Globe Valves and Angle Valves

the following:

(1) Sizes 65 mm 2-1/2 inches and less, bronze:

MSS SP-80, Type 1

or 2, Class 300 minimum.

(2) Sizes 80 mm 3 inches through 610 mm 24 inches, steel:

ASME

B16.34, Class 300 minimum, flanged ends.

2.19.7.3

Globe Valves and Angle Valves

Globe type valves shall have outside screw and yoke with bolted bonnets,

stainless steel trim, and flat seats, but shall not be the reversed cup

type. The stuffing boxes shall be large and deep. Valves shall be

installed with the stem horizontal or above. A distribution system bypass

motor-operated globe-valved piping connection between the supply and return

mains, where required, shall be installed to ensure uninterrupted water

flow to the HTW generator in case of low return pressure. In operation,

valve shall modulate to the open position on low return main pressure

signal. A three position selector switch shall be provided for automatic

or manual selection of valve position. For each distribution zone, a

manually-operated handwheel or chainwheel globe valve shall be installed in

each high temperature return main to control the flow and the resultant

differential temperature drop through each system.

a.

Valves for Class 125 125 pound class steel piping shall conform to

the following:

(1) Sizes 65 mm 2-1/2 inches and less, bronze:

MSS SP-80, Type

1, 2, or 3, Class 125.

(2) Sizes 80 mm 3 inches through 300 mm 12 inches, cast-iron:

MSS SP-85, Type III and Type IV, Class 125.

b.

Valves for Class 150 150 pound class steel piping shall conform to

the following:

(1) Sizes 65 mm 2-1/2 inches and less, bronze:

MSS SP-80, Type

1, 2, or 3, Class 150 minimum.

(2) Sizes 80 mm 3 inches through 610 mm 24 inches, steel:

ASME

B16.34, Class 150 minimum, flanged ends.

c.

Valves for Class 300 300 pound class steel piping shall conform to

the following:

(1) Sizes 65 mm 2-1/2 inches and less, bronze:

MSS SP-80, Type

1, 2, or 3, Class 300 minimum.

(2) Sizes 80 mm 3 inches through 610 mm 24 inches, steel:

ASME

B16.34, Class 300 minimum, flanged ends.

2.19.7.4

Thermostatic Regulating Valve

a.

Cooling Water Control Valves: A thermostatically-operated flow

control valve shall be installed in the cooling water piping from

each HTW circulating pump, each air compressor, and each

aftercooler to control the flow of the cooling water

automatically, to prevent the waste of water, and provide proper

operating temperature for the bearings. The valve shall match the

SECTION 15555A

Page 62