This appraisal is for a range of ductile iron bodied automatic control valves.
The majority of the control valves are based on two basic diaphragm actuated globe or angle pattern valves: Hytrol Model 100-01 with a full port and Hytrol Model 100-20 with a reduced port for reduced cavitation. The booster pump control valves are based on Powertrol Model 100-02 with a full port and Powertrol Model 100-21with a reduced port for reduced cavitation.
The valves are available in sizes from DN 25 to DN 1200 with PN16, PN25 or PN35 pressure classifications and flanged or threaded ends suitable for use in drinking water and non-drinking water applications. However, it should be noted that the Scope of AS 5081 is limited to DN 900.
Various functions including remote control, pressure regulation, solenoid operation, rate of flow control, liquid level control and check valve operation are accommodated using externally plumbed hydraulic or solenoid pilot valves and other accessories.