Valve Series

Series 310
V-Notch Ball Valves

The V–Notch Ball Valve gives non-clogging, high capacity, straight through flow control of fluids containing pulp and paper stock or slurries and fluids containing suspended solids or fibrous materials.

The V- Notch Ball Valves are offered squared and clamped driven shaft plus ball shaft with splined connection designed for zero lost motion for highly accurate positioning and precise control.


Design Code BS 5351
Valve Size 25 to 200 mm (1” to 8”)
Rating ANSI 150 and 300
End Connection Flanged
F/F Dimensions ANSI B-16.10
Flow Characteristic Approx. Equal Percent, Linear, On-Off
Body Material Carbon steel, Stainless steel
Ball Material Stainless Steel
Seat Ring PTFE, Carbon Filled Teflon
Ball Ring CF8M, Alloy Steels
Gasket PTFE, Graphite Laminate
Gland Packing PTFE Chevrons, Graphite, Low emission
Actuator Form Diaphragm, Piston or Electric
Actuator Type Rotary
Diaphragm Nitrile / Neoprene (nylon reinforced)
Spring Range 3 – 15 Psig (0.2 – 1.0 Kg/cm2) 6 – 30 Psig (0.4 – 2.0 Kg/cm2)
Air supply 20 – 35 Psig (1.4 – 2.5 Kg/cm2)
Air Connection 1/ 4” or 1/ 2” NPT
Accessories Valve Positioners - Pneumatic, Electro-Pneumatic, Smart
Instruments - Airset, Solenoid Valve, Volume Booster, Airlock, Limit Switches
Features Top or Side Mounted handwheel, Limit Stops Removable Blind Head, Steam Jacketing etc

Design Features

  • Shearing effect between the ball and seal ensures tight shut-off, even on fibrous slurries.
  • The unrestricted, straight through flow design provides high capacity and wide rangeability.
  • Precise contouring of the V-notch balls provides a nearly equal percentage characteristic.
  • Replaceable ball seal and back up ring for added rigidity.
  • Ball machined to a super smooth finish, hard-chrome plated and polished to increase ball seal life.
  • High CV to body size ratio.


Recent Clients

Contact Us

For more information on any of our products and services, please call:

+44 (0) 1274 531992

You can email:

or visit:
Valve Solutions Ltd, Unit 10,
Acorn Business Park, Baildon
Shipley BD17 7SW