2.13.4
Plug (PTFE Sieved Tapered Plug) Valves
API Spec 6D and MIL-V-12003 Type IV, ANSI Class 150, non-lubricated. Valve
shall have stainless steel body at plug and shall have 360 degree port
defining lips to retain the sleeve against deforming into the flow
passages, provide abrasion protection, and prevent fuel entry behind
sleeve. Plug shall operate with a 90 degree turn for closure.
2.13.5
Check Valves
ASME B16.34, ANSI Class 150, steel body, except as modified herein.
Spring-loaded, nonsurge globe type with fully guided (top and bottom) disc
with Viton renewable seats.
2.13.6
ANSI Class 150, steel body, except as modified herein.
Set relief at the
pressure indicated.
2.13.7
ASME B16.34, ANSI Class 150, steel body, except as modified herein.
2.13.8
API Std 609, minimum ANSI Class 150. Conform to fire test requirements of
API Std 607. Design for bubbletight bidirectional shutoff service at
maximum pressure rating. Steel body, except as modified herein. Stainless
steel Type 304L or 316 disc, ASTM A 276, Type 416, or ASTM A 564/A 564M,
Type 630, stainless steel stem. Teflon with metal backup seal ring. Stem
seals capable of withstanding the rated pressure and temperature of the
valve seat. Valves 200 mm 8 inches and larger and valves at pump discharge
shall have weather-proof worm-gear operators with handwheel. Install
valves between ANSI Class 150 pipe flanges. Do not install valves on other
flanges such as equipment, strainer, and valve flanges. Provide spool
pieces. Provide fusible link type valves where indicated. Provide fusible
link and spring assembly to close the valve automatically when the link
material melts at 74 degrees C 165 degrees F and to lock the valve in the
closed position. [Butterfly valves may conform to MIL-V-24624, and as
specified herein.]
2.13.9
Wafer Type Check Valves
API Spec 6D and API Std 594, ANSI Class 150. Wafer type check valves may
be provided in lieu of swing-check valves in piping sizes larger than 100 mm
4 inches. Valves shall have ASTM A 351/A 351M, Grade CF8M stainless steel
disc and seal material; 316 stainless steel spring, hinge pin, stop pin,
and radial-thrust bearing materials. Install valves between ANSI Class 150
pipe flanges.
2.13.10
ANSI Class 150, with flanged end connections, and position indicator.
Hydraulically operated, diaphragm type, modulating, globe valve actuated by
pipe line pressure through a pilot control system designed to open fast to
maintain a constant pipe line pressure but close gradually to prevent
surges; pressure fully adjustable, direct-acting, spring-loaded, diaphragm
type designed to permit flow when the controlled pressure is greater than
the predetermined spring setting; aluminum alloy 6061-T6 or 356-T6 valve
SECTION 15194N
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