Page 11 - Oil & Gas Final

Technical features
• Compliance with ASME B16.34, ISO 28921, BS 6364, ASME B16.5, ASME B16.25, API 608, API 6D.
• End to end dimensions to ASME 16.10, long pattern.
• Gear operated starting from 6” 150# - 4” 300# - 3” 600# and up.
• A variety of connections are available: flanged, screwed end, socket weld, butt weld.
• Full austenitic stainless steel body and closure ensuring excellent impact strength, minimal heat loss and protection against corrosion.
• P.T.F.E, P.C.T.F.E (Kel-F) or metal to metal seats (depending on the pressure rating and the operations required).
• SS316/316L, XM-19 or 17-4 PH stems (depending on the service).
• Extended bonnet, as a minimum according to BS6364 or ISO 28921.
• Blowout proof stem.
• Positive ball cavity relief and low operational torques. In floating ball valves this is normally achieved through a hole in the upstream side of the ball,
causing the valve to be unidirectional, but Valpres has also designed a unique floating ball valve with bi-directional seats, self cavity relief, in order to
overcome this limitation (feature available upon request).
• Low emission stem sealing systems.
• Firesafe design.
• Accurate drying, cleaning and degreasing of all parts prior to shipping.

Floating ball split body side entry (Fig. 1)
Two or three-piece construction makes it easy to assemble and install. It is versatile in application and simple
to maintain.

Floating ball top entry (Fig. 2)
The single piece forged body construction, allows access to the valve trim and makes the maintenance
operations possible while the valve is in line. Also, the risk of fugitive emission due to line bending loads is
Fig. 1
minimized with this design.

Trunnion mounted valves split body side entry (Fig. 3)
Incorporates all the main features of Valpres standard trunnion valves, such as:
• Anti blowout stem.
• Independent ball and stem.
• Antistatic device.
• Independent spring loaded seats, self cavity relief. Fig. 2
• Soft or metal to metal seats.
• Double block and bleed (if there is no requirement for pressure relief hole in the ball).
• Firesafe design.

Trunnion mounted valves top entry (Fig. 4)
Single piece cast body construction (forged body is available on smaller sizes). This design is advisable when
the valves are welded to the line, since the trim is accessible and the valve maintainable without removing it Fig. 3
from the line.

Double block and bleed – twin ball valves (Fig. 5)
This solution combines the feature of the side or top entry valves with the advantage of achieving an effective
process isolation with one single valve assembly. The other advantages are:
• Reduced overall weight.
• Reduced installation costs and related piping costs.
Fig. 4
• Leak paths minimization.

Fig. 5

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