power operator required in the
project. Delete paragraph entitled "Valve Operating
Mechanism" and its subparagraphs if these items are
not required in the project.
**************************************************************************
Provide [floor stands] [chainwheels] [power operators] [and extension
stems] where indicated and as specified.
**************************************************************************
NOTE: Show floor stand details including distance
from centerline of valve to top of floor, floor
thickness, and handwheel height.
**************************************************************************
a.
Floor Stands: Shall be cast iron or steel, constructed for
bolting to the floor and shall include an extension stem, an
operating handwheel, and a position indicator for non-rising
stems. Floor stand shall be not less than 762 mm 30 inches high.
Handwheel shall identify rotation direction for closing the valve
and shall be of such diameter as to permit operation of the valve
with a force of not more than 178 Newton 40 pounds.
b.
Chainwheel Operator: Shall be fabricated of cast iron or steel
and shall include a wheel, an endless chain, and a guide to keep
the chain on the wheel. Provide galvanized steel endless chain
extending to within 914 mm 3 feet of the floor.
**************************************************************************
NOTE: Show electric or compressed air power supply
required to operate the power operators.
**************************************************************************
c.
Power Operators: Shall be [electric] [pneumatic]. Power operated
valves shall open and close at rates no slower than 254 mm 10
inches per minute for gate valves and 100 mm 4 inches per minute
for globe and angle valves. Valves shall open fully or close
tightly without requiring further attention when the actuating
control is moved to the open or close position. A predetermined
thrust exerted on the stem during operation resulting from an
obstruction in the valve shall cause the motor to automatically
stop. Power operators shall be complete with all gearing and
controls necessary for the size of valve being provided. Power
operators shall be designed to operate on the [electric]
[compressed air] power supply indicated.
SECTION 15183N
Page 17
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