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

10. If the GPM does not agree with the specified (required) GPM, close the Triple Duty Valve accordingly. Repeat Steps
#4, #5, and #6 until the required results have been achieved.
11. Adjust pump flow so that circuits are receiving their design flow. This can be accomplished by adjusting the Triple
Duty Valve installed on the pump discharge or by changing the pump impeller size.
CAUTION: It is possible, depending on the age or condition of the stem seal, for some liquid to escape
during Triple Duty Valve adjustment. Do not have eyes or face on a level with the sides of the Triple Duty Valve.
Failure to follow this caution could result in serious personal injury.
NOTE: If the system contains a liquid with a specific gravity and/or viscosity higher or lower than that of water, apply
the appropriate correction factor noted in these instructions to obtain the actual GPM for the system liquid.
How to use Bell & Gossett model 3DV Triple Duty Valves as an isolation valve
1. Move the adjustment handle until the position indicator aligns with the CLOSED position on the calibration plate.
2. Close the isolation valve on the other side of the equipment to be serviced.
3. Drain the system between the Triple Duty Valve and the second isolation valve.
NOTICE: If a high degree of throttling of flow at pump discharge is required, Bell & Gossett recommends that
the pump impeller be sized to produce design flow. This will reduce electrical energy consumption
WARNING: Check for proper sealing when using as an isolation valve. If the seat is not sealing properly, liquid
will continue to flow from the valve. In this case, the Model 3DV Triple Duty Valve must be isolated from the
system and replaced. Failure to follow these instructions could result in serious personal injury or death and
property damage.
How to use Bell & Gossett model 3DV Triple Duty Valves for pre-set flow balancing
1. Identify the zone within a given circuit or circuit within a given system with the highest head loss.
2. Establish the value of the head loss in feet of water.
3. Establish the corresponding required GPM.
4. Select the appropriate size Triple Duty Valve (normally line size) for the required GPM.
5. Move the adjustment handle until the position indicator aligns with the OPEN position on the calibration plate.
6. Energize the zone, circuit and/or system pump(s) as applicable so that fluid is flowing through the Triple Duty Valve.
Make sure that all of the air has been directed to the compression tank (closed system) or vented to the atmosphere
(open system or closed system utilizing diaphragm or bladder tanks).
7. Using Bell & Gossett RP-250B readout probes, sequentially attach a Bell & Gossett differential pressure readout kit to
the readout valves (P/T ports) on the Triple Duty Valve.
8. Read the differential pressure across the Triple Duty Valve.
9. Refer to the appropriate Triple Duty Valve performance curve in Performance Curve Booklet B-860B or Cv rating table
to determine flow based on the results from Step #4 and valve position indicator.
CAUTION: Hot un-insulated surfaces can cause burns to the skin. Do not touch hot surfaces. Failure to follow
these instructions could result in personal injury.
WARNING: Hot water leakage can occur from readout valves (P/T ports) during probe insertion and during
hookup of readout kit. Follow the instruction manuals supplied with readout probes and readout kits for safe
use. Failure to follow these instructions could result in serious personal injury or death and property damage.