This product series is pneumatically operated by means of a spring and a diaphragm. All models include a position indication device (open or closed). It may achieve opening times of more than 30 seconds, and closing times below 1 second. This product series may be firesafe. It may be provided as Fail to Open (relief) or as Fail to Close (Shut Off).
Diameter: from ½” up to 12” for all models.
End Connections: Screwed: NPT Female threaded (according to ASME ANSI B16.11/96); Flanged: RTJ or RF #150, #300 or #600 (according to ASME ANSI B16.5/96) Control Characteristic: Quick Opening.
Trim Type: Standard.
Body Type: Globe.
Body Material: Cast Iron (ASTM A216-WCB).
Leakage: Class VI (according to ASME ANSI B16.104/76).