991-221 Sun Hyd Calibrated Handknob Control Kit

Sun offers a fully calibrated handknob with detent lock for all series of Sun flow control cartridges. The rising stem shows the number of full turns, and 40 graduations/detents exist per full turn. The rising detented locking collar positively locks the handknob against vibration or accidental tampering. The use of this calibrated handknob allows for desired settings to be recorded and repeated. Flow control cartridges may be ordered from Sun in this configuration by specifying an H control in the model number. For Cartridge Models: FDBA, NCCB, NCCC, NCCD, NFCC, NFCD.

Technical Features

• The H control is only available for the cartridges listed below in Technical Data Section.


• Field conversion kits are not available for the Calibrated Handknob control. The kit listed below contains replacement parts for cartridges originally supplied with an H control.


• 40 graduations (and locking positions) per single revolution.


• Moveable zero indicator with minor disassembly.


• Allows for desired settings to be recorded and repeated.