Page 12 - Oil & Gas Final

ROTARY CONTROL FLOATING

AND TRUNNION BALL VALVES

The VP1-L trim (for liquids) offers enhanced management of
moderate and severe cavitation while the VP1-G trim (for gas and
steam) offers greatly reduced noise levels. These standard trims
are able to manage the process even under difficult conditions and
severe service. Furthermore, the same basic geometry is used with
both liquids and gases allowing product standardization. The principle
of curved plates (Fig. 1-3) provides excellent throttling performance
in terms of FL, sigma and XT coefficients without sacrificing the
maximum capacity of the valve. Also the minimum flow rates have
been carefully evaluated by technicians and engineers to ensure the
best rangeability. The Valpres trims are designed to be installed both
on floating and trunnion ball valves. Valpres control valves can be
designed full or reduced bore according to process conditions.

Fig. 1 Fig. 2 Fig. 3
Technical features
VP1 valves are sized according to IEC 60534 and ISA75 international sizing equations. Customized calculations and CFD can be
adopted for special applications. Valve sizing is performed with latest generation VALPSIZE™ 2.0 sizing tool.
• Noise is evaluated according to customized IEC and VDMA equations.
• Venturi outlet closures can be adopted to better control velocity profiles in steam/gas applications.
• Valve body construction and flanges can be manufactured according to customer specifications. Floating and trunnion control ball
valves replicate the standard features that are implemented in the on-off valves.
• Materials: solid metal alloys can be adopted as well as weld overlays in Corrosion Resistant Alloys (CRA).
• Metal to metal seal contact is available as a standard solution, leakage rate Class V. Soft seated valves are for clean fluids and
tight shut off applications.
• Special plates design and high peak frequencies allow standard noise reduction up to 20dB(A) thanks to velocity control (Fig. 6).
• Liquid Recovery Factor up to 0.96 thanks to special plates design and multiple pressure drop stage (Fig. 7-8).
• Real rangeability up to 200:1 with standard trim. Customized trim can be adopted to
increase the rangeability to 300:1 and above.
• Resistors can be installed to increase valve performance. When required 30Db(A)
noise reduction can be reached with combined solutions.
• High Inherent Cv value (i.e. VP1-L 4” with Cv=500 vs globe valve 4” with Cv=160-200:
this implies that an 8” globe valve is required to compare the capacity) (Fig. 9).
• VP1 valves are intrinsically self-cleaning trim and they are suitable to handle 2-phase
fluids, pulp, flashing liquids and dirty fluids.
• Cryogenic and high temperature design is available.
• VP2 design is available for special and very severe applications. Fig. 4
• Valves are also available with a V-shaped ball in the following standard design (Fig.
10). Customized V-shape balls are available upon request to better respond to the
required process conditions. Various type of liquids, gases and steam can be controlled
by these valves. Soft seats are standard. Metal to metal seats are available for high
temperatures and dirty or slurry conditions.

Fig. 5

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