1. FLOWSERVE NAF Duball DL Pocket Valve Product Presentation

2. NAF Duball DL Pocket Valve - Overview
What is the technology and what does it do?
Application based version of Duball DL high performance metal seated ball valve
Discharges solids out of process while maintaining full process pressure
Adds safety and prevents accidental through-flow which is a risk in traditional junk/sand traps
The valve is typically automated using an actuator with a stroke set to 140 degrees

3. NAF Duball DL Pocket Valve – Typical Applications
Where is it typically used?
Primarily in the Pulp and Paper Industry. Typical applications include:
Cyclone sand/junk separator (image)
Reject lines on filters
Junk traps in a repulper
Replacement of conventional multivalve junk/sand traps in any application

4. NAF Duball DL Pocket Valve – Value propositions
What can it do for customers?
Reduced process downtime as the valve allows safe removal of sand or debris during normal operation
Continous process yield due to valve which allows process pressure to be maintained while eliminating unwanted particles
Lower total cost of ownership through longer valve service life owing to robust construction and higher wear resistance of internal components

5. NAF Duball DL Pocket Ball design
Based on NAF Duball DL > Building on more than 80 years of ball valve experience in harsh environments
Specially designed “pocket” ball > Removing solids from process while maintaining full process pressure and minimized loss of process medium
Sealed and locked seats> Prevent extensive wear caused by medium build-up behind the seats
Pocket ball constructed in Solid Alloy 6> Prevents extensive wear and gives unmatched long service life
Spring loaded stem seal packing > Minimized risk for non-planned plant downtime and emissions to atmosphere
Ports for flushing> Effectively flush both the body and the ball cavity during the discharge sequence
Blowout-proof stem supported by a wear resistant anti-friction washer in Alloy 6> Provides a wear resistant, high torque transmission

6. NAF Duball DL Pocket Valve Seat Design
Sealed and locked seats> Prevent extensive wear caused by medium build-up behind the seats

7. NAF Duball DL Pocket Valve Discharge Sequence
Click to start sequence:
Filling mode
Discharge sequence starts- Body flushing begins
Final discharge position- Body- and ball flushing
Rotation back to filling position- Body flushing continues
Discharge sequence completed- Body flushing stops

8. Safety Is Our Top Priority
A traditional 2-valve based sand/junk trap:
Several thousand cubic meters of hot fluid can flow out from the pipe if both of the valves are accidentally left open at the same time.
The Duball DL Pocket Valve:
Will not allow any significant through-flow in any position. This makes it inherently less sensitive to malfunctioning than a traditional multi-valve sand/junk trap.

9. NAF Duball DL Pocket Valve - Specifications
Material: CF8M
Sizes: DN80-DN200
ANSI 3” – 8”
Pressure class: PN10-PN40
ANSI Class 150 & 300
Tightness class: Metal seats: ISO 5208 Rate D
(~ANSI FCI 70-2, Class V)
Connection: Flanges
Temperature: °C °F

10. Summary of features and benefits of NAF Duball DL Pocket Valve
Based on NAF Duball DL > Building on more than 80 years of ball valve experience in harsh environments
Specially designed “pocket” ball
> Removing solids from process while maintaining full process pressure and minimized loss of process medium
> Safe- no through-flow possible
Pocket ball constructed in Solid Alloy 6> Prevents extensive wear and gives unmatched long service life
Sealed and locked seats> Prevent extensive wear caused by medium build-up behind the seats
Ports for flushing> Effectively flush both the body and the ball cavity during the discharge sequence
Blowout-proof stem supported by a wear resistant anti-friction washer in Alloy 6> Provides a wear resistant, high torque transmission
Spring loaded stem seal packing > Minimized risk for non-planned plant downtime and emissions to atmosphere

11. Thank you for your attention