Bell & Gossett V1000188B Triple Duty Valve 3DV - Manual (Page 2)

Description
Bell & Gossett Model 3DV Triple Duty Valves are precision engineered valves used in heating and cooling systems which
perform all of the functions normally required on the discharge side of hydronic pump systems.
The valve serves as a non-slam check valve as needed for zoned pumping, parallel and standby pumping, and
condenser water applications. The spring-loaded internal check valve prevents valve chatter, and assures positive
shut-off.
Bell & Gossett’s Model 3DV Triple Duty Valve has a calibrated nameplate for general system balancing. It is also
equipped with P/T readout ports for more accurate system balance capabilities. The calibrated nameplate allows the
valve to be returned to the original balanced position after shut-off. Turning the valve to the closed position provides
positive shut-off.
Installation
Model 3DV Triple Duty Valves must be installed on the discharge side of the system or zone pump with the valve facing
the direction of flow as indicated by the arrow on the valve body.
To retain calibrated accuracy, a minimum length of unrestricted straight pipe adjacent to the valve should be
maintained as follows:
Valve Temperature Max Working Pressure
Triple Duty Valve NPT -4°F (-20°C) to 250°F (120°C) 200 PSI (1379 kPa)
Size Upstream ”A”
(In pipe diameter)
Downstream ”B”
(In pipe diameter)
1/2” - 3” 5 2
Operational Limits
A B
Safety Message Level
DANGER:
WARNING:
CAUTION:
ELECTRICAL HAZARD:
NOTICE:
Indication
A hazardous situation, which if not avoided, will result in death or serious injury.
A hazardous situation, which if not avoided, will result in death or serious injury.
A hazardous situation, which if not avoided, will result in major or minor injury.
The possibility of electrical risks if instructions are not followed in a proper
manor.
• A hazardous situation, which if not avoided, will result in an indescribable
result or state.
• A practice not related to personal injury.