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TRUNNION MOUNTED BALL
VALVES In trunnion mounted valves, the ball is held in a fixed axial position by
upper and lower stems (trunnions) and can move only in a rotational
mode. the resilient seats are contained in metal carriers which are spring
loaded against the ball. Line pressure applied to a close valve increases
the spring load on the upstream seat to effect a tight seal. The primary
seating is therefore on the upstream seat permitting trunnion mounted
ball valves to be used for "block and bleed" service. Newco cast steel trunnion mounted ball valves comply with the design
and testing requirements of ANSI B16.34 and API 6D. Installation
dimensions comply with ANSI B16.10. All Newco two-piece body trunnion mounted ball valves have the
following features: Full and regular port valves meet the design and test requirements of ANSI B16.34, API 6D, & federal specification WW-V-35, Type II, style 3. *Parkerizing is a zinc Phosphate Surface conversion and a Registered Trademark
of The Parker Co. The information contained herein is general in nature and is not intended for specific construction or application purposes.
Newco Valves reserves the right to make changes in specifications, designs or materials at any time without notice or
obligation. *Teflon and Viton are registered trademark of DuPont company.
TWO-PIECE BODY
DESIGN FEATURES
Ball valves are straight-through flow valves which provide positive
shutoff with minimal pressure drop and flow turbulence. The barrier to
flow is a ball which is rotated 90 degrees to the direction of flow. Because the stem motion from full open to full closed is a 90 degree
rotation, ball valves are ideally suited for automatic operation.
Flange dimensions are in accordance with ANSI B16.5.
Full port valves have installation dimensions in accordance with the long pattern dimensions of ANSI B16.10 and API 6D.
Regular port valves have installation dimensions in accordance with the short pattern dimensions of ANSI B16.10 and API 6D.
MATERIALS
STANDARD MATERIALS
Part
No.Part Name Body Material Carbon Steel 316 Stainless 1 Body ASTM
A216-WCB-Parkerized* ASTM A351-CF8M 2 Body Cap ASTM
A216-WCB-Parkerized* ASTM A351-CF8M 3 Ball A276-316 or A351-CF8M A276-316 or A 4 Stem A276-316 A276-316 5 Seat RPTFE RPTFE 6 Seat box A283 CR Plated AISI 316 7 Seat retainer A283 CR Plated AISI 316 8 Trunnion A276-316 A276-316 9 Flat spring A6150 - Parkerized* AISI 316 10 O ring NBR Viton 11 Bearing 316/PTFE 316/PTFE 12 Bottom flange AISI 1020 AISI 316 13 Stem retainer A216-WCB - Parkerized* A351 14 Seal retainer A216-WCB - Parkerized* A351 15 Stem ring AISI 316 AISI 316 16 Bearing 316/PTFE 316/PTFE 17 Body studs A193-87 CR Plated A193-8 18 Stud nuts A194-24 CR Plated A194-8 19 Key AISI 1020 316/PTFE 
OPTIONAL MATERIALS Body/Body Cap:
ASTM A352-LCB - Low - Temperature Carbon Steel
Stem/Ball/Trunnion:
ASTM A182-F304 - 304 stainlessSeats:
Virgin Teflon*
Carbon Reinforced Teflon
Viton*
Seals:
Teflon
Nitrile
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Atlantic Valve and Supply Company
3541 9th Street, Baltimore, Maryland 21225
Phone: 410-355-8270 - Fax: 410-355-7860
Email: sales@atlanticvalve.com