Koso Ball Valves

210C: Concentric Segmental Ball Valves (FLOWMAX C/Wafer)

This series is concentric segmental ball valve for modulating application. V-notch cut at disc makes rangeability larger and creates shearing effect by disc and seal ring. Therefore, suitable to large rangeability service and/or control of fluids with fiber and/or slurry.

230C: Concentric Segmental Ball Valves

This series is same as 210C series except that the stem penetrates the body and is supported by double gland packing.
The stem's blow out force is set off in this construction making it suitable to heavier services such as high pressure, high temperature service because of heat expansion insulation design stem


Body type
210C 220C 230C
Body size
1"(25A) to 12"(300A) 1"(25A) to 18"(450A) 6"(150A) to 24"(600A)
Body rating
ANSI Class 150 to 600, JIS 10K to 40K JIS 10K ANSI Class 150 to 1500, JIS 20K to63K
Fluid temperature
-45 to +500° -45 to +500° -45 to +650°
Wafer type Flanged (RF) Flanged (RF, RTJ)
Body materials
SCPH2/WCB, SCS13A/CF8, SCS14A/CF8M. etc.
Disc materials
Disc treatment
Chrome plated or Stellited
Seal ring materials
R.TFE, SUS316 R.TFE, SUS304, 316
100:1 to 500:1 100:1
Flow characteristics
Approximate Eq% (Inherent Characteristic)
Metal seat
L Type seat: Rated Cv × 0.001%
H Type seat: Rated Cv × 0.25%
Soft seat
Bubbletight ANSI Class VI
Actuator combination
6300RB, 6400RB, 6500RA, 7300RA: Pneumatic Cylinder Actuator
3500RB, 3600RB: Solid State Electronic Actuator
3400RB: Electric Motor Actuator


  *Source from www.motoyama.com