Class 300 Butterfly Valve

This kind of valve has a circular disk as its closing element. The standard design has the valve stem running through the disk, giving a symmetrical appearance. Later designs off-set the stem, so that the disk "cams" into the valve seat. Advantages include less wear and tear on the disk and seats, and tighter shut-off capacities. Many design types are available including inexpensive? Teflon or resilient seats for use in water(treatment) plants, etc. More expensive metal seats can be used where high temperatures or aggressive chemicals are encountered. So-called "High Temperature" butterfly valves offer zero leakage designs and have been applied in both the chemicals and hydrocarbon processing sectors.

The above attached product's specification is as following:

Standards
Flange Butterfly Valves: MSS SP-67
Water Butterfly Valves: MSS SP-68 or API 609
Face to Face Dimensions: ANSI B16.10 MSS SP-67 and MSS SP-68 or 609
Test: API598
End flange dimensions
NPS 1 1/2-24; ANSI B 16.5
NPS 30-72 MSS SP-44 or API 605
Type of construction
Flange Butterfly Valves (Hard face and soft face)
Wafer Butterfly Valves (Hard face and soft face)
Type of connection
R F and RTJ flange ends to ANSI B 16.5 or API 605 and MSS SP-44 standard.
Type of Operation
Lever
Worm Gear actuator, electric actuator, Pneumatic actuator.
Actuator Dimensions to ISO 5211 standard.