s.6441 NPT


1/2″ – 4″ brass trim, ISO 5211

More and more automation is required at all levels in our society and the s.64 RuB range is the answer to all needs for reliable actuated ball valve.

It features special seat design to automatically compensate for wear and it has successfully passed 100,000 cycle* life tests.

You can purchase the valve alone or with the RuB actuator already mounted.

*All sizes up to 2″ included

Technical Data
  • 24h 100% seal test guaranteed
  • Dual sealing system allows valve to be operated in either direction making installation easier
  • No metal-to-metal moving parts
  • No maintenance ever required
  • Silicone-free lubricant on all seals
  • Chrome plated brass ball for longer life
  • Hot forged sand blasted, unplated brass body and cap sealed with Loctite® or equivalent thread sealant
  • Integrated ISO 5211 and DIN 3337 mounting flange for universal connection to actuator
  • Finest brass according to EN 12165 and EN 12164 specifications
  • Blowout-proof nickel plated brass stem
  • Maintenance-free, double FPM O-rings at the stem for maximum safety
  • Reinforced PTFE self-lubricating seats with flexible-lip and wear compensation design
  • NPT taper ANSI B.1.20.1 female by female threads

  • 100% full port for maximum flow
  • Integrated sturdy ISO 5211 flange allows direct mounting of electric and pneumatic actuators, with no bracket or coupling required.
    See RuB line of electric and pneumatic actuators.
Working pressure & temperature
  • 600 PSI up to 2″, 450 PSI over 2″ non-shock cold working pressure
  • -4°F to +350°F
  • WARNING: freezing of the fluid in the installation may severely damage the valve
  • S.64 configuration featuring EN 10226-1, ISO 228 parallel female by female threads, plated body and brass trim
  • Stainless steel trim (s.6439)
  • Configuration for use with slurries or liquid bearing abrasive particles
  • Rack and pinion pneumatic actuator (spring return or double acting)
  • Compact power electric actuator for some sizes
  • Manual lockable handle
Upon request
  • Custom design
Approved by or in compliance with
  • Water Regulations Advisory Scheme (United Kingdom)
  • GOST-R (Russia)
  • RoHS Compliant (EU)


NOTE: approvals apply to specific configurations/sizes only.

Valves configuration up to 2″

Part descriptionQ.tyMaterial
1Unplated body1CW617N
2Ball seat2PTFE graphite filled 15%
3Chrome plated ball1CW617N
4Unplated end-cap1CW617N
5Washer1PTFE carbon filled 25%
6Nickel plated stem O-ring design1CW617N
9Black anodized flange (only from 2.1/2" to 4")1Aluminum
10Grub screw (only from 2.1/2" to 4")2CB4FF (EN10263-2)

Valve ball seats and stem configuration of valves over 2″ is different.

Torque for actuator sizing in-lb
s.6441 NPT brass trim
Torque correction factors

Valve torque can vary according to operating frequency, temperature and friction characteristics of the media.
If media has more or less friction than water, multiply torque by the following factors.

Lubricating oils or liquids 0.8
Dry gases, natural gas 1.5
Slurries or liquids bearing abrasive particles 1.5÷2.5


Pressure-temperature chart
Pressure drop chart
Ask for additional information on the whole range of RuB products and consult with your supplier for special applications.
XCES6441 - 4266