2.1.7.11
Butterfly Valves 2 Millimeters 2 Inches and Smaller
Valves shall be one-piece and three-piece design with male or female
threaded or soldered end connections and shall be bubble tight for shutoff
at 1034 kPa (gage) 150 psig. Stem and disc assembly shall be of 300 series
corrosion resistant steel. Disc seal assembly shall be of 300 series
corrosion resistant steel. Disc seal shall be suitable for the liquid
being used in the system in which the valve is to be installed. Valves
shall be suitable for water temperature up to 93 degrees C 200 degrees F
and shall be capable of operating at the rated pressure of [_____] kPa
(gage) psig. Valves shall be designed for throttling service use by valve
lever and indicator adjustment.
2.1.7.12
Bronze body, teflon seat, stainless steel stem and springs, automatic,
direct pressure actuated, capacities ASME certified and labelled.
2.1.7.13
Valve Operating Mechanisms
**************************************************************************
NOTE: Show location of each floor stand, chainwheel
or power operator required in the project. Delete
paragraph entitled "Valve Operating Mechanisms" 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: Construct for bolting to the floor and include an
extension stem and an operating handwheel. Design an adequately
supported and guided extension stems for connection to the valve
stem by a sleeve coupling or universal joint. Floor stands shall
be cast iron or steel. 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
N 40 pounds.
b.
Chainwheel Operator: Shall be fabricated of cast iron or steel
and shall include a wheel, endless chain and a guide to keep the
chain on the wheel. Provide galvanized steel endless chain
extending to within one meter 3 feet of the floor.
c.
Power Operators: Shall be [electric] [pneumatic]. Power operated
valves shall open and close at rates no slower than 4 mm per second
10 inches per minute for gate valves and 1.70 mm per second 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
SECTION 15185N
Page 17
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