High Performance V-Ball Control Valve Series VFLO - Overview

This document provides technical specifications and component details for the VFLO Series high-performance V-Ball control valves manufactured by Petrosystem, Italy.

1. Valve Specifications

• Body Type: One-piece V-notch ball, straight-through, wafer style.
• Size Range: 0.5 inches to 18.0 inches.
• Pressure Class: Up to ANSI Class 900.
• Body Material: All castable alloy materials.
• End Connections: Flangeless, flanged (integral and separable), flanged options available.
• Bonnet Options: Standard, extended, cryogenic, and bellow sealed.
• Guiding: Heavy-duty double top stem for enhanced durability.
• Gland Packing: Options include PTFE, braided PTFE, Grafoil, and vacuum packing.
• Seat Ring: Clamped-in, self-aligned, bi-directional Fleet-Loc seat ring.
• Ball Design: Segmented V-notch ball reduces clogging and provides shearing action in fibrous fluids.
• Shaft: Splined stainless steel or 17-4PH stainless steel shaft to eliminate lost motion or dead band.
• Flow Characteristics: Equal percentage, linear, and on-off control.
• Rangeability: 300:1, allowing precise flow control.
• Actuator: Spring cylinder rotary, fully field reversible, operating with air pressure from 2.0 to 10.0 bar.
• Shut-off Class: Metal seat meets ANSI Class IV; replaceable soft seat meets ANSI Class VI.

2. Components List

The valve assembly includes numerous parts identified by item numbers and names, critical for maintenance and repair. Key components include:

• Body (Item 1)
• Ball (Item 50)
• Shaft (Item 51)
• Seat Retainer (Item 30)
• Actuator Stem (Item 211)
• Spring (Item 229)
• Yoke (Item 201)
• Various O-rings, bearings, packing sets, and seals ensuring tightness and durability.

3. Critical Features and Best Practices

• The segmented V-notch ball design is optimized to reduce clogging and improve handling of fibrous fluids through shearing action.
• Use of splined shafts ensures precise valve positioning without lost motion, enhancing control accuracy.
• Multiple bonnet and packing options allow customization for different operating environments, including cryogenic conditions.
• Rangeability of 300:1 supports fine flow adjustments, suitable for demanding process control applications.
• Compliance with ANSI shut-off classes ensures reliable sealing performance for both metal and soft seats.

4. Contact and Manufacturer Information

Manufacturer: Petrosystem
Address: Via Pietrara, 18, 00041 Albano Laziale (Rome), Italy
Phone: +39 06 79321621
Fax: +39 06 79321160
Email: [email protected]
Website: www.petrosystem.it