- 1 - 5th Edition No. SS2-8110-3300 Bubble-Tight Butterfly Control Valves (Rubber Seat) Model VBS OVERVIEW Model VBS Bubble-Tight Butterfly Control Valve has an eccentric vane and a rubber seat in its valve body section. It is advantageous for control of a large flow with low differential pressure. Among other advantageous features of this valve are that the leak flow when the valve is fully closed is very small, and that the seat can be readily replaced. SPECIFICATIONS Body Type Wafer-type, tight-closing butterfly valve Material Cast iron (FC 200), Carbon steel (SCPH 2), Stainless steel (SCS 13, 14) Nominal size 80 to 600 mm Pressure rating JIS 5K, 10K, ANSI 150 End connection Wafer type Trim Material Valve plug . Vane............. Stainless steel (SCS13 or SCS14) . Valve stem....Stainless steel (SUS304 or SUS316) . Plain metal....Bronze (BC) Stainless steel (SUS304 or SUS316 with hard chrome plating or Stellite armoring), or phenolic resin . Seat............. Natural rubber, neoprene, or viton Note) For body/trim material combinations and operating temperature ranges, refer to Table 2. Packing PTFE yarn packing Note) PTFE: Polytetrafluoroethylene Actuator Type Spring type (Direct action) or springless type (Direct or reverse action) G-O-Motor Spring range 20 to 98 kPa {0.2 to 1.0 kgf/cm2} Supply pressure . Spring type : 140 kPa {1.4 kgf/cm2} . Springless type : 200 kPa {2.0 kgf/cm2} Air connection Rc1/4 or 1/4NPT internal thread Ambient temperature 0 to +70°C Rotating angle of vane 0 to +60°C Valve action Direct or reverse action (With spring type, setting for direct action or reverse action is effected by using the key of the connecting section between the actuator and the stem. With springless type, direct action or reverse action is effected by motor rotation.) 4 5 Specifications are subject to change without notice. “This product is designed for general industrial use.”