A plug valve is a quarter-turn manual valve that uses a cylindrical or tapered plug to permit or prevent straight through flow through the body. The plug has a straight through full port opening. Plug valve can be used in on-off, basic moderate throttling, and diverting services.
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Standard Specification for plug valve
General
Plug valves shall be of the non-lubricating, eccentric type and shall be designed for a working
pressure of 175 psi for valves 12” and smaller, 150 psi for valves 14” and larger. Valves shall provide
tight shut-off at rated pressure. Valve shall be the Pratt Ballcentric Plug Valve as manufactured by the
Henry Pratt Company.
Valves 12” and smaller shall have round port design. 14” and larger valves shall have rectangular port
design.
Valve Body
The plug valve body shall be cast iron ASTM A126 Class B with welded-in overlay of at least 95%
nickel alloy content on all surfaces contacting the face of the plug. Sprayed, plated, nickel welded
rings or seats screwed into the body are not acceptable.
Valve Plug
The valve plug shall be ductile iron ASTM A-536, Grade 65-45-12, in valve sizes up to 20”, and
ASTM A126 Class B cast iron in sizes 24” and larger, with Buna N resilient seating surface to mate
with the body seat.
Valve Flanges
Valve flanges shall be in strict accordance with ANSI B16.1, Class 125.
Valve Bearings
Plug valve shall be furnished with permanently lubricated sleeve type bearings conforming to AWWA
C517. Bearings shall be of sintered, oil impregnated type 316 stainless steel ASTM A-743 Grade CF8M or bronze ASTM B-127.
Valve Shaft Seals
Valves shaft seals shall be of the “U” cup type, in accordance with AWWA C517. Seals shall be self adjusting and re-packable without moving the bonnet from the valve.
Valve Actuators
6” and smaller exposed valves shall be provided with wrench actuators. 8” and larger exposed valves
shall be provided with worm gear type manual actuators. All buried valves shall be provided with
worm and gear actuators suited for the intended service. Valve actuators shall be fully grease packed
and have stops in the open/close position. The actuator shall have a mechanical stop which will
withstand an input torque of 450 lbs. against the stop. The actuator shall be able to provide 1.25
times the required operating torque under full rated line pressure combined with a flow velocity of 8
feet per second.